Kappa Andromedae b

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Brown dwarf
Kappa Andromedae b
Artist's impression of Kappa Andromedae b
Artist's impression of Kappa Andromedae b
Observation
dates equinox :  J2000.0 , epoch : J2000.0
Constellation Andromeda
Right ascension 23 h 40 m 24.5 s
declination + 44 ° 20 ′ 0.2 ″
Typing
Spectral class L1 ± 1
Physical Properties
Dimensions 50+16
−13 M ♃
Effective temperature 2040 ± 60 K
Age (220 ± 100) * 10 ^ 6 a

Kappa Andromedae b is a brown dwarf around the subgiant Kappa Andromedae , which was initially thought to be a Super-Jupiter . Kappa Andromedae has a very weak reddish glow. In addition, it gradually cools down. The brown dwarf orbits Kappa Andromedae at a distance of about 55 AU, which in our solar system would correspond to an orbit beyond Neptune and Pluto .

discovery

Kappa Andromedae b was photographed directly by the Subaru telescope . At first, Kappa Andromedae b was thought to be a gas giant with Jupiter's masses of 12.8; by reassessing the age of the star, the mass was corrected up to 37 to 66 Jupiter's masses. This means that Kappa Andromedae b is no longer a planet, but a brown dwarf.

Individual evidence

  1. ^ J. Carson, C. Thalmann, M. Janson, T. Kozakis, M. Bonnefoy: DIRECT IMAGING DISCOVERY OF A “SUPER-JUPITER” AROUND THE LATE B-TYPE STAR κ And . In: The Astrophysical Journal . tape 763 , no. 2 , January 16, 2013, ISSN  2041-8205 , p. L32 , doi : 10.1088 / 2041-8205 / 763/2 / L32 ( iop.org [accessed April 16, 2020]).
  2. ↑ Sasha Hinkley, Laurent Pueyo, Jacqueline K. Faherty, Ben R. Oppenheimer, Eric E. Mamajek: THE κ ANDROMEDAE SYSTEM: NEW CONSTRAINTS ON THE COMPANION MASS, SYSTEM AGE, AND FURTHER MULTIPLICITY . In: The Astrophysical Journal . tape 779 , no. 2 , December 3, 2013, ISSN  0004-637X , p. 153 , doi : 10.1088 / 0004-637X / 779/2/153 ( iop.org [accessed April 16, 2020]).