--- _id: '13447' abstract: - lang: eng text: Asteroseismology has transformed stellar astrophysics. Red giant asteroseismology is a prime example, with oscillation periods and amplitudes that are readily detectable with time-domain space-based telescopes. These oscillations can be used to infer masses, ages and radii for large numbers of stars, providing unique constraints on stellar populations in our galaxy. The cadence, duration, and spatial resolution of the Roman galactic bulge time-domain survey (GBTDS) are well-suited for asteroseismology and will probe an important population not studied by prior missions. We identify photometric precision as a key requirement for realizing the potential of asteroseismology with Roman. A precision of 1 mmag per 15-min cadence or better for saturated stars will enable detections of the populous red clump star population in the Galactic bulge. If the survey efficiency is better than expected, we argue for repeat observations of the same fields to improve photometric precision, or covering additional fields to expand the stellar population reach if the photometric precision for saturated stars is better than 1 mmag. Asteroseismology is relatively insensitive to the timing of the observations during the mission, and the prime red clump targets can be observed in a single 70 day campaign in any given field. Complementary stellar characterization, particularly astrometry tied to the Gaia system, will also dramatically expand the diagnostic power of asteroseismology. We also highlight synergies to Roman GBTDS exoplanet science using transits and microlensing. article_number: '2307.03237' article_processing_charge: No author: - first_name: Daniel full_name: Huber, Daniel last_name: Huber - first_name: Marc full_name: Pinsonneault, Marc last_name: Pinsonneault - first_name: Paul full_name: Beck, Paul last_name: Beck - first_name: Timothy R. full_name: Bedding, Timothy R. last_name: Bedding - first_name: Joss Bland-Hawthorn full_name: Joss Bland-Hawthorn, Joss Bland-Hawthorn last_name: Joss Bland-Hawthorn - first_name: Sylvain N. full_name: Breton, Sylvain N. last_name: Breton - first_name: Lisa Annabelle full_name: Bugnet, Lisa Annabelle id: d9edb345-f866-11ec-9b37-d119b5234501 last_name: Bugnet orcid: 0000-0003-0142-4000 - first_name: William J. full_name: Chaplin, William J. last_name: Chaplin - first_name: Rafael A. full_name: Garcia, Rafael A. last_name: Garcia - first_name: Samuel K. full_name: Grunblatt, Samuel K. last_name: Grunblatt - first_name: Joyce A. full_name: Guzik, Joyce A. last_name: Guzik - first_name: Saskia full_name: Hekker, Saskia last_name: Hekker - first_name: Steven D. full_name: Kawaler, Steven D. last_name: Kawaler - first_name: Stephane full_name: Mathis, Stephane last_name: Mathis - first_name: Savita full_name: Mathur, Savita last_name: Mathur - first_name: Travis full_name: Metcalfe, Travis last_name: Metcalfe - first_name: Benoit full_name: Mosser, Benoit last_name: Mosser - first_name: Melissa K. full_name: Ness, Melissa K. last_name: Ness - first_name: Anthony L. full_name: Piro, Anthony L. last_name: Piro - first_name: Aldo full_name: Serenelli, Aldo last_name: Serenelli - first_name: Sanjib full_name: Sharma, Sanjib last_name: Sharma - first_name: David R. full_name: Soderblom, David R. last_name: Soderblom - first_name: Keivan G. full_name: Stassun, Keivan G. last_name: Stassun - first_name: Dennis full_name: Stello, Dennis last_name: Stello - first_name: Jamie full_name: Tayar, Jamie last_name: Tayar - first_name: Gerard T. van full_name: Belle, Gerard T. van last_name: Belle - first_name: Joel C. full_name: Zinn, Joel C. last_name: Zinn citation: ama: Huber D, Pinsonneault M, Beck P, et al. Asteroseismology with the Roman galactic bulge time-domain survey. arXiv. doi:10.48550/arXiv.2307.03237 apa: Huber, D., Pinsonneault, M., Beck, P., Bedding, T. R., Joss Bland-Hawthorn, J. B.