--- OA_place: repository OA_type: green _id: '20764' abstract: - lang: eng text: Hydrocyanation reactions enable access to synthetically valuable nitriles from readily available alkene precursors. However, hydrocyanation reactions using hydrogen cyanide (HCN) or similarly toxic reagents on laboratory scale can be particularly challenging due to their hazardous nature. In addition, such processes typically require air- and temperature-sensitive Ni(0) precatalysts, further reducing the operational simplicity of this transformation. Herein, we report a HCN-free transfer hydrocyanation of alkenes and alkynes that employs commercially available aliphatic nitriles as sacrificial HCN donors in combination with a catalytic amount of air-stable and inexpensive NiCl2 as a precatalyst and a cocatalytic Lewis acid. The scalability and robustness of the catalytic process were demonstrated by the hydrocyanation of α-methylstyrene on a 100 mmol scale (11.4 g of product obtained) using 1 mol % of the Ni catalyst. In addition, the feasibility of the dehydrocyanation protocol using the air-stable Ni(II) precatalyst and norbornadiene as a sacrificial acceptor was showcased by the selective conversion of an aliphatic nitrile into the corresponding alkene. article_processing_charge: No article_type: original author: - first_name: Julia full_name: Reisenbauer, Julia id: 51d862e9-36ee-11f0-86d3-8534c85a5496 last_name: Reisenbauer - first_name: Benjamin N. full_name: Bhawal, Benjamin N. last_name: Bhawal - first_name: Nicola full_name: Jelmini, Nicola last_name: Jelmini - first_name: Bill full_name: Morandi, Bill last_name: Morandi citation: ama: Reisenbauer J, Bhawal BN, Jelmini N, Morandi B. Development of an operationally simple, scalable, and HCN-free transfer hydrocyanation protocol using an air-stable nickel precatalyst. Organic Process Research & Development. 2022;26(4):1165-1173. doi:10.1021/acs.oprd.1c00442 apa: Reisenbauer, J., Bhawal, B. N., Jelmini, N., & Morandi, B. (2022). Development of an operationally simple, scalable, and HCN-free transfer hydrocyanation protocol using an air-stable nickel precatalyst. Organic Process Research & Development. American Chemical Society. https://doi.org/10.1021/acs.oprd.1c00442 chicago: Reisenbauer, Julia, Benjamin N. Bhawal, Nicola Jelmini, and Bill Morandi. “Development of an Operationally Simple, Scalable, and HCN-Free Transfer Hydrocyanation Protocol Using an Air-Stable Nickel Precatalyst.” Organic Process Research & Development. American Chemical Society, 2022. https://doi.org/10.1021/acs.oprd.1c00442. ieee: J. Reisenbauer, B. N. Bhawal, N. Jelmini, and B. Morandi, “Development of an operationally simple, scalable, and HCN-free transfer hydrocyanation protocol using an air-stable nickel precatalyst,” Organic Process Research & Development, vol. 26, no. 4. American Chemical Society, pp. 1165–1173, 2022. ista: Reisenbauer J, Bhawal BN, Jelmini N, Morandi B. 2022. Development of an operationally simple, scalable, and HCN-free transfer hydrocyanation protocol using an air-stable nickel precatalyst. Organic Process Research & Development. 26(4), 1165–1173. mla: Reisenbauer, Julia, et al. “Development of an Operationally Simple, Scalable, and HCN-Free Transfer Hydrocyanation Protocol Using an Air-Stable Nickel Precatalyst.” Organic Process Research & Development, vol. 26, no. 4, American Chemical Society, 2022, pp. 1165–73, doi:10.1021/acs.oprd.1c00442. short: J. Reisenbauer, B.N. Bhawal, N. Jelmini, B. Morandi, Organic Process Research & Development 26 (2022) 1165–1173. date_created: 2025-12-09T14:24:58Z date_published: 2022-02-15T00:00:00Z date_updated: 2025-12-16T12:02:59Z day: '15' doi: 10.1021/acs.oprd.1c00442 extern: '1' intvolume: ' 26' issue: '4' language: - iso: eng main_file_link: - open_access: '1' url: https://www.research-collection.ethz.ch/entities/publication/4ed5123f-eb11-4a4d-b06c-f50edcec38b8 month: '02' oa: 1 oa_version: Submitted Version page: 1165-1173 publication: Organic Process Research & Development publication_identifier: eissn: - 1520-586X issn: - 1083-6160 publication_status: published publisher: American Chemical Society quality_controlled: '1' scopus_import: '1' status: public title: Development of an operationally simple, scalable, and HCN-free transfer hydrocyanation protocol using an air-stable nickel precatalyst type: journal_article user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87 volume: 26 year: '2022' ... --- OA_place: publisher OA_type: gold _id: '18876' abstract: - lang: eng text: Convolutional neural networks were the standard for solving many computer vision tasks until recently, when Transformers of MLP-based architectures have started to show competitive performance. These architectures typically have a vast number of weights and need to be trained on massive datasets; hence, they are not suitable for their use in low-data regimes. In this work, we propose a simple yet effective framework to improve generalization from small amounts of data. We augment modern CNNs with fully-connected (FC) layers and show the massive impact this architectural change has in low-data regimes. We further present an online joint knowledge-distillation method to utilize the extra FC layers at train time but avoid them during test time. This allows us to improve the generalization of a CNN-based model without any increase in the number of weights at test time. We perform classification experiments for a large range of network backbones and several standard datasets on supervised learning and active learning. Our experiments significantly outperform the networks without fully-connected layers, reaching a relative improvement of up to 16% validation accuracy in the supervised setting without adding any extra parameters during inference. acknowledgement: "This work was supported by a Sofja Kovalevskaja Award, a postdoc fellowship\r\nfrom the Humboldt Foundation, the ERC Starting Grant Scan2CAD (804724), and the German\r\nResearch Foundation (DFG) Research Unit \"Learning and Simulation in Visual Computing\"." alternative_title: - Advances in Neural Information Processing Systems article_processing_charge: No arxiv: 1 author: - first_name: Peter full_name: Kocsis, Peter last_name: Kocsis - first_name: Peter full_name: Súkeník, Peter id: d64d6a8d-eb8e-11eb-b029-96fd216dec3c last_name: Súkeník - first_name: Guillem full_name: Brasó, Guillem last_name: Brasó - first_name: Matthias full_name: Niessner, Matthias last_name: Niessner - first_name: Laura full_name: Leal-Taixé, Laura last_name: Leal-Taixé - first_name: Ismail full_name: Elezi, Ismail last_name: Elezi citation: ama: 'Kocsis P, Súkeník P, Brasó G, Niessner M, Leal-Taixé L, Elezi I. The unreasonable effectiveness of fully-connected layers for low-data regimes. In: 36th Conference on Neural Information Processing Systems. Vol 35. Neural Information Processing Systems Foundation; 2022:1896-1908.' apa: 'Kocsis, P., Súkeník, P., Brasó, G., Niessner, M., Leal-Taixé, L., & Elezi, I. (2022). The unreasonable effectiveness of fully-connected layers for low-data regimes. In 36th Conference on Neural Information Processing Systems (Vol. 35, pp. 1896–1908). New Orleans, LA, United States: Neural Information Processing Systems Foundation.' chicago: Kocsis, Peter, Peter Súkeník, Guillem Brasó, Matthias Niessner, Laura Leal-Taixé, and Ismail Elezi. “The Unreasonable Effectiveness of Fully-Connected Layers for Low-Data Regimes.” In 36th Conference on Neural Information Processing Systems, 35:1896–1908. Neural Information Processing Systems Foundation, 2022. ieee: P. Kocsis, P. Súkeník, G. Brasó, M. Niessner, L. Leal-Taixé, and I. Elezi, “The unreasonable effectiveness of fully-connected layers for low-data regimes,” in 36th Conference on Neural Information Processing Systems, New Orleans, LA, United States, 2022, vol. 35, pp. 1896–1908. ista: 'Kocsis P, Súkeník P, Brasó G, Niessner M, Leal-Taixé L, Elezi I. 2022. The unreasonable effectiveness of fully-connected layers for low-data regimes. 36th Conference on Neural Information Processing Systems. NeurIPS: Neural Information Processing Systems, Advances in Neural Information Processing Systems, vol. 35, 1896–1908.' mla: Kocsis, Peter, et al. “The Unreasonable Effectiveness of Fully-Connected Layers for Low-Data Regimes.” 36th Conference on Neural Information Processing Systems, vol. 35, Neural Information Processing Systems Foundation, 2022, pp. 1896–908. short: P. Kocsis, P. Súkeník, G. Brasó, M. Niessner, L. Leal-Taixé, I. Elezi, in:, 36th Conference on Neural Information Processing Systems, Neural Information Processing Systems Foundation, 2022, pp. 1896–1908. conference: end_date: 2022-12-09 location: New Orleans, LA, United States name: 'NeurIPS: Neural Information Processing Systems' start_date: 2022-11-28 date_created: 2025-01-24T19:16:01Z date_published: 2022-12-01T00:00:00Z date_updated: 2025-07-10T11:51:28Z day: '01' ddc: - '000' extern: '1' external_id: arxiv: - '2210.05657' file: - access_level: open_access checksum: 2a14e59ef8b34d9a1a27a7adbc6f83ff content_type: application/pdf creator: psukenik date_created: 2025-01-24T19:13:32Z date_updated: 2025-01-24T19:13:32Z file_id: '18877' file_name: NeurIPS-2022-the-unreasonable-effectiveness-of-fully-connected-layers-for-low-data-regimes-Paper-Conference.pdf file_size: 444819 relation: main_file success: 1 file_date_updated: 2025-01-24T19:13:32Z has_accepted_license: '1' intvolume: ' 35' language: - iso: eng month: '12' oa: 1 oa_version: Published Version page: 1896-1908 publication: 36th Conference on Neural Information Processing Systems publication_identifier: issn: - 1049-5258 publication_status: published publisher: Neural Information Processing Systems Foundation quality_controlled: '1' scopus_import: '1' status: public title: The unreasonable effectiveness of fully-connected layers for low-data regimes type: conference user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87 volume: 35 year: '2022' ... --- OA_place: repository OA_type: green _id: '19490' abstract: - lang: eng text: "Abstract. We study integral points on the quadratic twists ED : y2 = x3 −\r\nD2x of the congruent number curve. We give upper bounds on the number of\r\nintegral points in each coset of 2ED(Q) in ED(Q) and show that their total is\r\n (3.8)rank ED(Q). We further show that the average number of non-torsion\r\nintegral points in this family is bounded above by 2. As an application we also\r\ndeduce from our upper bounds that the system of simultaneous Pell equations\r\naX2 − bY 2 = d, bY 2 − cZ2 = d for pairwise coprime positive integers a, b, c, d,\r\nhas at most (3.6)ω(abcd) integer solutions." article_processing_charge: No article_type: original arxiv: 1 author: - first_name: Yik Tung full_name: Chan, Yik Tung id: c4c0afc8-9262-11ed-9231-d8b0bc743af1 last_name: Chan orcid: 0000-0001-8467-4106 citation: ama: Chan S. Integral points on the congruent number curve. Transactions of the American Mathematical Society. 2022;375(9):6675-6700. doi:10.1090/tran/8732 apa: Chan, S. (2022). Integral points on the congruent number curve. Transactions of the American Mathematical Society. American Mathematical Society. https://doi.org/10.1090/tran/8732 chicago: Chan, Stephanie. “Integral Points on the Congruent Number Curve.” Transactions of the American Mathematical Society. American Mathematical Society, 2022. https://doi.org/10.1090/tran/8732. ieee: S. Chan, “Integral points on the congruent number curve,” Transactions of the American Mathematical Society, vol. 375, no. 9. American Mathematical Society, pp. 6675–6700, 2022. ista: Chan S. 2022. Integral points on the congruent number curve. Transactions of the American Mathematical Society. 375(9), 6675–6700. mla: Chan, Stephanie. “Integral Points on the Congruent Number Curve.” Transactions of the American Mathematical Society, vol. 375, no. 9, American Mathematical Society, 2022, pp. 6675–700, doi:10.1090/tran/8732. short: S. Chan, Transactions of the American Mathematical Society 375 (2022) 6675–6700. date_created: 2025-04-05T10:50:56Z date_published: 2022-09-01T00:00:00Z date_updated: 2025-07-10T11:51:47Z day: '01' doi: 10.1090/tran/8732 extern: '1' external_id: arxiv: - '2004.03331' intvolume: ' 375' issue: '9' language: - iso: eng main_file_link: - open_access: '1' url: https://doi.org/10.48550/arXiv.2004.03331 month: '09' oa: 1 oa_version: Preprint page: 6675-6700 publication: Transactions of the American Mathematical Society publication_identifier: eissn: - 1088-6850 issn: - 0002-9947 publication_status: published publisher: American Mathematical Society quality_controlled: '1' scopus_import: '1' status: public title: Integral points on the congruent number curve type: journal_article user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87 volume: 375 year: '2022' ... --- DOAJ_listed: '1' OA_place: publisher OA_type: gold _id: '19491' abstract: - lang: eng text: Using a recent breakthrough of Smith [18], we improve the results of Fouvry and Klüners [4, 5] on the solubility of the negative Pell equation. Let D denote the set of positive squarefree integers having no prime factors congruent to 3 modulo 4 . Stevenhagen [19] conjectured that the density of d in D such that the negative Pell equation x2−dy2=−1 is solvable with x,y∈Z is 58.1% , to the nearest tenth of a percent. By studying the distribution of the 8 -rank of narrow class groups Cl+(d) of Q(√d) , we prove that the infimum of this density is at least 53.8% . article_number: e46 article_processing_charge: Yes article_type: original arxiv: 1 author: - first_name: Yik Tung full_name: Chan, Yik Tung id: c4c0afc8-9262-11ed-9231-d8b0bc743af1 last_name: Chan orcid: 0000-0001-8467-4106 - first_name: Peter full_name: Koymans, Peter last_name: Koymans - first_name: Djordjo full_name: Milovic, Djordjo last_name: Milovic - first_name: Carlo full_name: Pagano, Carlo last_name: Pagano citation: ama: Chan S, Koymans P, Milovic D, Pagano C. The 8-rank of the narrow class group and the negative Pell equation. Forum of Mathematics, Sigma. 