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| Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
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| Format: | Preprint |
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2024
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2407.18199 |
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| _version_ | 1866929437280305152 |
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| author | Tey, Evan Shporer, Avi Lin, Zifan Stassun, Keivan G. Lissauer, Jack J. Hellier, Coel Collins, Karen A. Collins, Kevin I. Wingham, Geof Relles, Howard M. Mallia, Franco Isopi, Giovanni Kielkopf, John F. Conti, Dennis M. Schwarz, Richard P. Zapparata, Aldo Giacalone, Steven Furlan, Elise Hartman, Zachary D. Howell, Steve B. Scott, Nicholas J. Ziegler, Carl Briceno, Cesar Law, Nicholas Mann, Andrew W. Charbonneau, David Essack, Zahra Striegel, Stephanie Ricker, George R. Vanderspek, Roland Seager, Sara Winn, Joshua N. Jenkins, Jon M. |
| author_facet | Tey, Evan Shporer, Avi Lin, Zifan Stassun, Keivan G. Lissauer, Jack J. Hellier, Coel Collins, Karen A. Collins, Kevin I. Wingham, Geof Relles, Howard M. Mallia, Franco Isopi, Giovanni Kielkopf, John F. Conti, Dennis M. Schwarz, Richard P. Zapparata, Aldo Giacalone, Steven Furlan, Elise Hartman, Zachary D. Howell, Steve B. Scott, Nicholas J. Ziegler, Carl Briceno, Cesar Law, Nicholas Mann, Andrew W. Charbonneau, David Essack, Zahra Striegel, Stephanie Ricker, George R. Vanderspek, Roland Seager, Sara Winn, Joshua N. Jenkins, Jon M. |
| contents | We report the discovery of the transiting planet GJ 238 b, with a radius of $0.566\pm0.014$ R$_{\oplus}$ ($1.064\pm0.026$ times the radius of Mars) and an orbital period of 1.74 day. The transit signal was detected by the TESS mission and designated TOI-486.01. The star's position close to the Southern ecliptic pole allows for almost continuous observations by TESS when it is observing the Southern sky. The host star is an M2.5 dwarf with $V=11.57\pm0.02$ mag, $K=7.030\pm0.023$ mag, a distance of $15.2156\pm0.0030$ pc, a mass of $0.4193_{-0.0098}^{+0.0095}$ M$_{\odot}$, a radius of $0.4314_{-0.0071}^{+0.0075}$ R$_{\odot}$, and an effective temperature of $3{,}485\pm140$ K. We validate the planet candidate by ruling out or rendering highly unlikely each of the false positive scenarios, based on archival data and ground-based follow-up observations. Validation was facilitated by the host star's small size and high proper motion, of $892.633\pm0.025$ mas yr$^{-1}$. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2407_18199 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | GJ 238 b: A 0.57 Earth Radius Planet Orbiting an M2.5 Dwarf Star at 15.2 pc Tey, Evan Shporer, Avi Lin, Zifan Stassun, Keivan G. Lissauer, Jack J. Hellier, Coel Collins, Karen A. Collins, Kevin I. Wingham, Geof Relles, Howard M. Mallia, Franco Isopi, Giovanni Kielkopf, John F. Conti, Dennis M. Schwarz, Richard P. Zapparata, Aldo Giacalone, Steven Furlan, Elise Hartman, Zachary D. Howell, Steve B. Scott, Nicholas J. Ziegler, Carl Briceno, Cesar Law, Nicholas Mann, Andrew W. Charbonneau, David Essack, Zahra Striegel, Stephanie Ricker, George R. Vanderspek, Roland Seager, Sara Winn, Joshua N. Jenkins, Jon M. Earth and Planetary Astrophysics We report the discovery of the transiting planet GJ 238 b, with a radius of $0.566\pm0.014$ R$_{\oplus}$ ($1.064\pm0.026$ times the radius of Mars) and an orbital period of 1.74 day. The transit signal was detected by the TESS mission and designated TOI-486.01. The star's position close to the Southern ecliptic pole allows for almost continuous observations by TESS when it is observing the Southern sky. The host star is an M2.5 dwarf with $V=11.57\pm0.02$ mag, $K=7.030\pm0.023$ mag, a distance of $15.2156\pm0.0030$ pc, a mass of $0.4193_{-0.0098}^{+0.0095}$ M$_{\odot}$, a radius of $0.4314_{-0.0071}^{+0.0075}$ R$_{\odot}$, and an effective temperature of $3{,}485\pm140$ K. We validate the planet candidate by ruling out or rendering highly unlikely each of the false positive scenarios, based on archival data and ground-based follow-up observations. Validation was facilitated by the host star's small size and high proper motion, of $892.633\pm0.025$ mas yr$^{-1}$. |
| title | GJ 238 b: A 0.57 Earth Radius Planet Orbiting an M2.5 Dwarf Star at 15.2 pc |
| topic | Earth and Planetary Astrophysics |
| url | https://arxiv.org/abs/2407.18199 |