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

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
Bibliographical reference

The Astronomical Journal

Advertised on:
12
2021
Description
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 ${T}_{\mathrm{eff}}={7690}_{-250}^{+400}$ K, resulting in a highly irradiated planet with an incident flux of $\langle F\rangle ={7.24}_{-0.64}^{+0.68}\times $ 109 erg s-1 cm-2 ( ${5300}_{-470}^{+500}\,{S}_{\oplus }$ ) 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.
Related projects
Helio and Asteroseismology
Helio and Astero-Seismology and Exoplanets Search

The principal objectives of this project are: 1) to study the structure and dynamics of the solar interior, 2) to extend this study to other stars, 3) to search for extrasolar planets using photometric methods (primarily by transits of their host stars) and their characterization (using radial velocity information) and 4) the study of the planetary

Savita
Mathur
Projects' name image
Exoplanets and Astrobiology

The search for life in the universe has been driven by recent discoveries of planets around other stars (known as exoplanets), becoming one of the most active fields in modern astrophysics. The growing number of new exoplanets discovered in recent years and the recent advance on the study of their atmospheres are not only providing new valuable

Enric
Pallé Bago