WASP-1

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WASP-1
WASP-1.jpg
Telescope photo of WASP-1
Observation data
Epoch J2000       Equinox J2000
Constellation Andromeda [1]
Right ascension 00h 20m 40.0746s [2]
Declination +31° 59′ 23.955″ [2]
Apparent magnitude  (V)11.68 ± 0.05 [3]
Characteristics
WASP-1A
Evolutionary stage main-sequence star
Spectral type F7V [4]
Apparent magnitude  (B)~12.0 [5]
Apparent magnitude  (V)11.68 ± 0.05 [3]
WASP-1B
Apparent magnitude  (H)15.130 ± 0.046 [6]
Apparent magnitude  (K)15.116 ± 0.055 [6]
Astrometry
WASP-1A
Radial velocity (Rv)−13.90(59) [2] km/s
Proper motion (μ)RA: −4.692(22) mas/yr [2]
Dec.: −3.320(20) mas/yr [2]
Parallax (π)2.6108±0.0218  mas [2]
Distance 1,250 ± 10  ly
(383 ± 3  pc)
Absolute magnitude  (MV)3.63+0.13
−0.14 [3]
Details [3]
WASP-1A
Mass 1.301+0.049
−0.047  M☉
Radius 1.515+0.052
−0.045  R☉
Luminosity 2.88+0.36
−0.30  L☉
Surface gravity (log g)4.190+0.020
−0.022  cgs
Temperature 6110±75  K
Metallicity [Fe/H]0.26±0.08  dex
Age 3.0±0.6  Gyr
WASP-1B
Mass ~0.3 [6] : 13   M☉
Surface gravity (log g)~4.97 [6] : 13   cgs
Temperature ~3400 [6] : 13   K
Position (relative to WASP-1A) [6] : 11, 13 
ComponentWASP-1B
Epoch of observation 2013–2014
Angular distance ~4.58″
Position angle ~1.9°
Projected separation 1587+160
−16 AU
Other designations
1SWASP J002040.07+315923.7, USNO-B1.0 1219-00005465, Gaia DR2 2862548428079638912, TYC 2265-107-1, GSC 02265-00107, 2MASS J00204007+3159239 [5]
Database references
SIMBAD data

WASP-1 is a magnitude 12 binary star system located about 1,250 light-years away [2] in the Andromeda constellation. [7] The binary system consists of a metal-rich F-type main-sequence star, named WASP-1A, and a distant low-mass star, named WASP-1B. WASP-1A has one known transiting hot Jupiter exoplanet named WASP-1b.

Contents

Stellar companion

WASP-1A has a distant companion star, named WASP-1B. WASP-1B is a low-mass star that is around 0.3 times as massive as the Sun and has an effective temperature of about 3400 K. [6] : 24  WASP-1B is located northward of WASP-1A at an angular separation of about 4.6  arcseconds, corresponding to a projected distance of 1587 AU. [6] : 13, 15  WASP-1B was first identified in observations from 2006 and confirmed in further observations from 2012 to 2014, which showed that it shares the proper motion of WASP-1A, indicating the two stars are gravitationally bound to each other. [6] : 15 

Planetary system

In 2006, an extrasolar planet was discovered by the Wide Angle Search for Planets team using the transit method. [4] The planet has a density of 0.31 to 0.40 g/cm3, making it about half as dense as Saturn, and one third as dense as water. The orbit of WASP-1b is inclined to rotational axis of the star by 79.0+4.3
−4.5 degrees, making it a nearly "polar" orbit. [8]

Two searches for additional planets using transit-timing variations have yielded negative results. [9] [10]

The WASP-1 planetary system [11]
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
b 0.948+0.029
−0.028  MJ 		0.03958+0.00047
−0.00049		2.51994480±0.00000050<0.01390.0+0.0
−2.9 ° 		1.514+0.052
−0.047  RJ