2022;10. doi:10.1017/fms.2022.40 apa: Chan, S., Koymans, P., Milovic, D., & Pagano, C. (2022). The 8-rank of the narrow class group and the negative Pell equation. Forum of Mathematics, Sigma. Cambridge University Press. https://doi.org/10.1017/fms.2022.40 chicago: Chan, Stephanie, Peter Koymans, Djordjo Milovic, and Carlo Pagano. “The 8-Rank of the Narrow Class Group and the Negative Pell Equation.” Forum of Mathematics, Sigma. Cambridge University Press, 2022. https://doi.org/10.1017/fms.2022.40. ieee: S. Chan, P. Koymans, D. Milovic, and C. Pagano, “The 8-rank of the narrow class group and the negative Pell equation,” Forum of Mathematics, Sigma, vol. 10. Cambridge University Press, 2022. ista: Chan S, Koymans P, Milovic D, Pagano C. 2022. The 8-rank of the narrow class group and the negative Pell equation. Forum of Mathematics, Sigma. 10, e46. mla: Chan, Stephanie, et al. “The 8-Rank of the Narrow Class Group and the Negative Pell Equation.” Forum of Mathematics, Sigma, vol. 10, e46, Cambridge University Press, 2022, doi:10.1017/fms.2022.40. short: S. Chan, P. Koymans, D. Milovic, C. Pagano, Forum of Mathematics, Sigma 10 (2022). date_created: 2025-04-05T10:51:00Z date_published: 2022-05-17T00:00:00Z date_updated: 2025-07-10T11:51:47Z day: '17' ddc: - '510' doi: 10.1017/fms.2022.40 extern: '1' external_id: arxiv: - '1908.01752' has_accepted_license: '1' intvolume: ' 10' language: - iso: eng main_file_link: - open_access: '1' url: https://doi.org/10.1017/fms.2022.40 month: '05' oa: 1 oa_version: Published Version publication: Forum of Mathematics, Sigma publication_identifier: issn: - 2050-5094 publication_status: published publisher: Cambridge University Press quality_controlled: '1' scopus_import: '1' status: public title: The 8-rank of the narrow class group and the negative Pell equation tmp: image: /images/cc_by.png legal_code_url: https://creativecommons.org/licenses/by/4.0/legalcode name: Creative Commons Attribution 4.0 International Public License (CC-BY 4.0) short: CC BY (4.0) type: journal_article user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87 volume: 10 year: '2022' ... --- _id: '15131' abstract: - lang: eng text: RNA modifications are widespread in biology and abundant in ribosomal RNA. However, the importance of these modifications is not well understood. We show that methylation of a single nucleotide, in the catalytic center of the large subunit, gates ribosome assembly. Massively parallel mutational scanning of the essential nuclear GTPase Nog2 identified important interactions with rRNA, particularly with the 2′-O-methylated A-site base Gm2922. We found that methylation of G2922 is needed for assembly and efficient nuclear export of the large subunit. Critically, we identified single amino acid changes in Nog2 that completely bypass dependence on G2922 methylation and used cryoelectron microscopy to directly visualize how methylation flips Gm2922 into the active site channel of Nog2. This work demonstrates that a single RNA modification is a critical checkpoint in ribosome biogenesis, suggesting that such modifications can play an important role in regulation and assembly of macromolecular machines. article_processing_charge: Yes (in subscription journal) article_type: original author: - first_name: James N. full_name: Yelland, James N. last_name: Yelland - first_name: Jack Peter Kelly full_name: Bravo, Jack Peter Kelly id: 96aecfa5-8931-11ee-af30-aa6a5d6eee0e last_name: Bravo orcid: 0000-0003-0456-0753 - first_name: Joshua J. full_name: Black, Joshua J. last_name: Black - first_name: David W. full_name: Taylor, David W. last_name: Taylor - first_name: Arlen W. full_name: Johnson, Arlen W. last_name: Johnson citation: ama: Yelland JN, Bravo JPK, Black JJ, Taylor DW, Johnson AW. A single 2′-O-methylation of ribosomal RNA gates assembly of a functional ribosome. Nature Structural & Molecular Biology. 2022;30:91-98. doi:10.1038/s41594-022-00891-8 apa: Yelland, J. N., Bravo, J. P. K., Black, J. J., Taylor, D. W., & Johnson, A. W. (2022). A single 2′-O-methylation of ribosomal RNA gates assembly of a functional ribosome. Nature Structural & Molecular Biology. Springer Nature. https://doi.org/10.1038/s41594-022-00891-8 chicago: Yelland, James N., Jack Peter Kelly Bravo, Joshua J. Black, David W. Taylor, and Arlen W. Johnson. “A Single 2′-O-Methylation of Ribosomal RNA Gates Assembly of a Functional Ribosome.” Nature Structural & Molecular Biology. Springer Nature, 2022. https://doi.org/10.1038/s41594-022-00891-8. ieee: J. N. Yelland, J. P. K. Bravo, J. J. Black, D. W. Taylor, and A. W. Johnson, “A single 2′-O-methylation of ribosomal RNA gates assembly of a functional ribosome,” Nature Structural & Molecular Biology, vol. 30. Springer Nature, pp. 91–98, 2022. ista: Yelland JN, Bravo JPK, Black JJ, Taylor DW, Johnson AW. 2022. A single 2′-O-methylation of ribosomal RNA gates assembly of a functional ribosome. Nature Structural & Molecular Biology. 30, 91–98. mla: Yelland, James N., et al. “A Single 2′-O-Methylation of Ribosomal RNA Gates Assembly of a Functional Ribosome.” Nature Structural & Molecular Biology, vol. 30, Springer Nature, 2022, pp. 91–98, doi:10.1038/s41594-022-00891-8. short: J.N. Yelland, J.P.K. Bravo, J.J. Black, D.W. Taylor, A.W. Johnson, Nature Structural & Molecular Biology 30 (2022) 91–98. date_created: 2024-03-20T10:41:45Z date_published: 2022-12-19T00:00:00Z date_updated: 2024-06-04T06:27:09Z day: '19' doi: 10.1038/s41594-022-00891-8 extern: '1' external_id: pmid: - '36536102' intvolume: ' 30' keyword: - Molecular Biology - Structural Biology language: - iso: eng main_file_link: - open_access: '1' url: https://doi.org/10.1038/s41594-022-00891-8 month: '12' oa: 1 oa_version: Published Version page: 91-98 pmid: 1 publication: Nature Structural & Molecular Biology publication_identifier: eissn: - 1545-9985 issn: - 1545-9993 publication_status: published publisher: Springer Nature quality_controlled: '1' scopus_import: '1' status: public title: A single 2′-O-methylation of ribosomal RNA gates assembly of a functional ribosome type: journal_article user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87 volume: 30 year: '2022' ... --- _id: '15132' abstract: - lang: eng text: Clustered regularly interspaced short palindromic repeats - CRISPR-associated protein (CRISPR-Cas) systems are a critical component of the bacterial adaptive immune response. Since the discovery that they can be reengineered as programmable RNA-guided nucleases, there has been significant interest in using these systems to perform diverse and precise genetic manipulations. Here, we outline recent advances in the mechanistic understanding of CRISPR-Cas9, how these findings have been leveraged in the rational redesign of Cas9 variants with altered activities, and how these novel tools can be exploited for biotechnology and therapeutics. We also discuss the potential of the ubiquitous, yet often-overlooked, multisubunit CRISPR effector complexes for large-scale genomic deletions. Furthermore, we highlight how future structural studies will bolster these technologies. article_number: '102839' article_processing_charge: No article_type: review author: - first_name: Jack Peter Kelly full_name: Bravo, Jack Peter Kelly id: 96aecfa5-8931-11ee-af30-aa6a5d6eee0e last_name: Bravo orcid: 0000-0003-0456-0753 - first_name: Grace N full_name: Hibshman, Grace N last_name: Hibshman - first_name: David W full_name: Taylor, David W last_name: Taylor citation: ama: Bravo JPK, Hibshman GN, Taylor DW. Constructing next-generation CRISPR–Cas tools from structural blueprints. Current Opinion in Biotechnology. 2022;78. doi:10.1016/j.copbio.2022.102839 apa: Bravo, J. P. K., Hibshman, G. N., & Taylor, D. W. (2022). Constructing next-generation CRISPR–Cas tools from structural blueprints. Current Opinion in Biotechnology. Elsevier. https://doi.org/10.1016/j.copbio.2022.102839 chicago: Bravo, Jack Peter Kelly, Grace N Hibshman, and David W Taylor. “Constructing Next-Generation CRISPR–Cas Tools from Structural Blueprints.” Current Opinion in Biotechnology. Elsevier, 2022. https://doi.org/10.1016/j.copbio.2022.102839. ieee: J. P. K. Bravo, G. N. Hibshman, and D. W. Taylor, “Constructing next-generation CRISPR–Cas tools from structural blueprints,” Current Opinion in Biotechnology, vol. 78. Elsevier, 2022. ista: Bravo JPK, Hibshman GN, Taylor DW. 2022. Constructing next-generation CRISPR–Cas tools from structural blueprints. Current Opinion in Biotechnology. 78, 102839. mla: Bravo, Jack Peter Kelly, et al. “Constructing Next-Generation CRISPR–Cas Tools from Structural Blueprints.” Current Opinion in Biotechnology, vol. 78, 102839, Elsevier, 2022, doi:10.1016/j.copbio.2022.102839. short: J.P.K. Bravo, G.N. Hibshman, D.W. Taylor, Current Opinion in Biotechnology 78 (2022). date_created: 2024-03-20T10:41:53Z date_published: 2022-12-01T00:00:00Z date_updated: 2024-10-14T12:34:11Z day: '01' doi: 10.1016/j.copbio.2022.102839 extern: '1' external_id: pmid: - '36371895' intvolume: ' 78' keyword: - Biomedical Engineering - Bioengineering - Biotechnology language: - iso: eng month: '12' oa_version: None pmid: 1 publication: Current Opinion in Biotechnology publication_identifier: issn: - 0958-1669 publication_status: published publisher: Elsevier quality_controlled: '1' scopus_import: '1' status: public title: Constructing next-generation CRISPR–Cas tools from structural blueprints type: journal_article user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87 volume: 78 year: '2022' ... --- _id: '15133' abstract: - lang: eng text: In the evolutionary arms race against phage, bacteria have assembled a diverse arsenal of antiviral immune strategies. While the recently discovered DISARM (Defense Island System Associated with Restriction-Modification) systems can provide protection against a wide range of phage, the molecular mechanisms that underpin broad antiviral targeting but avoiding autoimmunity remain enigmatic. Here, we report cryo-EM structures of the core DISARM complex, DrmAB, both alone and in complex with an unmethylated phage DNA mimetic. These structures reveal that DrmAB core complex is autoinhibited by a trigger loop (TL) within DrmA and binding to DNA substrates containing a 5′ overhang dislodges the TL, initiating a long-range structural rearrangement for DrmAB activation. Together with structure-guided in vivo studies, our work provides insights into the mechanism of phage DNA recognition and specific activation of this widespread antiviral defense system. article_number: '2987' article_processing_charge: Yes article_type: original author: - first_name: Jack Peter Kelly full_name: Bravo, Jack Peter Kelly id: 96aecfa5-8931-11ee-af30-aa6a5d6eee0e last_name: Bravo orcid: 0000-0003-0456-0753 - first_name: Cristian full_name: Aparicio-Maldonado, Cristian last_name: Aparicio-Maldonado - first_name: Franklin L. full_name: Nobrega, Franklin L. last_name: Nobrega - first_name: Stan J. J. full_name: Brouns, Stan J. J. last_name: Brouns - first_name: David W. full_name: Taylor, David W. last_name: Taylor citation: ama: Bravo JPK, Aparicio-Maldonado C, Nobrega FL, Brouns SJJ, Taylor DW. Structural basis for broad anti-phage immunity by DISARM. Nature Communications. 2022;13. doi:10.1038/s41467-022-30673-1 apa: Bravo, J. P. K., Aparicio-Maldonado, C., Nobrega, F. L., Brouns, S. J. J., & Taylor, D. W. (2022). Structural basis for broad anti-phage immunity by DISARM. Nature Communications. Springer Nature. https://doi.org/10.1038/s41467-022-30673-1 chicago: Bravo, Jack Peter Kelly, Cristian Aparicio-Maldonado, Franklin L. Nobrega, Stan J. J. Brouns, and David W. Taylor. “Structural Basis for Broad Anti-Phage Immunity by DISARM.” Nature Communications. Springer Nature, 2022. https://doi.org/10.1038/s41467-022-30673-1. ieee: J. P. K. Bravo, C. Aparicio-Maldonado, F. L. Nobrega, S. J. J. Brouns, and D. W. Taylor, “Structural basis for broad anti-phage immunity by DISARM,” Nature Communications, vol. 13. Springer Nature, 2022. ista: Bravo JPK, Aparicio-Maldonado C, Nobrega FL, Brouns SJJ, Taylor DW. 2022. Structural basis for broad anti-phage immunity by DISARM. Nature Communications. 