TESS Hunt for Young and Maturing Exoplanets (THYME) XI: An Earth-sized Planet Orbiting a Nearby, Solar-like Host in the 400Myr Ursa Major Moving Group
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| Auteurs principaux: | , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866916086611443712 |
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| author | Capistrant, Benjamin K. Soares-Furtado, Melinda Vanderburg, Andrew Jankowski, 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. Quinn, Samuel N. Seager, Sara Vanderspek, Roland K. Jenkins, Jon M. Kreidberg, Laura Latham, David W. Shporer, Avi Twicken, Joseph D. Wohler, Bill Yarza, Ricardo Ziegler, Carl |
| author_facet | Capistrant, Benjamin K. Soares-Furtado, Melinda Vanderburg, Andrew Jankowski, 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. Quinn, Samuel N. Seager, Sara Vanderspek, Roland K. Jenkins, Jon M. Kreidberg, Laura Latham, David W. Shporer, Avi Twicken, Joseph D. Wohler, Bill Yarza, Ricardo Ziegler, Carl |
| contents | Young terrestrial worlds are critical test beds to constrain prevailing theories of planetary formation and evolution. We present the discovery of HD 63433d - a nearby (22pc), Earth-sized planet transiting a young sunlike star (TOI-1726, HD 63433). HD 63433d 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 $\pm$ 23 Myr) Ursa Major moving group, whose membership we update using new data from Gaia DR3 and TESS. Our transit analysis of the TESS light curves indicates that HD 63433 d has a radius of 1.1 $R_\oplus$ 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 $\approx$ 6.9 mag) makes this transiting multiplanet system favorable to further investigations, including spectroscopic follow-up to probe atmospheric loss in a young Earth-sized world. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2401_04785 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | TESS Hunt for Young and Maturing Exoplanets (THYME) XI: An Earth-sized Planet Orbiting a Nearby, Solar-like Host in the 400Myr Ursa Major Moving Group Capistrant, Benjamin K. Soares-Furtado, Melinda Vanderburg, Andrew Jankowski, 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. Quinn, Samuel N. Seager, Sara Vanderspek, Roland K. Jenkins, Jon M. Kreidberg, Laura Latham, David W. Shporer, Avi Twicken, Joseph D. Wohler, Bill Yarza, Ricardo Ziegler, Carl Earth and Planetary Astrophysics Astrophysics of Galaxies Solar and Stellar Astrophysics Young terrestrial worlds are critical test beds to constrain prevailing theories of planetary formation and evolution. We present the discovery of HD 63433d - a nearby (22pc), Earth-sized planet transiting a young sunlike star (TOI-1726, HD 63433). HD 63433d 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 $\pm$ 23 Myr) Ursa Major moving group, whose membership we update using new data from Gaia DR3 and TESS. Our transit analysis of the TESS light curves indicates that HD 63433 d has a radius of 1.1 $R_\oplus$ 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 $\approx$ 6.9 mag) makes this transiting multiplanet system favorable to further investigations, including spectroscopic follow-up to probe atmospheric loss in a young Earth-sized world. |
| title | TESS Hunt for Young and Maturing Exoplanets (THYME) XI: An Earth-sized Planet Orbiting a Nearby, Solar-like Host in the 400Myr Ursa Major Moving Group |
| topic | Earth and Planetary Astrophysics Astrophysics of Galaxies Solar and Stellar Astrophysics |
| url | https://arxiv.org/abs/2401.04785 |