See also

References

  1. ↑ Roman, Nancy G. (1987). "Identification of a Constellation From a Position". Publications of the Astronomical Society of the Pacific. 99 (617): 695–699. Bibcode:1987PASP...99..695R. doi: 10.1086/132034 . Vizier query form
  2. 1 2 3 4 5 6 7 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.
  3. 1 2 3 4 Torres, Guillermo; Winn, Joshua N.; Holman, Matthew J. (2008). "Improved Parameters for Extrasolar Transiting Planets". The Astrophysical Journal. 677 (2): 1324–1342. arXiv: 0801.1841 . Bibcode:2008ApJ...677.1324T. doi:10.1086/529429. S2CID   12899134.
  4. 1 2 Cameron, A. Collier; et al. (2007). "WASP-1b and WASP-2b: two new transiting exoplanets detected with SuperWASP and SOPHIE". Monthly Notices of the Royal Astronomical Society. 375 (3): 951–957. arXiv: astro-ph/0609688 . Bibcode:2007MNRAS.375..951C. doi: 10.1111/j.1365-2966.2006.11350.x . S2CID   735515.
  5. 1 2 "TYC 2265-107-1". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 2009-05-20.
  6. 1 2 3 4 5 6 7 8 9 Ngo, Henry; Knutson, Heather A.; Hinkley, Sasha; Crepp, Justin R.; Bechter, Eric B.; Batygin, Konstantin; et al. (February 2015). "Friends of Hot Jupiters. II. No Correspondence between Hot-jupiter Spin-Orbit Misalignment and the Incidence of Directly Imaged Stellar Companions". The Astrophysical Journal. 800 (2): 22. arXiv: 1501.00013 . Bibcode:2015ApJ...800..138N. doi: 10.1088/0004-637X/800/2/138 . 138.{{cite journal}}: CS1 maint: year (link)
  7. ↑ Stempels, H. C.; et al. (2007). "WASP-1: a lithium- and metal-rich star with an oversized planet". Monthly Notices of the Royal Astronomical Society. 379 (2): 773–778. arXiv: 0705.1677 . Bibcode:2007MNRAS.379..773S. doi: 10.1111/j.1365-2966.2007.11976.x . S2CID   17565024.
  8. ↑ Simpson, E. K.; Pollacco, D.; Cameron, A. Collier; Hébrard, G.; Anderson, D. R.; Barros, S. C. C.; Boisse, I.; Bouchy, F.; Faedi, F.; Gillon, M.; Hebb, L.; Keenan, F. P.; Miller, G. R. M.; Moutou, C.; Queloz, D.; Skillen, I.; Sorensen, P.; Stempels, H. C.; Triaud, A.; Watson, C. A.; Wilson, P. A. (2011). "The spin-orbit angles of the transiting exoplanets WASP-1b, WASP-24b, WASP-38b and HAT-P-8b from Rossiter-Mc Laughlin observations★". Monthly Notices of the Royal Astronomical Society. 414 (4): 3023–3035. arXiv: 1011.5664 . Bibcode:2011MNRAS.414.3023S. doi: 10.1111/j.1365-2966.2011.18603.x . S2CID   46522188.
  9. ↑ Granata, V.; et al. (2014). "TASTE IV: Refining ephemeris and orbital parameters for HAT-P-20b and WASP-1b". Astronomische Nachrichten. 335 (8): 797–803. arXiv: 1405.3288 . Bibcode:2014AN....335..797G. doi:10.1002/asna.201412072. S2CID   118341059.
  10. ↑ Maciejewski, G.; et al. (2014). "Revisiting Parameters for the WASP-1 Planetary System" (PDF). Acta Astronomica. 64 (1): 11–26. arXiv: 1402.6518 . Bibcode:2014AcA....64...27M.
  11. ↑ Bonomo, A. S.; et al. (2017). "The GAPS Programme with HARPS-N at TNG . XIV. Investigating giant planet migration history via improved eccentricity and mass determination for 231 transiting planets". Astronomy and Astrophysics. 602. A107. arXiv: 1704.00373 . Bibcode:2017A&A...602A.107B. doi:10.1051/0004-6361/201629882. S2CID   118923163.
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