13, 2987. mla: Bravo, Jack Peter Kelly, et al. “Structural Basis for Broad Anti-Phage Immunity by DISARM.” Nature Communications, vol. 13, 2987, Springer Nature, 2022, doi:10.1038/s41467-022-30673-1. short: J.P.K. Bravo, C. Aparicio-Maldonado, F.L. Nobrega, S.J.J. Brouns, D.W. Taylor, Nature Communications 13 (2022). date_created: 2024-03-20T10:41:59Z date_published: 2022-05-27T00:00:00Z date_updated: 2024-06-04T06:16:38Z day: '27' doi: 10.1038/s41467-022-30673-1 extern: '1' external_id: pmid: - '35624106' intvolume: ' 13' keyword: - General Physics and Astronomy - General Biochemistry - Genetics and Molecular Biology - General Chemistry - Multidisciplinary language: - iso: eng main_file_link: - open_access: '1' url: https://doi.org/10.1038/s41467-022-30673-1 month: '05' oa: 1 oa_version: Published Version pmid: 1 publication: Nature Communications publication_identifier: issn: - 2041-1723 publication_status: published publisher: Springer Nature quality_controlled: '1' scopus_import: '1' status: public title: Structural basis for broad anti-phage immunity by DISARM type: journal_article user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87 volume: 13 year: '2022' ... --- _id: '15134' abstract: - lang: eng text: CRISPR-Cas systems are adaptive immune systems that protect prokaryotes from foreign nucleic acids, such as bacteriophages. Two of the most prevalent CRISPR-Cas systems include type I and type III. Interestingly, the type I-D interference proteins contain characteristic features of both type I and type III systems. Here, we present the structures of type I-D Cascade bound to both a double-stranded (ds)DNA and a single-stranded (ss)RNA target at 2.9 and 3.1 Å, respectively. We show that type I-D Cascade is capable of specifically binding ssRNA and reveal how PAM recognition of dsDNA targets initiates long-range structural rearrangements that likely primes Cas10d for Cas3′ binding and subsequent non-target strand DNA cleavage. These structures allow us to model how binding of the anti-CRISPR protein AcrID1 likely blocks target dsDNA binding via competitive inhibition of the DNA substrate engagement with the Cas10d active site. This work elucidates the unique mechanisms used by type I-D Cascade for discrimination of single-stranded and double stranded targets. Thus, our data supports a model for the hybrid nature of this complex with features of type III and type I systems. article_number: '2829' article_processing_charge: Yes article_type: original author: - first_name: Evan A. full_name: Schwartz, Evan A. last_name: Schwartz - first_name: Tess M. full_name: McBride, Tess M. last_name: McBride - first_name: Jack Peter Kelly full_name: Bravo, Jack Peter Kelly id: 96aecfa5-8931-11ee-af30-aa6a5d6eee0e last_name: Bravo orcid: 0000-0003-0456-0753 - first_name: Daniel full_name: Wrapp, Daniel last_name: Wrapp - first_name: Peter C. full_name: Fineran, Peter C. last_name: Fineran - first_name: Robert D. full_name: Fagerlund, Robert D. last_name: Fagerlund - first_name: David W. full_name: Taylor, David W. last_name: Taylor citation: ama: Schwartz EA, McBride TM, Bravo JPK, et al. Structural rearrangements allow nucleic acid discrimination by type I-D Cascade. Nature Communications. 2022;13. doi:10.1038/s41467-022-30402-8 apa: Schwartz, E. A., McBride, T. M., Bravo, J. P. K., Wrapp, D., Fineran, P. C., Fagerlund, R. D., & Taylor, D. W. (2022). Structural rearrangements allow nucleic acid discrimination by type I-D Cascade. Nature Communications. Springer Nature. https://doi.org/10.1038/s41467-022-30402-8 chicago: Schwartz, Evan A., Tess M. McBride, Jack Peter Kelly Bravo, Daniel Wrapp, Peter C. Fineran, Robert D. Fagerlund, and David W. Taylor. “Structural Rearrangements Allow Nucleic Acid Discrimination by Type I-D Cascade.” Nature Communications. Springer Nature, 2022. https://doi.org/10.1038/s41467-022-30402-8. ieee: E. A. Schwartz et al., “Structural rearrangements allow nucleic acid discrimination by type I-D Cascade,” Nature Communications, vol. 13. Springer Nature, 2022. ista: Schwartz EA, McBride TM, Bravo JPK, Wrapp D, Fineran PC, Fagerlund RD, Taylor DW. 2022. Structural rearrangements allow nucleic acid discrimination by type I-D Cascade. Nature Communications. 13, 2829. mla: Schwartz, Evan A., et al. “Structural Rearrangements Allow Nucleic Acid Discrimination by Type I-D Cascade.” Nature Communications, vol. 13, 2829, Springer Nature, 2022, doi:10.1038/s41467-022-30402-8. short: E.A. Schwartz, T.M. McBride, J.P.K. Bravo, D. Wrapp, P.C. Fineran, R.D. Fagerlund, D.W. Taylor, Nature Communications 13 (2022). date_created: 2024-03-20T10:42:05Z date_published: 2022-05-20T00:00:00Z date_updated: 2024-06-04T06:14:28Z day: '20' doi: 10.1038/s41467-022-30402-8 extern: '1' external_id: pmid: - '35595728' intvolume: ' 13' keyword: - General Physics and Astronomy - General Biochemistry - Genetics and Molecular Biology - General Chemistry - Multidisciplinary language: - iso: eng main_file_link: - open_access: '1' url: https://doi.org/10.1038/s41467-022-30402-8 month: '05' oa: 1 oa_version: Published Version pmid: 1 publication: Nature Communications publication_identifier: issn: - 2041-1723 publication_status: published publisher: Springer Nature quality_controlled: '1' scopus_import: '1' status: public title: Structural rearrangements allow nucleic acid discrimination by type I-D Cascade type: journal_article user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87 volume: 13 year: '2022' ... --- _id: '15136' abstract: - lang: eng text: CRISPR–Cas9 as a programmable genome editing tool is hindered by off-target DNA cleavage1,2,3,4, and the underlying mechanisms by which Cas9 recognizes mismatches are poorly understood5,6,7. Although Cas9 variants with greater discrimination against mismatches have been designed8,9,10, these suffer from substantially reduced rates of on-target DNA cleavage5,11. Here we used kinetics-guided cryo-electron microscopy to determine the structure of Cas9 at different stages of mismatch cleavage. We observed a distinct, linear conformation of the guide RNA–DNA duplex formed in the presence of mismatches, which prevents Cas9 activation. Although the canonical kinked guide RNA–DNA duplex conformation facilitates DNA cleavage, we observe that substrates that contain mismatches distal to the protospacer adjacent motif are stabilized by reorganization of a loop in the RuvC domain. Mutagenesis of mismatch-stabilizing residues reduces off-target DNA cleavage but maintains rapid on-target DNA cleavage. By targeting regions that are exclusively involved in mismatch tolerance, we provide a proof of concept for the design of next-generation high-fidelity Cas9 variants. article_processing_charge: Yes (in subscription journal) article_type: original author: - first_name: Jack Peter Kelly full_name: Bravo, Jack Peter Kelly id: 96aecfa5-8931-11ee-af30-aa6a5d6eee0e last_name: Bravo orcid: 0000-0003-0456-0753 - first_name: Mu-Sen full_name: Liu, Mu-Sen last_name: Liu - first_name: Grace N. full_name: Hibshman, Grace N. last_name: Hibshman - first_name: Tyler L. full_name: Dangerfield, Tyler L. last_name: Dangerfield - first_name: Kyungseok full_name: Jung, Kyungseok last_name: Jung - first_name: Ryan S. full_name: McCool, Ryan S. last_name: McCool - first_name: Kenneth A. full_name: Johnson, Kenneth A. last_name: Johnson - first_name: David W. full_name: Taylor, David W. last_name: Taylor citation: ama: Bravo JPK, Liu M-S, Hibshman GN, et al. Structural basis for mismatch surveillance by CRISPR–Cas9. Nature. 2022;603(7900):343-347. doi:10.1038/s41586-022-04470-1 apa: Bravo, J. P. K., Liu, M.-S., Hibshman, G. N., Dangerfield, T. L., Jung, K., McCool, R. S., … Taylor, D. W. (2022). Structural basis for mismatch surveillance by CRISPR–Cas9. Nature. Springer Nature. https://doi.org/10.1038/s41586-022-04470-1 chicago: Bravo, Jack Peter Kelly, Mu-Sen Liu, Grace N. Hibshman, Tyler L. Dangerfield, Kyungseok Jung, Ryan S. McCool, Kenneth A. Johnson, and David W. Taylor. “Structural Basis for Mismatch Surveillance by CRISPR–Cas9.” Nature. Springer Nature, 2022. https://doi.org/10.1038/s41586-022-04470-1. ieee: J. P. K. Bravo et al., “Structural basis for mismatch surveillance by CRISPR–Cas9,” Nature, vol. 603, no. 7900. Springer Nature, pp. 343–347, 2022. ista: Bravo JPK, Liu M-S, Hibshman GN, Dangerfield TL, Jung K, McCool RS, Johnson KA, Taylor DW. 2022. Structural basis for mismatch surveillance by CRISPR–Cas9. Nature. 603(7900), 343–347. mla: Bravo, Jack Peter Kelly, et al. “Structural Basis for Mismatch Surveillance by CRISPR–Cas9.” Nature, vol. 603, no. 7900, Springer Nature, 2022, pp. 343–47, doi:10.1038/s41586-022-04470-1. short: J.P.K. Bravo, M.-S. Liu, G.N. Hibshman, T.L. Dangerfield, K. Jung, R.S. McCool, K.A. Johnson, D.W. Taylor, Nature 603 (2022) 343–347. date_created: 2024-03-20T10:42:21Z date_published: 2022-03-02T00:00:00Z date_updated: 2024-06-04T06:36:59Z day: '02' doi: 10.1038/s41586-022-04470-1 extern: '1' external_id: pmid: - '35236982' intvolume: ' 603' issue: '7900' language: - iso: eng main_file_link: - open_access: '1' url: https://doi.org/10.1038/s41586-022-04470-1 month: '03' oa: 1 oa_version: Published Version page: 343-347 pmid: 1 publication: Nature publication_identifier: eissn: - 1476-4687 issn: - 0028-0836 publication_status: published publisher: Springer Nature quality_controlled: '1' related_material: link: - relation: erratum url: https://doi.org/10.1038/s41586-022-04655-8 scopus_import: '1' status: public title: Structural basis for mismatch surveillance by CRISPR–Cas9 type: journal_article user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87 volume: 603 year: '2022' ... --- _id: '15144' article_processing_charge: No article_type: letter_note author: - first_name: Jack Peter Kelly full_name: Bravo, Jack Peter Kelly id: 96aecfa5-8931-11ee-af30-aa6a5d6eee0e last_name: Bravo orcid: 0000-0003-0456-0753 citation: ama: Bravo JPK. SuperFi-Cas9 exceeds fidelity, matches speed of original Cas9. Genetic Engineering & Biotechnology News. 2022;42(4):12. doi:10.1089/gen.42.04.03 apa: Bravo, J. P. K. (2022). SuperFi-Cas9 exceeds fidelity, matches speed of original Cas9. Genetic Engineering & Biotechnology News. Mary Ann Liebert. https://doi.org/10.1089/gen.42.04.03 chicago: Bravo, Jack Peter Kelly. “SuperFi-Cas9 Exceeds Fidelity, Matches Speed of Original Cas9.” Genetic Engineering & Biotechnology News. Mary Ann Liebert, 2022. https://doi.org/10.1089/gen.42.04.03. ieee: J. P. K. Bravo, “SuperFi-Cas9 exceeds fidelity, matches speed of original Cas9,” Genetic Engineering & Biotechnology News, vol. 42, no. 4. Mary Ann Liebert, p. 12, 2022. ista: Bravo JPK. 2022. SuperFi-Cas9 exceeds fidelity, matches speed of original Cas9. Genetic Engineering & Biotechnology News. 42(4), 12. mla: Bravo, Jack Peter Kelly. “SuperFi-Cas9 Exceeds Fidelity, Matches Speed of Original Cas9.” Genetic Engineering & Biotechnology News, vol. 42, no. 4, Mary Ann Liebert, 2022, p. 12, doi:10.1089/gen.42.04.03. short: J.P.K. Bravo, Genetic Engineering & Biotechnology News 42 (2022) 12. date_created: 2024-03-20T10:43:19Z date_published: 2022-04-01T00:00:00Z date_updated: 2024-10-14T12:32:14Z day: '01' doi: 10.1089/gen.42.04.03 extern: '1' intvolume: ' 42' issue: '4' keyword: - Management of Technology and Innovation - Biomedical Engineering - Bioengineering - Biotechnology language: - iso: eng month: '04' oa_version: None page: '12' publication: Genetic Engineering & Biotechnology News publication_identifier: eissn: - 1937-8661 issn: - 1935-472X publication_status: published publisher: Mary Ann Liebert quality_controlled: '1' scopus_import: '1' status: public title: SuperFi-Cas9 exceeds fidelity, matches speed of original Cas9 type: journal_article user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87 volume: 42 year: '2022' ... --- _id: '15203' abstract: - lang: eng text: The first X-ray pulsar, Cen X-3, was discovered 50 yr ago. Radiation from such objects is expected to be highly polarized due to birefringence of plasma and vacuum associated with propagation of photons in the presence of the strong magnetic field. Here we present results of the observations of Cen X-3 performed with the Imaging X-ray Polarimetry Explorer. The source exhibited significant flux variability and was observed in two states different by a factor of ∼20 in flux. In the low-luminosity state, no significant polarization was found in either pulse phase-averaged (with a 3σ upper limit of 12%) or phase-resolved (the 3σ upper limits are 20%–30%) data. In the bright state, the polarization degree of 5.8% ± 0.3% and polarization angle of 49fdg6 ± 1fdg5 with a significance of about 20σ were measured from the spectropolarimetric analysis of the phase-averaged data. The phase-resolved analysis showed a significant anticorrelation between the flux and the polarization degree, as well as strong variations of the polarization angle. The fit with the rotating vector model indicates a position angle of the pulsar spin axis of about 49° and a magnetic obliquity of 17°. The detected relatively low polarization can be explained if the upper layers of the neutron star surface are overheated by the accreted matter and the conversion of the polarization modes occurs within the transition region between the upper hot layer and a cooler underlying atmosphere. A fraction of polarization signal can also be produced by reflection of radiation from the neutron star surface and the accretion curtain. article_number: L14 article_processing_charge: No article_type: original arxiv: 1 author: - first_name: Sergey S. full_name: Tsygankov, Sergey S. last_name: Tsygankov - first_name: Victor full_name: Doroshenko, Victor last_name: Doroshenko - first_name: Juri full_name: Poutanen, Juri last_name: Poutanen - first_name: Jeremy full_name: Heyl, Jeremy last_name: Heyl - first_name: Alexander A. full_name: Mushtukov, Alexander A. last_name: Mushtukov - first_name: Ilaria full_name: Caiazzo, Ilaria id: 8ae5b6e7-2a03-11ee-914d-b58ed7a3b47d last_name: Caiazzo orcid: 0000-0002-4770-5388 - first_name: Alessandro full_name: Di Marco, Alessandro last_name: Di Marco - first_name: Sofia V. full_name: Forsblom, Sofia V. last_name: Forsblom - first_name: Denis full_name: González-Caniulef, Denis last_name: González-Caniulef - first_name: Moritz full_name: Klawin, Moritz last_name: Klawin - first_name: Fabio full_name: La Monaca, Fabio last_name: La Monaca - first_name: Christian full_name: Malacaria, Christian last_name: Malacaria - first_name: Herman L. full_name: Marshall, Herman L. last_name: Marshall - first_name: Fabio full_name: Muleri, Fabio last_name: Muleri - first_name: Mason full_name: Ng, Mason last_name: Ng - first_name: Valery F. full_name: Suleimanov, Valery F. last_name: Suleimanov - first_name: Rashid A. full_name: Sunyaev, Rashid A. last_name: Sunyaev - first_name: Roberto full_name: Turolla, Roberto last_name: Turolla - first_name: Iván