TESS Hunt for Young and Maturing Exoplanets (THYME). III. A Two-planet System in the 400 Myr Ursa Major Group
Article
Article Title | TESS Hunt for Young and Maturing Exoplanets (THYME). III. A Two-planet System in the 400 Myr Ursa Major Group |
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ERA Journal ID | 1048 |
Article Category | Article |
Authors | Mann, Andrew W. (Author), Johnson, Marshall C. (Author), Vanderburg, Andrew (Author), Kraus, Adam L. (Author), Rizzuto, Aaron C. (Author), Wood, Mackenna L. (Author), Bush, Jonathan L. (Author), Rockcliffe, Keighley (Author), Newton, Elisabeth R. (Author), Latham, David W. (Author), Mamajek, Eric E. (Author), Zhou, George (Author), Quinn, Samuel N. (Author), Thao, Pa Chia (Author), Benatti, Serena (Author), Cosentino, Rosario (Author), Desidera, Silvano (Author), Harutyunyan, Avet (Author), Lovis, Christophe (Author), Mortier, Annelies (Author), Pepe, Francesco A. (Author), Poretti, Ennio (Author), Wilson, Thomas G. (Author), Kristiansen, Martti H. (Author), Gagliano, Robert (Author), Jacobs, Thomas (Author), LaCourse, Daryll M. (Author), Omohundro, Mark (Author), Schwengeler, Hans Martin (Author), Terentev, Ivan A. (Author), Kane, Stephen R. (Author), Hill, Michelle L. (Author), Rabus, Markus (Author), Esquerdo, Gilbert A. (Author), Berlind, Perry (Author), Collins, Karen A. (Author), Murawski, Gabriel (Author), Sallam, Nezar Hazam (Author), Aitken, Michael M. (Author), Massey, Bob (Author), Ricker, George R. (Author), Vanderspek, Roland (Author), Seager, Sara (Author), Winn, Joshua N. (Author), Jenkins, Jon M. (Author), Barclay, Thomas (Author), Caldwell, Douglas A. (Author), Dragomir, Diana (Author), Doty, John P. (Author), Glidden, Ana (Author), Tenenbaum, Peter (Author), Torres, Guillermo (Author), Twicken, Joseph D. (Author) and Villanueva, Steven, Jr. (Author) |
Journal Title | The Astronomical Journal |
Journal Citation | 160 (4), pp. 1-18 |
Article Number | 179 |
Number of Pages | 18 |
Year | 2020 |
Publisher | IOP Publishing |
Place of Publication | United States |
ISSN | 0004-6256 |
1538-3881 | |
Digital Object Identifier (DOI) | https://doi.org/10.3847/1538-3881/abae64 |
Web Address (URL) | https://iopscience.iop.org/article/10.3847/1538-3881/abae64 |
Abstract | Exoplanets can evolve significantly between birth and maturity, as their atmospheres, orbits, and structures are shaped by their environment. Young planets (<1 Gyr) offer an opportunity to probe the critical early stages of this evolution, where planets evolve the fastest. However, most of the known young planets orbit prohibitively faint stars. We present the discovery of two planets transiting HD 63433 (TOI 1726, TIC 130181866), a young Sun-like star. Through kinematics, lithium abundance, and rotation, we confirm that HD 63433 is a member of the Ursa Major moving group (τ = 414 ± 23 Myr). Based on the TESS light curve and updated stellar parameters, we estimate that the planet radii are 2.15 ± 0.10 R ⊕ and 2.67 ± 0.12 R ⊕, the orbital periods are 7.11 and 20.55 days, and the orbital eccentricities are lower than about 0.2. Using High Accuracy Radial velocity Planet Searcher for the Northern hemisphere velocities, we measure the Rossiter-McLaughlin signal of the inner planet, demonstrating that the orbit is prograde. Since the host star is bright (V = 6.9), both planets are amenable to transmission spectroscopy, radial velocity measurements of their masses, and more precise determination of the stellar obliquity. This system is therefore poised to play an important role in our understanding of planetary system evolution in the first billion years after formation. |
Keywords | Young star clusters; Exoplanet evolution; Transits; Exoplanet; Stellar activity; Stellar rotation; Exoplanet dynamics; Astrophysics - Earth and Planetary; Astrophysics; Astrophysics - Solar and Stellar Astrophysics |
Article Publishing Charge (APC) Funding | Other |
Contains Sensitive Content | Does not contain sensitive content |
ANZSRC Field of Research 2020 | 510109. Stellar astronomy and planetary systems |
Public Notes | File reproduced in accordance with the copyright policy of the publisher/author. |
Institution of Origin | University of Southern Queensland |
Byline Affiliations | University of North Carolina, United States |
Las Cumbres Observatory, United States | |
University of Texas at Austin, United States | |
Dartmouth College, United States | |
Center for Astrophysics Harvard and Smithsonian, United States | |
California Institute of Technology (Caltech), United States | |
National Institute for Astrophysics, Italy | |
Institute of Astrophysics of the Canary Islands, Spain | |
University of Geneva, Switzerland | |
University of Cambridge, United Kingdom | |
University of St Andrews, United Kingdom | |
Technical University of Denmark, Denmark | |
No affiliation | |
University of Oxford, United Kingdom | |
University of California, United States | |
SOTES Private Observatory, Poland | |
World Wide Variable Star Hunters, United Arab Emirates | |
Villa ‘39 Observatory, United States | |
Massachusetts Institute of Technology, United States | |
Princeton University, United States | |
NASA Ames Research Center, United States | |
NASA Goddard Space Flight Center, United States | |
University of New Mexico, United States | |
Noqsi Aerospace, United States |
https://research.usq.edu.au/item/q6x50/tess-hunt-for-young-and-maturing-exoplanets-thyme-iii-a-two-planet-system-in-the-400-myr-ursa-major-group
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