[{"OA_place":"publisher","file_date_updated":"2026-05-12T06:54:10Z","publication_identifier":{"issn":["1323-3580"],"eissn":["1448-6083"]},"volume":43,"year":"2026","article_number":"e052","day":"27","language":[{"iso":"eng"}],"ddc":["520"],"date_created":"2026-05-07T08:55:00Z","file":[{"date_created":"2026-05-12T06:54:10Z","access_level":"open_access","date_updated":"2026-05-12T06:54:10Z","content_type":"application/pdf","success":1,"file_id":"21862","checksum":"f8f3cd3765948e8b276176c71c9d4e02","creator":"dernst","file_size":3681016,"relation":"main_file","file_name":"2026_PublAstronomicalSocAustralia_Kara.pdf"}],"tmp":{"image":"/images/cc_by.png","short":"CC BY (4.0)","legal_code_url":"https://creativecommons.org/licenses/by/4.0/legalcode","name":"Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)"},"OA_type":"hybrid","title":"A study of transients from ground-based surveys reveals new ultra-compact accreting white dwarf binaries","acknowledgement":"We are grateful to the anonymous referee for providing\r\nus with useful comments and suggestions that improved our manuscript.\r\nJK and LRS acknowledge support from NASA grants NNH22ZDA001N-6152\r\nand 80NSSC24K0638. MPM is partially supported by the Swiss National\r\nScience Foundation IZSTZ0_216537 and by UNAM PAPIIT-IG101224. Based\r\non observations obtained at the international Gemini Observatory, a program\r\nof NSF NOIRLab, which is managed by the Association of Universities for\r\nResearch in Astronomy (AURA) under a cooperative agreement with the U.S.\r\nNational Science Foundation on behalf of the Gemini Observatory partnership:\r\nthe U.S. National Science Foundation (United States), National Research\r\nCouncil (Canada), Agencia Nacional de Investigación y Desarrollo (Chile), Ministerio de Ciencia, Tecnología e Innovación (Argentina), Ministério\r\nda Ciência, Tecnologia, Inovações e Comunicações (Brazil), and Korea\r\nAstronomy and Space Science Institute (Republic of Korea). The Gemini\r\ndata were obtained from programs GN-2023B-Q-310 and GS-2024A-Q-311\r\n(PI: Rivera Sandoval) and processed using DRAGONS (Data Reduction for\r\nAstronomy from Gemini Observatory North and South) The Digitized Sky\r\nSurveys were produced at the Space Telescope Science Institute under U.S.\r\nGovernment grant NAG W-2166. The images of these surveys are based on\r\nphotographic data obtained using the Oschin Schmidt Telescope on Palomar\r\nMountain and the UK Schmidt Telescope. The plates were processed into the\r\npresent compressed digital form with the permission of these institutions.\r\nThe National Geographic Society – Palomar Observatory Sky Atlas (POSS-I)\r\nwas made by the California Institute of Technology with grants from the\r\nNational Geographic Society. The Second Palomar Observatory Sky Survey\r\n(POSS-II) was made by the California Institute of Technology with funds\r\nfrom the National Science Foundation, the National Geographic Society, the\r\nSloan Foundation, the Samuel Oschin Foundation, and the Eastman Kodak\r\nCorporation. The Oschin Schmidt Telescope is operated by the California\r\nInstitute of Technology and Palomar Observatory. The UK Schmidt Telescope\r\nwas operated by the Royal Observatory Edinburgh, with funding from the\r\nUK Science and Engineering Research Council (later the UK Particle Physics\r\nand Astronomy Research Council), until 1988 June, and thereafter by the\r\nAnglo-Australian Observatory. The blue plates of the southern Sky Atlas\r\nand its Equatorial Extension (together known as the SERC-J), as well as the\r\nEquatorial Red (ER), and the Second Epoch [red] Survey (SES) were all taken\r\nwith the UK Schmidt. Supplemental funding for sky-survey work at the ST\r\nScI is provided by the European Southern Observatory. Based on observations\r\nobtained with the Samuel Oschin Telescope 48-inch and the 60-inch Telescope\r\nat the Palomar Observatory as part of the Zwicky Transient Facility project.