full_name: Agudo, Iván last_name: Agudo - first_name: Lucio A. full_name: Antonelli, Lucio A. last_name: Antonelli - first_name: Matteo full_name: Bachetti, Matteo last_name: Bachetti - first_name: Luca full_name: Baldini, Luca last_name: Baldini - first_name: Wayne H. full_name: Baumgartner, Wayne H. last_name: Baumgartner - first_name: Ronaldo full_name: Bellazzini, Ronaldo last_name: Bellazzini - first_name: Stefano full_name: Bianchi, Stefano last_name: Bianchi - first_name: Stephen D. full_name: Bongiorno, Stephen D. last_name: Bongiorno - first_name: Raffaella full_name: Bonino, Raffaella last_name: Bonino - first_name: Alessandro full_name: Brez, Alessandro last_name: Brez - first_name: Niccolò full_name: Bucciantini, Niccolò last_name: Bucciantini - first_name: Fiamma full_name: Capitanio, Fiamma last_name: Capitanio - first_name: Simone full_name: Castellano, Simone last_name: Castellano - first_name: Elisabetta full_name: Cavazzuti, Elisabetta last_name: Cavazzuti - first_name: Stefano full_name: Ciprini, Stefano last_name: Ciprini - first_name: Enrico full_name: Costa, Enrico last_name: Costa - first_name: Alessandra De full_name: Rosa, Alessandra De last_name: Rosa - first_name: Ettore full_name: Del Monte, Ettore last_name: Del Monte - first_name: Laura Di full_name: Gesu, Laura Di last_name: Gesu - first_name: Niccolò Di full_name: Lalla, Niccolò Di last_name: Lalla - first_name: Immacolata full_name: Donnarumma, Immacolata last_name: Donnarumma - first_name: Michal full_name: Dovčiak, Michal last_name: Dovčiak - first_name: Steven R. full_name: Ehlert, Steven R. last_name: Ehlert - first_name: Teruaki full_name: Enoto, Teruaki last_name: Enoto - first_name: Yuri full_name: Evangelista, Yuri last_name: Evangelista - first_name: Sergio full_name: Fabiani, Sergio last_name: Fabiani - first_name: Riccardo full_name: Ferrazzoli, Riccardo last_name: Ferrazzoli - first_name: Javier A. full_name: Garcia, Javier A. last_name: Garcia - first_name: Shuichi full_name: Gunji, Shuichi last_name: Gunji - first_name: Kiyoshi full_name: Hayashida, Kiyoshi last_name: Hayashida - first_name: Wataru full_name: Iwakiri, Wataru last_name: Iwakiri - first_name: Svetlana G. full_name: Jorstad, Svetlana G. last_name: Jorstad - first_name: Vladimir full_name: Karas, Vladimir last_name: Karas - first_name: Takao full_name: Kitaguchi, Takao last_name: Kitaguchi - first_name: Jeffery J. full_name: Kolodziejczak, Jeffery J. last_name: Kolodziejczak - first_name: Henric full_name: Krawczynski, Henric last_name: Krawczynski - first_name: Luca full_name: Latronico, Luca last_name: Latronico - first_name: Ioannis full_name: Liodakis, Ioannis last_name: Liodakis - first_name: Simone full_name: Maldera, Simone last_name: Maldera - first_name: Alberto full_name: Manfreda, Alberto last_name: Manfreda - first_name: Frédéric full_name: Marin, Frédéric last_name: Marin - first_name: Andrea full_name: Marinucci, Andrea last_name: Marinucci - first_name: Alan P. full_name: Marscher, Alan P. last_name: Marscher - first_name: Giorgio full_name: Matt, Giorgio last_name: Matt - first_name: Ikuyuki full_name: Mitsuishi, Ikuyuki last_name: Mitsuishi - first_name: Tsunefumi full_name: Mizuno, Tsunefumi last_name: Mizuno - first_name: Chi-Yung full_name: Ng, Chi-Yung last_name: Ng - first_name: Stephen L. full_name: O’Dell, Stephen L. last_name: O’Dell - first_name: Nicola full_name: Omodei, Nicola last_name: Omodei - first_name: Chiara full_name: Oppedisano, Chiara last_name: Oppedisano - first_name: Alessandro full_name: Papitto, Alessandro last_name: Papitto - first_name: George G. full_name: Pavlov, George G. last_name: Pavlov - first_name: Abel L. full_name: Peirson, Abel L. last_name: Peirson - first_name: Matteo full_name: Perri, Matteo last_name: Perri - first_name: Melissa full_name: Pesce-Rollins, Melissa last_name: Pesce-Rollins - first_name: Pierre-Olivier full_name: Petrucci, Pierre-Olivier last_name: Petrucci - first_name: Maura full_name: Pilia, Maura last_name: Pilia - first_name: Andrea full_name: Possenti, Andrea last_name: Possenti - first_name: Simonetta full_name: Puccetti, Simonetta last_name: Puccetti - first_name: Brian D. full_name: Ramsey, Brian D. last_name: Ramsey - first_name: John full_name: Rankin, John last_name: Rankin - first_name: Ajay full_name: Ratheesh, Ajay last_name: Ratheesh - first_name: Roger W. full_name: Romani, Roger W. last_name: Romani - first_name: Carmelo full_name: Sgrò, Carmelo last_name: Sgrò - first_name: Patrick full_name: Slane, Patrick last_name: Slane - first_name: Paolo full_name: Soffitta, Paolo last_name: Soffitta - first_name: Gloria full_name: Spandre, Gloria last_name: Spandre - first_name: Toru full_name: Tamagawa, Toru last_name: Tamagawa - first_name: Fabrizio full_name: Tavecchio, Fabrizio last_name: Tavecchio - first_name: Roberto full_name: Taverna, Roberto last_name: Taverna - first_name: Yuzuru full_name: Tawara, Yuzuru last_name: Tawara - first_name: Allyn F. full_name: Tennant, Allyn F. last_name: Tennant - first_name: Nicholas E. full_name: Thomas, Nicholas E. last_name: Thomas - first_name: Francesco full_name: Tombesi, Francesco last_name: Tombesi - first_name: Alessio full_name: Trois, Alessio last_name: Trois - first_name: Jacco full_name: Vink, Jacco last_name: Vink - first_name: Martin C. full_name: Weisskopf, Martin C. last_name: Weisskopf - first_name: Kinwah full_name: Wu, Kinwah last_name: Wu - first_name: Fei full_name: Xie, Fei last_name: Xie - first_name: Silvia full_name: Zane, Silvia last_name: Zane citation: ama: Tsygankov SS, Doroshenko V, Poutanen J, et al. The x-ray polarimetry view of the accreting pulsar Cen X-3. The Astrophysical Journal Letters. 2022;941(1). doi:10.3847/2041-8213/aca486 apa: Tsygankov, S. S., Doroshenko, V., Poutanen, J., Heyl, J., Mushtukov, A. A., Caiazzo, I., … Zane, S. (2022). The x-ray polarimetry view of the accreting pulsar Cen X-3. The Astrophysical Journal Letters. American Astronomical Society. https://doi.org/10.3847/2041-8213/aca486 chicago: Tsygankov, Sergey S., Victor Doroshenko, Juri Poutanen, Jeremy Heyl, Alexander A. Mushtukov, Ilaria Caiazzo, Alessandro Di Marco, et al. “The X-Ray Polarimetry View of the Accreting Pulsar Cen X-3.” The Astrophysical Journal Letters. American Astronomical Society, 2022. https://doi.org/10.3847/2041-8213/aca486. ieee: S. S. Tsygankov et al., “The x-ray polarimetry view of the accreting pulsar Cen X-3,” The Astrophysical Journal Letters, vol. 941, no. 1. American Astronomical Society, 2022. ista: Tsygankov SS, Doroshenko V, Poutanen J, Heyl J, Mushtukov AA, Caiazzo I, Di Marco A, Forsblom SV, González-Caniulef D, Klawin M, La Monaca F, Malacaria C, Marshall HL, Muleri F, Ng M, Suleimanov VF, Sunyaev RA, Turolla R, Agudo I, Antonelli LA, Bachetti M, Baldini L, Baumgartner WH, Bellazzini R, Bianchi S, Bongiorno SD, Bonino R, Brez A, Bucciantini N, Capitanio F, Castellano S, Cavazzuti E, Ciprini S, Costa E, Rosa AD, Del Monte E, Gesu LD, Lalla ND, Donnarumma I, Dovčiak M, Ehlert SR, Enoto T, Evangelista Y, Fabiani S, Ferrazzoli R, Garcia JA, Gunji S, Hayashida K, Iwakiri W, Jorstad SG, Karas V, Kitaguchi T, Kolodziejczak JJ, Krawczynski H, Latronico L, Liodakis I, Maldera S, Manfreda A, Marin F, Marinucci A, Marscher AP, Matt G, Mitsuishi I, Mizuno T, Ng C-Y, O’Dell SL, Omodei N, Oppedisano C, Papitto A, Pavlov GG, Peirson AL, Perri M, Pesce-Rollins M, Petrucci P-O, Pilia M, Possenti A, Puccetti S, Ramsey BD, Rankin J, Ratheesh A, Romani RW, Sgrò C, Slane P, Soffitta P, Spandre G, Tamagawa T, Tavecchio F, Taverna R, Tawara Y, Tennant AF, Thomas NE, Tombesi F, Trois A, Vink J, Weisskopf MC, Wu K, Xie F, Zane S. 2022. The x-ray polarimetry view of the accreting pulsar Cen X-3. The Astrophysical Journal Letters. 941(1), L14. mla: Tsygankov, Sergey S., et al. “The X-Ray Polarimetry View of the Accreting Pulsar Cen X-3.” The Astrophysical Journal Letters, vol. 941, no. 1, L14, American Astronomical Society, 2022, doi:10.3847/2041-8213/aca486. short: S.S. Tsygankov, V. Doroshenko, J. Poutanen, J. Heyl, A.A. Mushtukov, I. Caiazzo, A. Di Marco, S.V. Forsblom, D. González-Caniulef, M. Klawin, F. La Monaca, C. Malacaria, H.L. Marshall, F. Muleri, M. Ng, V.F. Suleimanov, R.A. Sunyaev, R. Turolla, I. Agudo, L.A. Antonelli, M. Bachetti, L. Baldini, W.H. Baumgartner, R. Bellazzini, S. Bianchi, S.D. Bongiorno, R. Bonino, A. Brez, N. Bucciantini, F. Capitanio, S. Castellano, E. Cavazzuti, S. Ciprini, E. Costa, A.D. Rosa, E. Del Monte, L.D. Gesu, N.D. Lalla, I. Donnarumma, M. Dovčiak, S.R. Ehlert, T. Enoto, Y. Evangelista, S. Fabiani, R. Ferrazzoli, J.A. Garcia, S. Gunji, K. Hayashida, W. Iwakiri, S.G. Jorstad, V. Karas, T. Kitaguchi, J.J. Kolodziejczak, H. Krawczynski, L. Latronico, I. Liodakis, S. Maldera, A. Manfreda, F. Marin, A. Marinucci, A.P. Marscher, G. Matt, I. Mitsuishi, T. Mizuno, C.-Y. Ng, S.L. O’Dell, N. Omodei, C. Oppedisano, A. Papitto, G.G. Pavlov, A.L. Peirson, M. Perri, M. Pesce-Rollins, P.-O. Petrucci, M. Pilia, A. Possenti, S. Puccetti, B.D. Ramsey, J. Rankin, A. Ratheesh, R.W. Romani, C. Sgrò, P. Slane, P. Soffitta, G. Spandre, T. Tamagawa, F. Tavecchio, R. Taverna, Y. Tawara, A.F. Tennant, N.E. Thomas, F. Tombesi, A. Trois, J. Vink, M.C. Weisskopf, K. Wu, F. Xie, S. Zane, The Astrophysical Journal Letters 941 (2022). date_created: 2024-03-26T09:50:38Z date_published: 2022-12-12T00:00:00Z date_updated: 2024-04-02T07:16:18Z day: '12' doi: 10.3847/2041-8213/aca486 extern: '1' external_id: arxiv: - '2209.02447' intvolume: ' 941' issue: '1' keyword: - Space and Planetary Science - Astronomy and Astrophysics language: - iso: eng main_file_link: - open_access: '1' url: https://doi.org/10.3847/2041-8213/aca486 month: '12' oa: 1 oa_version: Published Version publication: The Astrophysical Journal Letters publication_identifier: eissn: - 2041-8213 issn: - 2041-8205 publication_status: published publisher: American Astronomical Society quality_controlled: '1' scopus_import: '1' status: public title: The x-ray polarimetry view of the accreting pulsar Cen X-3 tmp: image: /images/cc_by.png legal_code_url: https://creativecommons.org/licenses/by/4.0/legalcode name: Creative Commons Attribution 4.0 International Public License (CC-BY 4.0) short: CC BY (4.0) type: journal_article user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87 volume: 941 year: '2022' ... --- _id: '15204' abstract: - lang: eng text: Using observations of X-ray pulsar Hercules X-1 by the Imaging X-ray Polarimetry Explorer we report a highly significant (>17σ) detection of the polarization signal from an accreting neutron star. The observed degree of linear polarization of ~10% is far below theoretical expectations for this object, and stays low throughout the spin cycle of the pulsar. Both the degree and angle of polarization exhibit variability with the pulse phase, allowing us to measure the pulsar spin position angle 57(2) deg and the magnetic obliquity 12(4) deg, which is an essential step towards detailed modelling of the intrinsic emission of X-ray pulsars. Combining our results with the optical polarimetric data, we find that the spin axis of the neutron star and the angular momentum of the binary orbit are misaligned by at least ~20 deg, which is a strong argument in support of the models explaining the stability of the observed superorbital variability with the precession of the neutron star. article_processing_charge: No article_type: original arxiv: 1 author: - first_name: Victor full_name: Doroshenko, Victor last_name: Doroshenko - first_name: Juri full_name: Poutanen, Juri last_name: Poutanen - first_name: Sergey S. full_name: Tsygankov, Sergey S. last_name: Tsygankov - first_name: Valery F. full_name: Suleimanov, Valery F. last_name: Suleimanov - first_name: Matteo full_name: Bachetti, Matteo last_name: Bachetti - first_name: Ilaria full_name: Caiazzo, Ilaria id: 8ae5b6e7-2a03-11ee-914d-b58ed7a3b47d last_name: Caiazzo orcid: 0000-0002-4770-5388 - first_name: Enrico full_name: Costa, Enrico last_name: Costa - first_name: Alessandro full_name: Di Marco, Alessandro last_name: Di Marco - first_name: Jeremy full_name: Heyl, Jeremy last_name: Heyl - first_name: Fabio full_name: La Monaca, Fabio last_name: La Monaca - first_name: Fabio full_name: Muleri, Fabio last_name: Muleri - first_name: Alexander A. full_name: Mushtukov, Alexander A. last_name: Mushtukov - first_name: George G. full_name: Pavlov, George G. last_name: Pavlov - first_name: Brian D. full_name: Ramsey, Brian D. last_name: Ramsey - first_name: John full_name: Rankin, John last_name: Rankin - first_name: Andrea full_name: Santangelo, Andrea last_name: Santangelo - first_name: Paolo full_name: Soffitta, Paolo last_name: Soffitta - first_name: Rüdiger full_name: Staubert, Rüdiger last_name: Staubert - first_name: Martin C. full_name: Weisskopf, Martin C. last_name: Weisskopf - first_name: Silvia full_name: Zane, Silvia last_name: Zane - first_name: Iván full_name: Agudo, Iván last_name: Agudo - first_name: Lucio A. full_name: Antonelli, Lucio A. last_name: Antonelli - first_name: Luca full_name: Baldini, Luca last_name: Baldini - first_name: Wayne H. full_name: Baumgartner, Wayne H. last_name: Baumgartner - first_name: Ronaldo full_name: Bellazzini, Ronaldo last_name: Bellazzini - first_name: Stefano full_name: Bianchi, Stefano last_name: Bianchi - first_name: Stephen D. full_name: Bongiorno, Stephen D. last_name: Bongiorno - first_name: Raffaella full_name: Bonino, Raffaella last_name: Bonino - first_name: Alessandro full_name: Brez, Alessandro last_name: Brez - first_name: Niccolò full_name: Bucciantini, Niccolò last_name: Bucciantini - first_name: Fiamma full_name: Capitanio, Fiamma last_name: Capitanio - first_name: Simone full_name: