WASP-58

WASP-58
Observation data; Epoch J2000 Equinox J2000
Constellation	Lyra
Right ascension	18h 18m 48.25296s
Declination	+45° 10′ 19.2603″
Apparent magnitude (V)	11.66
Characteristics
Evolutionary stage	Main sequence
Spectral type	G2V
Astrometry
Radial velocity (Rv)	−28.42±0.71 km/s
Proper motion (μ)	RA: 32.658 mas/yr ; Dec.: 47.057 mas/yr
Parallax (π)	3.3963±0.0112 mas
Distance	960 ± 3 ly ; (294.4 ± 1.0 pc)
Orbit
Primary	WASP-58A
Companion	WASP-58B
Semi-major axis (a)	1.281±0.002"; (384±64 AU)
Details
WASP-58A
Mass	0.940±0.100 M☉
Radius	1.17±0.13 R☉
Surface gravity (log g)	4.23±0.1 cgs
Temperature	6039±55 K
Metallicity [Fe/H]	-0.09±0.04 dex
Rotation	22.6+11.7; −6.1 d
Rotational velocity (v sin i)	2.8±0.9 km/s
Age	12.80+0.20; −2.10 Gyr
WASP-58B
Temperature	3396±53 K
Other designations
	TOI-1627, TIC 424435940, WASP-58, TYC 3525-76-1, 2MASS J18184825+4510192
Database references
SIMBAD	data
Exoplanet Archive	data

WASP-58 is a binary star system in the constellation Lyra. It comprises a G-type main-sequence star and a red dwarf at a separation of 384 astronomical units. WASP-58 is slightly depleted in heavy elements, having 80% of the solar abundance of iron. The system is much older than the Sun at 12.80^+0.20
_−2.10 billion years. Based on parallax measurements, it lies at a distance of 960 light-years (290 parsecs).

Lithium was detected in the stellar spectrum of WASP-58A, making the star anomalous for its advanced age.^[3]

A multiplicity survey in 2015 detected a red dwarf stellar companion^[9] at a projected separation of 1.281±0.002″ to WASP-58A, and it was confirmed to be gravitationally bound in 2016.^[4]

Planetary system

In 2012 a transiting hot Jupiter planet, WASP-58b, was detected on a tight, circular orbit around the primary star WASP-58A.^[3] The planetary equilibrium temperature is 1270±80 K.^[3]

The WASP-58 planetary system^[5]
Companion (in order from star)	Mass	Semimajor axis (AU)	Orbital period (days)	Eccentricity	Inclination	Radius
b	0.899^+0.074 _−0.072 $M$ _J	0.0562^+0.0019 _−0.0020	5.017180±0.000011	<0.044	87.4±1.5°	1.37±0.2 $R$ _J

References

^ Roman, Nancy G. (1987). "Identification of a constellation from a position". Publications of the Astronomical Society of the Pacific. 99 (617): 695. Bibcode:1987PASP...99..695R. doi:10.1086/132034. Constellation record for this object at VizieR.
^ ^a ^b ^c ^d ^e 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.
^ ^a ^b ^c ^d ^e Hébrard, G.; et al. (2012), "WASP-52b, WASP-58b, WASP-59b, and WASP-60b: Four new transiting close-in giant planets", Astronomy & Astrophysics, 549: A134, arXiv:1211.0810, doi:10.1051/0004-6361/201220363, S2CID 54502046
^ ^a ^b ^c Ngo, Henry; Knutson, Heather A.; Hinkley, Sasha; Bryan, Marta; Crepp, Justin R.; Batygin, Konstantin; Crossfield, Ian; Hansen, Brad; Howard, Andrew W.; Johnson, John A.; Mawet, Dimitri; Morton, Timothy D.; Muirhead, Philip S.; Wang, Ji (2016), "FRIENDS OF HOT JUPITERS. IV. STELLAR COMPANIONS BEYOND 50 au MIGHT FACILITATE GIANT PLANET FORMATION, BUT MOST ARE UNLIKELY TO CAUSE KOZAI–LIDOV MIGRATION", The Astrophysical Journal, 827 (1): 8, arXiv:1606.07102, Bibcode:2016ApJ...827....8N, doi:10.3847/0004-637X/827/1/8, S2CID 41083068
^ ^a ^b Bonomo, A. S.; et al. (2017), "The GAPS Programme with HARPS-N@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, S2CID 118923163
^ ^a ^b Andreasen, D. T.; Sousa, S. G.; Tsantaki, M.; Teixeira, G. D. C.; Mortier, A.; Santos, N. C.; Suárez-Andrés, L.; Delgado-Mena, E.; Ferreira, A. C. S. (2017), "SWEET-Cat update and FASMA", Astronomy & Astrophysics, 600: A69, arXiv:1703.06671, Bibcode:2017A&A...600A..69A, doi:10.1051/0004-6361/201629967, S2CID 119534579
^ Brown, D. J. A. (2014), "Discrepancies between isochrone fitting and gyrochronology for exoplanet host stars?", Monthly Notices of the Royal Astronomical Society, 442 (2): 1844–1862, arXiv:1406.4402, Bibcode:2014MNRAS.442.1844B, doi:10.1093/mnras/stu950
^ "WASP-58". SIMBAD. Centre de données astronomiques de Strasbourg.
^ Wöllert, Maria; Brandner, Wolfgang; Bergfors, Carolina; Henning, Thomas (2015), "A Lucky Imaging search for stellar companions to transiting planet host stars", Astronomy & Astrophysics, 575: A23, arXiv:1507.01938, Bibcode:2015A&A...575A..23W, doi:10.1051/0004-6361/201424091, S2CID 119250579