JWST Thermal Emission of the Terrestrial Exoplanet GJ 1132b
Fuente:
arXiv
Saved in:
| Main Authors: | , , , , , , , , , , , |
|---|---|
| Format: | Preprint |
| Published: |
2024
|
| Subjects: | |
| Online Access: | |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1866910610922405888 |
|---|---|
| author | Xue, Qiao Bean, Jacob L. Zhang, Michael Mahajan, Alexandra S. Ih, Jegug Eastman, Jason D. Lunine, Jonathan I. Mansfield, Megan Weiner Coy, Brandon P. Kempton, Eliza M. -R. Koll, Daniel D. Kite, Edwin S. |
| author_facet | Xue, Qiao Bean, Jacob L. Zhang, Michael Mahajan, Alexandra S. Ih, Jegug Eastman, Jason D. Lunine, Jonathan I. Mansfield, Megan Weiner Coy, Brandon P. Kempton, Eliza M. -R. Koll, Daniel D. Kite, Edwin S. |
| contents | We present thermal emission measurements of GJ 1132b spanning 5--12 um obtained with the Mid-Infrared Instrument Low-Resolution Spectrometer (MIRI/LRS) on the James Webb Space Telescope (JWST). GJ 1132b is an M-dwarf rocky planet with Teq=584 K and an orbital period of 1.6 days. We measure a white-light secondary eclipse depth of 140+/-17 ppm, which corresponds to a dayside brightness temperature of Tp,dayside= 709+/-31 K using improved star and planet parameters. This measured temperature is only 1 sigma below the maximum possible dayside temperature of a bare rock (i.e., assuming a zero albedo planet with no heat redistribution, Tmax = 746+14/-11 K). The emission spectrum is consistent with a featureless blackbody, which agrees with a wide range of possible surface compositions. By comparing forward models to the dayside emission spectrum, we rule out Earth-thickness (P ~ 1 bar) atmospheres with at least 1% H2O, atmospheres of any modeled thickness (10^-4 -- 10^2 bar) that contain at least 1% CO2, and thick, Venus-like atmospheres (P>~100 bar) with at least 1 ppm CO2 or H2O. We therefore conclude that GJ 1132b likely does not have a significant atmosphere. This finding supports the concept of a universal 'Cosmic Shoreline' given the high level of bolometric and XUV irradiation received by the planet. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2408_13340 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | JWST Thermal Emission of the Terrestrial Exoplanet GJ 1132b Xue, Qiao Bean, Jacob L. Zhang, Michael Mahajan, Alexandra S. Ih, Jegug Eastman, Jason D. Lunine, Jonathan I. Mansfield, Megan Weiner Coy, Brandon P. Kempton, Eliza M. -R. Koll, Daniel D. Kite, Edwin S. Earth and Planetary Astrophysics We present thermal emission measurements of GJ 1132b spanning 5--12 um obtained with the Mid-Infrared Instrument Low-Resolution Spectrometer (MIRI/LRS) on the James Webb Space Telescope (JWST). GJ 1132b is an M-dwarf rocky planet with Teq=584 K and an orbital period of 1.6 days. We measure a white-light secondary eclipse depth of 140+/-17 ppm, which corresponds to a dayside brightness temperature of Tp,dayside= 709+/-31 K using improved star and planet parameters. This measured temperature is only 1 sigma below the maximum possible dayside temperature of a bare rock (i.e., assuming a zero albedo planet with no heat redistribution, Tmax = 746+14/-11 K). The emission spectrum is consistent with a featureless blackbody, which agrees with a wide range of possible surface compositions. By comparing forward models to the dayside emission spectrum, we rule out Earth-thickness (P ~ 1 bar) atmospheres with at least 1% H2O, atmospheres of any modeled thickness (10^-4 -- 10^2 bar) that contain at least 1% CO2, and thick, Venus-like atmospheres (P>~100 bar) with at least 1 ppm CO2 or H2O. We therefore conclude that GJ 1132b likely does not have a significant atmosphere. This finding supports the concept of a universal 'Cosmic Shoreline' given the high level of bolometric and XUV irradiation received by the planet. |
| title | JWST Thermal Emission of the Terrestrial Exoplanet GJ 1132b |
| topic | Earth and Planetary Astrophysics |
| url | https://arxiv.org/abs/2408.13340 |