WASP-54

WASP-54, also known as BD+00 3088, is a binary star system about 825 light-years away. The primary, WASP-54A, is a F-type main-sequence star, accompanied by the red dwarf WASP-54B on a wide orbit. WASP-54 is depleted in heavy elements, having 55% of the solar abundance of iron.^[4] The age of WASP-54 is slightly older than the Sun's at 6.9^+1.0
_−1.9 billion years.^[4]

WASP-54

Observation data Epoch J2000      Equinox J2000
Constellation	Virgo
Right ascension	13h 41m 49.0302s[1]
Declination	−00° 07′ 41.0337″[1]
Apparent magnitude (V)	10.41
Characteristics
Evolutionary stage	Main sequence
Spectral type	F8[2]
Astrometry
Radial velocity (Rv)	-2.82[1] km/s
Proper motion (μ)	RA: -24.685[1] mas/yr Dec.: -4.687[1] mas/yr
Parallax (π)	3.9522 ± 0.0692 mas[1]
Distance	830 ± 10 ly (253 ± 4 pc)
Orbit[3]
Primary	WASP-54A
Companion	WASP-54B
Semi-major axis (a)	5.728±0.006" (1450 AU)
Details[4]
WASP-54A
Mass	1.213±0.032 M☉
Radius	1.828+0.091 −0.081 R☉
Surface gravity (log g)	4.00±0.02[5] cgs
Temperature	6100±100 K
Metallicity [Fe/H]	-0.27±0.08 dex
Rotational velocity (v sin i)	4.0±0.8 km/s
Age	6.9+1.0 −1.9 Gyr
WASP-54B
Mass	0.19±0.01[3] M☉
Temperature	3216+26 −25[3] K
Other designations
BD+00 3088, Gaia DR2 3661983850663908608, TYC 4967-678-1, GSC 04967-00678, 2MASS J13414903-0007410[2]
Database references
SIMBAD	data

A multiplicity survey in 2017 did detect a red dwarf stellar companion WASP-54B 5.7″ away from WASP-54A.^[6] The companion was proven to be co-moving in 2020.^[3]

Planetary system

In 2012 a transiting hot Jupiter planet b was detected on a tight, mildly eccentric^[4] orbit around WASP-54A.^[7]

Planetary equilibrium temperature is 1742+49
−69 K.^[7]

The WASP-54 planetary system^[4]

Companion (in order from star)	Mass	Semimajor axis (AU)	Orbital period (days)	Eccentricity	Inclination	Radius
b	0.606±0.018 MJ	0.04988+0.00043 −0.00045	3.6936411±0.0000059	<0.06	84.97±0.61°	1.653+0.090 −0.083 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. "BD+00 3088". SIMBAD. Centre de données astronomiques de Strasbourg.
3. Bohn, A. J.; Southworth, J.; Ginski, C.; Kenworthy, M. A.; Maxted, P. F. L.; Evans, D. F. (2020), "A multiplicity study of transiting exoplanet host stars. I. High-contrast imaging with VLT/SPHERE", Astronomy & Astrophysics, 635: A73, arXiv:2001.08224, Bibcode:2020A&A...635A..73B, doi:10.1051/0004-6361/201937127, S2CID 210861118
4. Bonomo, A. S.; Desidera, S.; Benatti, S.; Borsa, F.; Crespi, S.; Damasso, M.; Lanza, A. F.; Sozzetti, A.; Lodato, G.; Marzari, F.; Boccato, C.; Claudi, R. U.; Cosentino, R.; Covino, E.; Gratton, R.; Maggio, A.; Micela, G.; Molinari, E.; Pagano, I.; Piotto, G.; Poretti, E.; Smareglia, R.; Affer, L.; Biazzo, K.; Bignamini, A.; Esposito, M.; Giacobbe, P.; Hébrard, G.; Malavolta, L.; 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, A107: 602, arXiv:1704.00373, Bibcode:2017A&A...602A.107B, doi:10.1051/0004-6361/201629882, S2CID 118923163
5. Correcting the spectroscopic surface gravity using transits and asteroseismology No significant effect on temperatures or metallicities with ARES and MOOG in local thermodynamic equilibrium
6. Evans, D. F.; Southworth, J.; Smalley, B.; Jørgensen, U. G.; Dominik, M.; Andersen, M. I.; Bozza, V.; Bramich, D. M.; Burgdorf, M. J.; Ciceri, S.; d'Ago, G.; Figuera Jaimes, R.; Gu, S.-H.; Hinse, T. C.; Henning, Th.; Hundertmark, M.; Kains, N.; Kerins, E.; Korhonen, H.; Kokotanekova, R.; Kuffmeier, M.; Longa-Peña, P.; Mancini, L.; MacKenzie, J.; Popovas, A.; Rabus, M.; Rahvar, S.; Sajadian, S.; Snodgrass, C.; et al. (2017), "High-resolution Imaging of Transiting Extrasolar Planetary systems (HITEP). II. Lucky Imaging results from 2015 and 2016", Astronomy & Astrophysics, 610: A20, arXiv:1709.07476, Bibcode:2018A&A...610A..20E, doi:10.1051/0004-6361/201731855, S2CID 53400492
7. Faedi, F.; Pollacco, D.; Barros, S. C. C.; Brown, D.; Collier Cameron, A.; Doyle, A. P.; Enoch, R.; Gillon, M.; Gómez Maqueo Chew, Y.; Hébrard, G.; Lendl, M.; Liebig, C.; Smalley, B.; Triaud, A. H. M. J.; West, R. G.; Wheatley, P. J.; Alsubai, K. A.; Anderson, D. R.; Armstrong, D.; Bento, J.; Bochinski, J.; Bouchy, F.; Busuttil, R.; Fossati, L.; Fumel, A.; Haswell, C. A.; Hellier, C.; Holmes, S.; Jehin, E.; 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, doi:10.1051/0004-6361/201220520, S2CID 14346225