View source for WASP-2b

{{Short description|Extrasolar planet in the constellation Delphinus}}
{{Infobox planet
| name                     = WASP-2b
| image                    = Exoplanet Comparison WASP-2 b.png
| caption                  = Size comparison of WASP-2b with Jupiter.
<!-- DISCOVERY           -->
| discoverer               = Cameron et al. ([[SuperWASP]])
| discovery_site           = [[SAAO]]
| discovered               = September 25, 2006
| discovery_method         = Transit
<!-- DESIGNATIONS        -->
<!-- ORBITAL             --> 
| apsis                    = astron
| semimajor                = 0.03138 (± 0.011) [[astronomical unit|AU]]
| eccentricity             = 0
| period                   = 2.15222144 (± 4e-07) [[day|d]]
| inclination              = 84.73 (± 0.19)
| star                     = [[WASP-2]] A<ref name="binary"/>
<!-- PHYS CHARS          --> 
| mean_radius              = 1.079 ± 0.033 {{Jupiter radius|link=y}}
| mass                     = 0.847 ± 0.045 {{Jupiter mass|link=y}}
| surface_grav             = 3.279 ± 0.036<ref name="binary"/> [[g-force|g]]
| single_temperature       = 1253 [[Kelvin|K]]<ref>{{citation|arxiv=2011.07169|title=Multi-color photometry and parameters estimation of Jupiter-sized exoplanets; TRES-3b, WASP-2b and HATP-30b|year=2020|last1=Saeed |first1=M. I. |last2=Goderya |first2=S. N. |last3=Chishtie |first3=F. A. }}</ref>
<!-- ATMOSPHERE          --> 
<!-- NOTES               --> 
}}
'''WASP-2b''' is an [[extrasolar planet]] orbiting the [[star]] [[WASP-2]] located about 500 [[light year]]s away in the [[constellation]] of [[Delphinus]]. It was discovered via the [[methods of detecting extrasolar planets|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 Jupiter]]s.<ref name="Cameron2007"/><ref name="radius">{{cite journal 
| url=http://www.iop.org/EJ/article/0004-637X/658/2/1322/70612.html 
| author= Charbonneau 
| title=Precise Radius Estimates for the Exoplanets WASP-1b and WASP-2b 
| journal=The Astrophysical Journal 
| volume=658 
| issue=2 
| year=2006 
| pages=1322–1327 
| doi=10.1086/512008 
| last2=Winn 
| first2=Joshua N. 
| last3=Everett 
| first3=Mark E. 
| last4=Latham 
| first4=David W. 
| last5=Holman 
| first5=Matthew J. 
| last6=Esquerdo 
| first6=Gilbert A. 
| last7=O’donovan 
| first7=Francis T.
| bibcode=2007ApJ...658.1322C|arxiv = astro-ph/0610589 | s2cid= 14099767 
}}</ref> 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.<ref name="binary">{{cite journal | url=http://www.mpia.de/homes/henning/Publications/daemgen.pdf
| title=Binarity of transit host stars - Implications for planetary parameters
| year=2009
| volume=498 | issue=2
| pages=567–574 
| author=Daemgen
| journal=[[Astronomy and Astrophysics]]
| doi=10.1051/0004-6361/200810988 | last2=Hormuth | first2=F. | last3=Brandner | first3=W. | last4=Bergfors | first4=C. | last5=Janson | first5=M. | last6=Hippler | first6=S. | last7=Henning | first7=T. | bibcode=2009A&A...498..567D|arxiv = 0902.2179 | s2cid=9893376
}}</ref>

==See also==
* [[HD 209458 b]]
* [[WASP-1b]]
* [[SuperWASP]]

==References==
{{Reflist|refs=

<ref name="Cameron2007">{{cite journal | title=WASP-1b and WASP-2b: two new transiting exoplanets detected with SuperWASP and SOPHIE | last1=Cameron | first1=A. Collier | last2=Bouchy | first2=F. | last3=Hébrard | first3=G. | last4=Maxted | first4=P. | last5=Pollacco | first5=D. | last6=Pont | first6=F. | last7=Skillen | first7=I. | last8=Smalley | first8=B. | last9=Street | first9=R. A. | display-authors=1 | journal=[[Monthly Notices of the Royal Astronomical Society]] | volume=375 | issue=3 | pages=951–957 | year=2007 | arxiv=astro-ph/0609688 | bibcode=2007MNRAS.375..951C | doi=10.1111/j.1365-2966.2006.11350.x | doi-access=free | s2cid=735515 }}</ref>

}}

==External links==
{{commonscat-inline|WASP-2 b|WASP-2b}}
* [http://www.newscientistspace.com/article/dn10157-third-puffedup-planet-discovered.html ''NewScientistSpace'': Third 'puffed-up planet' discovered]
* [http://news.bbc.co.uk/1/hi/sci/tech/5378562.stm BBC News article]
* [http://wasp-planets.net/ WASP Planets]

{{Sky|20|30|54|+|06|25|46|470}}

{{Stars of Delphinus}}

{{DEFAULTSORT:WASP-2b}}
[[Category:Exoplanets discovered by WASP]]
[[Category:Exoplanets discovered in 2006]]
[[Category:Giant planets]]
[[Category:Hot Jupiters]]
[[Category:Transiting exoplanets]]
[[Category:Delphinus]]