TESS Hunt for Young and Maturing Exoplanets (THYME). V. A Sub-Neptune Transiting a Young Star in a Newly Discovered 250Myr Association
Article
Article Title | TESS Hunt for Young and Maturing Exoplanets (THYME). V. A Sub-Neptune Transiting a Young Star in a Newly Discovered 250Myr Association |
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ERA Journal ID | 1048 |
Article Category | Article |
Authors | Tofflemire, Benjamin M. (Author), Rizzuto, Aaron C. (Author), Newton, Elisabeth R. (Author), Kraus, Adam L. (Author), Mann, Andrew W. (Author), Vanderburg, Andrew (Author), Nelson, Tyler (Author), Hawkins, Keith (Author), Wood, Mackenna L. (Author), Zhou, George (Author), Quinn, Samuel N. (Author), Howell, Steve B. (Author), Collins, Karen A. (Author), Schwarz, Richard P. (Author), Stassun, Keivan G. (Author), Bouma, Luke G. (Author), Essack, Zahra (Author), Osborn, Hugh (Author), Boyd, Patricia T. (Author), Furesz, Gabor (Author), Glidden, Ana (Author), Twicken, Joseph D. (Author), Wohler, Bill (Author), McLean, Brian (Author), Ricker, George R. (Author), Vanderspek, Roland (Author), Latham, David W. (Author), Seager, S. (Author), Winn, Joshua N. (Author) and Jenkins, Jon M. (Author) |
Journal Title | The Astronomical Journal |
Journal Citation | 161 (4), pp. 1-32 |
Article Number | 171 |
Number of Pages | 32 |
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/abdf53 |
Web Address (URL) | https://iopscience.iop.org/article/10.3847/1538-3881/abdf53 |
Abstract | The detection and characterization of young planetary systems offer a direct path to study the processes that shape planet evolution. We report on the discovery of a sub-Neptune-sized planet orbiting the young star HD 110082 (TOI-1098). Transit events we initially detected during TESS Cycle 1 are validated with time-series photometry from Spitzer. High-contrast imaging and high-resolution, optical spectra are also obtained to characterize the stellar host and confirm the planetary nature of the transits. The host star is a late-F dwarf (Må = 1.2Me) with a low-mass, M dwarf binary companion (Må = 0.26Me) separated by nearly one arcminute (∼6200 au). Based on its rapid rotation and Lithium absorption, HD 110082 is young, but is not a member of any known group of young stars (despite proximity to the Octans association). To measure the age of the system, we search for coeval, phase-space neighbors and compile a sample of candidate siblings to compare with the empirical sequences of young clusters and to apply quantitative age-dating techniques. In doing so, we find that HD 110082 resides in a new young stellar association we designate MELANGE-1, with an age of 250-+7050 Myr. Jointly modeling the TESS and Spitzer light curves, we measure a planetary orbital period of 10.1827 days and radius of Rp = 3.2 ± 0.1R+. HD 110082 b’s radius falls in the largest 12% of field-age systems with similar host-star mass and orbital period. This finding supports previous studies indicating that young planets have larger radii than their field-age counterparts. |
Keywords | Exoplanet astronomy; Exoplanets; Mini Neptunes; Stellar astronomy; Wide binary stars; Moving clusters; Stellar ages; Transits; 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 |
Byline Affiliations | University of Texas at Austin, United States |
Dartmouth College, United States | |
University of North Carolina, United States | |
Center for Astrophysics Harvard and Smithsonian, United States | |
National Aeronautics and Space Administration (NASA), United States | |
Patashnick Voorheesville Observatory, United States | |
Vanderbilt University, United States | |
Princeton University, United States | |
Massachusetts Institute of Technology, United States | |
NASA Goddard Space Flight Center, United States | |
NASA Ames Research Center, United States | |
Mikulski Archive for Space Telescopes, United States | |
Harvard-Smithsonian Centre for Astrophysics, United States | |
Funding source | Australian Research Council (ARC) Grant ID DE210101893 |
https://research.usq.edu.au/item/q6x68/tess-hunt-for-young-and-maturing-exoplanets-thyme-v-a-sub-neptune-transiting-a-young-star-in-a-newly-discovered-250myr-association
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