Astronomy:WASP-20
WASP-20, also known as CD-24 102, is a binary star[1] system in the equatorial constellation Cetus, located at a distance of about 940 light-years (290 parsecs) from the Sun. The primary star is an F-type main sequence star and hosts one confirmed exoplanet, WASP-20b.[2]
Stellar properties
WASP-20 is a star of spectral type F9, aged 7+2
−1 billion years. Its mass is 1.200 ± 0.041 solar masses for a radius of 1.392 ± 0.044 solar radii, or a density of 0.630 ± 0.046 grams per cubic centimeter.[3]
Planetary system
WASP-20b is a transiting hot Jupiter discovered in 2014.[3] WASP-20b orbits WASP-20 in less than five Earth days very close to its star (0.06 AU) in a circular (near-zero eccentricity) orbit. The orbit is inclined by 85.56 ± 0.22° relative to the plane of the sky and is thus edge-on, as necessary for a transit to be observed.[4]
| Companion (in order from star) |
Mass | Semimajor axis (AU) |
Orbital period (days) |
Eccentricity | Inclination | Radius |
|---|---|---|---|---|---|---|
| b | 0.311+0.019 −0.018 MJ |
0.05999+0.00069 −0.00068 |
4.8996284(33) | <0.039 | 85.56±0.22° | 1.462±0.059 RJ |
See also
References
- ↑ Evans, Daniel F.; Southworth, John; Smalley, Barry (December 2016). "WASP-20 Is a Close Visual Binary with a Transiting Hot Jupiter". The Astrophysical Journal Letters 833 (2): L19. doi:10.3847/2041-8213/833/2/L19. Bibcode: 2016ApJ...833L..19E.
- ↑ "WASP-20 | NASA Exoplanet Archive". https://exoplanetarchive.ipac.caltech.edu/overview/wasp%2020%20b#overview.
- ↑ 3.0 3.1 Anderson, D. R. et al. (March 2015). "WASP-20b and WASP-28b: a hot Saturn and a hot Jupiter in near-aligned orbits around solar-type stars". Astronomy & Astrophysics 575: A61. doi:10.1051/0004-6361/201423591. Bibcode: 2015A&A...575A..61A.
- ↑ 4.0 4.1 Bonomo, A. S. et al. (June 2017). "The GAPS Programme with HARPS-N at TNG. XIV. Investigating giant planet migration history via improved eccentricity and mass determination for 231 transiting planets". Astronomy & Astrophysics 602: A107. doi:10.1051/0004-6361/201629882. Bibcode: 2017A&A...602A.107B.
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