Report
JWST COMPASS: The first near- to mid-infrared transmission spectrum of the hot super-Earth L 168-9 b
| العنوان: | JWST COMPASS: The first near- to mid-infrared transmission spectrum of the hot super-Earth L 168-9 b |
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| المؤلفون: | 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 |
| سنة النشر: | 2024 |
| المجموعة: | Astrophysics |
| مصطلحات موضوعية: | Astrophysics - Earth and Planetary Astrophysics |
| الوصف: | 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. Comment: 19 pages, 11 figures, accepted for publication in The Astronomical Journal |
| نوع الوثيقة: | Working Paper |
| URL الوصول: | http://arxiv.org/abs/2411.03154 |
| رقم الانضمام: | edsarx.2411.03154 |
| قاعدة البيانات: | arXiv |
| الوصف غير متاح. |