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

George Zhou*, Samuel N. Quinn, Jonathan Irwin, Chelsea X. Huang, Karen A. Collins, Luke G. Bouma, Lamisha Khan, Anaka Landrigan, Andrew M. Vanderburg, Joseph E. Rodriguez, David W. Latham, Guillermo Torres, Stephanie T. Douglas, Allyson Bieryla, Gilbert A. Esquerdo, Perry Berlind, Michael L. Calkins, Lars A. Buchhave, David Charbonneau, Kevin I. CollinsJohn F. Kielkopf, Eric L. N. Jensen, Thiam-Guan Tan, Rhodes Hart, Brad Carter, Christopher Stockdale, Carl Ziegler, Nicholas Law, Andrew W. Mann, Steve B. Howell, Rachel A. Matson, Nicholas J. Scott, Elise Furlan, Russel J. White, Coel Hellier, David R. Anderson, Richard G. West, George Ricker, Roland Vanderspek, Sara Seager, Jon M. Jenkins, Joshua N. Winn, Ismael Mireles, Pamela Rowden, Daniel A. Yahalomi, Bill Wohler, Clara. E. Brasseur, Tansu Daylan, Knicole D. Colón

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Planets around young stars trace the early evolution of planetary systems. We report the discovery and validation of two planetary systems with ages 300 Myr from observations by the Transiting Exoplanet Survey Satellite (TESS). The Myr old G star TOI-251 hosts a mini-Neptune with a day period. The Myr old K star TOI-942 hosts a system of inflated Neptune-sized planets, with TOI-942b orbiting in a period of days with a radius of and TOI-942c orbiting in a period of days with a radius of . 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.
Original languageEnglish
Article number2
JournalAstrophysical Journal
Volume161
Issue number1
Number of pages21
ISSN0004-637X
DOIs
Publication statusPublished - 2021

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