JWST COMPASS: The first near- to mid-infrared transmission spectrum of the hot super-Earth L 168-9 b
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_ | 1866929577273589760 |
|---|---|
| author | Alam, Munazza K. Gao, Peter Redai, Jea Adams Wallack, Nicole L. Wogan, Nicholas F. Aguichine, Artyom Dattilo, Anne Alderson, Lili Batalha, Natasha E. Batalha, Natalie M. Kirk, James López-Morales, Mercedes Meech, Annabella Moran, Sarah E. Teske, Johanna Wakeford, Hannah R. Wolfgang, Angie |
| author_facet | Alam, Munazza K. Gao, Peter Redai, Jea Adams Wallack, Nicole L. Wogan, Nicholas F. Aguichine, Artyom Dattilo, Anne Alderson, Lili Batalha, Natasha E. Batalha, Natalie M. Kirk, James López-Morales, Mercedes Meech, Annabella Moran, Sarah E. Teske, Johanna Wakeford, Hannah R. Wolfgang, Angie |
| contents | We present the first broadband near- to mid-infrared (3-12 microns) transmission spectrum of the highly-irradiated (T_eq = 981 K) M dwarf rocky planet L 168-9 b (TOI-134 b) observed with the NIRSpec and MIRI instruments aboard JWST. We measure the near-infrared transit depths to a combined median precision of 20 ppm across the three visits in 54 spectroscopic channels with uniform widths of 60 pixels (~0.2 microns wide; R~100), and the mid-infrared transit depths to 61 ppm median precision in 48 wavelength bins (~0.15 microns wide; R~50). We compare the transmission spectrum of L 168-9 b to a grid of 1D thermochemical equilibrium forward models, and rule out atmospheric metallicities of less than 100x solar (mean molecular weights <4 g mol$^{-1}$) to 3-sigma confidence assuming high surface pressure (>1 bar), cloudless atmospheres. Based on photoevaporation models for L 168-9 b with initial atmospheric mass fractions ranging from 2-100%, we find that this planet could not have retained a primordial H/He atmosphere beyond the first 200 Myr of its lifetime. Follow-up MIRI eclipse observations at 15 microns could make it possible to confidently identify a CO2-dominated atmosphere on this planet if one exists. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2411_03154 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | JWST COMPASS: The first near- to mid-infrared transmission spectrum of the hot super-Earth L 168-9 b Alam, Munazza K. Gao, Peter Redai, Jea Adams Wallack, Nicole L. Wogan, Nicholas F. Aguichine, Artyom Dattilo, Anne Alderson, Lili Batalha, Natasha E. Batalha, Natalie M. Kirk, James López-Morales, Mercedes Meech, Annabella Moran, Sarah E. Teske, Johanna Wakeford, Hannah R. Wolfgang, Angie Earth and Planetary Astrophysics We present the first broadband near- to mid-infrared (3-12 microns) transmission spectrum of the highly-irradiated (T_eq = 981 K) M dwarf rocky planet L 168-9 b (TOI-134 b) observed with the NIRSpec and MIRI instruments aboard JWST. We measure the near-infrared transit depths to a combined median precision of 20 ppm across the three visits in 54 spectroscopic channels with uniform widths of 60 pixels (~0.2 microns wide; R~100), and the mid-infrared transit depths to 61 ppm median precision in 48 wavelength bins (~0.15 microns wide; R~50). We compare the transmission spectrum of L 168-9 b to a grid of 1D thermochemical equilibrium forward models, and rule out atmospheric metallicities of less than 100x solar (mean molecular weights <4 g mol$^{-1}$) to 3-sigma confidence assuming high surface pressure (>1 bar), cloudless atmospheres. Based on photoevaporation models for L 168-9 b with initial atmospheric mass fractions ranging from 2-100%, we find that this planet could not have retained a primordial H/He atmosphere beyond the first 200 Myr of its lifetime. Follow-up MIRI eclipse observations at 15 microns could make it possible to confidently identify a CO2-dominated atmosphere on this planet if one exists. |
| title | JWST COMPASS: The first near- to mid-infrared transmission spectrum of the hot super-Earth L 168-9 b |
| topic | Earth and Planetary Astrophysics |
| url | https://arxiv.org/abs/2411.03154 |