JWST Coronagraphic Images of 14 Her c: a Cold Giant Planet in a Dynamically Hot, Multi-planet System
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2025
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| author | Gagliuffi, Daniella C. Bardalez Balmer, William O. Pueyo, Laurent Brandt, Timothy D. Giovinazzi, Mark R. Millholland, Sarah Black, Brennen Lu, Tiger Rice, Malena Mang, James Morley, Caroline Lacy, Brianna Girard, Julien Matthews, Elisabeth Carter, Aarynn Bowler, Brendan P. Faherty, Jacqueline K. Fontanive, Clemence Rickman, Emily |
| author_facet | Gagliuffi, Daniella C. Bardalez Balmer, William O. Pueyo, Laurent Brandt, Timothy D. Giovinazzi, Mark R. Millholland, Sarah Black, Brennen Lu, Tiger Rice, Malena Mang, James Morley, Caroline Lacy, Brianna Girard, Julien Matthews, Elisabeth Carter, Aarynn Bowler, Brendan P. Faherty, Jacqueline K. Fontanive, Clemence Rickman, Emily |
| contents | Most observed multi-planet systems are coplanar, in a dynamically "cold" configuration of concentric orbits like our own Solar System. With the James Webb Space Telescope (JWST) we have detected 14 Her c, the first mature and cold exoplanet directly imaged in a dynamically "hot", multi-planet system. With large eccentricities and a nonzero mutual inclination, the present-day architecture of this system points to a turbulent past and ongoing angular momentum exchange between the planetary orbits of 14 Her b and c. The temperature of 14 Her c rivals both the coldest imaged exoplanet and the coldest known brown dwarf. Moreover, its photometry at 4.4 mu is consistent with the presence of carbon disequilibrium chemistry and water ice clouds in its atmosphere. 14 Her c presents a unique laboratory to study giant planet formation, dynamical evolution of multi-planet system architectures, and atmospheric composition and dynamics in extremely cold worlds. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2506_09201 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | JWST Coronagraphic Images of 14 Her c: a Cold Giant Planet in a Dynamically Hot, Multi-planet System Gagliuffi, Daniella C. Bardalez Balmer, William O. Pueyo, Laurent Brandt, Timothy D. Giovinazzi, Mark R. Millholland, Sarah Black, Brennen Lu, Tiger Rice, Malena Mang, James Morley, Caroline Lacy, Brianna Girard, Julien Matthews, Elisabeth Carter, Aarynn Bowler, Brendan P. Faherty, Jacqueline K. Fontanive, Clemence Rickman, Emily Earth and Planetary Astrophysics Solar and Stellar Astrophysics Most observed multi-planet systems are coplanar, in a dynamically "cold" configuration of concentric orbits like our own Solar System. With the James Webb Space Telescope (JWST) we have detected 14 Her c, the first mature and cold exoplanet directly imaged in a dynamically "hot", multi-planet system. With large eccentricities and a nonzero mutual inclination, the present-day architecture of this system points to a turbulent past and ongoing angular momentum exchange between the planetary orbits of 14 Her b and c. The temperature of 14 Her c rivals both the coldest imaged exoplanet and the coldest known brown dwarf. Moreover, its photometry at 4.4 mu is consistent with the presence of carbon disequilibrium chemistry and water ice clouds in its atmosphere. 14 Her c presents a unique laboratory to study giant planet formation, dynamical evolution of multi-planet system architectures, and atmospheric composition and dynamics in extremely cold worlds. |
| title | JWST Coronagraphic Images of 14 Her c: a Cold Giant Planet in a Dynamically Hot, Multi-planet System |
| topic | Earth and Planetary Astrophysics Solar and Stellar Astrophysics |
| url | https://arxiv.org/abs/2506.09201 |