TESS Hunt for Young and Maturing Exoplanets (THYME). XI. An Earth-sized Planet Orbiting a Nearby, Solar-like Host in the 400 Myr Ursa Major Moving Group
Article
Capistrant, Benjamin K., Soares-Furtado, Melinda, Vanderburg, Andrew, Jankowsk, Alyssa, Mann, Andrew W., Ross, Gabrielle, Srdoc, Gregor, Hinkel, Natalie R., Becker, Juliette, Magliano, Christian, Limbach, Mary Anne, Stephan, Alexander P., Nine, Andrew C., Tofflemire, Benjamin M., Kraus, Adam L., Giacalone, Steven, Winn, Joshua N., Bieryla, Allyson, Bouma, Luke G., ..., Ziegler, Carl. 2024. "TESS Hunt for Young and Maturing Exoplanets (THYME). XI. An Earth-sized Planet Orbiting a Nearby, Solar-like Host in the 400 Myr Ursa Major Moving Group." The Astronomical Journal. 167 (2). https://doi.org/10.3847/1538-3881/ad1039
Article Title | TESS Hunt for Young and Maturing Exoplanets (THYME). XI. An Earth-sized Planet Orbiting a Nearby, Solar-like Host in the 400 Myr Ursa Major Moving Group |
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ERA Journal ID | 1048 |
Article Category | Article |
Authors | Capistrant, Benjamin K., Soares-Furtado, Melinda, Vanderburg, Andrew, Jankowsk, Alyssa, Mann, Andrew W., Ross, Gabrielle, Srdoc, Gregor, Hinkel, Natalie R., Becker, Juliette, Magliano, Christian, Limbach, Mary Anne, Stephan, Alexander P., Nine, Andrew C., Tofflemire, Benjamin M., Kraus, Adam L., Giacalone, Steven, Winn, Joshua N., Bieryla, Allyson, Bouma, Luke G., Ciardi, David R., Collins, Karen A., Covone, Giovanni, de Beurs, Zoë L., Huang, Chelsea X., Jenkins, Jon M., Kreidberg, Laura, Latham, David W., Quinn, Samuel N., Seager, Sara, Shporer, Avi, Twicken, Joseph D., Wohler, Bill, Vanderspek, Roland K., Yarza, Ricardo and Ziegler, Carl |
Journal Title | The Astronomical Journal |
Journal Citation | 167 (2) |
Article Number | 54 |
Number of Pages | 18 |
Year | 2024 |
Publisher | IOP Publishing |
Place of Publication | United States |
ISSN | 0004-6256 |
1538-3881 | |
Digital Object Identifier (DOI) | https://doi.org/10.3847/1538-3881/ad1039 |
Web Address (URL) | https://iopscience.iop.org/article/10.3847/1538-3881/ad1039 |
Abstract | Young terrestrial worlds are critical test beds to constrain prevailing theories of planetary formation and evolution. We present the discovery of HD 63433 d—a nearby (22 pc), Earth-sized planet transiting a young Sun-like star (TOI-1726, HD 63433). HD 63433 d is the third planet detected in this multiplanet system. The kinematic, rotational, and abundance properties of the host star indicate that it belongs to the young (414 ± 23 Myr) Ursa Major moving group, whose membership we update using new data from the third data release of the Gaia mission and TESS. Our transit analysis of the TESS light curves indicates that HD 63433 d has a radius of 1.1 R⊕ and closely orbits its host star with a period of 4.2 days. To date, HD 63433 d is the smallest confirmed exoplanet with an age less than 500 Myr, and the nearest young Earth-sized planet. Furthermore, the apparent brightness of the stellar host (V ≃ 6.9 mag) makes this transiting multiplanet system favorable to further investigations, including spectroscopic follow-up to probe the atmospheric loss in a young Earth-sized world. |
Keywords | Exoplanet systems |
Contains Sensitive Content | Does not contain sensitive content |
ANZSRC Field of Research 2020 | 5101. Astronomical sciences |
Byline Affiliations | University of Florida, United States |
University of Wisconsin-Madison, United States | |
Massachusetts Institute of Technology, United States | |
University of North Carolina, United States | |
Princeton University, United States | |
Kotizarovci Observatory, Croatia | |
Louisiana State University, United States | |
Southwest Research Institute, United States | |
University of Naples Federico II, Italy | |
University of Michigan, United States | |
Ohio State University, United States | |
University of Texas at Austin, United States | |
University of California Berkeley, United States | |
Center for Astrophysics Harvard and Smithsonian, United States | |
California Institute of Technology (Caltech), United States | |
Centre for Astrophysics | |
NASA Ames Research Center, United States | |
Max Planck Institute for Astronomy, Germany | |
SETI Institute, United States | |
University of California Santa Cruz, United States | |
University of Texas, United States | |
Stephen F. Austin State University, United States |
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