Astronomy:WASP-2

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WASP-2 is a binary star system located about 496 light-years away in the Delphinus constellation.[1] The primary is a magnitude 12 orange dwarf star, orbited by a red dwarf star on a wide orbit.[2][3] The star system shows an infrared excess noise of unknown origin.[4]

The primary star hosts one known exoplanet, WASP-2b.[5] Since the planet transits the star, the star is classified as a planetary transit variable and has received the variable star designation V357 Delphini.[6]

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.[7]

A re-examination of the WASP-2 spectrum in 2015 resulted in the measurement of the stellar companion's temperature as 3513±28 K, and an angular separation of 0.73 arcseconds.[8]

Planetary system

The primary star has one exoplanet, WASP-2b, a hot Jupiter detected by the SuperWASP project in 2006 using the transit method.[5]

The WASP-2 planetary system[9][10]
Companion
(in order from star) 		Mass Semimajor axis
(AU) 		Orbital period
(days) 		Eccentricity Inclination Radius
b 0.892±0.027 MJ 0.0308±0.0004 2.15222163(42) <0.013 84.81+0.35
−0.27° 		1.060±0.024 RJ

See also

Notes

References

  1. ↑ "WASP-2". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=WASP-2. 
  2. ↑ 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. 
  3. ↑ Takeda, Yoichi (2005). "Precise Differential Analysis of Stellar Metallicities: Application to Solar Analogs Including 16 Cyg a and B". Publications of the Astronomical Society of Japan 57: 83. doi:10.1093/pasj/57.1.83. Bibcode: 2005PASJ...57...83T. 
  4. ↑ 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. 
  5. ↑ 5.0 5.1 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. 
  6. ↑ "V357 Del". General Catalog of Variable Stars - VizieR. https://vizier.cds.unistra.fr/viz-bin/VizieR-S?V*%20V357%20Del. 
  7. ↑ 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. 
  8. ↑ 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. 
  9. ↑ Bonomo, A. S. et al. (June 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 & Astrophysics 602: A107. doi:10.1051/0004-6361/201629882. Bibcode: 2017A&A...602A.107B. 
  10. ↑ 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. 

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



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