A temperate super-Jupiter imaged with JWST in the mid-infrared

• 成果类型: Article
• 署名作者: Matthews, E. C.; Carter, A. L.; Pathak, P.; Morley, C. V.; Phillips, M. W.; Krishanth, S.; Feng, F.; Bonse, M. J.; Boogaard, L. A.; Burt, J. A.; Crossfield, I. J. M.; Douglas, E. S.; Henning, Th.; Hom, J.; Ko, C-L; Kasper, M.; Lagrange, A-M; de la Roche, D. Petit Dit; Philipot, F.
• 署名单位: Max Planck Society; Space Telescope Science Institute; Indian Institute of Technology System (IIT System); Indian Institute of Technology (IIT) - Kanpur; University of Texas System; University of Texas Austin; University of Edinburgh; Shanghai Jiao Tong University; Swiss Federal Institutes of Technology Domain; ETH Zurich; Max Planck Society; National Aeronautics & Space Administration (NASA); NASA Jet Propulsion Laboratory (JPL); California Institute of Technology; University of Kansas; European Southern Observatory; Universite PSL; Observatoire de Paris; Universite Paris Cite; Sorbonne Universite; Centre National de la Recherche Scientifique (CNRS); University of Geneva
• 刊物名称: Nature
• ISSN/ISSBN: 0028-5570
• DOI: 10.1038/s41586-024-07837-8
• 发表日期: 2024-09-26
• 页码: 789-+
• 关键词: epsilon; search; disk; companions; spitzer; LIMITS

摘要

Of the approximately 25 directly imaged planets to date, all are younger than 500 Myr, and all but six are younger than 100 Myr (ref. 1). Eps Ind A (HD209100, HIP108870) is a K5V star of roughly solar age (recently derived as 3.7-5.7 Gyr (ref. 2) and 3.5(-1.3)(+0.8) Gyr (ref. 3)). A long-term radial-velocity trend(4,5) and an astrometric acceleration(6,7) led to claims of a giant planet(2,8,9) orbiting the nearby star (3.6384 +/- 0.0013 pc; ref. 10). Here we report JWST coronagraphic images which reveal a giant exoplanet that is consistent with these radial and astrometric measurements but inconsistent with the previously claimed planet properties. The new planet has a temperature of approximately 275 K and is remarkably bright at 10.65 and 15.50 mu m. Non-detections between 3.5 and 5.0 mu m indicate an unknown opacity source in the atmosphere, possibly suggesting a high-metallicity, high carbon-to-oxygen ratio planet. The best-fitting temperature of the planet is consistent with theoretical thermal evolution models, which were previously untested at this temperature range. The data indicate that this is probably the only giant planet in the system, and therefore we refer to it as b, despite it having significantly different orbital properties than the previously claimed planet b.