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 | |
| Component | WASP-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, TOI-6014, TIC 57984377, WASP-1, TYC 2265-107-1, GSC 02265-00107, 2MASS J00204007+3159239[5] | |
| Database references | |
| SIMBAD | data |
| Exoplanet Archive | 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.
Stellar companion
[edit ]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
[edit ]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 the 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]
| 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 | <0.013 | 90.0+0.0 −2.9° |
1.514+0.052 −0.047 RJ |
See also
[edit ]References
[edit ]- ^ 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 f 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 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.
- ^ a b 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.
- ^ a b "TYC 2265-107-1". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 2009年05月20日.
- ^ a b c d e f g h i 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.
- ^ 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.
- ^ 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.
- ^ 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.
- ^ 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.
- ^ 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.
External links
[edit ]- "Planet WASP-1 b". Extrasolar Planets Encyclopaedia . Retrieved 2018年11月07日.
- Image WASP 1