-H., Breton, S. N., … Zinn, J. C. (n.d.). Asteroseismology with the Roman galactic bulge time-domain survey. arXiv. https://doi.org/10.48550/arXiv.2307.03237 chicago: Huber, Daniel, Marc Pinsonneault, Paul Beck, Timothy R. Bedding, Joss Bland-Hawthorn Joss Bland-Hawthorn, Sylvain N. Breton, Lisa Annabelle Bugnet, et al. “Asteroseismology with the Roman Galactic Bulge Time-Domain Survey.” ArXiv, n.d. https://doi.org/10.48550/arXiv.2307.03237. ieee: D. Huber et al., “Asteroseismology with the Roman galactic bulge time-domain survey,” arXiv. . ista: Huber D, Pinsonneault M, Beck P, Bedding TR, Joss Bland-Hawthorn JB-H, Breton SN, Bugnet LA, Chaplin WJ, Garcia RA, Grunblatt SK, Guzik JA, Hekker S, Kawaler SD, Mathis S, Mathur S, Metcalfe T, Mosser B, Ness MK, Piro AL, Serenelli A, Sharma S, Soderblom DR, Stassun KG, Stello D, Tayar J, Belle GT van, Zinn JC. Asteroseismology with the Roman galactic bulge time-domain survey. arXiv, 2307.03237. mla: Huber, Daniel, et al. “Asteroseismology with the Roman Galactic Bulge Time-Domain Survey.” ArXiv, 2307.03237, doi:10.48550/arXiv.2307.03237. short: D. Huber, M. Pinsonneault, P. Beck, T.R. Bedding, J.B.-H. Joss Bland-Hawthorn, S.N. Breton, L.A. Bugnet, W.J. Chaplin, R.A. Garcia, S.K. Grunblatt, J.A. Guzik, S. Hekker, S.D. Kawaler, S. Mathis, S. Mathur, T. Metcalfe, B. Mosser, M.K. Ness, A.L. Piro, A. Serenelli, S. Sharma, D.R. Soderblom, K.G. Stassun, D. Stello, J. Tayar, G.T. van Belle, J.C. Zinn, ArXiv (n.d.). date_created: 2023-08-02T07:30:43Z date_published: 2023-07-06T00:00:00Z date_updated: 2023-08-02T07:36:00Z day: '06' department: - _id: LiBu doi: 10.48550/arXiv.2307.03237 external_id: arxiv: - '2307.03237' language: - iso: eng main_file_link: - open_access: '1' url: https://doi.org/10.48550/arXiv.2307.03237 month: '07' oa: 1 oa_version: Preprint publication: arXiv publication_status: submitted status: public title: Asteroseismology with the Roman galactic bulge time-domain survey type: preprint user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87 year: '2023' ... --- _id: '14256' abstract: - lang: eng text: "Context. Space asteroseismology is revolutionizing our knowledge of the internal structure and dynamics of stars. A breakthrough is ongoing with the recent discoveries of signatures of strong magnetic fields in the core of red giant stars. The key signature for such a detection is the asymmetry these fields induce in the frequency splittings of observed dipolar mixed gravito-acoustic modes.\r\nAims. We investigate the ability of the observed asymmetries of the frequency splittings of dipolar mixed modes to constrain the geometrical properties of deep magnetic fields.\r\nMethods. We used the powerful analytical Racah-Wigner algebra used in quantum mechanics to characterize the geometrical couplings of dipolar mixed oscillation modes with various realistically plausible topologies of fossil magnetic fields. We also computed the induced perturbation of their frequencies.\r\nResults. First, in the case of an oblique magnetic dipole, we provide the exact analytical expression of the asymmetry as a function of the angle between the rotation and magnetic axes. Its value provides a direct measure of this angle. Second, considering a combination of axisymmetric dipolar and quadrupolar fields, we show how the asymmetry is blind to the unraveling of the relative strength and sign of each component. Finally, in the case of a given multipole, we show that a negative asymmetry is a signature of non-axisymmetric topologies.