Astronomy:WASP-2b

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WASP-2b
Size comparison of WASP-2b with Jupiter.
Discovery
Discovered byCameron et al. (SuperWASP)
Discovery siteSAAO
Discovery dateSeptember 25, 2006
Transit
Orbital characteristics
0.0308 +0.0004−0.0002[1] AU
Eccentricity<0.013[2]
Orbital period2.15222216 ± 0.00000013[3] d
Inclination84.81 ± 0.17°[3]
astron|astron|helion}}2,456,031.78981±0.000075[3]
267+11
−86[4]
Semi-amplitude156.5±13 m/s[2]
StarWASP-2 A[5]
Physical characteristics
Mean radius1.060+0.024
−0.008[1] |♃|J}}}}}}
Mass0.892+0.027
−0.013[1] |♃|J}}}}}}
Mean density0.701+0.041
−0.005[1] g cm−3
3.279 ± 0.036[5] g
Physics1286 ± 17[1] K


WASP-2b is an extrasolar planet orbiting the star WASP-2 located about 500 light years away in the constellation of Delphinus. It was discovered via the transit method, and then follow up measurements using the radial velocity method confirmed that WASP-2b was a planet. The planet's mass and radius indicate that it is a gas giant with a similar bulk composition to Jupiter. Unlike Jupiter, but similar to many other planets detected around other stars, WASP-2b is located very close to its star, and belongs to the class of planets known as hot Jupiters.[6][7] A 2008 study concluded that the WASP-2b system (among others) is a binary star system allowing even more accurate determination of stellar and planetary parameters.[5]

See also

References

  1. ↑ 1.0 1.1 1.2 1.3 1.4 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. 
  2. ↑ 2.0 2.1 Bonomo, A. S.; Desidera, S.; Benatti, S.; Borsa, F.; Crespi, S.; Damasso, M.; Lanza, A. F.; Sozzetti, A. et al. (2017-06-01). "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. doi:10.1051/0004-6361/201629882. ISSN 0004-6361. Bibcode: 2017A&A...602A.107B. 
  3. ↑ 3.0 3.1 3.2 Kokori, A. et al. (March 1, 2023). "ExoClock Project. III. 450 New Exoplanet Ephemerides from Ground and Space Observations". The Astrophysical Journal Supplement Series 265 (1): 4. doi:10.3847/1538-4365/ac9da4. ISSN 0067-0049. Bibcode: 2023ApJS..265....4K. 
  4. ↑ Knutson, Heather A.; Fulton, Benjamin J.; Montet, Benjamin T.; Kao, Melodie; Ngo, Henry; Howard, Andrew W.; Crepp, Justin R.; Hinkley, Sasha et al. (April 2014). "Friends of Hot Jupiters. I. A Radial Velocity Search for Massive, Long-period Companions to Close-in Gas Giant Planets". The Astrophysical Journal 785 (2): 126. doi:10.1088/0004-637X/785/2/126. Bibcode: 2014ApJ...785..126K. 
  5. ↑ 5.0 5.1 5.2 Daemgen; Hormuth, F.; Brandner, W.; Bergfors, C.; Janson, M.; Hippler, S.; Henning, T. (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. 
  6. ↑ 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. 
  7. ↑ Charbonneau; Winn, Joshua N.; Everett, Mark E.; Latham, David W.; Holman, Matthew J.; Esquerdo, Gilbert A.; O’donovan, Francis T. (2006). "Precise Radius Estimates for the Exoplanets WASP-1b and WASP-2b". The Astrophysical Journal 658 (2): 1322–1327. doi:10.1086/512008. Bibcode: 2007ApJ...658.1322C. http://www.iop.org/EJ/article/0004-637X/658/2/1322/70612.html. 

Coordinates: Sky map 20h 30m 54s, +06° 25′ 46″



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