\r\nZTF is supported by the National Science Foundation under Grants No. AST-\r\n1440341 and AST-2034437 and a collaboration including current partners\r\nCaltech, IPAC, the Oskar Klein Center at Stockholm University, the University\r\nof Maryland, University of California, Berkeley, the University of Wisconsin\r\nat Milwaukee, University of Warwick, Ruhr University, Cornell University,\r\nNorthwestern University, and Drexel University. Operations are conducted\r\nby COO, IPAC, and UW. This work has used data from the European\r\nSpace Agency (ESA) mission Gaia (https://www.cosmos.esa.int/gaia),\r\nprocessed by the Gaia Data Processing and Analysis Consortium (DPAC,\r\nhttps://www.cosmos.esa.int/web/gaia/dpac/consortium). Funding for the\r\nDPAC has been provided by national institutions, in particular, the institutions\r\nparticipating in the Gaia Multilateral Agreement. We acknowledge with\r\nthanks the variable star observations from the AAVSO International Database\r\ncontributed by observers worldwide and used in this research. This paper\r\nincludes data collected by the TESS mission. Funding for the TESS mission\r\nis provided by the NASA Science Mission Directorate. Some of the data\r\npresented in this paper were obtained from the B. Mikulski Archive for Space\r\nTelescopes (MAST). This research has made use of the SIMBAD database,\r\noperated at CDS, Strasbourg, France. This research has made use of ‘Aladin\r\nsky atlas’ developed at CDS, Strasbourg Observatory, France. This research\r\nhas made use of the VizieR catalogue access tool, CDS, Strasbourg, France.","article_processing_charge":"Yes (in subscription journal)","publication":"Publications of the Astronomical Society of Australia","publication_status":"published","month":"03","date_published":"2026-03-27T00:00:00Z","author":[{"first_name":"Jan","last_name":"Kára","full_name":"Kára, Jan"},{"first_name":"Liliana","last_name":"Rivera Sandoval","full_name":"Rivera Sandoval, Liliana"},{"first_name":"Wendy","last_name":"Mendoza","full_name":"Mendoza, Wendy"},{"full_name":"Maccarone, Thomas","first_name":"Thomas","last_name":"Maccarone"},{"last_name":"Pichardo Marcano","first_name":"Manuel","full_name":"Pichardo Marcano, Manuel"},{"last_name":"Salazar Manzano","first_name":"Luis E.","full_name":"Salazar Manzano, Luis E."},{"first_name":"Ryan J.","last_name":"Oelkers","full_name":"Oelkers, Ryan J."},{"first_name":"Joannes C","last_name":"van Roestel","id":"4d122fc8-6083-11f0-87a5-97d68b860333","full_name":"van Roestel, Joannes C"}],"status":"public","article_type":"original","type":"journal_article","user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","oa":1,"date_updated":"2026-05-12T06:57:40Z","intvolume":"        43","department":[{"_id":"IlCa"}],"abstract":[{"lang":"eng","text":"AM CVn stars are ultra-compact semi-detached binaries consisting of a white dwarf primary and a hydrogen-depleted secondary. In this\r\npaper, we present spectroscopic and photometric results of 15 transient sources pre-classified as AM CVn candidates. Our analysis confirms\r\n9 systems of the type AM CVn, 3 hydrogen-rich cataclysmic variables (accreting white dwarfs with near-main-sequence stars for donors),\r\nand 3 systems that could be evolved cataclysmic variables. Eight of the AM CVn stars are analysed