Clouds and Hazes in GJ 1214b's Metal-Rich Atmosphere
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arXiv
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| Auteurs principaux: | , , , , , , , , , , , , |
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| Format: | Preprint |
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2025
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| author | Malsky, Isaac Rauscher, Emily Stevenson, Kevin Savel, Arjun B. Steinrueck, Maria E. Gao, Peter Kempton, Eliza M. -R. Roman, Michael T. Bean, Jacob L. Zhang, Michael Parmentier, Vivien Piette, Anjali A. A. Kataria, Tiffany |
| author_facet | Malsky, Isaac Rauscher, Emily Stevenson, Kevin Savel, Arjun B. Steinrueck, Maria E. Gao, Peter Kempton, Eliza M. -R. Roman, Michael T. Bean, Jacob L. Zhang, Michael Parmentier, Vivien Piette, Anjali A. A. Kataria, Tiffany |
| contents | The sub-Neptune GJ 1214b has an infamously flat transmission spectrum, likely due to thick aerosols in its atmosphere. A recent JWST MIRI spectroscopic phase curve of GJ 1214 b added to this picture, suggesting a highly reflective and metal-rich atmosphere. Using a 3D General Circulation Model with both photochemical hazes and condensate clouds, we characterize how different aerosol types affect the atmospheric structure of GJ 1214 b and manifest in its spectroscopic phase curve. Additionally, we reanalyze the original GJ 1214 b JWST phase curve. The reanalysis shows a hotter nightside, similar dayside temperature, and a lower, but still elevated, Bond albedo (0.42 +/- 0.11) than the original results. We find that a scenario with both clouds and hazes is most consistent with the JWST phase curve. Reflective clouds or hazes are needed to explain the large Bond albedo, and hazes or a super-solar metallicity help account for the several hundred Kelvin day-night temperature difference measured by the phase curve. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2503_22608 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Clouds and Hazes in GJ 1214b's Metal-Rich Atmosphere Malsky, Isaac Rauscher, Emily Stevenson, Kevin Savel, Arjun B. Steinrueck, Maria E. Gao, Peter Kempton, Eliza M. -R. Roman, Michael T. Bean, Jacob L. Zhang, Michael Parmentier, Vivien Piette, Anjali A. A. Kataria, Tiffany Earth and Planetary Astrophysics The sub-Neptune GJ 1214b has an infamously flat transmission spectrum, likely due to thick aerosols in its atmosphere. A recent JWST MIRI spectroscopic phase curve of GJ 1214 b added to this picture, suggesting a highly reflective and metal-rich atmosphere. Using a 3D General Circulation Model with both photochemical hazes and condensate clouds, we characterize how different aerosol types affect the atmospheric structure of GJ 1214 b and manifest in its spectroscopic phase curve. Additionally, we reanalyze the original GJ 1214 b JWST phase curve. The reanalysis shows a hotter nightside, similar dayside temperature, and a lower, but still elevated, Bond albedo (0.42 +/- 0.11) than the original results. We find that a scenario with both clouds and hazes is most consistent with the JWST phase curve. Reflective clouds or hazes are needed to explain the large Bond albedo, and hazes or a super-solar metallicity help account for the several hundred Kelvin day-night temperature difference measured by the phase curve. |
| title | Clouds and Hazes in GJ 1214b's Metal-Rich Atmosphere |
| topic | Earth and Planetary Astrophysics |
| url | https://arxiv.org/abs/2503.22608 |