Discoveries and Properties of EL CVn–type Binaries in the TESS Survey
EL CVn–type systems represent a rare evolutionary stage in binary star evolution, providing ideal laboratories for investigating stable mass-transfer processes and the formation of extremely low-mass white dwarfs (ELM WDs). The Transiting Exoplanet Survey Satellite (TESS) has delivered an extensive...
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| Format: | Article |
| Language: | English |
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IOP Publishing
2025-01-01
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| Series: | The Astrophysical Journal |
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| Online Access: | https://doi.org/10.3847/1538-4357/ad9b9c |
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| author | Jianping Xiong Zhenwei Li Jiao Li Xiaobin Zhang Xiaodian Chen Kaifan Ji Zhanwen Han Xuefei Chen |
| author_facet | Jianping Xiong Zhenwei Li Jiao Li Xiaobin Zhang Xiaodian Chen Kaifan Ji Zhanwen Han Xuefei Chen |
| author_sort | Jianping Xiong |
| collection | DOAJ |
| description | EL CVn–type systems represent a rare evolutionary stage in binary star evolution, providing ideal laboratories for investigating stable mass-transfer processes and the formation of extremely low-mass white dwarfs (ELM WDs). The Transiting Exoplanet Survey Satellite (TESS) has delivered an extensive collection of high-precision time-domain photometric data, which is invaluable for studying EL CVn binaries. In this study, we identified 29 EL CVn systems from the TESS eclipsing binary catalogs (sectors 1–65), 11 of which are newly discovered. These systems consist of smaller, hotter prehelium WDs and A/F main-sequence stars. The orbital periods of these binaries range from 0.64 to 2.5 days. Utilizing TESS light curves, Gaia distances, and multiband photometric data (e.g., Galaxy Evolution Explorer, Two Micron All Sky Survey, Wide-field Infrared Survey Explorer, SkyMapper), we modeled the light curves and spectral energy distributions to derive system parameters, including effective temperatures, masses, and radii. These systems were then compared with the WD mass–period relation and the evolutionary tracks of ELM WDs. The comparison reveals that these binaries are consistent with the expected mass–period relation for WDs and align well with the evolutionary tracks on the T _eff − $\mathrm{log}g$ diagram for ELM WDs. This result suggests that these EL CVn systems likely formed through stable mass-transfer processes. We provide a catalog of complete parameters for 29 EL CVn systems identified from the TESS survey. This catalog will serve as an essential resource for studying binary mass transfer, WD formation, and pulsation phenomena in EL CVn–type systems. |
| format | Article |
| id | doaj-art-e66bd0e099b043db82b3d16a99b458e6 |
| institution | DOAJ |
| issn | 1538-4357 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | The Astrophysical Journal |
| spelling | doaj-art-e66bd0e099b043db82b3d16a99b458e62025-08-20T03:05:03ZengIOP PublishingThe Astrophysical Journal1538-43572025-01-01979210810.3847/1538-4357/ad9b9cDiscoveries and Properties of EL CVn–type Binaries in the TESS SurveyJianping Xiong0https://orcid.org/0000-0003-4829-6245Zhenwei Li1https://orcid.org/0000-0002-1421-4427Jiao Li2https://orcid.org/0000-0002-2577-1990Xiaobin Zhang3https://orcid.org/0000-0002-5164-3773Xiaodian Chen4https://orcid.org/0000-0001-7084-0484Kaifan Ji5https://orcid.org/0000-0001-8950-3875Zhanwen Han6https://orcid.org/0000-0001-9204-7778Xuefei Chen7https://orcid.org/0000-0001-5284-8001Yunnan Observatories, Chinese Academy of Sciences , 396 YangFangWang, Guandu District, Kunming 650216, People’s Republic of China ; xiongjianping@ynao.ac.cn, cxf@ynao.ac.cn; Key Laboratory for Structure and Evolution of Celestial Objects, Chinese Academy of Sciences , P.O. Box 110, Kunming 650216, People’s Republic of China; International Centre of Supernovae , Yunnan Key Laboratory, Kunming 650216, People’s Republic of ChinaYunnan Observatories, Chinese Academy of Sciences , 396 YangFangWang, Guandu District, Kunming 650216, People’s Republic of China ; xiongjianping@ynao.ac.cn, cxf@ynao.ac.cn; Key Laboratory for Structure and Evolution of Celestial Objects, Chinese Academy of Sciences , P.O. Box 110, Kunming 650216, People’s Republic of China; International Centre of Supernovae , Yunnan Key Laboratory, Kunming 650216, People’s Republic of ChinaYunnan Observatories, Chinese Academy of Sciences , 396 YangFangWang, Guandu District, Kunming 650216, People’s Republic of China ; xiongjianping@ynao.ac.cn, cxf@ynao.ac.cn; Key Laboratory for Structure and Evolution of Celestial Objects, Chinese Academy of Sciences , P.O. Box 110, Kunming 