Coel Hellier c.hellier@keele.ac.uk
Two Young Planetary Systems around Field Stars with Ages between 20 and 320 Myr from TESS
Hellier
Authors
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.
Acceptance Date | Sep 19, 2020 |
---|---|
Publication Date | Dec 2, 2020 |
Publicly Available Date | Mar 28, 2024 |
Journal | Astronomical Journal |
Print ISSN | 0004-6256 |
Publisher | American Astronomical Society |
Pages | 2 - 2 |
DOI | https://doi.org/10.3847/1538-3881/abba22 |
Publisher URL | https://doi.org/10.3847/1538-3881/abba22 |
Files
Zhou_2021_AJ_161_2.pdf
(14.7 Mb)
PDF
You might also like
A Mini-Neptune Orbiting the Metal-poor K Dwarf BD+29 2654
(2023)
Journal Article
Radial-velocity discovery of a second planet in the TOI-1338/BEBOP-1 circumbinary system
(2023)
Journal Article
The TESS Grand Unified Hot Jupiter Survey. II. Twenty New Giant Planets*
(2023)
Journal Article
TOI-4562b: A Highly Eccentric Temperate Jupiter Analog Orbiting a Young Field Star
(2023)
Journal Article
TOI-969: a late-K dwarf with a hot mini-Neptune in the desert and an eccentric cold Jupiter
(2023)
Journal Article
Downloadable Citations
About Keele Repository
Administrator e-mail: research.openaccess@keele.ac.uk
This application uses the following open-source libraries:
SheetJS Community Edition
Apache License Version 2.0 (http://www.apache.org/licenses/)
PDF.js
Apache License Version 2.0 (http://www.apache.org/licenses/)
Font Awesome
SIL OFL 1.1 (http://scripts.sil.org/OFL)
MIT License (http://opensource.org/licenses/mit-license.html)
CC BY 3.0 ( http://creativecommons.org/licenses/by/3.0/)
Powered by Worktribe © 2024
Advanced Search