Exoplanet Ephemerides Change Observations (ExoEcho). II. Transit Timing Variation Analysis of Brown Dwarfs around Solar-type Stars
Transit timing variation (TTV) is a useful tool for studying the orbital properties of transiting objects. However, few TTV studies have been done on transiting brown dwarfs (BDs) around solar-type stars. Here we study the long-term TTV of a population of close BD companions around solar-type stars...
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| 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/add3f2 |
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| author | Wenqin Wang Xinyue Ma Zhangliang Chen Cong Yu Shangfei Liu Bo Ma |
| author_facet | Wenqin Wang Xinyue Ma Zhangliang Chen Cong Yu Shangfei Liu Bo Ma |
| author_sort | Wenqin Wang |
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| description | Transit timing variation (TTV) is a useful tool for studying the orbital properties of transiting objects. However, few TTV studies have been done on transiting brown dwarfs (BDs) around solar-type stars. Here we study the long-term TTV of a population of close BD companions around solar-type stars using Transiting Exoplanet Survey Satellite data. We use the measured orbital period change rate to constrain the tidal interaction strength between the host star and the BD companion and put limits on the destruction timescale of these transiting BDs. However, we find no statistically significant evidence of orbital decay or expansion in our sample based on the current data. This may be due to either poor observational data or inherently weak tidal dissipation. We then perform simulations to investigate future observation strategies for detecting orbital decay of transiting BDs, which show that NGTS-7A b, TOI-263 b, and LP 261-75 b are the most promising targets in the next few years. Our study demonstrates the potential of TTV technique to probe the formation and evolution of close BD companions around solar-type stars. |
| format | Article |
| id | doaj-art-55069607a1664878a3f8256c4e60f4ae |
| institution | DOAJ |
| issn | 1538-4357 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | The Astrophysical Journal |
| spelling | doaj-art-55069607a1664878a3f8256c4e60f4ae2025-08-20T03:10:42ZengIOP PublishingThe Astrophysical Journal1538-43572025-01-01986212110.3847/1538-4357/add3f2Exoplanet Ephemerides Change Observations (ExoEcho). II. Transit Timing Variation Analysis of Brown Dwarfs around Solar-type StarsWenqin Wang0https://orcid.org/0009-0007-2398-9076Xinyue Ma1https://orcid.org/0009-0009-7398-2942Zhangliang Chen2https://orcid.org/0009-0009-0562-0202Cong Yu3https://orcid.org/0000-0003-0454-7890Shangfei Liu4https://orcid.org/0000-0002-9442-137XBo Ma5https://orcid.org/0000-0002-0378-2023School of Physics and Astronomy, Sun Yat-sen University , Zhuhai 519082, People’s Republic of China ; mabo8@mail.sysu.edu.cn; CSST Science Center for the Guangdong-Hong Kong-Macau Great Bay Area, Sun Yat-sen University , Zhuhai 519082, People’s Republic of ChinaSchool of Physics and Astronomy, Sun Yat-sen University , Zhuhai 519082, People’s Republic of China ; mabo8@mail.sysu.edu.cn; CSST Science Center for the Guangdong-Hong Kong-Macau Great Bay Area, Sun Yat-sen University , Zhuhai 519082, People’s Republic of ChinaSchool of Physics and Astronomy, Sun Yat-sen University , Zhuhai 519082, People’s Republic of China ; mabo8@mail.sysu.edu.cn; CSST Science Center for the Guangdong-Hong Kong-Macau Great Bay Area, Sun Yat-sen University , Zhuhai 519082, People’s Republic of ChinaSchool of Physics and Astronomy, Sun Yat-sen University , Zhuhai 519082, People’s Republic of China ; mabo8@mail.sysu.edu.cn; CSST Science Center for the Guangdong-Hong Kong-Macau Great Bay Area, Sun Yat-sen University , Zhuhai 519082, People’s Republic of ChinaSchool of Physics and Astronomy, Sun Yat-sen University , Zhuhai 519082, People’s Republic of China ; mabo8@mail.sysu.edu.cn; CSST Science Center for the Guangdong-Hong Kong-Macau Great Bay Area, Sun Yat-sen University , Zhuhai 519082, People’s Republic of ChinaSchool of Physics and Astronomy, Sun Yat-sen University , Zhuhai 519082, People’s Republic of China ; mabo8@mail.sysu.edu.cn; CSST Science Center for the Guangdong-Hong Kong-Macau Great Bay Area, Sun Yat-sen University , Zhuhai 519082, People’s Republic of ChinaTransit timing variation (TTV) is a useful tool for studying the orbital properties of transiting objects. However, few TTV studies have been done on transiting brown dwarfs (BDs) around solar-type stars. Here we study the long-term TTV of a population of close BD companions around solar-type stars using Transiting Exoplanet Survey Satellite data. We use the measured orbital period change rate to constrain the tidal interaction strength between the host star and the BD companion and put limits on the destruction timescale of these transiting BDs. However, we find no statistically significant evidence of orbital decay or expansion in our sample based on the current data. This may be due to either poor observational data or inherently weak tidal dissipation. We then perform simulations to investigate future observation strategies for detecting orbital decay of transiting BDs, which show that NGTS-7A b, TOI-263 b, and LP 261-75 b are the most promising targets in the next few years. Our study demonstrates the potential of TTV technique to probe the formation and evolution of close BD companions around solar-type stars.https://doi.org/10.3847/1538-4357/add3f2Exoplanet astronomyBrown dwarfsTransit timing variation method |
| spellingShingle | Wenqin Wang Xinyue Ma Zhangliang Chen Cong Yu Shangfei Liu Bo Ma Exoplanet Ephemerides Change Observations (ExoEcho). II. Transit Timing Variation Analysis of Brown Dwarfs around Solar-type Stars The Astrophysical Journal Exoplanet astronomy Brown dwarfs Transit timing variation method |
| title | Exoplanet Ephemerides Change Observations (ExoEcho). II. Transit Timing Variation Analysis of Brown Dwarfs around Solar-type Stars |
| title_full | Exoplanet Ephemerides Change Observations (ExoEcho). II. Transit Timing Variation Analysis of Brown Dwarfs around Solar-type Stars |
| title_fullStr | Exoplanet Ephemerides Change Observations (ExoEcho). II. Transit Timing Variation Analysis of Brown Dwarfs around Solar-type Stars |
| title_full_unstemmed | Exoplanet Ephemerides Change Observations (ExoEcho). II. Transit Timing Variation Analysis of Brown Dwarfs around Solar-type Stars |
| title_short | Exoplanet Ephemerides Change Observations (ExoEcho). II. Transit Timing Variation Analysis of Brown Dwarfs around Solar-type Stars |
| title_sort | exoplanet ephemerides change observations exoecho ii transit timing variation analysis of brown dwarfs around solar type stars |
| topic | Exoplanet astronomy Brown dwarfs Transit timing variation method |
| url | https://doi.org/10.3847/1538-4357/add3f2 |
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