Castellano, Simone last_name: Castellano - first_name: Elisabetta full_name: Cavazzuti, Elisabetta last_name: Cavazzuti - first_name: Stefano full_name: Ciprini, Stefano last_name: Ciprini - first_name: Alessandra full_name: De Rosa, Alessandra last_name: De Rosa - first_name: Ettore full_name: Del Monte, Ettore last_name: Del Monte - first_name: Laura full_name: Di Gesu, Laura last_name: Di Gesu - first_name: Niccolò full_name: Di Lalla, Niccolò last_name: Di Lalla - first_name: Immacolata full_name: Donnarumma, Immacolata last_name: Donnarumma - first_name: Michal full_name: Dovčiak, Michal last_name: Dovčiak - first_name: Steven R. full_name: Ehlert, Steven R. last_name: Ehlert - first_name: Teruaki full_name: Enoto, Teruaki last_name: Enoto - first_name: Yuri full_name: Evangelista, Yuri last_name: Evangelista - first_name: Sergio full_name: Fabiani, Sergio last_name: Fabiani - first_name: Riccardo full_name: Ferrazzoli, Riccardo last_name: Ferrazzoli - first_name: Javier A. full_name: Garcia, Javier A. last_name: Garcia - first_name: Shuichi full_name: Gunji, Shuichi last_name: Gunji - first_name: Kiyoshi full_name: Hayashida, Kiyoshi last_name: Hayashida - first_name: Wataru full_name: Iwakiri, Wataru last_name: Iwakiri - first_name: Svetlana G. full_name: Jorstad, Svetlana G. last_name: Jorstad - first_name: Vladimir full_name: Karas, Vladimir last_name: Karas - first_name: Takao full_name: Kitaguchi, Takao last_name: Kitaguchi - first_name: Jeffery J. full_name: Kolodziejczak, Jeffery J. last_name: Kolodziejczak - first_name: Henric full_name: Krawczynski, Henric last_name: Krawczynski - first_name: Luca full_name: Latronico, Luca last_name: Latronico - first_name: Ioannis full_name: Liodakis, Ioannis last_name: Liodakis - first_name: Simone full_name: Maldera, Simone last_name: Maldera - first_name: Alberto full_name: Manfreda, Alberto last_name: Manfreda - first_name: Frédéric full_name: Marin, Frédéric last_name: Marin - first_name: Andrea full_name: Marinucci, Andrea last_name: Marinucci - first_name: Alan P. full_name: Marscher, Alan P. last_name: Marscher - first_name: Herman L. full_name: Marshall, Herman L. last_name: Marshall - first_name: Giorgio full_name: Matt, Giorgio last_name: Matt - first_name: Ikuyuki full_name: Mitsuishi, Ikuyuki last_name: Mitsuishi - first_name: Tsunefumi full_name: Mizuno, Tsunefumi last_name: Mizuno - first_name: Chi-Yung full_name: Ng, Chi-Yung last_name: Ng - first_name: Stephen L. full_name: O’Dell, Stephen L. last_name: O’Dell - first_name: Nicola full_name: Omodei, Nicola last_name: Omodei - first_name: Chiara full_name: Oppedisano, Chiara last_name: Oppedisano - first_name: Alessandro full_name: Papitto, Alessandro last_name: Papitto - first_name: Abel L. full_name: Peirson, Abel L. last_name: Peirson - first_name: Matteo full_name: Perri, Matteo last_name: Perri - first_name: Melissa full_name: Pesce-Rollins, Melissa last_name: Pesce-Rollins - first_name: Maura full_name: Pilia, Maura last_name: Pilia - first_name: Andrea full_name: Possenti, Andrea last_name: Possenti - first_name: Simonetta full_name: Puccetti, Simonetta last_name: Puccetti - first_name: Ajay full_name: Ratheesh, Ajay last_name: Ratheesh - first_name: Roger W. full_name: Romani, Roger W. last_name: Romani - first_name: Carmelo full_name: Sgrò, Carmelo last_name: Sgrò - first_name: Patrick full_name: Slane, Patrick last_name: Slane - first_name: Gloria full_name: Spandre, Gloria last_name: Spandre - first_name: Rashid A. full_name: Sunyaev, Rashid A. last_name: Sunyaev - first_name: Toru full_name: Tamagawa, Toru last_name: Tamagawa - first_name: Fabrizio full_name: Tavecchio, Fabrizio last_name: Tavecchio - first_name: Roberto full_name: Taverna, Roberto last_name: Taverna - first_name: Yuzuru full_name: Tawara, Yuzuru last_name: Tawara - first_name: Allyn F. full_name: Tennant, Allyn F. last_name: Tennant - first_name: Nicolas E. full_name: Thomas, Nicolas E. last_name: Thomas - first_name: Francesco full_name: Tombesi, Francesco last_name: Tombesi - first_name: Alessio full_name: Trois, Alessio last_name: Trois - first_name: Roberto full_name: Turolla, Roberto last_name: Turolla - first_name: Jacco full_name: Vink, Jacco last_name: Vink - first_name: Kinwah full_name: Wu, Kinwah last_name: Wu - first_name: Fei full_name: Xie, Fei last_name: Xie citation: ama: Doroshenko V, Poutanen J, Tsygankov SS, et al. Determination of X-ray pulsar geometry with IXPE polarimetry. Nature Astronomy. 2022;6(12):1433-1443. doi:10.1038/s41550-022-01799-5 apa: Doroshenko, V., Poutanen, J., Tsygankov, S. S., Suleimanov, V. F., Bachetti, M., Caiazzo, I., … Xie, F. (2022). Determination of X-ray pulsar geometry with IXPE polarimetry. Nature Astronomy. Springer Nature. https://doi.org/10.1038/s41550-022-01799-5 chicago: Doroshenko, Victor, Juri Poutanen, Sergey S. Tsygankov, Valery F. Suleimanov, Matteo Bachetti, Ilaria Caiazzo, Enrico Costa, et al. “Determination of X-Ray Pulsar Geometry with IXPE Polarimetry.” Nature Astronomy. Springer Nature, 2022. https://doi.org/10.1038/s41550-022-01799-5. ieee: V. Doroshenko et al., “Determination of X-ray pulsar geometry with IXPE polarimetry,” Nature Astronomy, vol. 6, no. 12. Springer Nature, pp. 1433–1443, 2022. ista: Doroshenko V, Poutanen J, Tsygankov SS, Suleimanov VF, Bachetti M, Caiazzo I, Costa E, Di Marco A, Heyl J, La Monaca F, Muleri F, Mushtukov AA, Pavlov GG, Ramsey BD, Rankin J, Santangelo A, Soffitta P, Staubert R, Weisskopf MC, Zane S, Agudo I, Antonelli LA, Baldini L, Baumgartner WH, Bellazzini R, Bianchi S, Bongiorno SD, Bonino R, Brez A, Bucciantini N, Capitanio F, Castellano S, Cavazzuti E, Ciprini S, De Rosa A, Del Monte E, Di Gesu L, Di Lalla N, Donnarumma I, Dovčiak M, Ehlert SR, Enoto T, Evangelista Y, Fabiani S, Ferrazzoli R, Garcia JA, Gunji S, Hayashida K, Iwakiri W, Jorstad SG, Karas V, Kitaguchi T, Kolodziejczak JJ, Krawczynski H, Latronico L, Liodakis I, Maldera S, Manfreda A, Marin F, Marinucci A, Marscher AP, Marshall HL, Matt G, Mitsuishi I, Mizuno T, Ng C-Y, O’Dell SL, Omodei N, Oppedisano C, Papitto A, Peirson AL, Perri M, Pesce-Rollins M, Pilia M, Possenti A, Puccetti S, Ratheesh A, Romani RW, Sgrò C, Slane P, Spandre G, Sunyaev RA, Tamagawa T, Tavecchio F, Taverna R, Tawara Y, Tennant AF, Thomas NE, Tombesi F, Trois A, Turolla R, Vink J, Wu K, Xie F. 2022. Determination of X-ray pulsar geometry with IXPE polarimetry. Nature Astronomy. 6(12), 1433–1443. mla: Doroshenko, Victor, et al. “Determination of X-Ray Pulsar Geometry with IXPE Polarimetry.” Nature Astronomy, vol. 6, no. 12, Springer Nature, 2022, pp. 1433–43, doi:10.1038/s41550-022-01799-5. short: V. Doroshenko, J. Poutanen, S.S. Tsygankov, V.F. Suleimanov, M. Bachetti, I. Caiazzo, E. Costa, A. Di Marco, J. Heyl, F. La Monaca, F. Muleri, A.A. Mushtukov, G.G. Pavlov, B.D. Ramsey, J. Rankin, A. Santangelo, P. Soffitta, R. Staubert, M.C. Weisskopf, S. Zane, I. Agudo, L.A. Antonelli, L. Baldini, W.H. Baumgartner, R. Bellazzini, S. Bianchi, S.D. Bongiorno, R. Bonino, A. Brez, N. Bucciantini, F. Capitanio, S. Castellano, E. Cavazzuti, S. Ciprini, A. De Rosa, E. Del Monte, L. Di Gesu, N. Di Lalla, I. Donnarumma, M. Dovčiak, S.R. Ehlert, T. Enoto, Y. Evangelista, S. Fabiani, R. Ferrazzoli, J.A. Garcia, S. Gunji, K. Hayashida, W. Iwakiri, S.G. Jorstad, V. Karas, T. Kitaguchi, J.J. Kolodziejczak, H. Krawczynski, L. Latronico, I. Liodakis, S. Maldera, A. Manfreda, F. Marin, A. Marinucci, A.P. Marscher, H.L. Marshall, G. Matt, I. Mitsuishi, T. Mizuno, C.-Y. Ng, S.L. O’Dell, N. Omodei, C. Oppedisano, A. Papitto, A.L. Peirson, M. Perri, M. Pesce-Rollins, M. Pilia, A. Possenti, S. Puccetti, A. Ratheesh, R.W. Romani, C. Sgrò, P. Slane, G. Spandre, R.A. Sunyaev, T. Tamagawa, F. Tavecchio, R. Taverna, Y. Tawara, A.F. Tennant, N.E. Thomas, F. Tombesi, A. Trois, R. Turolla, J. Vink, K. Wu, F. Xie, Nature Astronomy 6 (2022) 1433–1443. date_created: 2024-03-26T09:51:04Z date_published: 2022-10-22T00:00:00Z date_updated: 2024-04-02T07:16:54Z day: '22' doi: 10.1038/s41550-022-01799-5 extern: '1' external_id: arxiv: - '2206.07138' intvolume: ' 6' issue: '12' keyword: - Astronomy and Astrophysics language: - iso: eng main_file_link: - open_access: '1' url: https://arxiv.org/abs/2206.07138 month: '10' oa: 1 oa_version: Preprint page: 1433-1443 publication: Nature Astronomy publication_identifier: issn: - 2397-3366 publication_status: published publisher: Springer Nature quality_controlled: '1' scopus_import: '1' status: public title: Determination of X-ray pulsar geometry with IXPE polarimetry type: journal_article user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87 volume: 6 year: '2022' ... --- _id: '15205' abstract: - lang: eng text: 'Magnetars are neutron stars with ultrastrong magnetic fields, which can be observed in x-rays. Polarization measurements could provide information on their magnetic fields and surface properties. We observed polarized x-rays from the magnetar 4U 0142+61 using the Imaging X-ray Polarimetry Explorer and found a linear polarization degree of 13.5 ± 0.8% averaged over the 2– to 8–kilo–electron volt band. The polarization changes with energy: The degree is 15.0 ± 1.0% at 2 to 4 kilo–electron volts, drops below the instrumental sensitivity ~4 to 5 kilo–electron volts, and rises to 35.2 ± 7.1% at 5.5 to 8 kilo–electron volts. The polarization angle also changes by 90° at ~4 to 5 kilo–electron volts. These results are consistent with a model in which thermal radiation from the magnetar surface is reprocessed by scattering off charged particles in the magnetosphere.' article_processing_charge: No article_type: original arxiv: 1 author: - first_name: Roberto full_name: Taverna, Roberto last_name: Taverna - first_name: Roberto full_name: Turolla, Roberto last_name: Turolla - first_name: Fabio full_name: Muleri, Fabio last_name: Muleri - first_name: Jeremy full_name: Heyl, Jeremy last_name: Heyl - first_name: Silvia full_name: Zane, Silvia last_name: Zane - first_name: Luca full_name: Baldini, Luca last_name: Baldini - first_name: Denis full_name: González-Caniulef, Denis last_name: González-Caniulef - first_name: Matteo full_name: Bachetti, Matteo last_name: Bachetti - first_name: John full_name: Rankin, John last_name: Rankin - first_name: Ilaria full_name: Caiazzo, Ilaria id: 8ae5b6e7-2a03-11ee-914d-b58ed7a3b47d last_name: Caiazzo orcid: 0000-0002-4770-5388 - first_name: Niccolò full_name: Di Lalla, Niccolò last_name: Di Lalla - first_name: Victor full_name: Doroshenko, Victor last_name: Doroshenko - first_name: Manel full_name: Errando, Manel last_name: Errando - first_name: Ephraim full_name: Gau, Ephraim last_name: Gau - first_name: Demet full_name: Kırmızıbayrak, Demet last_name: Kırmızıbayrak - first_name: Henric full_name: Krawczynski, Henric last_name: Krawczynski - first_name: Michela full_name: Negro, Michela last_name: Negro - first_name: Mason full_name: Ng, Mason last_name: Ng - first_name: Nicola full_name: Omodei, Nicola last_name: Omodei - first_name: Andrea full_name: Possenti, Andrea last_name: Possenti - first_name: Toru full_name: Tamagawa, Toru last_name: Tamagawa - first_name: Keisuke full_name: Uchiyama, Keisuke last_name: Uchiyama - first_name: Martin C. full_name: Weisskopf, Martin C. last_name: Weisskopf - first_name: Ivan full_name: Agudo, Ivan last_name: Agudo - first_name: Lucio A. full_name: Antonelli, Lucio A. last_name: Antonelli - first_name: Wayne H. full_name: Baumgartner, Wayne H. last_name: Baumgartner - first_name: Ronaldo full_name: Bellazzini, Ronaldo last_name: Bellazzini - first_name: Stefano full_name: Bianchi, Stefano last_name: Bianchi - first_name: Stephen D. full_name: Bongiorno, Stephen D. last_name: Bongiorno - first_name: Raffaella full_name: Bonino, Raffaella last_name: Bonino - first_name: Alessandro full_name: Brez, Alessandro last_name: Brez - first_name: Niccolò full_name: Bucciantini, Niccolò last_name: Bucciantini - first_name: Fiamma full_name: Capitanio, Fiamma last_name: Capitanio - first_name: Simone full_name: Castellano, Simone last_name: Castellano - first_name: Elisabetta full_name: Cavazzuti, Elisabetta last_name: Cavazzuti - first_name: Stefano full_name: Ciprini, Stefano last_name: Ciprini - first_name: Enrico full_name: Costa, Enrico last_name: Costa - first_name: Alessandra full_name: De Rosa, Alessandra last_name: De Rosa - first_name: Ettore full_name: Del Monte, Ettore last_name: Del Monte - first_name: Laura full_name: Di Gesu, Laura last_name: Di Gesu - first_name: Alessandro full_name: Di Marco, Alessandro last_name: Di Marco - first_name: Immacolata full_name: Donnarumma, Immacolata last_name: Donnarumma - first_name: Michal full_name: Dovčiak, Michal last_name: Dovčiak - first_name: Steven R. full_name: Ehlert, Steven R. last_name: Ehlert - first_name: Teruaki full_name: Enoto, Teruaki last_name: Enoto - first_name: Yuri full_name: Evangelista, Yuri last_name: Evangelista - first_name: Sergio full_name: Fabiani, Sergio last_name: Fabiani - first_name: Riccardo full_name: Ferrazzoli, Riccardo last_name: Ferrazzoli - first_name: Javier A. full_name: Garcia, Javier A. last_name: Garcia - first_name: Shuichi full_name: Gunji, Shuichi last_name: Gunji - first_name: Kiyoshi full_name: Hayashida, Kiyoshi last_name: Hayashida - first_name: Wataru full_name: Iwakiri, Wataru last_name: Iwakiri - first_name: Svetlana G. full_name: Jorstad, Svetlana G. last_name: Jorstad - first_name: Vladimir full_name: Karas, Vladimir last_name: Karas - first_name: Takao full_name: Kitaguchi, Takao last_name: Kitaguchi - first_name: Jeffery J. full_name: Kolodziejczak, Jeffery J. last_name: Kolodziejczak - first_name: Fabio full_name: La Monaca, Fabio last_name: La Monaca - first_name: Luca full_name: Latronico, Luca last_name: Latronico - first_name: Ioannis full_name: Liodakis, Ioannis last_name: Liodakis - first_name: Simone full_name: Maldera, Simone last_name: Maldera - first_name: Alberto full_name: Manfreda, Alberto last_name: Manfreda - first_name: Frédéric full_name: Marin, Frédéric last_name: Marin - first_name: Andrea full_name: Marinucci, Andrea last_name: Marinucci - first_name: Alan P. full_name: Marscher, Alan P. last_name: Marscher - first_name: Herman L. full_name: Marshall, Herman L. last_name: Marshall - first_name: Giorgio full_name: Matt, Giorgio last_name: Matt - first_name: Ikuyuki full_name: Mitsuishi, Ikuyuki last_name: Mitsuishi - first_name: Tsunefumi full_name: Mizuno, Tsunefumi last_name: Mizuno - first_name: Stephen C.