Kama, Mihkel;
Folsom, Colin P;
Jermyn, Adam S;
Teske, Johanna K;
(2023)
KELT-9 and its ultra-hot Jupiter: Stellar parameters, composition, and planetary pollution.
Monthly Notices of the Royal Astronomical Society
, 518
(2)
pp. 3116-3122.
10.1093/mnras/stac3329.
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Abstract
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.
| Type: | Article |
|---|---|
| Title: | KELT-9 and its ultra-hot Jupiter: Stellar parameters, composition, and planetary pollution |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1093/mnras/stac3329 |
| Publisher version: | https://doi.org/10.1093/mnras/stac3329 |
| Language: | English |
| Additional information: | This version is the author accepted manuscript. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | planet–star interactions, stars: abundances, stars: early-type |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy |
| URI: | https://discovery-pp.ucl.ac.uk/id/eprint/10161389 |
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