No Thick Atmosphere on the Terrestrial Exoplanet Gl 486b
| Autor: | Megan Weiner Mansfield, Qiao Xue, Michael Zhang, Alexandra S. Mahajan, Jegug Ih, Daniel Koll, Jacob L. Bean, Brandon Park Coy, Jason D. Eastman, Eliza M.-R. Kempton, Edwin S. Kite |
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| Jazyk: | angličtina |
| Rok vydání: | 2024 |
| Předmět: | |
| Zdroj: | The Astrophysical Journal Letters, Vol 975, Iss 1, p L22 (2024) |
| Druh dokumentu: | article |
| ISSN: | 2041-8213 2041-8205 |
| DOI: | 10.3847/2041-8213/ad8161 |
| Popis: | A primary science goal for JWST is to detect and characterize the atmospheres of terrestrial planets orbiting M dwarfs (M-Earths). The existence of atmospheres on M-Earths is highly uncertain because their host stars’ extended history of high X-ray and ultraviolet irradiation may act to completely remove their atmospheres. We present two JWST secondary eclipse observations of the M-Earth Gl 486b (also known as GJ 486b) between 5 and 12 μ m. We combined these observations with a precise analysis of the host star parameters to derive a planetary dayside temperature of T _p = 865 ± 14 K. We compared this temperature to the maximum expected temperature for a zero albedo, zero heat redistribution bare rock and derived a temperature ratio of ${ \mathcal R }=\frac{{T}_{{\rm{p}},{\rm{dayside}}}}{{T}_{{\rm{p}},{\rm{\max }}}}=0.97\pm 0.01$ . This value is consistent with an airless body with a slight nonzero albedo or a thin atmosphere with |
| Databáze: | Directory of Open Access Journals |
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