TOI-1431b/MASCARA-5b: A Highly Irradiated Ultrahot Jupiter Orbiting One of the Hottest and Brightest Known Exoplanet Host Stars
Article
Article Title | TOI-1431b/MASCARA-5b: A Highly Irradiated Ultrahot Jupiter Orbiting One of the Hottest and Brightest Known Exoplanet Host Stars |
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ERA Journal ID | 1048 |
Article Category | Article |
Authors | Addison, Brett C. (Author), Knudstrup, Emil (Author), Wong, Ian (Author), Hebrard, Guillaume (Author), Dorval, Patrick (Author), Snellen, Ignas (Author), Albrecht, Simon (Author), Bello-Arufe, Aaron (Author), Almenara, Jose-Manuel (Author), Boisse, Isabelle (Author), Bonfils, Xavier (Author), Dalal, Shweta (Author), Demangeon, Olivier D. S. (Author), Hoyer, Sergio (Author), Kiefer, Flavien (Author), Santos, N. C. (Author), Nowak, Grzegorz (Author), Luque, Rafael (Author), Stangret, Monika (Author), Palle, Enric (Author), Tronsgaard, Rene (Author), Antoci, Victoria (Author), Buchhave, Lars A. (Author), Gunther, Maximilian N. (Author), Daylan, Tansu (Author), Murgas, Felipe (Author), Parviainen, Hannu (Author), Esparza-Borges, Emma (Author), Crouzet, Nicolas (Author), Narita, Norio (Author), Fukui, Akihiko (Author), Kawauchi, Kiyoe (Author), Watanabe, Noriharu (Author), Rabus, Markus (Author), Johnson, Marshall C. (Author), Otten, Gilles P. P. L. (Author), Talens, Geert Jan (Author), Cabot, Samuel H. C. (Author), Fischer, Debra A. (Author), Grundahl, Frank (Author), Andersen, Mads Fredslund (Author), Jessen-Hansen, Jens (Author), Palle, Pere (Author), Shporer, Avi (Author), Ciardi, David R. (Author), Clark, Jake T. (Author), Wittenmyer, Robert A. (Author), Wright, Duncan J. (Author), Horner, Jonathan (Author), Collins, Karen A. (Author), Jensen, Eric L. N. (Author), Kielkopf, John F. (Author), Schwarz, Richard P. (Author), Srdoc, Gregor (Author), Yilmaz, Mesut (Author), Senavci, Hakan Volkan (Author), Diamond, Brendan (Author), Harbeck, Daniel (Author), Komacek, Thaddeus D. (Author), Smith, Jeffrey C. (Author), Wang, Songhu (Author), Eastman, Jason D. (Author), Stassun, Keivan G. (Author), Latham, David W. (Author), Vanderspek, Roland (Author), Seager, Sara (Author), Winn, Joshua N. (Author), Jenkins, Jon M. (Author), Louie, Dana R. (Author), Bouma, Luke G. (Author), Twicken, Joseph D. (Author), Levine, Alan M. (Author) and McLean, Brian (Author) |
Journal Title | The Astronomical Journal |
Journal Citation | 162 (6), pp. 1-29 |
Article Number | 292 |
Number of Pages | 29 |
Year | 2021 |
Publisher | IOP Publishing |
Place of Publication | United States |
ISSN | 0004-6256 |
1538-3881 | |
Digital Object Identifier (DOI) | https://doi.org/10.3847/1538-3881/ac224e |
Web Address (URL) | https://iopscience.iop.org/article/10.3847/1538-3881/ac224e |
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. |
Keywords | Exoplanets; Hot Jupiters; Transit photometry; Radial velocity |
Contains Sensitive Content | Does not contain sensitive content |
ANZSRC Field of Research 2020 | 510109. Stellar astronomy and planetary systems |
Public Notes | File reproduced in accordance with the copyright policy of the publisher/author. |
Institution of Origin | University of Southern Queensland |
Byline Affiliations | Centre for Astrophysics |
Aarhus University, Denmark | |
Massachusetts Institute of Technology, United States | |
Pierre and Marie Curie University, France | |
Leiden University, Netherlands | |
Technical University of Denmark, Denmark | |
Grenoble Alpes University, France | |
Aix-Marseille University, France | |
University of Porto, Portugal | |
Sorbonne University, France | |
Institute of Astrophysics of the Canary Islands, Spain | |
University of Denmark, Denmark | |
European Space Agency, France | |
University of Tokyo, Japan | |
Astrobiology Center, Japan | |
Catholic University of the Most Holy Conception (UCSC), Chile | |
Las Cumbres Observatory, United States | |
University of Montreal, Canada | |
Yale University, United States | |
National Aeronautics and Space Administration (NASA), United States | |
Center for Astrophysics Harvard and Smithsonian, United States | |
Swarthmore College, United States | |
School of Mathematics, Physics and Computing | |
Patashnick Voorheesville Observatory, United States | |
Kotizarovci Observatory, Croatia | |
Ankara University, Turkiye | |
Howard Community College, United States | |
University of Maryland, United States | |
NASA Ames Research Center, United States | |
Indiana University Bloomington, United States | |
Vanderbilt University, United States | |
Princeton University, United States | |
Space Telescope Science Institute, United States | |
Funding source | Australian Research Council (ARC) Grant ID DP180100972 |
https://research.usq.edu.au/item/q6yqx/toi-1431b-mascara-5b-a-highly-irradiated-ultrahot-jupiter-orbiting-one-of-the-hottest-and-brightest-known-exoplanet-host-stars
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