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5. KELT-9 and its ultra-hot Jupiter: Stellar parameters, composition, and planetary pollution

   https://doi.org/10.1093/mnras/stac3329  

   Kama, Mihkel ; Folsom, Colin P. ; Jermyn, Adam S. ; Teske, Johanna K. ( November 2022 , Monthly Notices of the Royal Astronomical Society)

   KELT-9b is an ultra-hot Jupiter observed to be undergoing extreme mass-loss. Its A0-type host star has a radiative envelope, which makes its surface layers prone to retaining recently accreted material. To search for potential signs of planetary material polluting the stellar surface, we carry out the most comprehensive chemical characterization of KELT-9 to-date. New element detections include Na and Y, which had previously been detected in the ultra-hot Jupiter but not studied in the star; these detections complete the set of ten elements measured in both star and planet. In comparing KELT-9 with similar open cluster stars we find no strong anomalies. This finding is consistent with calculations of photospheric pollution accounting for stellar mixing and using observationally estimated KELT-9b mass-loss rates. We also rule out recent, short-lived intensive mass transfer such as the stellar ingestion of an Earth-mass exomoon.

    

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