WASP-57

WASP-57 is a single G-type main-sequence star about 1310 light-years away. WASP-57 is depleted in heavy elements, having 55% of the solar abundance of iron.[3] WASP-57 is much younger than the Sun at 0.957±0.518 billion years.[5]

WASP-57
Observation data
Epoch J2000      Equinox J2000
Constellation Libra
Right ascension 14h 55m 16.8229s[1]
Declination −02° 03′ 27.5991″[1]
Apparent magnitude (V) 13.04
Characteristics
Evolutionary stage Main sequence
Spectral type G6[2]
Astrometry
Radial velocity (Rv)-23.290[1] km/s
Proper motion (μ) RA: -27.064[1] mas/yr
Dec.: -4.687[1] mas/yr
Parallax (π)2.4826 ± 0.0359 mas[1]
Distance1,310 ± 20 ly
(403 ± 6 pc)
Details[3]
Mass0.886±0.061 M☉
Radius0.927±0.031 R☉
Surface gravity (log g)4.452±0.024[4] cgs
Temperature5600±100 K
Metallicity [Fe/H]-0.25±0.1 dex
Rotation12.7±4.5[5]
Rotational velocity (v sin i)3.7±1.3 km/s
Age0.957±0.518[5] Gyr
Other designations
Gaia DR2 6340377202215639936, GSC 04991-00565, 2MASS J14551682-0203275[2]
Database references
SIMBADdata

A multiplicity survey in 2015 did not detect any stellar companions to WASP-57.[6]

Planetary system

In 2012 a transiting hot Jupiter planet b was detected on a tight, circular orbit around WASP-57.[7]

Planetary equilibrium temperature is 1338±29 K.[4]

The WASP-57 planetary system[3]
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
b 0.643+0.056
−0.054 MJ		 0.03772+0.00083
−0.00089		 2.83891856±0.00000081 <0.059 86.05±0.20° 1.050±0.052 RJ

References
  1. Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  2. "WASP-57". SIMBAD. Centre de données astronomiques de Strasbourg.
  3. Bonomo, A. S.; et al. (2017), "The GAPS Programme with HARPS-N at TNG", Astronomy & Astrophysics, 602: A107, arXiv:1704.00373, Bibcode:2017A&A...602A.107B, doi:10.1051/0004-6361/201629882, S2CID 118923163
  4. Southworth, John; et al. (2015), "Larger and faster: Revised properties and a shorter orbital period for the WASP-57 planetary system from a pro-am collaboration", Monthly Notices of the Royal Astronomical Society, 454 (3): 3094–3107, arXiv:1509.05609, doi:10.1093/mnras/stv2183
  5. Gallet, F.; Gallet (2020), "TATOO: Tidal-chronology standalone tool to estimate the age of massive close-in planetary systems", Astronomy & Astrophysics, 641: A38, arXiv:2006.07880, Bibcode:2020A&A...641A..38G, doi:10.1051/0004-6361/202038058, S2CID 219687851
  6. Wöllert, Maria; Brandner, Wolfgang (2015), "A Lucky Imaging search for stellar sources near 74 transit hosts", Astronomy & Astrophysics, 579: A129, arXiv:1506.05456, Bibcode:2015A&A...579A.129W, doi:10.1051/0004-6361/201526525, S2CID 118903879
  7. Faedi, F.; et al. (2012), "WASP-54b, WASP-56b, and WASP-57b: Three new sub-Jupiter mass planets from SuperWASP", Astronomy & Astrophysics, 551: A73, arXiv:1210.2329, Bibcode:2013A&A...551A..73F, doi:10.1051/0004-6361/201220520, S2CID 14346225


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