\r\nConclusions. Asymmetries of dipolar mixed modes provide a key bit of information on the geometrical topology of deep fossil magnetic fields, but this is insufficient on its own. Asteroseismic constraints should therefore be combined with spectropolarimetric observations and numerical simulations, which aim to predict the more probable stable large-scale geometries." acknowledgement: The authors are grateful to the referee for her/his detailed and constructive report, which has allowed us to improve our article. S. M. acknowledges support from the CNES GOLF-SOHO and PLATO grants at CEA/DAp and PNPS (CNRS/INSU). We thank R. A. Garcia for fruitful discussions and suggestions. article_number: L9 article_processing_charge: Yes (in subscription journal) article_type: letter_note author: - first_name: S. full_name: Mathis, S. last_name: Mathis - first_name: Lisa Annabelle full_name: Bugnet, Lisa Annabelle id: d9edb345-f866-11ec-9b37-d119b5234501 last_name: Bugnet orcid: 0000-0003-0142-4000 citation: ama: 'Mathis S, Bugnet LA. Asymmetries of frequency splittings of dipolar mixed modes: A window on the topology of deep magnetic fields. Astronomy and Astrophysics. 2023;676. doi:10.1051/0004-6361/202346832' apa: 'Mathis, S., & Bugnet, L. A. (2023). Asymmetries of frequency splittings of dipolar mixed modes: A window on the topology of deep magnetic fields. Astronomy and Astrophysics. EDP Sciences. https://doi.org/10.1051/0004-6361/202346832' chicago: 'Mathis, S., and Lisa Annabelle Bugnet. “Asymmetries of Frequency Splittings of Dipolar Mixed Modes: A Window on the Topology of Deep Magnetic Fields.” Astronomy and Astrophysics. EDP Sciences, 2023. https://doi.org/10.1051/0004-6361/202346832.' ieee: 'S. Mathis and L. A. Bugnet, “Asymmetries of frequency splittings of dipolar mixed modes: A window on the topology of deep magnetic fields,” Astronomy and Astrophysics, vol. 676. EDP Sciences, 2023.' ista: 'Mathis S, Bugnet LA. 2023. Asymmetries of frequency splittings of dipolar mixed modes: A window on the topology of deep magnetic fields. Astronomy and Astrophysics. 676, L9.' mla: 'Mathis, S., and Lisa Annabelle Bugnet. “Asymmetries of Frequency Splittings of Dipolar Mixed Modes: A Window on the Topology of Deep Magnetic Fields.” Astronomy and Astrophysics, vol. 676, L9, EDP Sciences, 2023, doi:10.1051/0004-6361/202346832.' short: S. Mathis, L.A. Bugnet, Astronomy and Astrophysics 676 (2023). date_created: 2023-09-03T22:01:15Z date_published: 2023-08-01T00:00:00Z date_updated: 2023-09-06T11:05:58Z day: '01' ddc: - '520' department: - _id: LiBu doi: 10.1051/0004-6361/202346832 external_id: arxiv: - '2306.11587' isi: - '001046037700007' file: - access_level: open_access checksum: 7b30d26fb2b7bcb5b5be1414950615f9 content_type: application/pdf creator: dernst date_created: 2023-09-06T07:13:19Z date_updated: 2023-09-06T07:13:19Z file_id: '14271' file_name: 2023_AstronomyAstrophysics_Mathis.pdf file_size: 458120 relation: main_file success: 1 file_date_updated: 2023-09-06T07:13:19Z has_accepted_license: '1' intvolume: ' 676' isi: 1 language: - iso: eng month: '08' oa: 1 oa_version: Published Version publication: Astronomy and Astrophysics publication_identifier: eissn: - 1432-0746 issn: - 0004-6361 publication_status: published publisher: EDP Sciences quality_controlled: '1' scopus_import: '1' status: public title: 'Asymmetries of frequency splittings of dipolar mixed modes: A window on the topology of deep magnetic fields' 