TOI-824 b: A New Planet on the Lower Edge of the Hot Neptune Desert

Burt, Jennifer A. and Nielsen, Louise D. and Quinn, Samuel N. and Mamajek, Eric E. and Matthews, Elisabeth C. and Zhou, George ORCID: and Seidel, Julia V. and Huang, Chelsea X. ORCID: and Lopez, Eric and Soto, Maritza and Otegi, Jon and Stassun, Keivan G. and Kreidberg, Laura and Collins, Karen A. and Eastman, Jason D. and Rodriguez, Joseph E. and Vanderburg, Andrew and Halverson, Samuel P. and Teske, Johanna K. and Wang, Sharon X. and Butler, R. Paul and Bouchy, Francois and Dumusque, Xavier and Segransen, Damien and Shectman, Stephen A. and Crane, Jeffrey D. and Feng, Fabo and Montet, Benjamin T. and Feinstein, Adina D. and Beletski, Yuri and Flowers, Erin and Gunther, Maximilian N. and Daylan, Tansu and Collins, Kevin I. and Conti, Dennis M. and Gan, Tianjun and Jensen, Eric L. N. and Kielkopf, John F. and Tan, Thiam-Guan and Helled, Ravit and Dorn, Caroline and Haldemann, Jonas and Lissauer, Jack J. and Ricker, George R. and Vanderspek, Roland and Latham, David W. and Seager, S. and Winn, Joshua N. and Jenkins, Jon M. and Twicken, Joseph D. and Smith, Jeffrey C. and Tenenbaum, Peter and Cartwright, Scott and Barclay, Thomas and Pepper, Joshua and Esquerdo, Gilbert and Fong, William (2020) TOI-824 b: A New Planet on the Lower Edge of the Hot Neptune Desert. The Astronomical Journal, 160 (4):153. pp. 1-16. ISSN 0004-6256

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We report the detection of a transiting hot Neptune exoplanet orbiting TOI-824 (SCR J1448-5735), a nearby (d = 64 pc) K4V star, using data from the Transiting Exoplanet Survey Satellite. The newly discovered planet has a radius R p = 2.93 ± 0.20 R⊕ and an orbital period of 1.393 days. Radial velocity measurements using the Planet Finder Spectrograph and the High Accuracy Radial velocity Planet Searcher spectrograph confirm the existence of the planet, and we estimate its mass to be 18.47 ± 1.84 M⊕. The planet's mean density is ρp = 4.03-0.78+0.98 g cm-3, making it more than twice as dense as Neptune. TOI-824 b's high equilibrium temperature makes the planet likely to have a cloud-free atmosphere, and thus it is an excellent candidate for follow-up atmospheric studies. The detectability of TOI-824 b's atmosphere from both ground and space is promising and could lead to the detailed characterization of the most irradiated small planet at the edge of the hot Neptune desert that has retained its atmosphere to date.

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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Faculty/School / Institute/Centre: No Faculty
Faculty/School / Institute/Centre: No Faculty
Date Deposited: 14 Feb 2022 02:54
Last Modified: 15 Feb 2022 23:48
Uncontrolled Keywords: Exoplanet astronomy; Exoplanet detection methods; Exoplanets; Transit photometry; Radial velocity; Stellar properties; Astrophysics - Earth and Planetary Astrophysics; Astrophysics - Solar and Stellar Astrophysics
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
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