TESS Hunt for Young and Maturing Exoplanets (THYME). IV. Three Small Planets Orbiting a 120 Myr Old Star in the Pisces–Eridanus Stream

Newton, Elisabeth R. and Mann, Andrew W. and Kraus, Adam L. and Livingston, John H. and Vanderburg, Andrew and Curtis, Jason L. and Thao, Pa Chia and Hawkins, Keith and Wood, Mackenna L. and Rizzuto, Aaron C. and Soubkiou, Abderahmane and Tofflemire, Benjamin M. and Zhou, George ORCID: https://orcid.org/0000-0002-4891-3517 and Crossfield, Ian J. M. and Pearce, Logan A. and Collins, Karen A. and Conti, Dennis M. and Tan, Thiam-Guan and Villeneuva, Steven and Spencer, Alton and Dragomir, Diana and Quinn, Samuel N. and Jensen, Eric L. N. and Collins, Kevin I. and Stockdale, Chris and Cloutier, Ryan and Hellier, Coel and Benkhaldoun, Zouhair and Ziegler, Carl and Briceno, Cesar and Law, Nicholas and Benneke, Bjorn and Christiansen, Jessie L. and Gorjian, Varoujan and Kane, Stephen R. and Kreidberg, Laura and Morales, Farisa Y. and Werner, Michael W. and Twicken, Joseph D. and Levine, Alan M. and Ciardi, David R. and Guerrero, Natalia M. and Hesse, Katharine and Quintana, Elisa V. and Shiao, Bernie and Smith, Jeffrey C. and Torres, Guillermo and Ricker, George R. and Vanderspek, Roland and Seager, Sara and Winn, Joshua N. and Jenkins, Jon M. and Latham, David W. (2021) TESS Hunt for Young and Maturing Exoplanets (THYME). IV. Three Small Planets Orbiting a 120 Myr Old Star in the Pisces–Eridanus Stream. The Astronomical Journal, 161 (2):65. pp. 1-20. ISSN 0004-6256


Young exoplanets can offer insight into the evolution of planetary atmospheres, compositions, and architectures. We present the discovery of the young planetary system TOI 451 (TIC 257605131, Gaia DR2 4844691297067063424). TOI 451 is a member of the 120 Myr old Pisces-Eridanus stream (Psc-Eri). We confirm membership in the stream with its kinematics, its lithium abundance, and the rotation and UV excesses of both TOI 451 and its wide-binary companion, TOI 451 B (itself likely anM-dwarf binary).We identified three candidate planets transiting in the Transiting Exoplanet Survey Satellite data and followed up the signals with photometry from Spitzer and ground-based telescopes. The system comprises three validated planets at periods of 1.9, 9.2, and 16 days, with radii of 1.9, 3.1, and 4.1 R⊗, respectively. The host star is near-solar mass with V=11.0 and H = 9.3 and displays an infrared excess indicative of a debris disk. The planets offer excellent prospects for transmission spectroscopy with the Hubble Space Telescope and the James Webb Space Telescope, providing the opportunity to study planetary atmospheres that may still be in the process of evolving.

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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: 07 Mar 2022 04:33
Last Modified: 30 Mar 2022 03:53
Uncontrolled Keywords: Exoplanet astronomy; Exoplanet evolution; Exoplanet systems; Young; star clusters; Stellar activity; Astrophysics - Earth and Planetary Astrophysics; Astrophysics - Solar and Stellar Astrophysics
Fields of Research (2020): 51 PHYSICAL SCIENCES > 5101 Astronomical sciences > 510109 Stellar astronomy and planetary systems
Socio-Economic Objectives (2020): 28 EXPANDING KNOWLEDGE > 2801 Expanding knowledge > 280120 Expanding knowledge in the physical sciences
Identification Number or DOI: https://doi.org/10.3847/1538-3881/abccc6
URI: http://eprints.usq.edu.au/id/eprint/45015

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