Observation of undepleted phosphine in the atmosphere of a low-temperature brown dwarf
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arXiv
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| Autores principales: | , , , , , , , , , , , , , , , , , , |
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| Formato: | Preprint |
| Publicado: |
2025
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| _version_ | 1866908577110687744 |
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| author | Burgasser, Adam J. Gonzales, Eileen C. Beiler, Samuel A. Visscher, Channon Burningham, Ben Mace, Gregory N. Faherty, Jacqueline K. Zhang, Zenghua Sousa-Silva, Clara Lodieu, Nicolas Metchev, Stanimir A. Meisner, Aaron Cushing, Michael Schneider, Adam C. Suarez, Genaro Hsu, Chih-Chun Gerasimov, Roman Aganze, Christian Theissen, Christopher A. |
| author_facet | Burgasser, Adam J. Gonzales, Eileen C. Beiler, Samuel A. Visscher, Channon Burningham, Ben Mace, Gregory N. Faherty, Jacqueline K. Zhang, Zenghua Sousa-Silva, Clara Lodieu, Nicolas Metchev, Stanimir A. Meisner, Aaron Cushing, Michael Schneider, Adam C. Suarez, Genaro Hsu, Chih-Chun Gerasimov, Roman Aganze, Christian Theissen, Christopher A. |
| contents | The atmospheres of low-temperature brown dwarfs and gas giant planets are expected to contain the phosphine molecule, PH$_3$ However, previous observations have shown much lower abundances of this molecule than predicted by atmospheric chemistry models. We report JWST spectroscopic observations of phosphine in the atmosphere of the brown dwarf Wolf 1130C. Multiple absorption lines due to phosphine are detected around 4.3 $μ$m, from which we calculate a phosphine abundance of 0.100$\pm$0.009 parts per million. This abundance is consistent with disequilibrium atmospheric chemistry models that reproduce the phosphine abundances in Jupiter and Saturn, and is much higher than abundances previously reported for other brown dwarfs or exoplanets. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2510_03916 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Observation of undepleted phosphine in the atmosphere of a low-temperature brown dwarf Burgasser, Adam J. Gonzales, Eileen C. Beiler, Samuel A. Visscher, Channon Burningham, Ben Mace, Gregory N. Faherty, Jacqueline K. Zhang, Zenghua Sousa-Silva, Clara Lodieu, Nicolas Metchev, Stanimir A. Meisner, Aaron Cushing, Michael Schneider, Adam C. Suarez, Genaro Hsu, Chih-Chun Gerasimov, Roman Aganze, Christian Theissen, Christopher A. Solar and Stellar Astrophysics Earth and Planetary Astrophysics The atmospheres of low-temperature brown dwarfs and gas giant planets are expected to contain the phosphine molecule, PH$_3$ However, previous observations have shown much lower abundances of this molecule than predicted by atmospheric chemistry models. We report JWST spectroscopic observations of phosphine in the atmosphere of the brown dwarf Wolf 1130C. Multiple absorption lines due to phosphine are detected around 4.3 $μ$m, from which we calculate a phosphine abundance of 0.100$\pm$0.009 parts per million. This abundance is consistent with disequilibrium atmospheric chemistry models that reproduce the phosphine abundances in Jupiter and Saturn, and is much higher than abundances previously reported for other brown dwarfs or exoplanets. |
| title | Observation of undepleted phosphine in the atmosphere of a low-temperature brown dwarf |
| topic | Solar and Stellar Astrophysics Earth and Planetary Astrophysics |
| url | https://arxiv.org/abs/2510.03916 |