Details

Autor(en) / Beteiligte

• Addison, Brett C.
• Knudstrup, Emil
• Wong, Ian
• Hébrard, Guillaume
• Dorval, Patrick
• Snellen, Ignas
• Albrecht, Simon
• Bello-Arufe, Aaron
• Almenara, Jose-Manuel
• Boisse, Isabelle
• Bonfils, Xavier
• Dalal, Shweta
• Demangeon, Olivier D. S.
• Hoyer, Sergio
• Kiefer, Flavien
• Santos, N. C.
• Nowak, Grzegorz
• Luque, Rafael
• Stangret, Monika
• Palle, Enric
• Tronsgaard, René
• Antoci, Victoria
• Buchhave, Lars A.
• Günther, Maximilian N.
• Daylan, Tansu
• Murgas, Felipe
• Parviainen, Hannu
• Esparza-Borges, Emma
• Crouzet, Nicolas
• Narita, Norio
• Fukui, Akihiko
• Kawauchi, Kiyoe
• Watanabe, Noriharu
• Rabus, Markus
• Johnson, Marshall C.
• Otten, Gilles P. P. L.
• Jan Talens, Geert
• Cabot, Samuel H. C.
• Fischer, Debra A.
• Grundahl, Frank
• Fredslund Andersen, Mads
• Jessen-Hansen, Jens
• Pallé, Pere
• Shporer, Avi
• Ciardi, David R.
• Clark, Jake T.
• Wittenmyer, Robert A.
• Wright, Duncan J.
• Horner, Jonathan
• Collins, Karen A.
• Jensen, Eric L. N.
• Kielkopf, John F.
• Schwarz, Richard P.
• Srdoc, Gregor
• Yilmaz, Mesut
• Senavci, Hakan Volkan
• Diamond, Brendan
• Harbeck, Daniel
• Komacek, Thaddeus D.
• Smith, Jeffrey C.
• Wang, Songhu
• Eastman, Jason D.
• Stassun, Keivan G.
• Latham, David W.
• Vanderspek, Roland
• Seager, Sara
• Winn, Joshua N.
• Jenkins, Jon M.
• Louie, Dana R.
• Bouma, Luke G.
• Twicken, Joseph D.
• Levine, Alan M.
• McLean, Brian

Titel

TOI-1431b/MASCARA-5b: A Highly Irradiated Ultrahot Jupiter Orbiting One of the Hottest and Brightest Known Exoplanet Host Stars

Ist Teil von

• The Astronomical journal, 2021-12, Vol.162 (6), p.292

Ort / Verlag

Madison: The American Astronomical Society

Erscheinungsjahr

2021

Link zum Volltext

Quelle

EZB Free E-Journals

Beschreibungen/Notizen

• Abstract We present the discovery of a highly irradiated and moderately inflated ultrahot Jupiter, TOI-1431b/MASCARA-5 b (HD 201033b), first detected by NASA’s Transiting Exoplanet Survey Satellite mission (TESS) and the Multi-site All-Sky Camera (MASCARA). The signal was established to be of planetary origin through radial velocity measurements obtained using SONG, SOPHIE, FIES, NRES, and EXPRES, which show a reflex motion of K = 294.1 ± 1.1 m s −1 . A joint analysis of the TESS and ground-based photometry and radial velocity measurements reveals that TOI-1431b has a mass of M p = 3.12 ± 0.18 M J (990 ± 60 M ⊕ ), an inflated radius of R p = 1.49 ± 0.05 R J (16.7 ± 0.6 R ⊕ ), and an orbital period of P = 2.650237 ± 0.000003 days. Analysis of the spectral energy distribution of the host star reveals that the planet orbits a bright ( V = 8.049 mag) and young ( 0.29 − 0.19 + 0.32 Gyr) Am type star with T eff = 7690 − 250 + 400 K, resulting in a highly irradiated planet with an incident flux of 〈 F 〉 = 7.24 − 0.64 + 0.68 × 10 9 erg s −1 cm −2 ( 5300 − 470 + 500 S ⊕ ) and an equilibrium temperature of T eq = 2370 ± 70 K. TESS photometry also reveals a secondary eclipse with a depth of 127 − 5 + 4 ppm as well as the full phase curve of the planet’s thermal emission in the red-optical. This has allowed us to measure the dayside and nightside temperature of its atmosphere as T day = 3004 ± 64 K and T night = 2583 ± 63 K, the second hottest measured nightside temperature. The planet’s low day/night temperature contrast (∼420 K) suggests very efficient heat transport between the dayside and nightside hemispheres. Given the host star brightness and estimated secondary eclipse depth of ∼1000 ppm in the K band, the secondary eclipse is potentially detectable at near-IR wavelengths with ground-based facilities, and the planet is ideal for intensive atmospheric characterization through transmission and emission spectroscopy from space missions such as the James Webb Space Telescope and the Atmospheric Remote-sensing Infrared Exoplanet Large-survey.