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: c635000d-4b10-11ee-a964-aac5a93f6ac1 volume: 676 year: '2023' ... --- _id: '13443' abstract: - lang: eng text: 'The ages of solar-like stars have been at the center of many studies such as exoplanet characterization or Galactic-archeology. While ages are usually computed from stellar evolution models, relations linking ages to other stellar properties, such as rotation and magnetic activity, have been investigated. With the large catalog of 55,232 rotation periods, Prot, and photometric magnetic activity index, Sph from Kepler data, we have the opportunity to look for such magneto-gyro-chronology relations. Stellar ages are obtained with two stellar evolution codes that include treatment of angular momentum evolution, hence using Prot as input in addition to classical atmospheric parameters. We explore two different ways of predicting stellar ages on three subsamples with spectroscopic observations: solar analogs, late-F and G dwarfs, and K dwarfs. We first perform a Bayesian analysis to derive relations between Sph and ages between 1 and 5 Gyr, and other stellar properties. For late-F and G dwarfs, and K dwarfs, the multivariate regression favors the model with Prot and Sph with median differences of 0.1% and 0.2%, respectively. We also apply Machine Learning techniques with a Random Forest algorithm to predict ages up to 14 Gyr with the same set of input parameters. For late-F, G and K dwarfs together, predicted ages are on average within 5.3% of the model ages and improve to 3.1% when including Prot. These are very promising results for a quick age estimation for solar-like stars with photometric observations, especially with current and future space missions.' acknowledgement: 'This paper includes data collected by the Kepler mission and obtained from the MAST data archive at the Space Telescope Science Institute (STScI). Funding for the Kepler mission is provided by the NASA Science Mission Directorate. STScI is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS 5–26555. We acknowledge that this research was supported in part by the National Science Foundation under grant No. NSF PHY-1748958. S.M. acknowledges support from the Spanish Ministry of Science and Innovation (MICINN) with the Ramón y Cajal fellowship No. RYC-2015-17697, the grant No. PID2019-107061GB-C66, and through AEI under the Severo Ochoa Centres of Excellence Programme 2020–2023 (CEX2019-000920-S). S.M. and D.G.R. acknowledge support from the Spanish Ministry of Science and Innovation (MICINN) with the grant No. PID2019-107187GB-I00. Z.R.C. acknowledges support from National Aeronautics and Space Administration via the TESS Guest Investigator Program (grant No. 80NSSC18K18584). The work presented here was partially supported by the NASA grant NNX17AF27G. A.R.G.S. acknowledges the support by FCT through national funds and by FEDER through COMPETE2020 by the following grants: UIDB/04434/2020 and UIDP/04434/2020. A.R.G.S. is supported by FCT through the work contract No. 2020.02480.CEECIND/CP1631/CT0001. R.A.G., L.A., and S.N.B. acknowledge the support from PLATO and GOLF CNES grants. S.N.B. acknowledges support from PLATO ASI-INAF agreement No. 2015-019-R.1-2018.' article_number: '131' article_processing_charge: Yes article_type: original author: - first_name: Savita full_name: Mathur, Savita last_name: Mathur - first_name: Zachary R. full_name: Claytor, Zachary R. last_name: Claytor - first_name: Ângela R. G. full_name: Santos, Ângela R. G. last_name: Santos - first_name: Rafael A. full_name: García, Rafael A. last_name: García - first_name: Louis full_name: