WASP-20

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WASP-20
Observation data
Epoch J2000        Equinox J2000
Constellation Cetus [1]
Right ascension 00h 20m 38.53504s [2]
Declination −23° 56′ 08.6028″ [2]
Apparent magnitude  (V)10.779 [3]
Characteristics
Spectral type F9V [4]
Astrometry
Radial velocity (Rv)1.26±0.85 [2] km/s
Proper motion (μ)RA: 1.352 mas/yr [2]
Dec.: -14.739 mas/yr [2]
Parallax (π)3.4699±0.7095  mas [2]
Distance approx. 900  ly
(approx. 290  pc)
Details [5]
Mass 1.200±0.041  M☉
Radius 1.392±0.044  R☉
Temperature 5940±100  K
Metallicity [Fe/H]−0.008±0.060  dex
Rotational velocity (v sin i)4.75±0.51 km/s
Age 7.0+2.0
−1.0  Gyr
Other designations
CD−24 102, TOI-194, TIC 211438925, WASP-20, TYC 6413-439-1, GSC 06413-00439, 2MASS J00203853-2356086 [3]
Database references
SIMBAD data

WASP-20, also known as CD-24 102, is a binary star [4] 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. [6]

Contents

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. [7]

Planetary system

WASP-20b is a transiting hot Jupiter discovered in 2014. [7] 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. [5]

The WASP-20 planetary system [5]
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
b0.311+0.019
−0.018  MJ 		0.05999+0.00069
−0.00068		4.8996284(33)<0.03985.56±0.22 ° 1.462±0.059  RJ

See also

References

  1. ↑ "Finding the constellation which contains given sky coordinates". djm.cc. 2 August 2008.
  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. 1 2 "CD-24 102". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 16 April 2024.
  4. 1 2 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. arXiv: 1611.08735 . Bibcode:2016ApJ...833L..19E. doi: 10.3847/2041-8213/833/2/L19 .
  5. 1 2 3 Bonomo, A. S.; Desidera, 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. arXiv: 1704.00373 . Bibcode:2017A&A...602A.107B. doi:10.1051/0004-6361/201629882.
  6. ↑ "WASP-20 | NASA Exoplanet Archive".
  7. 1 2 Anderson, D. R.; Collier Cameron, A.; 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. arXiv: 1402.1482 . Bibcode:2015A&A...575A..61A. doi:10.1051/0004-6361/201423591.
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