A Precise Metallicity and Carbon-to-Oxygen Ratio for a Warm Giant Exoplanet from its Panchromatic JWST Emission Spectrum
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2025
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| author | Wiser, Lindsey S. Bell, Taylor J. Line, Michael R. Schlawin, Everett Beatty, Thomas G. Welbanks, Luis Greene, Thomas P. Parmentier, Vivien Murphy, Matthew M. Fortney, Jonathan J. Arnold, Kenny Mehta, Nishil Ohno, Kazumasa Mukherjee, Sagnick |
| author_facet | Wiser, Lindsey S. Bell, Taylor J. Line, Michael R. Schlawin, Everett Beatty, Thomas G. Welbanks, Luis Greene, Thomas P. Parmentier, Vivien Murphy, Matthew M. Fortney, Jonathan J. Arnold, Kenny Mehta, Nishil Ohno, Kazumasa Mukherjee, Sagnick |
| contents | WASP-80 b, a warm sub-Jovian (equilibrium temperature ~820 K, 0.5 Jupiter masses), presents an opportunity to characterize a rare gas giant exoplanet around a low-mass star. In addition, its moderate temperature enables its atmosphere to host a range of carbon and oxygen species (H$_2$O, CH$_4$, CO, CO$_2$, NH$_3$). In this paper, we present a panchromatic emission spectrum of WASP-80 b, the first gas giant around a late K/early M-dwarf star and the coolest planet for which the James Webb Space Telescope has obtained a complete emission spectrum spanning 2.4-12 $μ$m, including NIRCam F322W2 (2.4-4 $μ$m) and F444W (4-5 $μ$m), and MIRI LRS (5-12 $μ$m). We report confident detections of H$_2$O, CH$_4$, CO, and CO$_2$, and a tentative detection of NH$_3$. We estimate WASP-80 b's atmospheric metallicity and carbon-to-oxygen ratio and compare them with estimates for other gas giants. Despite the relative rarity of giant planets around low-mass stars, we find that WASP-80 b's composition is consistent with other hot gas giants, suggesting that the formation pathway of WASP-80 b may not be dissimilar from hot gas giants around higher-mass stars. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2506_01800 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | A Precise Metallicity and Carbon-to-Oxygen Ratio for a Warm Giant Exoplanet from its Panchromatic JWST Emission Spectrum Wiser, Lindsey S. Bell, Taylor J. Line, Michael R. Schlawin, Everett Beatty, Thomas G. Welbanks, Luis Greene, Thomas P. Parmentier, Vivien Murphy, Matthew M. Fortney, Jonathan J. Arnold, Kenny Mehta, Nishil Ohno, Kazumasa Mukherjee, Sagnick Earth and Planetary Astrophysics WASP-80 b, a warm sub-Jovian (equilibrium temperature ~820 K, 0.5 Jupiter masses), presents an opportunity to characterize a rare gas giant exoplanet around a low-mass star. In addition, its moderate temperature enables its atmosphere to host a range of carbon and oxygen species (H$_2$O, CH$_4$, CO, CO$_2$, NH$_3$). In this paper, we present a panchromatic emission spectrum of WASP-80 b, the first gas giant around a late K/early M-dwarf star and the coolest planet for which the James Webb Space Telescope has obtained a complete emission spectrum spanning 2.4-12 $μ$m, including NIRCam F322W2 (2.4-4 $μ$m) and F444W (4-5 $μ$m), and MIRI LRS (5-12 $μ$m). We report confident detections of H$_2$O, CH$_4$, CO, and CO$_2$, and a tentative detection of NH$_3$. We estimate WASP-80 b's atmospheric metallicity and carbon-to-oxygen ratio and compare them with estimates for other gas giants. Despite the relative rarity of giant planets around low-mass stars, we find that WASP-80 b's composition is consistent with other hot gas giants, suggesting that the formation pathway of WASP-80 b may not be dissimilar from hot gas giants around higher-mass stars. |
| title | A Precise Metallicity and Carbon-to-Oxygen Ratio for a Warm Giant Exoplanet from its Panchromatic JWST Emission Spectrum |
| topic | Earth and Planetary Astrophysics |
| url | https://arxiv.org/abs/2506.01800 |