-Y. full_name: Ng, Stephen C.-Y. last_name: Ng - first_name: Stephen L. full_name: O’Dell, Stephen L. last_name: O’Dell - first_name: Chiara full_name: Oppedisano, Chiara last_name: Oppedisano - first_name: Alessandro full_name: Papitto, Alessandro last_name: Papitto - first_name: George G. full_name: Pavlov, George G. last_name: Pavlov - first_name: Abel L. full_name: Peirson, Abel L. last_name: Peirson - first_name: Matteo full_name: Perri, Matteo last_name: Perri - first_name: Melissa full_name: Pesce-Rollins, Melissa last_name: Pesce-Rollins - first_name: Maura full_name: Pilia, Maura last_name: Pilia - first_name: Juri full_name: Poutanen, Juri last_name: Poutanen - first_name: Simonetta full_name: Puccetti, Simonetta last_name: Puccetti - first_name: Brian D. full_name: Ramsey, Brian D. last_name: Ramsey - first_name: Ajay full_name: Ratheesh, Ajay last_name: Ratheesh - first_name: Roger W. full_name: Romani, Roger W. last_name: Romani - first_name: Carmelo full_name: Sgrò, Carmelo last_name: Sgrò - first_name: Patrick full_name: Slane, Patrick last_name: Slane - first_name: Paolo full_name: Soffitta, Paolo last_name: Soffitta - first_name: Gloria full_name: Spandre, Gloria last_name: Spandre - first_name: Fabrizio full_name: Tavecchio, Fabrizio last_name: Tavecchio - first_name: Yuzuru full_name: Tawara, Yuzuru last_name: Tawara - first_name: Allyn F. full_name: Tennant, Allyn F. last_name: Tennant - first_name: Nicholas E. full_name: Thomas, Nicholas E. last_name: Thomas - first_name: Francesco full_name: Tombesi, Francesco last_name: Tombesi - first_name: Alessio full_name: Trois, Alessio last_name: Trois - first_name: Sergey S. full_name: Tsygankov, Sergey S. last_name: Tsygankov - first_name: Jacco full_name: Vink, Jacco last_name: Vink - first_name: Kinwah full_name: Wu, Kinwah last_name: Wu - first_name: Fei full_name: Xie, Fei last_name: Xie citation: ama: Taverna R, Turolla R, Muleri F, et al. Polarized x-rays from a magnetar. Science. 2022;378(6620):646-650. doi:10.1126/science.add0080 apa: Taverna, R., Turolla, R., Muleri, F., Heyl, J., Zane, S., Baldini, L., … Xie, F. (2022). Polarized x-rays from a magnetar. Science. American Association for the Advancement of Science. https://doi.org/10.1126/science.add0080 chicago: Taverna, Roberto, Roberto Turolla, Fabio Muleri, Jeremy Heyl, Silvia Zane, Luca Baldini, Denis González-Caniulef, et al. “Polarized X-Rays from a Magnetar.” Science. American Association for the Advancement of Science, 2022. https://doi.org/10.1126/science.add0080. ieee: R. Taverna et al., “Polarized x-rays from a magnetar,” Science, vol. 378, no. 6620. American Association for the Advancement of Science, pp. 646–650, 2022. ista: Taverna R, Turolla R, Muleri F, Heyl J, Zane S, Baldini L, González-Caniulef D, Bachetti M, Rankin J, Caiazzo I, Di Lalla N, Doroshenko V, Errando M, Gau E, Kırmızıbayrak D, Krawczynski H, Negro M, Ng M, Omodei N, Possenti A, Tamagawa T, Uchiyama K, Weisskopf MC, Agudo I, Antonelli LA, Baumgartner WH, Bellazzini R, Bianchi S, Bongiorno SD, Bonino R, Brez A, Bucciantini N, Capitanio F, Castellano S, Cavazzuti E, Ciprini S, Costa E, De Rosa A, Del Monte E, Di Gesu L, Di Marco A, Donnarumma I, Dovčiak M, Ehlert SR, Enoto T, Evangelista Y, Fabiani S, Ferrazzoli R, Garcia JA, Gunji S, Hayashida K, Iwakiri W, Jorstad SG, Karas V, Kitaguchi T, Kolodziejczak JJ, La Monaca F, Latronico L, Liodakis I, Maldera S, Manfreda A, Marin F, Marinucci A, Marscher AP, Marshall HL, Matt G, Mitsuishi I, Mizuno T, Ng SC-Y, O’Dell SL, Oppedisano C, Papitto A, Pavlov GG, Peirson AL, Perri M, Pesce-Rollins M, Pilia M, Poutanen J, Puccetti S, Ramsey BD, Ratheesh A, Romani RW, Sgrò C, Slane P, Soffitta P, Spandre G, Tavecchio F, Tawara Y, Tennant AF, Thomas NE, Tombesi F, Trois A, Tsygankov SS, Vink J, Wu K, Xie F. 2022. Polarized x-rays from a magnetar. Science. 378(6620), 646–650. mla: Taverna, Roberto, et al. “Polarized X-Rays from a Magnetar.” Science, vol. 378, no. 6620, American Association for the Advancement of Science, 2022, pp. 646–50, doi:10.1126/science.add0080. short: R. Taverna, R. Turolla, F. Muleri, J. Heyl, S. Zane, L. Baldini, D. González-Caniulef, M. Bachetti, J. Rankin, I. Caiazzo, N. Di Lalla, V. Doroshenko, M. Errando, E. Gau, D. Kırmızıbayrak, H. Krawczynski, M. Negro, M. Ng, N. Omodei, A. Possenti, T. Tamagawa, K. Uchiyama, M.C. Weisskopf, I. Agudo, L.A. Antonelli, W.H. Baumgartner, R. Bellazzini, S. Bianchi, S.D. Bongiorno, R. Bonino, A. Brez, N. Bucciantini, F. Capitanio, S. Castellano, E. Cavazzuti, S. Ciprini, E. Costa, A. De Rosa, E. Del Monte, L. Di Gesu, A. Di Marco, I. Donnarumma, M. Dovčiak, S.R. Ehlert, T. Enoto, Y. Evangelista, S. Fabiani, R. Ferrazzoli, J.A. Garcia, S. Gunji, K. Hayashida, W. Iwakiri, S.G. Jorstad, V. Karas, T. Kitaguchi, J.J. Kolodziejczak, F. La Monaca, L. Latronico, I. Liodakis, S. Maldera, A. Manfreda, F. Marin, A. Marinucci, A.P. Marscher, H.L. Marshall, G. Matt, I. Mitsuishi, T. Mizuno, S.C.-Y. Ng, S.L. O’Dell, C. Oppedisano, A. Papitto, G.G. Pavlov, A.L. Peirson, M. Perri, M. Pesce-Rollins, M. Pilia, J. Poutanen, S. Puccetti, B.D. Ramsey, A. Ratheesh, R.W. Romani, C. Sgrò, P. Slane, P. Soffitta, G. Spandre, F. Tavecchio, Y. Tawara, A.F. Tennant, N.E. Thomas, F. Tombesi, A. Trois, S.S. Tsygankov, J. Vink, K. Wu, F. Xie, Science 378 (2022) 646–650. date_created: 2024-03-26T09:51:30Z date_published: 2022-11-03T00:00:00Z date_updated: 2024-04-02T07:17:25Z day: '03' doi: 10.1126/science.add0080 extern: '1' external_id: arxiv: - '2205.08898' intvolume: ' 378' issue: '6620' keyword: - Multidisciplinary language: - iso: eng main_file_link: - open_access: '1' url: https://arxiv.org/abs/2205.08898 month: '11' oa: 1 oa_version: Preprint page: 646-650 publication: Science publication_identifier: eissn: - 1095-9203 issn: - 0036-8075 publication_status: published publisher: American Association for the Advancement of Science quality_controlled: '1' scopus_import: '1' status: public title: Polarized x-rays from a magnetar type: journal_article user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87 volume: 378 year: '2022' ... --- _id: '15206' abstract: - lang: eng text: We use the Relativistic Precession Model (RPM) and quasi-periodic oscillation (QPO) observations from the Rossi X-ray Timing Explorer to derive constraints on the properties of the black holes that power these sources and to test general relativity (GR) in the strong field regime. We build upon past techniques by using pairs of simultaneously measured QPOs, rather than triplets, and by including characteristic frequencies from the broad noise components of the power spectra in our fits. We find the inclusion of these broad noise components causes an overestimate in masses and underestimate in spins compared to values derived independently from optical spectra. We extend the underlying space-time metric to constrain potential deviations from the predictions of GR for astrophysical black holes. To do this, we modify the RPM model to a Kerr–Newman–deSitter space-time and model changes in the radial, ecliptic, and vertical frequencies. We compare our models with X-ray data of XTE J1550-564 and GRO J1655-40 using robust statistical techniques to constrain the parameters of the black holes and the deviations from GR. For both sources, using QPO and characteristic frequency data, we constrain particular deviations from GR to be less than one part per thousand. article_processing_charge: No article_type: original arxiv: 1 author: - first_name: Katherine full_name: Rink, Katherine last_name: Rink - first_name: Ilaria full_name: Caiazzo, Ilaria id: 8ae5b6e7-2a03-11ee-914d-b58ed7a3b47d last_name: Caiazzo orcid: 0000-0002-4770-5388 - first_name: Jeremy full_name: Heyl, Jeremy last_name: Heyl citation: ama: 'Rink K, Caiazzo I, Heyl J. Testing general relativity using quasi-periodic oscillations from X-ray black holes: XTE J1550-564 and GRO J1655-40. Monthly Notices of the Royal Astronomical Society. 2022;517(1):1389-1397. doi:10.1093/mnras/stac2740' apa: 'Rink, K., Caiazzo, I., & Heyl, J. (2022). Testing general relativity using quasi-periodic oscillations from X-ray black holes: XTE J1550-564 and GRO J1655-40. Monthly Notices of the Royal Astronomical Society. Oxford University Press. https://doi.org/10.1093/mnras/stac2740' chicago: 'Rink, Katherine, Ilaria Caiazzo, and Jeremy Heyl. “Testing General Relativity Using Quasi-Periodic Oscillations from X-Ray Black Holes: XTE J1550-564 and GRO J1655-40.” Monthly Notices of the Royal Astronomical Society. Oxford University Press, 2022. https://doi.org/10.1093/mnras/stac2740.' ieee: 'K. Rink, I. Caiazzo, and J. Heyl, “Testing general relativity using quasi-periodic oscillations from X-ray black holes: XTE J1550-564 and GRO J1655-40,” Monthly Notices of the Royal Astronomical Society, vol. 517, no. 1. Oxford University Press, pp. 1389–1397, 2022.' ista: 'Rink K, Caiazzo I, Heyl J. 2022. Testing general relativity using quasi-periodic oscillations from X-ray black holes: XTE J1550-564 and GRO J1655-40. Monthly Notices of the Royal Astronomical Society. 517(1), 1389–1397.' mla: 'Rink, Katherine, et al. “Testing General Relativity Using Quasi-Periodic Oscillations from X-Ray Black Holes: XTE J1550-564 and GRO J1655-40.” Monthly Notices of the Royal Astronomical Society, vol. 517, no. 1, Oxford University Press, 2022, pp. 1389–97, doi:10.1093/mnras/stac2740.' short: K. Rink, I. Caiazzo, J. Heyl, Monthly Notices of the Royal Astronomical Society 517 (2022) 1389–1397. date_created: 2024-03-26T09:51:55Z date_published: 2022-09-28T00:00:00Z date_updated: 2024-04-02T07:18:07Z day: '28' doi: 10.1093/mnras/stac2740 extern: '1' external_id: arxiv: - '2107.06828' intvolume: ' 517' issue: '1' keyword: - Space and Planetary Science - Astronomy and Astrophysics language: - iso: eng main_file_link: - open_access: '1' url: https://arxiv.org/abs/2107.06828 month: '09' oa: 1 oa_version: Preprint page: 1389-1397 publication: Monthly Notices of the Royal Astronomical Society publication_identifier: eissn: - 1365-2966 issn: - 0035-8711 publication_status: published publisher: Oxford University Press quality_controlled: '1' scopus_import: '1' status: public title: 'Testing general relativity using quasi-periodic oscillations from X-ray black holes: XTE J1550-564 and GRO J1655-40' type: journal_article user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87 volume: 517 year: '2022' ... --- _id: '15207' abstract: - lang: eng text: Of more than a thousand known cataclysmic variables (CVs), where a white dwarf is accreting from a hydrogen-rich star, only a dozen have orbital periods below 75 minutes1,2,3,4,5,6,7,8,9. One way to achieve these short periods requires the donor star to have undergone substantial nuclear evolution before interacting with the white dwarf10,11,12,13,14, and it is expected that these objects will transition to helium accretion. These transitional CVs have been proposed as progenitors of helium CVs13,14,15,16,17,18. However, no known transitional CV is expected to reach an orbital period short enough to account for most of the helium CV population, leaving the role of this evolutionary pathway unclear. Here we report observations of ZTF J1813+4251, a 51-minute-orbital-period, fully eclipsing binary system consisting of a star with a temperature comparable to that of the Sun but a density 100 times greater owing to its helium-rich composition, accreting onto a white dwarf. Phase-resolved spectra, multi-band light curves and the broadband spectral energy distribution allow us to obtain precise and robust constraints on the masses, radii and temperatures of both components. Evolutionary modelling shows that ZTF J1813+4251 is destined to become a helium CV binary, reaching an orbital period under 20 minutes, rendering ZTF J1813+4251 a previously missing link between helium CV binaries and hydrogen-rich CVs. article_processing_charge: No article_type: original arxiv: 1 author: - first_name: Kevin B. full_name: Burdge, Kevin B. last_name: Burdge - first_name: Kareem full_name: El-Badry, Kareem last_name: El-Badry - first_name: Thomas R. full_name: Marsh, Thomas R. last_name: Marsh - first_name: Saul full_name: Rappaport, Saul last_name: Rappaport - first_name: Warren R. full_name: Brown, Warren R. last_name: Brown - first_name: Ilaria full_name: Caiazzo, Ilaria id: 8ae5b6e7-2a03-11ee-914d-b58ed7a3b47d last_name: Caiazzo orcid: 0000-0002-4770-5388 - first_name: Deepto full_name: Chakrabarty, Deepto last_name: Chakrabarty - first_name: V. S. full_name: Dhillon, V. S. last_name: Dhillon - first_name: Jim full_name: Fuller, Jim last_name: Fuller - first_name: Boris T. full_name: Gänsicke, Boris T. last_name: Gänsicke - first_name: Matthew J. full_name: Graham, Matthew J. last_name: Graham - first_name: Erin full_name: Kara, Erin last_name: Kara - first_name: S. R. full_name: Kulkarni, S. R. last_name: Kulkarni - first_name: S. P. full_name: Littlefair, S. P. last_name: Littlefair - first_name: Przemek full_name: Mróz, Przemek last_name: Mróz - first_name: Pablo full_name: Rodríguez-Gil, Pablo last_name: Rodríguez-Gil - first_name: Jan van full_name: Roestel, Jan van last_name: Roestel - first_name: Robert A. full_name: Simcoe, Robert A. last_name: Simcoe - first_name: Eric C. full_name: Bellm, Eric C. last_name: Bellm - first_name: Andrew J. full_name: Drake, Andrew J. last_name: Drake - first_name: Richard G. full_name: Dekany, Richard G. last_name: Dekany - first_name: Steven L. full_name: Groom, Steven L. last_name: Groom - first_name: Russ R. full_name: Laher, Russ R. last_name: Laher - first_name: Frank J. full_name: Masci, Frank J. last_name: Masci - first_name: Reed full_name: Riddle, Reed last_name: Riddle - first_name: Roger M. full_name: Smith, Roger M. last_name: Smith - first_name: Thomas A. full_name: Prince, Thomas A. last_name: Prince citation: ama: Burdge KB, El-Badry K, Marsh TR, et al. A dense 0.1-solar-mass star in a 51-minute-orbital-period eclipsing binary. Nature. 