Astronomy:WASP-2

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Short description: Multiple star system in the constellation Delphinus
WASP-2
Observation data
{{#ifeq:J2000.0|J2000.0 (ICRS)|Epoch J2000.0      Equinox J2000.0 (ICRS)| Epoch J2000.0      [[Astronomy:Equinox (celestial coordinates)|Equinox J2000.0}}
Constellation Delphinus
A[1]
Right ascension  20h 30m 54.1279s[2]
Declination +06° 25′ 46.338″[2]
Apparent magnitude (V) +11.98[3]
C[a 1]
Right ascension ~ 20h 30m 54s[1]
Declination ~+06° 25′ 46″[1]
Apparent magnitude (V) 15.38[1]
Orbit[4]
PrimaryWASP-2A
CompanionWASP-2B
Semi-major axis (a)106″
Characteristics
Spectral type K1.5V + K2-M3[5]
Apparent magnitude (B) ~13[3]
Apparent magnitude (V) ~11.98[3]
Apparent magnitude (J) 10.166±0.027[3]
Apparent magnitude (H) 9.752±0.026[3]
Apparent magnitude (K) 9.632±0.024[3]
Astrometry
Proper motion (μ) RA: 5.936±0.101[2] mas/yr
Dec.: −48.279±0.082[2] mas/yr
Parallax (π)6.4980 ± 0.0686[2] mas
Distance502 ± 5 ly
(154 ± 2 pc)
Details[6]
WASP-2A
Mass0.843±0.033 M☉
Radius0.821±0.013 R☉
Temperature5170±60 K
Age7.6+2.5−3.3 Gyr
WASP-2B
Mass0.48[1] M☉
Temperature3523+28−19 K
Other designations
GSC 00522-01199, 1SWASP J203054.12+062546.4, USNO-B1.0 0964-00543604, 2MASS J20305413+0625463, UCAC2 34018636, Gaia DR2 1748596020745038208, V357 Del
Database references
SIMBADdata
Extrasolar Planets
Encyclopaedia		data

WASP-2 is a binary star system in the Delphinus constellation located about 500 light-years away.[3] The primary is magnitude 12 orange dwarf star, orbited by red dwarf star on wide orbit.[4][7] The star system shows an infrared excess noise of unknown origin.[8]

Planetary system

This star has one extrasolar planet WASP-2b, detected by the SuperWASP project in 2006.[9]

The WASP-2 planetary system[6]
Companion
(in order from star) 		Mass Semimajor axis
(AU) 		Orbital period
(days) 		Eccentricity Inclination Radius
b 0.882±0.027 MJ 0.0308±0.0004 2.15222144 (± 4e-07) 0 — 1.06±0.024 RJ

Binary star

In 2008 a study was undertaken of fourteen stars with exoplanets that were originally discovered using the transit method through relatively small telescopes. These systems were re-examined with the 2.2 m (87 in) reflector telescope at the Calar Alto Observatory in Spain . This star system, along with two others, was determined to be a previously unknown binary star system. The previously unknown secondary star is a dim magnitude 15 M-type star separated by about 111 AU from the primary, appearing offset from the primary by about one arc second in the images. This discovery resulted in a recalculation of parameters for both the planet and the primary star.[1]

The re-examination of the WASP-2 spectrum in 2015, have resulted in the measurement of stellar companion temperature equal to 3513±28 K, and angular separation of 0.73 arc second.[10]

See also

Notes

  1. ↑ The secondary star is identified with a "C" suffix so as to not confuse it with the planetary designation suffix "b".[1]

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 1.5 1.6 Daemgen et al. (2009). "Binarity of transit host stars - Implications for planetary parameters". Astronomy and Astrophysics 498 (2): 567–574. doi:10.1051/0004-6361/200810988. Bibcode: 2009A&A...498..567D. http://www.mpia.de/homes/henning/Publications/daemgen.pdf. 
  2. ↑ 2.0 2.1 2.2 2.3 2.4 Brown, A. G. A. (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics 616: A1. doi:10.1051/0004-6361/201833051. Bibcode: 2018A&A...616A...1G.  Gaia DR2 record for this source at VizieR.
  3. ↑ 3.0 3.1 3.2 3.3 3.4 3.5 3.6 "WASP-2". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=WASP-2. 
  4. ↑ 4.0 4.1 Quarles, Billy; Li, Gongjie; Kostov, Veselin; Haghighipour, Nader (2020), "Orbital stability of circumstellar planets in binary systems", The Astronomical Journal 159 (3): 80, doi:10.3847/1538-3881/ab64fa, Bibcode: 2020AJ....159...80Q 
  5. ↑ 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, doi:10.1051/0004-6361/201424091, Bibcode: 2015A&A...575A..23W 
  6. ↑ 6.0 6.1 Southworth, J.; Bohn, A. J.; Kenworthy, M. A.; Ginski, C.; Mancini, L. (2020), "A multiplicity study of transiting exoplanet host stars. II.Revised properties of transiting planetary systems with companions", Astronomy & Astrophysics A74: 635, doi:10.1051/0004-6361/201937334, Bibcode: 2020A&A...635A..74S 
  7. ↑ Precise Differential Analysis of Stellar Metallicities: Application to Solar Analogs Including 16 Cyg A and B
  8. ↑ Sada, Pedro V.; Deming, Drake; Jennings, Donald E.; Jackson, Brian k.; Hamilton, Catrina M.; Fraine, Jonathan; Peterson, Steven W.; Haase, Flynn et al. (2012), "Extrasolar Planet Transits Observed at Kitt Peak National Observatory", Publications of the Astronomical Society of the Pacific 124 (913): 212–229, doi:10.1086/665043, Bibcode: 2012PASP..124..212S 
  9. ↑ 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. doi:10.1111/j.1365-2966.2006.11350.x. Bibcode: 2007MNRAS.375..951C. 
  10. ↑ Piskorz, Danielle; Knutson, Heather A.; Ngo, Henry; Muirhead, Philip S.; Batygin, Konstantin; Crepp, Justin R.; Hinkley, Sasha; Morton, Timothy D. (2015), "Friends of Hot Jupiters. III. An Infrared Spectroscopic Search for Low-Mass Stellar Companions", The Astrophysical Journal 814 (2): 148, doi:10.1088/0004-637X/814/2/148, Bibcode: 2015ApJ...814..148P 

External links

Coordinates: Sky map 20h 30m 54.130s, +06° 25′ 46.37″



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