spectroscopically for the first time,\r\nwhich increases the number of spectroscopically confirmed AM CVns by about 10%. TESS data revealed the orbital period of the AM CVn\r\nstar ASASSN-20pv to be Porb =27.282 min, which helps to constrain the possible values of its mass ratio. TESS also helped to determine\r\nthe superhump periods of one AM CVn star (ASASSN-19ct, Psh =30.94 min) and two cataclysmic variables we classify as WZ Sge stars\r\n(Psh =90.77 min for ZTF18aaaasnn and Psh =91.6min for ASASSN-15na).We identified very different abundances in the spectra of theAM\r\nCVns binaries ASASSN-15kf and ASASSN-20pv (both Porb ∼27.5min), suggesting different type of donors. Six of the studied AMCVns are\r\nX-ray sources, which helped to determine their mass accretion rates. Photometry shows that the duration of all the superoutbursts detected\r\nin the AM CVns is consistent with expectations from the disc instability model. Finally, we provide refined criteria for the identification of\r\nnew systems using all-sky surveys such as LSST."}],"publisher":"Cambridge University Press","has_accepted_license":"1","scopus_import":"1","_id":"21842","oa_version":"Published Version","quality_controlled":"1","PlanS_conform":"1","citation":{"short":"J. Kára, L. Rivera Sandoval, W. Mendoza, T. Maccarone, M. Pichardo Marcano, L.E. Salazar Manzano, R.J. Oelkers, J.C. van Roestel, Publications of the Astronomical Society of Australia 43 (2026).","ista":"Kára J, Rivera Sandoval L, Mendoza W, Maccarone T, Pichardo Marcano M, Salazar Manzano LE, Oelkers RJ, van Roestel JC. 2026. A study of transients from ground-based surveys reveals new ultra-compact accreting white dwarf binaries. Publications of the Astronomical Society of Australia. 43, e052.","apa":"Kára, J., Rivera Sandoval, L., Mendoza, W., Maccarone, T., Pichardo Marcano, M., Salazar Manzano, L. E., … van Roestel, J. C. (2026). A study of transients from ground-based surveys reveals new ultra-compact accreting white dwarf binaries. <i>Publications of the Astronomical Society of Australia</i>. Cambridge University Press. <a href=\"https://doi.org/10.1017/pasa.2026.10184\">https://doi.org/10.1017/pasa.2026.10184</a>","chicago":"Kára, Jan, Liliana Rivera Sandoval, Wendy Mendoza, Thomas Maccarone, Manuel Pichardo Marcano, Luis E. Salazar Manzano, Ryan J. Oelkers, and Joannes C van Roestel. “A Study of Transients from Ground-Based Surveys Reveals New Ultra-Compact Accreting White Dwarf Binaries.” <i>Publications of the Astronomical Society of Australia</i>. Cambridge University Press, 2026. <a href=\"https://doi.org/10.1017/pasa.2026.10184\">https://doi.org/10.1017/pasa.2026.10184</a>.","mla":"Kára, Jan, et al. “A Study of Transients from Ground-Based Surveys Reveals New Ultra-Compact Accreting White Dwarf Binaries.” <i>Publications of the Astronomical Society of Australia</i>, vol. 43, e052, Cambridge University Press, 2026, doi:<a href=\"https://doi.org/10.1017/pasa.2026.10184\">10.1017/pasa.2026.10184</a>.","ama":"Kára J, Rivera Sandoval L, Mendoza W, et al. A study of transients from ground-based surveys reveals new ultra-compact accreting white dwarf binaries. <i>Publications of the Astronomical Society of Australia</i>. 2026;43. doi:<a href=\"https://doi.org/10.1017/pasa.2026.10184\">10.1017/pasa.2026.10184</a>","ieee":"J. Kára <i>et al.</i>, “A study of transients from ground-based surveys reveals new ultra-compact accreting white dwarf binaries,” <i>Publications of the Astronomical Society of Australia</i>, vol. 43. Cambridge University Press, 2026."},"license":"https://creativecommons.org/licenses/by/4.0/","doi":"10.1017/pasa.2026.10184"}]