2022;610(7932):467-471. doi:10.1038/s41586-022-05195-x apa: Burdge, K. B., El-Badry, K., Marsh, T. R., Rappaport, S., Brown, W. R., Caiazzo, I., … Prince, T. A. (2022). A dense 0.1-solar-mass star in a 51-minute-orbital-period eclipsing binary. Nature. Springer Nature. https://doi.org/10.1038/s41586-022-05195-x chicago: Burdge, Kevin B., Kareem El-Badry, Thomas R. Marsh, Saul Rappaport, Warren R. Brown, Ilaria Caiazzo, Deepto Chakrabarty, et al. “A Dense 0.1-Solar-Mass Star in a 51-Minute-Orbital-Period Eclipsing Binary.” Nature. Springer Nature, 2022. https://doi.org/10.1038/s41586-022-05195-x. ieee: K. B. Burdge et al., “A dense 0.1-solar-mass star in a 51-minute-orbital-period eclipsing binary,” Nature, vol. 610, no. 7932. Springer Nature, pp. 467–471, 2022. ista: Burdge KB, El-Badry K, Marsh TR, Rappaport S, Brown WR, Caiazzo I, Chakrabarty D, Dhillon VS, Fuller J, Gänsicke BT, Graham MJ, Kara E, Kulkarni SR, Littlefair SP, Mróz P, Rodríguez-Gil P, Roestel J van, Simcoe RA, Bellm EC, Drake AJ, Dekany RG, Groom SL, Laher RR, Masci FJ, Riddle R, Smith RM, Prince TA. 2022. A dense 0.1-solar-mass star in a 51-minute-orbital-period eclipsing binary. Nature. 610(7932), 467–471. mla: Burdge, Kevin B., et al. “A Dense 0.1-Solar-Mass Star in a 51-Minute-Orbital-Period Eclipsing Binary.” Nature, vol. 610, no. 7932, Springer Nature, 2022, pp. 467–71, doi:10.1038/s41586-022-05195-x. short: K.B. Burdge, K. El-Badry, T.R. Marsh, S. Rappaport, W.R. Brown, I. Caiazzo, D. Chakrabarty, V.S. Dhillon, J. Fuller, B.T. Gänsicke, M.J. Graham, E. Kara, S.R. Kulkarni, S.P. Littlefair, P. Mróz, P. Rodríguez-Gil, J. van Roestel, R.A. Simcoe, E.C. Bellm, A.J. Drake, R.G. Dekany, S.L. Groom, R.R. Laher, F.J. Masci, R. Riddle, R.M. Smith, T.A. Prince, Nature 610 (2022) 467–471. date_created: 2024-03-26T09:52:17Z date_published: 2022-10-05T00:00:00Z date_updated: 2024-04-02T07:18:43Z day: '05' doi: 10.1038/s41586-022-05195-x extern: '1' external_id: arxiv: - '2210.01809' pmid: - '36198793' intvolume: ' 610' issue: '7932' language: - iso: eng main_file_link: - open_access: '1' url: https://arxiv.org/abs/2210.01809 month: '10' oa: 1 oa_version: Preprint page: 467-471 pmid: 1 publication: Nature publication_identifier: eissn: - 1476-4687 issn: - 0028-0836 publication_status: published publisher: Springer Nature quality_controlled: '1' scopus_import: '1' status: public title: A dense 0.1-solar-mass star in a 51-minute-orbital-period eclipsing binary type: journal_article user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87 volume: 610 year: '2022' ... --- _id: '15208' abstract: - lang: eng text: This year, a new era of observations of compact objects in X-ray polarization is commencing. Among the key targets for the Imaging X-ray Polarimetry Explorer mission are the magnetars 4U 0142+61 and 1RXS J170849.0-400910. Here, we present detailed predictions of the expected polarization from these sources that incorporate realistic models of emission physics at the surface (gaseous or condensed), the temperature distribution on the surface, general relativity, quantum electrodynamics, and scattering in the magnetosphere, accounting for the broad-band spectral energy distribution from below 1 keV to nearly 100 keV. We find that either atmospheres or condensed surfaces can account for the emission at a few keV. In both cases, either a small hot polar cap or scattering is required to account for the emission at 5–10 keV and, above 10 keV, scattering by a hard population of electrons can account for the rising power in the hard X-rays observed in many magnetars in quiescence. Although these different scenarios result in very similar spectral energy distributions, they generate dramatically different polarization signatures from 2 to 8 keV, which is the range of sensitivity of the Imaging X-ray Polarimetry Explorer. Observations of these sources in X-ray polarization will therefore probe the emission from magnetars in an essentially new way. article_processing_charge: No article_type: original arxiv: 1 author: - first_name: Ilaria full_name: Caiazzo, Ilaria id: 8ae5b6e7-2a03-11ee-914d-b58ed7a3b47d last_name: Caiazzo orcid: 0000-0002-4770-5388 - first_name: Denis full_name: González-Caniulef, Denis last_name: González-Caniulef - first_name: Jeremy full_name: Heyl, Jeremy last_name: Heyl - first_name: Rodrigo full_name: Fernández, Rodrigo last_name: Fernández citation: ama: Caiazzo I, González-Caniulef D, Heyl J, Fernández R. Probing magnetar emission mechanisms with X-ray spectropolarimetry. Monthly Notices of the Royal Astronomical Society. 2022;514(4):5024-5034. doi:10.1093/mnras/stac1571 apa: Caiazzo, I., González-Caniulef, D., Heyl, J., & Fernández, R. (2022). Probing magnetar emission mechanisms with X-ray spectropolarimetry. Monthly Notices of the Royal Astronomical Society. Oxford University Press. https://doi.org/10.1093/mnras/stac1571 chicago: Caiazzo, Ilaria, Denis González-Caniulef, Jeremy Heyl, and Rodrigo Fernández. “Probing Magnetar Emission Mechanisms with X-Ray Spectropolarimetry.” Monthly Notices of the Royal Astronomical Society. Oxford University Press, 2022. https://doi.org/10.1093/mnras/stac1571. ieee: I. Caiazzo, D. González-Caniulef, J. Heyl, and R. Fernández, “Probing magnetar emission mechanisms with X-ray spectropolarimetry,” Monthly Notices of the Royal Astronomical Society, vol. 514, no. 4. Oxford University Press, pp. 5024–5034, 2022. ista: Caiazzo I, González-Caniulef D, Heyl J, Fernández R. 2022. Probing magnetar emission mechanisms with X-ray spectropolarimetry. Monthly Notices of the Royal Astronomical Society. 514(4), 5024–5034. mla: Caiazzo, Ilaria, et al. “Probing Magnetar Emission Mechanisms with X-Ray Spectropolarimetry.” Monthly Notices of the Royal Astronomical Society, vol. 514, no. 4, Oxford University Press, 2022, pp. 5024–34, doi:10.1093/mnras/stac1571. short: I. Caiazzo, D. González-Caniulef, J. Heyl, R. Fernández, Monthly Notices of the Royal Astronomical Society 514 (2022) 5024–5034. date_created: 2024-03-26T09:52:41Z date_published: 2022-06-09T00:00:00Z date_updated: 2024-10-14T12:32:39Z day: '09' doi: 10.1093/mnras/stac1571 extern: '1' external_id: arxiv: - '2112.03401' intvolume: ' 514' issue: '4' keyword: - Space and Planetary Science - Astronomy and Astrophysics language: - iso: eng main_file_link: - open_access: '1' url: https://arxiv.org/abs/2112.03401 month: '06' oa: 1 oa_version: Preprint page: 5024-5034 publication: Monthly Notices of the Royal Astronomical Society publication_identifier: eissn: - 1365-2966 issn: - 0035-8711 publication_status: published publisher: Oxford University Press quality_controlled: '1' scopus_import: '1' status: public title: Probing magnetar emission mechanisms with X-ray spectropolarimetry type: journal_article user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87 volume: 514 year: '2022' ... --- _id: '15209' abstract: - lang: eng text: It has been recently suggested that white dwarfs generate magnetic fields in a process analogous to the Earth. The crystallization of the core creates a compositional inversion that drives convection, and combined with rotation, this can sustain a magnetic dynamo. We reanalyse the dynamo mechanism, arising from the slow crystallization of the core, and find convective turnover times tconv of weeks to months – longer by orders of magnitude than previously thought. With white dwarf spin periods P ≪ tconv, crystallization-driven dynamos are almost always in the fast-rotating regime, where the magnetic field B is at least in equipartition with the convective motion and is possibly further enhanced by a factor of B ∝ (tconv/P)1/2, depending on the assumed dynamo scaling law. We track the growth of the crystallized core using MESA and compute the magnetic field B(Teff) as a function of the white dwarf’s effective temperature Teff. We compare this prediction with observations and show that crystallization-driven dynamos can explain some – but not all – of the ∼MG magnetic fields measured for single white dwarfs, as well as the stronger fields measured for white dwarfs in cataclysmic variables, which were spun up by mass accretion to short P. Our B(Teff) curves might also explain the clustering of white dwarfs with Balmer emission lines around Teff ≈ 7500 K. article_processing_charge: No article_type: original arxiv: 1 author: - first_name: Sivan full_name: Ginzburg, Sivan last_name: Ginzburg - first_name: Jim full_name: Fuller, Jim last_name: Fuller - first_name: Adela full_name: Kawka, Adela last_name: Kawka - first_name: Ilaria full_name: Caiazzo, Ilaria id: 8ae5b6e7-2a03-11ee-914d-b58ed7a3b47d last_name: Caiazzo orcid: 0000-0002-4770-5388 citation: ama: Ginzburg S, Fuller J, Kawka A, Caiazzo I. Slow convection and fast rotation in crystallization-driven white dwarf dynamos. Monthly Notices of the Royal Astronomical Society. 2022;514(3):4111-4119. doi:10.1093/mnras/stac1363 apa: Ginzburg, S., Fuller, J., Kawka, A., & Caiazzo, I. (2022). Slow convection and fast rotation in crystallization-driven white dwarf dynamos. Monthly Notices of the Royal Astronomical Society. Oxford University Press. https://doi.org/10.1093/mnras/stac1363 chicago: Ginzburg, Sivan, Jim Fuller, Adela Kawka, and Ilaria Caiazzo. “Slow Convection and Fast Rotation in Crystallization-Driven White Dwarf Dynamos.” Monthly Notices of the Royal Astronomical Society. Oxford University Press, 2022. https://doi.org/10.1093/mnras/stac1363. ieee: S. Ginzburg, J. Fuller, A. Kawka, and I. Caiazzo, “Slow convection and fast rotation in crystallization-driven white dwarf dynamos,” Monthly Notices of the Royal Astronomical Society, vol. 514, no. 3. Oxford University Press, pp. 4111–4119, 2022. ista: Ginzburg S, Fuller J, Kawka A, Caiazzo I. 2022. Slow convection and fast rotation in crystallization-driven white dwarf dynamos. Monthly Notices of the Royal Astronomical Society. 514(3), 4111–4119. mla: Ginzburg, Sivan, et al. “Slow Convection and Fast Rotation in Crystallization-Driven White Dwarf Dynamos.” Monthly Notices of the Royal Astronomical Society, vol. 514, no. 3, Oxford University Press, 2022, pp. 4111–19, doi:10.1093/mnras/stac1363. short: S. Ginzburg, J. Fuller, A. Kawka, I. Caiazzo, Monthly Notices of the Royal Astronomical Society 514 (2022) 4111–4119. date_created: 2024-03-26T09:53:04Z date_published: 2022-05-16T00:00:00Z date_updated: 2024-04-02T07:24:15Z day: '16' doi: 10.1093/mnras/stac1363 extern: '1' external_id: arxiv: - '2202.12902' intvolume: ' 514' issue: '3' keyword: - Space and Planetary Science - Astronomy and Astrophysics language: - iso: eng main_file_link: - open_access: '1' url: https://arxiv.org/abs/2202.12902 month: '05' oa: 1 oa_version: Preprint page: 4111-4119 publication: Monthly Notices of the Royal Astronomical Society publication_identifier: eissn: - 1365-2966 issn: - 0035-8711 publication_status: published publisher: Oxford University Press quality_controlled: '1' scopus_import: '1' status: public title: Slow convection and fast rotation in crystallization-driven white dwarf dynamos type: journal_article user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87 volume: 514 year: '2022' ... --- _id: '15210' abstract: - lang: eng text: The maximum mass of a star that can produce a white dwarf (WD) is an important astrophysical quantity. One of the best approaches to establishing this limit is to search for WDs in young star clusters in which only massive stars have had time to evolve and where the mass of the progenitor can be established from the cooling time of the WD together with the age of the cluster. Searches in young Milky Way clusters have not thus far yielded WD members more massive than about 1.1 M⊙, well below the Chandrasekhar mass of 1.38 M⊙, nor progenitors with masses in excess of about 6 M⊙. However, the hunt for potentially massive WDs that escaped their cluster environs is yielding interesting candidates. To expand the cluster sample further, we used HST to survey four young and massive star clusters in the Magellanic Clouds for bright WDs that could have evolved from stars as massive as 10 M⊙. We located five potential WD candidates in the oldest of the four clusters examined, the first extragalactic single WDs thus far discovered. As these hot WDs are very faint at optical wavelengths, final confirmation will likely have to await spectroscopy with 30 m class telescopes. article_number: L20 article_processing_charge: No article_type: original arxiv: 1 author: - first_name: Harvey B. full_name: Richer, Harvey B. last_name: Richer - first_name: Roger E. full_name: Cohen, Roger E. last_name: Cohen - first_name: Jeremy full_name: Heyl, Jeremy last_name: Heyl - first_name: Jason full_name: Kalirai, Jason last_name: Kalirai - first_name: Ilaria full_name: Caiazzo, Ilaria id: 8ae5b6e7-2a03-11ee-914d-b58ed7a3b47d last_name: Caiazzo orcid: 0000-0002-4770-5388 - first_name: Matteo full_name: Correnti, Matteo last_name: Correnti - first_name: Jeffrey full_name: Cummings, Jeffrey last_name: Cummings - first_name: Paul full_name: Goudfrooij, Paul last_name: Goudfrooij - first_name: Bradley M. S. full_name: Hansen, Bradley M. S. last_name: Hansen - first_name: Molly full_name: Peeples, Molly last_name: Peeples - first_name: Elena full_name: Sabbi, Elena last_name: Sabbi - first_name: Pier-Emmanuel full_name: Tremblay, Pier-Emmanuel last_name: Tremblay - first_name: Benjamin full_name: Williams, Benjamin last_name: Williams citation: ama: Richer HB, Cohen RE, Heyl J, et al. When do stars go boom? The Astrophysical Journal Letters. 