650216, People’s Republic of China; International Centre of Supernovae , Yunnan Key Laboratory, Kunming 650216, People’s Republic of ChinaCAS Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences , Beijing 100101, People’s Republic of China; School of Astronomy and Space Science, University of the Chinese Academy of Sciences , Beijing 101408, People’s Republic of China; Department of Astronomy, China West Normal University , Nanchong, People’s Republic of ChinaCAS Key Laboratory of Optical Astronomy, National Astronomical Observatories, Chinese Academy of Sciences , Beijing 100101, People’s Republic of China; School of Astronomy and Space Science, University of the Chinese Academy of Sciences , Beijing 101408, People’s Republic of China; Department of Astronomy, China West Normal University , Nanchong, People’s Republic of ChinaYunnan Observatories, Chinese Academy of Sciences , 396 YangFangWang, Guandu District, Kunming 650216, People’s Republic of China ; xiongjianping@ynao.ac.cn, cxf@ynao.ac.cnYunnan Observatories, Chinese Academy of Sciences , 396 YangFangWang, Guandu District, Kunming 650216, People’s Republic of China ; xiongjianping@ynao.ac.cn, cxf@ynao.ac.cn; Key Laboratory for Structure and Evolution of Celestial Objects, Chinese Academy of Sciences , P.O. Box 110, Kunming 650216, People’s Republic of China; International Centre of Supernovae , Yunnan Key Laboratory, Kunming 650216, People’s Republic of ChinaYunnan Observatories, Chinese Academy of Sciences , 396 YangFangWang, Guandu District, Kunming 650216, People’s Republic of China ; xiongjianping@ynao.ac.cn, cxf@ynao.ac.cn; Key Laboratory for Structure and Evolution of Celestial Objects, Chinese Academy of Sciences , P.O. Box 110, Kunming 650216, People’s Republic of China; International Centre of Supernovae , Yunnan Key Laboratory, Kunming 650216, People’s Republic of ChinaEL CVn–type systems represent a rare evolutionary stage in binary star evolution, providing ideal laboratories for investigating stable mass-transfer processes and the formation of extremely low-mass white dwarfs (ELM WDs). The Transiting Exoplanet Survey Satellite (TESS) has delivered an extensive collection of high-precision time-domain photometric data, which is invaluable for studying EL CVn binaries. In this study, we identified 29 EL CVn systems from the TESS eclipsing binary catalogs (sectors 1–65), 11 of which are newly discovered. These systems consist of smaller, hotter prehelium WDs and A/F main-sequence stars. The orbital periods of these binaries range from 0.64 to 2.5 days. Utilizing TESS light curves, Gaia distances, and multiband photometric data (e.g., Galaxy Evolution Explorer, Two Micron All Sky Survey, Wide-field Infrared Survey Explorer, SkyMapper), we modeled the light curves and spectral energy distributions to derive system parameters, including effective temperatures, masses, and radii. These systems were then compared with the WD mass–period relation and the evolutionary tracks of ELM WDs. The comparison reveals that these binaries are consistent with the expected mass–period relation for WDs and align well with the evolutionary tracks on the T _eff − $\mathrm{log}g$ diagram for ELM WDs. This result suggests that these EL CVn systems likely formed through stable mass-transfer processes. We provide a catalog of complete parameters for 29 EL CVn systems identified from the TESS survey. This catalog will serve as an essential resource for studying binary mass transfer, WD formation, and pulsation phenomena in EL CVn–type systems.https://doi.org/10.3847/1538-4357/ad9b9cEclipsing binary starsWhite dwarf starsAstronomy data analysisFundamental parameters of starsCatalogs |
| spellingShingle | Jianping Xiong Zhenwei Li Jiao Li Xiaobin Zhang Xiaodian Chen Kaifan Ji Zhanwen Han Xuefei Chen Discoveries and Properties of EL CVn–type Binaries in the TESS Survey The Astrophysical Journal Eclipsing binary stars White dwarf stars Astronomy data analysis Fundamental parameters of stars Catalogs |
| title | Discoveries and Properties of EL CVn–type Binaries in the TESS Survey |
| title_full | Discoveries and Properties of EL CVn–type Binaries in the TESS Survey |
| title_fullStr | Discoveries and Properties of EL CVn–type Binaries in the TESS Survey |
| title_full_unstemmed | Discoveries and Properties of EL CVn–type Binaries in the TESS Survey |
| title_short | Discoveries and Properties of EL CVn–type Binaries in the TESS Survey |
| title_sort | discoveries and properties of el cvn type binaries in the tess survey |
| topic | Eclipsing binary stars White dwarf stars Astronomy data analysis Fundamental parameters of stars Catalogs |
| url | https://doi.org/10.3847/1538-4357/ad9b9c |
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