WASP-58

WASP-58
Observation data; Epoch J2000 Equinox J2000
Constellation	Lyra
Right ascension	18h 18m 48.2531s
Declination	45° 10′ 19.2592″
Apparent magnitude (V)	11.66
Characteristics
Evolutionary stage	Main sequence
Spectral type	G2V
Astrometry
Radial velocity (Rv)	-28.708 km/s
Proper motion (μ)	RA: 32.579 mas/yr ; Dec.: 47.140 mas/yr
Parallax (π)	3.4147 ± 0.0214 mas
Distance	955 ± 6 ly ; (293 ± 2 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
	Gaia DR2 2115245554756763392, TYC 3525-76-1, 2MASS J18184825+4510192
Database references
SIMBAD	data

WASP-58 is a binary star system comprising a G-type main-sequence star and a red dwarf about 955 light-years away. WASP-58 is slightly depleted in heavy elements, having 80% of the solar abundance of iron.^[5] WASP-58 is much older than the Sun at 12.80^+0.20
_−2.10 billion years.^[4]

Lithium was detected in the stellar spectrum of WASP-58A, making the star anomalous for its advanced age.^[2]

A multiplicity survey in 2015 did detect a red dwarf stellar companion^[8] at a projected separation of 1.281±0.002″ to WASP-58A, and it was confirmed to be gravitationally bound in 2016.^[3]

Planetary system[]

In 2012 a transiting hot Jupiter planet b was detected on a tight, circular orbit around the primary star WASP-58A.^[2]

Planetary equilibrium temperature is 1270±80 K.^[2]

The WASP-58 planetary system^[4]
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[]

^ ^a ^b ^c ^d ^e ^f 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.
^ ^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 ^c Bonomo, A. S.; et al. (2017), "The GAPS Programme with HARPS-N at TNG", Astronomy & Astrophysics, 602: A107, arXiv:1704.00373, doi:10.1051/0004-6361/201629882, S2CID 118923163
^ ^a ^b ^c 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, 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, 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

Coordinates: 23^h 18^m 29.5475^s, +24° 53′ 21.4364″

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[dr2-1] ^ ^a ^b ^c ^d ^e ^f 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.

[Hebrard2012-2] 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

[Ngo2016-3] 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

[Bonomo2017-4] Bonomo, A. S.; et al. (2017), "The GAPS Programme with HARPS-N at TNG", Astronomy & Astrophysics, 602: A107, arXiv:1704.00373, doi:10.1051/0004-6361/201629882, S2CID 118923163

[Andreasen2017-5] 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, doi:10.1051/0004-6361/201629967, S2CID 119534579

[6] 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, doi:10.1093/mnras/stu950

[simbad-7] "WASP-58". SIMBAD. Centre de données astronomiques de Strasbourg.

[8] 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

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Observation data Epoch J2000 Equinox J2000
Constellation	Lyra
Right ascension	18^h 18^m 48.2531^s^[1]
Declination	45° 10′ 19.2592″^[1]
Apparent magnitude (V)	11.66^[2]
Characteristics
Evolutionary stage	Main sequence
Spectral type	G2V^[2]
Astrometry

Radial velocity (R_v)	-28.708^[1] km/s
Proper motion (μ)	RA: 32.579^[1] mas/yr Dec.: 47.140^[1] mas/yr
Parallax (π)	3.4147 ± 0.0214^[1] mas
Distance	955 ± 6 ly (293 ± 2 pc)

Orbit^[3]
Primary	WASP-58A
Companion	WASP-58B
Semi-major axis (a)	1.281±0.002" (384±64 AU)
Details^[4]
WASP-58A
Mass	0.940±0.100 `M`_☉
Radius	1.17±0.13 `R`_☉
Surface gravity (log g)	4.23±0.1^[5] cgs
Temperature	6039±55^[5] K
Metallicity [Fe/H]	-0.09±0.04 dex
Rotation	22.6^+11.7 _−6.1 d^[6]
Rotational velocity (v sin i)	2.8±0.9 km/s
Age	12.80^+0.20 _−2.10 Gyr
WASP-58B
Temperature	3396±53^[3] K
Other designations
Gaia DR2 2115245554756763392, TYC 3525-76-1, 2MASS J18184825+4510192^[7]
Database references
SIMBAD	data