2022;931(2). doi:10.3847/2041-8213/ac6585 apa: Richer, H. B., Cohen, R. E., Heyl, J., Kalirai, J., Caiazzo, I., Correnti, M., … Williams, B. (2022). When do stars go boom? The Astrophysical Journal Letters. American Astronomical Society. https://doi.org/10.3847/2041-8213/ac6585 chicago: Richer, Harvey B., Roger E. Cohen, Jeremy Heyl, Jason Kalirai, Ilaria Caiazzo, Matteo Correnti, Jeffrey Cummings, et al. “When Do Stars Go Boom?” The Astrophysical Journal Letters. American Astronomical Society, 2022. https://doi.org/10.3847/2041-8213/ac6585. ieee: H. B. Richer et al., “When do stars go boom?,” The Astrophysical Journal Letters, vol. 931, no. 2. American Astronomical Society, 2022. ista: Richer HB, Cohen RE, Heyl J, Kalirai J, Caiazzo I, Correnti M, Cummings J, Goudfrooij P, Hansen BMS, Peeples M, Sabbi E, Tremblay P-E, Williams B. 2022. When do stars go boom? The Astrophysical Journal Letters. 931(2), L20. mla: Richer, Harvey B., et al. “When Do Stars Go Boom?” The Astrophysical Journal Letters, vol. 931, no. 2, L20, American Astronomical Society, 2022, doi:10.3847/2041-8213/ac6585. short: H.B. Richer, R.E. Cohen, J. Heyl, J. Kalirai, I. Caiazzo, M. Correnti, J. Cummings, P. Goudfrooij, B.M.S. Hansen, M. Peeples, E. Sabbi, P.-E. Tremblay, B. Williams, The Astrophysical Journal Letters 931 (2022). date_created: 2024-03-26T10:28:48Z date_published: 2022-05-30T00:00:00Z date_updated: 2024-04-02T07:25:50Z day: '30' doi: 10.3847/2041-8213/ac6585 extern: '1' external_id: arxiv: - '2203.11264' intvolume: ' 931' issue: '2' keyword: - Space and Planetary Science - Astronomy and Astrophysics language: - iso: eng main_file_link: - open_access: '1' url: https://doi.org/10.3847/2041-8213/ac6585 month: '05' oa: 1 oa_version: Published Version publication: The Astrophysical Journal Letters publication_identifier: eissn: - 2041-8213 issn: - 2041-8205 publication_status: published publisher: American Astronomical Society quality_controlled: '1' scopus_import: '1' status: public title: When do stars go boom? tmp: image: /images/cc_by.png legal_code_url: https://creativecommons.org/licenses/by/4.0/legalcode name: Creative Commons Attribution 4.0 International Public License (CC-BY 4.0) short: CC BY (4.0) type: journal_article user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87 volume: 931 year: '2022' ... --- _id: '15211' abstract: - lang: eng text: Over a dozen millisecond pulsars are ablating low-mass companions in close binary systems. In the original ‘black widow’, the eight-hour orbital period eclipsing pulsar PSR J1959+2048 (PSR B1957+20)1, high-energy emission originating from the pulsar2 is irradiating and may eventually destroy3 a low-mass companion. These systems are not only physical laboratories that reveal the interesting results of exposing a close companion star to the relativistic energy output of a pulsar, but are also believed to harbour some of the most massive neutron stars4, allowing for robust tests of the neutron star equation of state. Here we report observations of ZTF J1406+1222, a wide hierarchical triple hosting a 62-minute orbital period black widow candidate, the optical flux of which varies by a factor of more than ten. ZTF J1406+1222 pushes the boundaries of evolutionary models5, falling below the 80-minute minimum orbital period of hydrogen-rich systems. The wide tertiary companion is a rare low-metallicity cool subdwarf star, and the system has a Galactic halo orbit consistent with passing near the Galactic Centre, making it a probe of formation channels, neutron star kick physics6 and binary evolution. article_processing_charge: No article_type: original arxiv: 1 author: - first_name: Kevin B. full_name: Burdge, Kevin B. last_name: Burdge - first_name: Thomas R. full_name: Marsh, Thomas R. last_name: Marsh - first_name: Jim full_name: Fuller, Jim last_name: Fuller - first_name: Eric C. full_name: Bellm, Eric C. last_name: Bellm - first_name: Ilaria full_name: Caiazzo, Ilaria id: 8ae5b6e7-2a03-11ee-914d-b58ed7a3b47d last_name: Caiazzo orcid: 0000-0002-4770-5388 - first_name: Deepto full_name: Chakrabarty, Deepto last_name: Chakrabarty - first_name: Michael W. full_name: Coughlin, Michael W. last_name: Coughlin - first_name: Kishalay full_name: De, Kishalay last_name: De - first_name: V. S. full_name: Dhillon, V. S. last_name: Dhillon - first_name: Matthew J. full_name: Graham, Matthew J. last_name: Graham - first_name: Pablo full_name: Rodríguez-Gil, Pablo last_name: Rodríguez-Gil - first_name: Amruta D. full_name: Jaodand, Amruta D. last_name: Jaodand - first_name: David L. full_name: Kaplan, David L. last_name: Kaplan - first_name: Erin full_name: Kara, Erin last_name: Kara - first_name: Albert K. H. full_name: Kong, Albert K. H. last_name: Kong - first_name: S. R. full_name: Kulkarni, S. R. last_name: Kulkarni - first_name: Kwan-Lok full_name: Li, Kwan-Lok last_name: Li - first_name: S. P. full_name: Littlefair, S. P. last_name: Littlefair - first_name: Walid A. full_name: Majid, Walid A. last_name: Majid - first_name: Przemek full_name: Mróz, Przemek last_name: Mróz - first_name: Aaron B. full_name: Pearlman, Aaron B. last_name: Pearlman - first_name: E. S. full_name: Phinney, E. S. last_name: Phinney - first_name: Jan van full_name: Roestel, Jan van last_name: Roestel - first_name: Robert A. full_name: Simcoe, Robert A. last_name: Simcoe - first_name: Igor full_name: Andreoni, Igor last_name: Andreoni - first_name: Andrew J. full_name: Drake, Andrew J. last_name: Drake - first_name: Richard G. full_name: Dekany, Richard G. last_name: Dekany - first_name: Dmitry A. full_name: Duev, Dmitry A. last_name: Duev - first_name: Erik C. full_name: Kool, Erik C. last_name: Kool - first_name: Ashish A. full_name: Mahabal, Ashish A. last_name: Mahabal - first_name: Michael S. full_name: Medford, Michael S. last_name: Medford - first_name: Reed full_name: Riddle, Reed last_name: Riddle - first_name: Thomas A. full_name: Prince, Thomas A. last_name: Prince citation: ama: Burdge KB, Marsh TR, Fuller J, et al. A 62-minute orbital period black widow binary in a wide hierarchical triple. Nature. 2022;605(7908):41-45. doi:10.1038/s41586-022-04551-1 apa: Burdge, K. B., Marsh, T. R., Fuller, J., Bellm, E. C., Caiazzo, I., Chakrabarty, D., … Prince, T. A. (2022). A 62-minute orbital period black widow binary in a wide hierarchical triple. Nature. Springer Nature. https://doi.org/10.1038/s41586-022-04551-1 chicago: Burdge, Kevin B., Thomas R. Marsh, Jim Fuller, Eric C. Bellm, Ilaria Caiazzo, Deepto Chakrabarty, Michael W. Coughlin, et al. “A 62-Minute Orbital Period Black Widow Binary in a Wide Hierarchical Triple.” Nature. Springer Nature, 2022. https://doi.org/10.1038/s41586-022-04551-1. ieee: K. B. Burdge et al., “A 62-minute orbital period black widow binary in a wide hierarchical triple,” Nature, vol. 605, no. 7908. Springer Nature, pp. 41–45, 2022. ista: Burdge KB, Marsh TR, Fuller J, Bellm EC, Caiazzo I, Chakrabarty D, Coughlin MW, De K, Dhillon VS, Graham MJ, Rodríguez-Gil P, Jaodand AD, Kaplan DL, Kara E, Kong AKH, Kulkarni SR, Li K-L, Littlefair SP, Majid WA, Mróz P, Pearlman AB, Phinney ES, Roestel J van, Simcoe RA, Andreoni I, Drake AJ, Dekany RG, Duev DA, Kool EC, Mahabal AA, Medford MS, Riddle R, Prince TA. 2022. A 62-minute orbital period black widow binary in a wide hierarchical triple. Nature. 605(7908), 41–45. mla: Burdge, Kevin B., et al. “A 62-Minute Orbital Period Black Widow Binary in a Wide Hierarchical Triple.” Nature, vol. 605, no. 7908, Springer Nature, 2022, pp. 41–45, doi:10.1038/s41586-022-04551-1. short: K.B. Burdge, T.R. Marsh, J. Fuller, E.C. Bellm, I. Caiazzo, D. Chakrabarty, M.W. Coughlin, K. De, V.S. Dhillon, M.J. Graham, P. Rodríguez-Gil, A.D. Jaodand, D.L. Kaplan, E. Kara, A.K.H. Kong, S.R. Kulkarni, K.-L. Li, S.P. Littlefair, W.A. Majid, P. Mróz, A.B. Pearlman, E.S. Phinney, J. van Roestel, R.A. Simcoe, I. Andreoni, A.J. Drake, R.G. Dekany, D.A. Duev, E.C. Kool, A.A. Mahabal, M.S. Medford, R. Riddle, T.A. Prince, Nature 605 (2022) 41–45. date_created: 2024-03-26T10:29:26Z date_published: 2022-05-04T00:00:00Z date_updated: 2024-04-02T07:26:19Z day: '04' doi: 10.1038/s41586-022-04551-1 extern: '1' external_id: arxiv: - '2205.02278' pmid: - '35508781' intvolume: ' 605' issue: '7908' keyword: - Multidisciplinary language: - iso: eng main_file_link: - open_access: '1' url: https://arxiv.org/abs/2205.02278 month: '05' oa: 1 oa_version: Preprint page: 41-45 pmid: 1 publication: Nature publication_identifier: eissn: - 1476-4687 issn: - 0028-0836 publication_status: published publisher: Springer Nature quality_controlled: '1' scopus_import: '1' status: public title: A 62-minute orbital period black widow binary in a wide hierarchical triple type: journal_article user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87 volume: 605 year: '2022' ... --- _id: '15212' abstract: - lang: eng text: We determine the distribution of cooling ages of massive Gaia EDR3 white dwarfs identified with over 90 per cent probability within 200 pc and with mass in the range 0.95–1.25 M⊙. Using three sets of publicly available models, we consider sub-samples of these white dwarfs sorted into three equally spaced mass bins. Under the assumption of a constant white dwarf formation rate, we find an excess of white dwarfs, both along the Q branch and below it, corresponding respectively to stars that are in the process of freezing and those that are completely frozen. We compare the cooling age distributions for each of these bins to the recently determined time-varying star formation rate of Gaia DR2 main sequence stars. For white dwarfs in the two lightest mass bins, spanning the mass range 0.95–1.15 M⊙, we find that the cumulative cooling age distribution is statistically consistent with the expectation from the star formation rate. For white dwarfs in the heaviest mass bin, 1.15–1.25 M⊙, we find that their cumulative distribution is inconsistent with the star formation rate for all of the models considered; instead, we find that their cooling age distribution is well fitted by a linear combination of the distribution expected for single stellar evolution products and the distribution expected for double white dwarf merger products when approximately 40–50 per cent of the 1.15–1.25 M⊙ white dwarfs that formed over the past 4 Gyr are produced through double white dwarf mergers. article_processing_charge: No article_type: original arxiv: 1 author: - first_name: Leesa full_name: Fleury, Leesa last_name: Fleury - first_name: Ilaria full_name: Caiazzo, Ilaria id: 8ae5b6e7-2a03-11ee-914d-b58ed7a3b47d last_name: Caiazzo orcid: 0000-0002-4770-5388 - first_name: Jeremy full_name: Heyl, Jeremy last_name: Heyl citation: ama: Fleury L, Caiazzo I, Heyl J. The cooling of massive white dwarfs from Gaia EDR3. Monthly Notices of the Royal Astronomical Society. 2022;511(4):5984-5993. doi:10.1093/mnras/stac458 apa: Fleury, L., Caiazzo, I., & Heyl, J. (2022). The cooling of massive white dwarfs from Gaia EDR3. Monthly Notices of the Royal Astronomical Society. Oxford University Press. https://doi.org/10.1093/mnras/stac458 chicago: Fleury, Leesa, Ilaria Caiazzo, and Jeremy Heyl. “The Cooling of Massive White Dwarfs from Gaia EDR3.” Monthly Notices of the Royal Astronomical Society. Oxford University Press, 2022. https://doi.org/10.1093/mnras/stac458. ieee: L. Fleury, I. Caiazzo, and J. Heyl, “The cooling of massive white dwarfs from Gaia EDR3,” Monthly Notices of the Royal Astronomical Society, vol. 511, no. 4. Oxford University Press, pp. 5984–5993, 2022. ista: Fleury L, Caiazzo I, Heyl J. 2022. The cooling of massive white dwarfs from Gaia EDR3. Monthly Notices of the Royal Astronomical Society. 511(4), 5984–5993. mla: Fleury, Leesa, et al. “The Cooling of Massive White Dwarfs from Gaia EDR3.” Monthly Notices of the Royal Astronomical Society, vol. 511, no. 4, Oxford University Press, 2022, pp. 5984–93, doi:10.1093/mnras/stac458. short: L. Fleury, I. Caiazzo, J. Heyl, Monthly Notices of the Royal Astronomical Society 511 (2022) 5984–5993. date_created: 2024-03-26T10:31:05Z date_published: 2022-02-21T00:00:00Z date_updated: 2024-04-02T07:26:50Z day: '21' doi: 10.1093/mnras/stac458 extern: '1' external_id: arxiv: - '2110.00598' intvolume: ' 511' issue: '4' keyword: - Space and Planetary Science - Astronomy and Astrophysics language: - iso: eng main_file_link: - open_access: '1' url: https://arxiv.org/abs/2110.00598 month: '02' oa: 1 oa_version: Preprint page: 5984-5993 publication: Monthly Notices of the Royal Astronomical Society publication_identifier: eissn: - 1365-2966 issn: - 0035-8711 publication_status: published publisher: Oxford University Press quality_controlled: '1' scopus_import: '1' status: public title: The cooling of massive white dwarfs from Gaia EDR3 type: journal_article user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87 volume: 511 year: '2022' ...