KELT-9b

KELT-9b is the hottest gas giant exoplanet known, with a dayside temperature of 4600 K, which makes it hotter than M-type stars, and many K-type stars.[1] It orbits HD 195689 (or KELT-9), an A-type main sequence star about 620 light-years (190 parsecs) from Earth.[1]

The host star has a temperature of 10170 K, which is remarkable, as transiting planets are not usually detected in hot stars; as a reference, only six A-type stars were known to have planets prior to KELT-9b discovery (WASP-33, an A-type star with a temperature of 7430 K being the hottest at the moment of the discovery of KELT-9b), and no B-type stars were known (hotter than A-type stars); KELT-9, classified as B9.5-A0[1] or A1[2], is the first B-type star (or, at least, almost B-type) in which a planet has been discovered.

KELT-9b was detected using the Kilodegree Extremely Little Telescope and the results of its unusual nature were published in 2016.[3][1]

References

  1. 1 2 3 4 Gaudi, B. Scott; et al. (2017). "A giant planet undergoing extreme-ultraviolet irradiation by its hot massive-star host". Nature. doi:10.1038/nature22392.
  2. ↑ Jensen, K. S. (1981). "Spectral Classification in the MK System of 167 Northern HD Stars". Astronomy and Astrophysics Supplement. 45: 455. Bibcode:1981A&AS...45..455J.
  3. ↑ Collins, Karen A.; Stassun, Keivan; Gaudi, B. Scott; Beatty, Thomas G.; Zhou, George; Latham, David W.; Bieryla, Allyson; Eastman, Jason D.; Siverd, Robert; Crepp, Justin R.; Pepper, Joshua (2016). "KELT-9b: A Case Study in Dynamical Planet Ingestion by a Hot Host Star". American Astronomical Society. 47: 204.03. Bibcode:2016DDA....4720403C.


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