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TOI-1431b/MASCARA-5b: A highly irradiated Ultrahot Jupiter orbiting one of the hottest and brightest known exoplanet host stars
Addison, Brett
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
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
Johnson, Marshall
Otten, Gilles
Jan-Talens, Geert
Cabot, Samuel
Fischer, Debra
Grundahl, Frank
Fredslun-Andersen, Mads
Jessen-Hansen, Jens
Pallé, Pere
Shporer, Avi
Ciardi, David
Clark, Jake
Wittenmyer, Robert
Wright, Duncan
Horner, Jonathan
Collins, Karen
Jensen, Eric
Kielkopf, John
Schwarz, Richard
Srdoc, Gregor
Yilmaz, Mesut
Senavci, Hakan
Diamond, Brendan
Harbeck, Daniel
Komacek, Thaddeus
Smith, Jeffrey
Wang, Songhu
Eastman, Jason
Stassun, Keivan
Latham, David
Vanderspek, Roland
Seager, Sara
Winn, Joshua
Jenkins, Jon
Louie, Dana
Bouma, Luke
Twicken, Joseph
Levine, Alan
McLean, Brian
IOP Publishing
2021
We present the discovery of a highly irradiated and moderately inflated ultrahot Jupiter, TOI-1431b/MASCARA5 b (HD 201033b), first detected by NASA’s Transiting Exoplanet Survey Satellite mission (TESS) and the Multisite 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 Mp = 3.12 ± 0.18 MJ (990 ± 60 M⊕), an inflated radius of Rp = 1.49 ± 0.05 RJ (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 = -+ Teff 7690 250 400 K, resulting in a highly irradiated planet with an incident flux of á ñ= ´ - + F 7.24 0.64 0.68 109 erg s−1 cm−2 ( - + 5300 470 SÅ 500 ) and an equilibrium temperature of Teq = 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 Tday = 3004 ± 64 K and Tnight = 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.
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Hot Jupiters (753)
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