Two Young Planetary Systems around Field Stars with Ages between 20 and 320Myr from TESS

Zhou, George ORCID: https://orcid.org/0000-0002-4891-3517 and Quinn, Samuel N. and Irwin, Jonathan and Huang, Chelsea X. ORCID: https://orcid.org/0000-0003-0918-7484 and Collins, Karen A. and Bouma, Luke G. and Khan, Lamisha and Landrigan, Anaka and Vanderburg, Andrew M. and Rodriguez, Joseph E. and Latham, David W. and Torres, Guillermo and Douglas, Stephanie T. and Bieryla, Allyson and Esquerdo, Gilbert A. and Berlind, Perry and Calkins, Michael L. and Buchhave, Lars A. and Charbonneau, David and Collins, Kevin I. and Kielkopf, John F. and Jensen, Eric L. N. and Tan, Thiam-Guan and Hart, Rhodes and Carter, Brad ORCID: https://orcid.org/0000-0003-0035-8769 and Stockdale, Christopher and Ziegler, Carl and Law, Nicholas and Mann, Andrew W. and Howell, Steve B. and Matson, Rachel A. and Scott, Nicholas J. and Furlan, Elise and White, Russel J. and Hellier, Coel and Anderson, David R. and West, Richard G. and Ricker, George and Vanderspek, Roland and Seager, Sara and Jenkins, Jon M. and Winn, Joshua N. and Mireles, Ismael and Rowden, Pamela and Yahalomi, Daniel A. and Wohler, Bill and Brasseur, Clara. E. and Daylan, Tansu and Colon, Knicole D. (2020) Two Young Planetary Systems around Field Stars with Ages between 20 and 320Myr from TESS. The Astronomical Journal, 161 (1):2. pp. 1-21. ISSN 0004-6256


Abstract

Planets around young stars trace the early evolution of planetary systems. We report the discovery and validation of two planetary systems with ages <∼300Myr from observations by the Transiting Exoplanet Survey Satellite (TESS). The 40 V320 Myr old G star TOI-251 hosts a 2.74+0.18-0.18 mini-Neptune with a 4.94 day period. The 20-160 Myr old K star TOI-942 hosts a system of inflated Neptune-sized planets, with TOI-942b orbiting in a period of 4.32 days with a radius of 4.81+0.20-0.20 and TOI-942c orbiting in a period of 10.16 days with a radius of 5.79-0.18+0.19 Though we cannot place either host star into a known stellar association or cluster, we can estimate their ages via their photometric and spectroscopic properties. Both stars exhibit significant photometric variability due to spot modulation, with measured rotation periods of .3.5 days. These stars also exhibit significant chromospheric activity, with age estimates from the chromospheric calcium emission lines and X-ray fluxes matching that estimated from gyrochronology. Both stars also exhibit significant lithium absorption, similar in equivalent width to well-characterized young cluster members. TESS has the potential to deliver a population of young planet-bearing field stars, contributing significantly to tracing the properties of planets as a function of their age.


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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: 07 Mar 2022 04:39
Last Modified: 28 Mar 2022 03:29
Uncontrolled Keywords: Exoplanet evolution; Exoplanets; 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/abba22
URI: http://eprints.usq.edu.au/id/eprint/45053

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