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Direct imaging discovery of a Jovian exoplanet within a triple-star system

Abstract : Direct imaging allows for the detection and characterization of exoplanets via their thermal emission. We report the discovery via imaging of a young Jovian planet in a triple-star system and characterize its atmospheric properties through near-infrared spectroscopy. The semimajor axis of the planet is closer relative to that of its hierarchical triple-star system than for any known exoplanet within a stellar binary or triple, making HD 131399 dynamically unlike any other known system. The location of HD 131399Ab on a wide orbit in a triple system demonstrates that massive planets may be found on long and possibly unstable orbits in multistar systems. HD 131399Ab is one of the lowest mass (4 ± 1 Jupiter masses) and coldest (850 ± 50 kelvin) exoplanets to have been directly imaged.
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Submitted on : Thursday, June 9, 2022 - 10:47:48 AM
Last modification on : Saturday, June 25, 2022 - 3:06:19 AM

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Kevin Wagner, Dániel Apai, Markus Kasper, Kaitlin Kratter, Melissa Mcclure, et al.. Direct imaging discovery of a Jovian exoplanet within a triple-star system. Science, 2016, 353, pp.673-678. ⟨10.1126/science.aaf9671⟩. ⟨insu-03691526⟩

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