KELT-20b, also known as MASCARA-2b, was an exoplanet announced in 2017. It is an
Ultra-hot Jupiter orbiting an
A-type star. The
carbon monoxide, steam[1][2] and neutral iron[3] detection in the atmosphere of KELT-20b was announced in 2022.
The host star is an
A-type main-sequence star in the constellation of
Cygnus having 2.282 solar masses, 1.617 solar radius and an apparent magnitude of 7.58.
^Fu, Guangwei; Sing, David K.; Lothringer, Joshua D.; Deming, Drake; Ih, Jegug; Kempton, Eliza M. -R.; Malik, Matej; Komacek, Thaddeus D.; Mansfield, Megan; Bean, Jacob L. (2022), "Strong H2O and CO Emission Features in the Spectrum of KELT-20b Driven by Stellar UV Irradiation", The Astrophysical Journal Letters, 925 (1): L3,
arXiv:2201.02261,
Bibcode:
2022ApJ...925L...3F,
doi:10.3847/2041-8213/ac4968
^Kasper, David; Bean, Jacob L.; Line, Michael R.; Seifahrt, Andreas; Brady, Madison T.; Lothringer, Joshua; Pino, Lorenzo; Fu, Guangwei; Pelletier, Stefan; Stürmer, Julian; Benneke, Björn; Brogi, Matteo; Désert, Jean-Michel (2023), "Unifying High- and Low-resolution Observations to Constrain the Dayside Atmosphere of KELT-20b/MASCARA-2b", The Astronomical Journal, 165 (1): 7,
arXiv:2208.04759,
Bibcode:
2023AJ....165....7K,
doi:10.3847/1538-3881/ac9f40
^Yan, F.; Reiners, A.; Pallé, E.; Shulyak, D.; Stangret, M.; Molaverdikhani, K.; Nortmann, L.; Mollière, P.; Henning, Th.; Casasayas-Barris, N.; Cont, D.; Chen, G.; Czesla, S.; Sánchez-López, A.; López-Puertas, M.; Ribas, I.; Quirrenbach, A.; Caballero, J. A.; Amado, P. J.; Galadí-Enríquez, D.; Khalafinejad, S.; Lara, L. M.; Montes, D.; Morello, G.; Nagel, E.; Sedaghati, E.; Zapatero Osorio, M. R.; Zechmeister, M. (2022), "Detection of iron emission lines and a temperature inversion on the dayside of the ultra-hot Jupiter KELT-20b", Astronomy & Astrophysics, 659: A7,
arXiv:2201.08759,
Bibcode:
2022A&A...659A...7Y,
doi:
10.1051/0004-6361/202142395,
S2CID246210387