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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/2405.13118 |
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| _version_ | 1866910455294853120 |
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| author | Dholakia, Shishir Palethorpe, Larissa Venner, Alexander Mortier, Annelies Wilson, Thomas G. Huang, Chelsea X. Rice, Ken Van Eylen, Vincent Nabbie, Emma Cloutier, Ryan Boschin, Walter Ciardi, David Delrez, Laetitia Dransfield, Georgina Ducrot, Elsa Essack, Zahra Everett, Mark E. Gillon, Michaël Hooton, Matthew J. Kunimoto, Michelle Latham, David W. López-Morales, Mercedes Li, Bin Li, Fan McDermott, Scott Murphy, Simon Murray, Catriona A. Seager, Sara Timmermans, Mathilde Triaud, Amaury Turner, Daisy A. Twicken, Joseph D. Vanderburg, Andrew Wang, Su Wittenmyer, Robert A. Wright, Duncan |
| author_facet | Dholakia, Shishir Palethorpe, Larissa Venner, Alexander Mortier, Annelies Wilson, Thomas G. Huang, Chelsea X. Rice, Ken Van Eylen, Vincent Nabbie, Emma Cloutier, Ryan Boschin, Walter Ciardi, David Delrez, Laetitia Dransfield, Georgina Ducrot, Elsa Essack, Zahra Everett, Mark E. Gillon, Michaël Hooton, Matthew J. Kunimoto, Michelle Latham, David W. López-Morales, Mercedes Li, Bin Li, Fan McDermott, Scott Murphy, Simon Murray, Catriona A. Seager, Sara Timmermans, Mathilde Triaud, Amaury Turner, Daisy A. Twicken, Joseph D. Vanderburg, Andrew Wang, Su Wittenmyer, Robert A. Wright, Duncan |
| contents | We report on the discovery of Gliese 12 b, the nearest transiting temperate, Earth-sized planet found to date. Gliese 12 is a bright ($V=12.6$ mag, $K=7.8$ mag) metal-poor M4V star only $12.162\pm0.005$ pc away from the Solar System with one of the lowest stellar activity levels known for an M-dwarf. A planet candidate was detected by TESS based on only 3 transits in sectors 42, 43, and 57, with an ambiguity in the orbital period due to observational gaps. We performed follow-up transit observations with CHEOPS and ground-based photometry with MINERVA-Australis, SPECULOOS, and Purple Mountain Observatory, as well as further TESS observations in sector 70. We statistically validate Gliese 12 b as a planet with an orbital period of $12.76144\pm0.00006$ days and a radius of $1.0\pm{0.1}$ R$_\oplus$, resulting in an equilibrium temperature of $\sim$315K. Gliese 12 b has excellent future prospects for precise mass measurement, which may inform how planetary internal structure is affected by the stellar compositional environment. Gliese 12 b also represents one of the best targets to study whether Earth-like planets orbiting cool stars can retain their atmospheres, a crucial step to advance our understanding of habitability on Earth and across the Galaxy. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2405_13118 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Gliese 12 b, A Temperate Earth-sized Planet at 12 Parsecs Discovered with TESS and CHEOPS Dholakia, Shishir Palethorpe, Larissa Venner, Alexander Mortier, Annelies Wilson, Thomas G. Huang, Chelsea X. Rice, Ken Van Eylen, Vincent Nabbie, Emma Cloutier, Ryan Boschin, Walter Ciardi, David Delrez, Laetitia Dransfield, Georgina Ducrot, Elsa Essack, Zahra Everett, Mark E. Gillon, Michaël Hooton, Matthew J. Kunimoto, Michelle Latham, David W. López-Morales, Mercedes Li, Bin Li, Fan McDermott, Scott Murphy, Simon Murray, Catriona A. Seager, Sara Timmermans, Mathilde Triaud, Amaury Turner, Daisy A. Twicken, Joseph D. Vanderburg, Andrew Wang, Su Wittenmyer, Robert A. Wright, Duncan Earth and Planetary Astrophysics We report on the discovery of Gliese 12 b, the nearest transiting temperate, Earth-sized planet found to date. Gliese 12 is a bright ($V=12.6$ mag, $K=7.8$ mag) metal-poor M4V star only $12.162\pm0.005$ pc away from the Solar System with one of the lowest stellar activity levels known for an M-dwarf. A planet candidate was detected by TESS based on only 3 transits in sectors 42, 43, and 57, with an ambiguity in the orbital period due to observational gaps. We performed follow-up transit observations with CHEOPS and ground-based photometry with MINERVA-Australis, SPECULOOS, and Purple Mountain Observatory, as well as further TESS observations in sector 70. We statistically validate Gliese 12 b as a planet with an orbital period of $12.76144\pm0.00006$ days and a radius of $1.0\pm{0.1}$ R$_\oplus$, resulting in an equilibrium temperature of $\sim$315K. Gliese 12 b has excellent future prospects for precise mass measurement, which may inform how planetary internal structure is affected by the stellar compositional environment. Gliese 12 b also represents one of the best targets to study whether Earth-like planets orbiting cool stars can retain their atmospheres, a crucial step to advance our understanding of habitability on Earth and across the Galaxy. |
| title | Gliese 12 b, A Temperate Earth-sized Planet at 12 Parsecs Discovered with TESS and CHEOPS |
| topic | Earth and Planetary Astrophysics |
| url | https://arxiv.org/abs/2405.13118 |