Two Young Planetary Systems around Field Stars with Ages between 20 and 320 Myr from TESS
Article
Article Title | Two Young Planetary Systems around Field Stars with Ages between 20 and 320 Myr from TESS |
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ERA Journal ID | 1048 |
Article Category | Article |
Authors | Zhou, George, Quinn, Samuel N. (Author), Irwin, Jonathan (Author), Huang, Chelsea X. (Author), Collins, Karen A. (Author), Bouma, Luke G. (Author), Khan, Lamisha (Author), Landrigan, Anaka (Author), Vanderburg, Andrew M. (Author), Rodriguez, Joseph E. (Author), Latham, David W. (Author), Torres, Guillermo (Author), Douglas, Stephanie T. (Author), Bieryla, Allyson (Author), Esquerdo, Gilbert A. (Author), Berlind, Perry (Author), Calkins, Michael L. (Author), Buchhave, Lars A. (Author), Charbonneau, David (Author), Collins, Kevin I. (Author), Kielkopf, John F. (Author), Jensen, Eric L. N. (Author), Tan, Thiam-Guan (Author), Hart, Rhodes (Author), Carter, Brad (Author), Stockdale, Christopher (Author), Ziegler, Carl (Author), Law, Nicholas (Author), Mann, Andrew W. (Author), Howell, Steve B. (Author), Matson, Rachel A. (Author), Scott, Nicholas J. (Author), Furlan, Elise (Author), White, Russel J. (Author), Hellier, Coel (Author), Anderson, David R. (Author), West, Richard G. (Author), Ricker, George (Author), Vanderspek, Roland (Author), Seager, Sara (Author), Jenkins, Jon M. (Author), Winn, Joshua N. (Author), Mireles, Ismael (Author), Rowden, Pamela (Author), Yahalomi, Daniel A. (Author), Wohler, Bill (Author), Brasseur, Clara. E. (Author), Daylan, Tansu (Author) and Colon, Knicole D. (Author) |
Journal Title | The Astronomical Journal |
Journal Citation | 161 (1) |
Article Number | 2 |
Number of Pages | 21 |
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/abba22 |
Web Address (URL) | https://iopscience.iop.org/article/10.3847/1538-3881/abba22 |
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. |
Keywords | Exoplanet evolution; Exoplanets; Astrophysics - Earth and Planetary Astrophysics; Astrophysics - Solar and Stellar Astrophysics |
Contains Sensitive Content | Does not contain sensitive content |
ANZSRC Field of Research 2020 | 510109. Stellar astronomy and planetary systems |
Public Notes | For access to this article, please click on the URL link provided. |
Institution of Origin | University of Southern Queensland |
Funder | Directorate for Mathematical and Physical Sciences |
Byline Affiliations | Center for Astrophysics Harvard and Smithsonian, United States |
Massachusetts Institute of Technology, United States | |
Princeton University, United States | |
University of Texas at Austin, United States | |
Technical University of Denmark, Denmark | |
George Mason University, United States | |
School of Mathematics, Physics and Computing | |
Swarthmore College, United States | |
Perth Exoplanet Survey Telescope Observatory, Australia | |
Centre for Astrophysics | |
Hazelwood Observatory, Australia | |
University of Toronto, Canada | |
University of North Carolina, United States | |
National Aeronautics and Space Administration (NASA), United States | |
NASA Ames Research Center, United States | |
California Institute of Technology (Caltech), United States | |
Keele University, United Kingdom | |
University of Warwick, United Kingdom | |
Open University, United Kingdom | |
Space Telescope Science Institute, United States | |
NASA Goddard Space Flight Center, United States |
https://research.usq.edu.au/item/q6x7w/two-young-planetary-systems-around-field-stars-with-ages-between-20-and-320-myr-from-tess
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