A carbon-rich atmosphere on a windy pulsar planet
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arXiv
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| Autori principali: | , , , , , , , , , , , , , , , , , , , |
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| Natura: | Preprint |
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2025
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| author | Zhang, Michael Beleznay, Maya Brandt, Timothy D. Romani, Roger W. Gao, Peter Beltz, Hayley Bailes, Matthew Nixon, Matthew C. Bean, Jacob L. Komacek, Thaddeus D. Coy, Brandon P. Fu, Guangwei Luque, Rafael Reardon, Daniel J. Carli, Emma Shannon, Ryan M. Fortney, Jonathan J. Piette, Anjali A. A. Miller, M. Coleman Desert, Jean-Michel |
| author_facet | Zhang, Michael Beleznay, Maya Brandt, Timothy D. Romani, Roger W. Gao, Peter Beltz, Hayley Bailes, Matthew Nixon, Matthew C. Bean, Jacob L. Komacek, Thaddeus D. Coy, Brandon P. Fu, Guangwei Luque, Rafael Reardon, Daniel J. Carli, Emma Shannon, Ryan M. Fortney, Jonathan J. Piette, Anjali A. A. Miller, M. Coleman Desert, Jean-Michel |
| contents | A handful of enigmatic Jupiter-mass objects have been discovered orbiting pulsars. One such object, PSR\,J2322-2650b, uniquely resembles a hot Jupiter exoplanet due to its minimum density of 1.8 g/cm^3 and its ~1900 K equilibrium temperature. We use JWST to observe PSR J2322-2650b's emission spectrum across an entire orbit. In stark contrast to every known exoplanet orbiting a main-sequence star, we find an atmosphere rich in molecular carbon (C3, C2) with strong westward winds. Our observations open up new exoplanetary chemical (ultra-high C/O and C/N ratios of >100 and >10,000, respectively) and dynamical regimes (ultra-fast rotation with external irradiation) to observational study. The extreme carbon enrichment poses a severe challenge to the current understanding of ``black widow'' companions, which were expected to consist of a wider range of elements due to their origins as stripped stellar cores. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2509_04558 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | A carbon-rich atmosphere on a windy pulsar planet Zhang, Michael Beleznay, Maya Brandt, Timothy D. Romani, Roger W. Gao, Peter Beltz, Hayley Bailes, Matthew Nixon, Matthew C. Bean, Jacob L. Komacek, Thaddeus D. Coy, Brandon P. Fu, Guangwei Luque, Rafael Reardon, Daniel J. Carli, Emma Shannon, Ryan M. Fortney, Jonathan J. Piette, Anjali A. A. Miller, M. Coleman Desert, Jean-Michel Earth and Planetary Astrophysics High Energy Astrophysical Phenomena Solar and Stellar Astrophysics A handful of enigmatic Jupiter-mass objects have been discovered orbiting pulsars. One such object, PSR\,J2322-2650b, uniquely resembles a hot Jupiter exoplanet due to its minimum density of 1.8 g/cm^3 and its ~1900 K equilibrium temperature. We use JWST to observe PSR J2322-2650b's emission spectrum across an entire orbit. In stark contrast to every known exoplanet orbiting a main-sequence star, we find an atmosphere rich in molecular carbon (C3, C2) with strong westward winds. Our observations open up new exoplanetary chemical (ultra-high C/O and C/N ratios of >100 and >10,000, respectively) and dynamical regimes (ultra-fast rotation with external irradiation) to observational study. The extreme carbon enrichment poses a severe challenge to the current understanding of ``black widow'' companions, which were expected to consist of a wider range of elements due to their origins as stripped stellar cores. |
| title | A carbon-rich atmosphere on a windy pulsar planet |
| topic | Earth and Planetary Astrophysics High Energy Astrophysical Phenomena Solar and Stellar Astrophysics |
| url | https://arxiv.org/abs/2509.04558 |