Amard, Louis last_name: Amard - first_name: Lisa Annabelle full_name: Bugnet, Lisa Annabelle id: d9edb345-f866-11ec-9b37-d119b5234501 last_name: Bugnet orcid: 0000-0003-0142-4000 - first_name: Enrico full_name: Corsaro, Enrico last_name: Corsaro - first_name: Alfio full_name: Bonanno, Alfio last_name: Bonanno - first_name: Sylvain N. full_name: Breton, Sylvain N. last_name: Breton - first_name: Diego full_name: Godoy-Rivera, Diego last_name: Godoy-Rivera - first_name: Marc H. full_name: Pinsonneault, Marc H. last_name: Pinsonneault - first_name: Jennifer full_name: van Saders, Jennifer last_name: van Saders citation: ama: Mathur S, Claytor ZR, Santos ÂRG, et al. Magnetic activity evolution of solar-like stars. I. Sph–age relation derived from Kepler observations. The Astrophysical Journal. 2023;952(2). doi:10.3847/1538-4357/acd118 apa: Mathur, S., Claytor, Z. R., Santos, Â. R. G., García, R. A., Amard, L., Bugnet, L. A., … van Saders, J. (2023). Magnetic activity evolution of solar-like stars. I. Sph–age relation derived from Kepler observations. The Astrophysical Journal. American Astronomical Society. https://doi.org/10.3847/1538-4357/acd118 chicago: Mathur, Savita, Zachary R. Claytor, Ângela R. G. Santos, Rafael A. García, Louis Amard, Lisa Annabelle Bugnet, Enrico Corsaro, et al. “Magnetic Activity Evolution of Solar-like Stars. I. Sph–Age Relation Derived from Kepler Observations.” The Astrophysical Journal. American Astronomical Society, 2023. https://doi.org/10.3847/1538-4357/acd118. ieee: S. Mathur et al., “Magnetic activity evolution of solar-like stars. I. Sph–age relation derived from Kepler observations,” The Astrophysical Journal, vol. 952, no. 2. American Astronomical Society, 2023. ista: Mathur S, Claytor ZR, Santos ÂRG, García RA, Amard L, Bugnet LA, Corsaro E, Bonanno A, Breton SN, Godoy-Rivera D, Pinsonneault MH, van Saders J. 2023. Magnetic activity evolution of solar-like stars. I. Sph–age relation derived from Kepler observations. The Astrophysical Journal. 952(2), 131. mla: Mathur, Savita, et al. “Magnetic Activity Evolution of Solar-like Stars. I. Sph–Age Relation Derived from Kepler Observations.” The Astrophysical Journal, vol. 952, no. 2, 131, American Astronomical Society, 2023, doi:10.3847/1538-4357/acd118. short: S. Mathur, Z.R. Claytor, Â.R.G. Santos, R.A. García, L. Amard, L.A. Bugnet, E. Corsaro, A. Bonanno, S.N. Breton, D. Godoy-Rivera, M.H. Pinsonneault, J. van Saders, The Astrophysical Journal 952 (2023). date_created: 2023-08-01T14:19:16Z date_published: 2023-08-01T00:00:00Z date_updated: 2023-12-13T12:00:15Z day: '01' ddc: - '520' department: - _id: LiBu doi: 10.3847/1538-4357/acd118 external_id: isi: - '001034185700001' file: - access_level: open_access checksum: f12452834d7ed6748dbf5ace18af4723 content_type: application/pdf creator: dernst date_created: 2023-08-02T07:42:26Z date_updated: 2023-08-02T07:42:26Z file_id: '13448' file_name: 2023_AstrophysicalJour_Mathur.pdf file_size: 4192386 relation: main_file success: 1 file_date_updated: 2023-08-02T07:42:26Z has_accepted_license: '1' intvolume: ' 952' isi: 1 issue: '2' keyword: - Space and Planetary Science - Astronomy and Astrophysics language: - iso: eng month: '08' oa: 1 oa_version: Published Version publication: The Astrophysical Journal publication_identifier: eissn: - 1538-4357 issn: - 0004-637X publication_status: published publisher: American Astronomical Society quality_controlled: '1' status: public title: Magnetic activity evolution of solar-like stars. I. Sph–age relation derived from Kepler observations 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: 952 year: '2023' ...