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

Addison, Brett C. ORCID: https://orcid.org/0000-0003-3216-0626 and Knudstrup, Emil and Wong, Ian and Hebrard, Guillaume and Dorval, Patrick and Snellen, Ignas and Albrecht, Simon and Bello-Arufe, Aaron and Almenara, Jose-Manuel and Boisse, Isabelle and Bonfils, Xavier and Dalal, Shweta and Demangeon, Olivier D. S. and Hoyer, Sergio and Kiefer, Flavien and Santos, N. C. and Nowak, Grzegorz and Luque, Rafael and Stangret, Monika and Palle, Enric and Tronsgaard, Rene and Antoci, Victoria and Buchhave, Lars A. and Gunther, Maximilian N. and Daylan, Tansu and Murgas, Felipe and Parviainen, Hannu and Esparza-Borges, Emma and Crouzet, Nicolas and Narita, Norio and Fukui, Akihiko and Kawauchi, Kiyoe and Watanabe, Noriharu and Rabus, Markus and Johnson, Marshall C. and Otten, Gilles P. P. L. and Talens, Geert Jan and Cabot, Samuel H. C. and Fischer, Debra A. and Grundahl, Frank and Andersen, Mads Fredslund and Jessen-Hansen, Jens and Palle, Pere and Shporer, Avi and Ciardi, David R. and Clark, Jake T. and Wittenmyer, Robert A. and Wright, Duncan J. and Horner, Jonathan and Collins, Karen A. and Jensen, Eric L. N. and Kielkopf, John F. and Schwarz, Richard P. and Srdoc, Gregor and Yilmaz, Mesut and Senavci, Hakan Volkan and Diamond, Brendan and Harbeck, Daniel and Komacek, Thaddeus D. and Smith, Jeffrey C. and Wang, Songhu and Eastman, Jason D. and Stassun, Keivan G. and Latham, David W. and Vanderspek, Roland and Seager, Sara and Winn, Joshua N. and Jenkins, Jon M. and Louie, Dana R. and Bouma, Luke G. and Twicken, Joseph D. and Levine, Alan M. and McLean, Brian (2021) TOI-1431b/MASCARA-5b: A Highly Irradiated Ultrahot Jupiter Orbiting One of the Hottest and Brightest Known Exoplanet Host Stars. The Astronomical Journal, 162 (6):292. pp. 1-29. ISSN 0004-6256

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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 R eff=7690-250+400 K, resulting in a highly irradiated planet with an incident flux of F =7.24-0.64+0.68 × 109 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.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Faculty/School / Institute/Centre: Current - Institute for Advanced Engineering and Space Sciences - Centre for Astrophysics (1 Aug 2018 -)
Faculty/School / Institute/Centre: Current - Institute for Advanced Engineering and Space Sciences - Centre for Astrophysics (1 Aug 2018 -)
Date Deposited: 01 Feb 2022 06:05
Last Modified: 07 Feb 2022 05:24
Uncontrolled Keywords: Exoplanets; Hot Jupiters; Transit photometry; Radial velocity
Fields of Research (2008): 02 Physical Sciences > 0201 Astronomical and Space Sciences > 020110 Stellar Astronomy and Planetary Systems
Fields of Research (2020): 51 PHYSICAL SCIENCES > 5101 Astronomical sciences > 510109 Stellar astronomy and planetary systems
Socio-Economic Objectives (2008): E Expanding Knowledge > 97 Expanding Knowledge > 970102 Expanding Knowledge in the Physical Sciences
Socio-Economic Objectives (2020): 28 EXPANDING KNOWLEDGE > 2801 Expanding knowledge > 280120 Expanding knowledge in the physical sciences
Funding Details:
Identification Number or DOI: https://doi.org/10.3847/1538-3881/ac224e
URI: http://eprints.usq.edu.au/id/eprint/45668

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