KELT-20

Last updated
KELT-20
Observation data
Epoch J2000.0        Equinox J2000.0
Constellation Cygnus [1]
Right ascension 19h 38m 38.735s [2]
Declination +31° 31′ 09.22″ [2]
Apparent magnitude  (V)7.58 [3]
Characteristics
Evolutionary stage main sequence [2]
Spectral type A2V [4]
Variable type planetary transit
Astrometry
Proper motion (μ)RA: 3.096±0.068 mas/yr [2]
Dec.: −6.157±0.075 mas/yr [2]
Parallax (π)7.3015±0.0433  mas [2]
Distance 447 ± 3  ly
(137.0 ± 0.8  pc)
Absolute magnitude  (MV)+2.30 [1]
Details
Mass 2.3 [5]   M☉
Radius 1.6 [5]   R☉
Luminosity 15.7 [5]   L☉
Surface gravity (log g)4.38 [5]   cgs
Temperature 9,032 [5]   K
Metallicity [Fe/H]−0.02±0.07 [6]   dex
Age 200 [6]   Myr
Other designations
HD 185603, HIP 96618, MASCARA-2, KELT-20
Database references
SIMBAD data

KELT-20, also known as MASCARA-2, is an A2 main sequence star in the constellation of Cygnus, about 447 light years away.

Contents

Nomenclature

KELT-20 is the star's KELT designation. It is also designated as MASCARA-2 meaning that it is the second star observed by the MASCARA exoplanet search program. Its Henry Draper Catalogue designation is HD 185603, and its Hipparcos designation is HIP 96618.

Planetary system

In 2017, the discovery of the planet KELT-20b was announced. [7] [8] [9]

The KELT-20 planetary system
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
b 3.382  MJ 0.053.6127647—86.12° 1.741  RJ

References

  1. 1 2 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters . 38 (5): 331. arXiv: 1108.4971 . Bibcode:2012AstL...38..331A. doi:10.1134/S1063773712050015. XHIP record for this object at VizieR.
  2. 1 2 3 4 5 6 Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv: 2208.00211 . Bibcode:2023A&A...674A...1G. doi: 10.1051/0004-6361/202243940 . S2CID   244398875. Gaia DR3 record for this source at VizieR.
  3. ↑ Høg, E.; Fabricius, C.; Makarov, V. V.; Urban, S.; Corbin, T.; Wycoff, G.; Bastian, U.; Schwekendiek, P.; Wicenec, A. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27. Bibcode:2000A&A...355L..27H. doi:10.1888/0333750888/2862. ISBN   978-0333750889.
  4. ↑ Lund, Michael B.; et al. (2017). "KELT-20b: A Giant Planet with a Period of P ∼ 3.5 days Transiting the V ∼ 7.6 Early a Star HD 185603". The Astronomical Journal. 154 (5): 194. arXiv: 1707.01518 . Bibcode:2017AJ....154..194L. doi: 10.3847/1538-3881/aa8f95 .
  5. 1 2 3 4 5 Stassun, Keivan G.; et al. (9 September 2019). "The Revised TESS Input Catalog and Candidate Target List". The Astronomical Journal. 158 (4): 138. arXiv: 1905.10694 . Bibcode:2019AJ....158..138S. doi: 10.3847/1538-3881/ab3467 . eISSN   1538-3881.
  6. 1 2 Talens, G. J. J.; Justesen, A. B.; Albrecht, S.; McCormac, J.; Van Eylen, V.; Otten, G. P. P. L.; Murgas, F.; Palle, E.; Pollacco, D.; Stuik, R.; Spronck, J. F. P.; Lesage, A. -L.; Grundahl, F.; Fredslund Andersen, M.; Antoci, V.; Snellen, I. A. G. (2018). "MASCARA-2 b. A hot Jupiter transiting the mV = 7.6 A-star HD 185603". Astronomy and Astrophysics. 612. arXiv: 1707.01500 . Bibcode:2018A&A...612A..57T. doi:10.1051/0004-6361/201731512. S2CID   119422884.
  7. ↑ 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, S2CID   246210387
  8. ↑ 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
  9. ↑ 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


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