Details

Autor(en) / Beteiligte

• Wong, Ian
• Shporer, Avi
• Zhou, George
• Kitzmann, Daniel
• Komacek, Thaddeus D.
• Tan, Xianyu
• Tronsgaard, René
• Buchhave, Lars A.
• Vissapragada, Shreyas
• Greklek-McKeon, Michael
• Rodriguez, Joseph E.
• Ahlers, John P.
• Quinn, Samuel N.
• Furlan, Elise
• Howell, Steve B.
• Bieryla, Allyson
• Heng, Kevin
• Knutson, Heather A.
• Collins, Karen A.
• McLeod, Kim K.
• Berlind, Perry
• Brown, Peyton
• Calkins, Michael L.
• de Leon, Jerome P.
• Esparza-Borges, Emma
• Esquerdo, Gilbert A.
• Fukui, Akihiko
• Gan, Tianjun
• Girardin, Eric
• Gnilka, Crystal L.
• Ikoma, Masahiro
• Jensen, Eric L. N.
• Kielkopf, John
• Kodama, Takanori
• Kurita, Seiya
• Lester, Kathryn V.
• Lewin, Pablo
• Marino, Giuseppe
• Murgas, Felipe
• Narita, Norio
• Pallé, Enric
• Schwarz, Richard P.
• Stassun, Keivan G.
• Tamura, Motohide
• Watanabe, Noriharu
• Benneke, Björn
• Ricker, George R.
• Latham, David W.
• Vanderspek, Roland
• Seager, Sara
• Winn, Joshua N.
• Jenkins, Jon M.
• Caldwell, Douglas A.
• Fong, William
• Huang, Chelsea X.
• Mireles, Ismael
• Schlieder, Joshua E.
• Shiao, Bernie
• Noel Villaseñor, Jesus

Titel

TOI-2109: An Ultrahot Gas Giant on a 16 hr Orbit

Ist Teil von

• The Astronomical journal, 2021-12, Vol.162 (6), p.256

Ort / Verlag

Goddard Space Flight Center: The American Astronomical Society

Erscheinungsjahr

2021

Quelle

Free E-Journal (出版社公開部分のみ）

Beschreibungen/Notizen

• We report the discovery of an ultrahot Jupiter with an extremely short orbital period of 0.67247414 ± 0.00000028 days (∼16 hr). The 1.347 ± 0.047 RJup planet, initially identified by the Transiting Exoplanet Survey Satellite (TESS) mission, orbits TOI-2109 (TIC 392476080)—a T(eff) ∼ 6500 K F-type star with a mass of 1.447 ± 0.077 Mꙩ, a radius of 1.698 ± 0.060 Rꙩ, and a rotational velocity of v sin i =81.9 ± 1.7 km/s. The planetary nature of TOI-2109b was confirmed through radial-velocity measurements, which yielded a planet mass of 5.02 ± 0.75 M(Jup). Analysis of the Doppler shadow in spectroscopic transit observations indicates a well-aligned system, with a sky-projected obliquity of λ = 1.°7± 1.°7. From the TESS full-orbit light curve, we measured a secondary eclipse depth of 731 ± 46 ppm, as well as phase-curve variations from the planet's longitudinal brightness modulation and ellipsoidal distortion of the host star. Combining the TESS-band occultation measurement with a K(s)-band secondary eclipse depth (2012 ± 80 ppm) derived from ground-based observations, we find that the dayside emission of TOI-2109b is consistent with a brightness temperature of 3631 ± 69 K, making it the second hottest exoplanet hitherto discovered. By virtue of its extreme irradiation and strong planet–star gravitational interaction, TOI-2109b is an exceptionally promising target for intensive follow-up studies using current and near-future telescope facilities to probe for orbital decay, detect tidally driven atmospheric escape, and assess the impacts of H2 dissociation and recombination on the global heat transport.