Details

Autor(en) / Beteiligte

• Gan, Tianjun
• Wang, Sharon X.
• Wang, Songhu
• Mao, Shude
• Huang, Chelsea X.
• Collins, Karen A.
• Stassun, Keivan G.
• Shporer, Avi
• Zhu, Wei
• Ricker, George R.
• Vanderspek, Roland
• Latham, David W.
• Seager, Sara
• Winn, Joshua N.
• Jenkins, Jon M.
• Barkaoui, Khalid
• Belinski, Alexander A.
• Ciardi, David R.
• Evans, Phil
• Girardin, Eric
• Maslennikova, Nataliia A.
• Mazeh, Tsevi
• Panahi, Aviad
• Pozuelos, Francisco J.
• Radford, Don J.
• Schwarz, Richard P.
• Twicken, Joseph D.
• Wünsche, Anaël
• Zucker, Shay

Titel

Occurrence Rate of Hot Jupiters Around Early-type M Dwarfs Based on Transiting Exoplanet Survey Satellite Data

Ist Teil von

• The Astronomical journal, 2023-01, Vol.165 (1), p.17

Ort / Verlag

Madison: The American Astronomical Society

Erscheinungsjahr

2023

Quelle

EZB Electronic Journals Library

Beschreibungen/Notizen

• Abstract We present an estimate of the occurrence rate of hot Jupiters (7 R ⊕ ≤ R p ≤ 2 R J , 0.8 ≤ P b ≤ 10 days) around early-type M dwarfs based on stars observed by the Transiting Exoplanet Survey Satellite (TESS) during its primary mission. We adopt stellar parameters from the TESS Input Catalog and construct a sample of 60,819 M dwarfs with 10.5 ≤ T mag ≤ 13.5, effective temperatures 2900 ≤ T eff ≤ 4000 K, and stellar masses 0.45 ≤ M * ≤ 0.65 M ⊙ . We conduct a uninformed transit search using a detection pipeline based on the box least square search and characterize the searching completeness through an injection and recovery experiment. We combine a series of vetting steps including light centroid measurement, odd/even and secondary eclipse analysis, rotation and transit period synchronization tests as well as inspecting the ground-based photometric, spectroscopic, and imaging observations. Finally, we find a total of nine planet candidates, all of which are known TESS objects of interest. We obtain an occurrence rate of 0.27% ± 0.09% for hot Jupiters around early-type M dwarfs that satisfy our selection criteria. Compared with previous studies, the occurrence rate of hot Jupiters around early-type M dwarfs is smaller than all measurements for FGK stars, although they are consistent within 1 σ –2 σ . There is a trend that the occurrence rate of hot Jupiters has a peak at G dwarfs and falls toward both hotter and cooler stars. Combining results from transit, radial velocity, and microlensing surveys, we find that hot Jupiters around early-type M dwarfs possibly show a steeper decrease in the occurrence rate per logarithmic semimajor axis bin ( dN / d log 10 a ) when compared with FGK stars.