Astronomy:WASP-50

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Short description: Star in the constellation Eridanus
WASP-50 / Chaophraya
Observation data
Equinox J2000.0]] (ICRS)
Constellation Eridanus
Right ascension  02h 54m 45.1343s[1]
Declination −10° 53′ 53.0260″[1]
Apparent magnitude (V) 11.44
Characteristics
Spectral type G9V
Astrometry
Radial velocity (Rv)25.24 km/s
Proper motion (μ) RA: 3.281 mas/yr
Dec.: 8.963 mas/yr
Parallax (π)5.3816 ± 0.0540[1] mas
Distance606 ± 6 ly
(186 ± 2 pc)
Details[2][3]
Mass0.892+0.08−0.074 M
Radius0.843±0.031 R
Surface gravity (log g)4.5±0.1 cgs
Temperature5400±100 K
Metallicity−0.12±0.08
Rotation16.30 ± 0.50 d
Rotational velocity (v sin i)2.6±0.5 km/s
Age8.57±2.86 Gyr
Other designations
Gaia DR2 5160557726183065984, TYC 5290-462-1, GSC 05290-00462, 2MASS J02544513-1053530[1]
Database references
SIMBADdata

WASP-50 is a G-type main-sequence star about 610 light-years away. The star is older than the Sun and slightly depleted in heavy elements compared to the Sun, and has a close to average starspot activity.[4] Despite its advanced age, the star is rotating rapidly, being spun up by the tides raised by giant planet on close orbit.[3]

The star was named Chaophraya in December 2019 by the Thai amateur astronomers.[5]

Planetary system

In 2011 a transiting hot superjovian planet b (named Maeping in 2019[5]) was detected.[4] It has an equilibrium temperature of 1405±58 K.[2]


The WASP-50 planetary system[2][4][6]
Companion
(in order from star)
Mass Semimajor axis
(AU)
Orbital period
(days)
Eccentricity Inclination Radius
b / Maeping 1.437±0.068 MJ 0.0293±0.0013 1.955100±0.000005 0.01+0.02−0.01 84.88±0.27° 1.138±0.026 RJ

References

  1. 1.0 1.1 1.2 1.3 WASP-50 -- Star
  2. 2.0 2.1 2.2 Chakrabarty, Aritra; Sengupta, Sujan (2019), "Precise Photometric Transit Follow-up Observations of Five Close-in Exoplanets: Update on Their Physical Properties", The Astronomical Journal 158 (1): 39, doi:10.3847/1538-3881/ab24dd, Bibcode2019AJ....158...39C 
  3. 3.0 3.1 Maxted, P. F. L.; Serenelli, A. M.; Southworth, J. (2015), "A comparison of gyrochronological and isochronal age estimates for transiting exoplanet host stars", Astronomy & Astrophysics 577: A90, doi:10.1051/0004-6361/201525774, Bibcode2015A&A...577A..90M 
  4. 4.0 4.1 4.2 Gillon, M.; Doyle, A. P.; Lendl, M.; Maxted, P. F. L.; Triaud, A. H. M. J.; Anderson, D. R.; Barros, S. C. C.; Bento, J. et al. (2011), "WASP-50 b: a hot Jupiter transiting a moderately active solar-type star", Astronomy & Astrophysics 533: A88, doi:10.1051/0004-6361/201117198, Bibcode2011A&A...533A..88G 
  5. 5.0 5.1 "Two celestial objects named Chao Phraya and Maeping". 19 December 2019. https://www.nationthailand.com/edandtech/30379640. 
  6. Tregloan-Reed, Jeremy; Southworth, John (2012), "An extremely high photometric precision in ground-based observations of two transits in the WASP-50 planetary system", Monthly Notices of the Royal Astronomical Society 431: 966–971, doi:10.1093/mnras/stt227 

Coordinates: Sky map 02h 54m 45.1343s, −10° 53′ 53.0260″