View source for WASP-1b

{{Short description|Extrasolar planet in the Andromeda constellation}}
{{Infobox planet
| name                     = WASP-1b
| image                    = Exoplanet Comparison WASP-1 b.png
| caption                  = Size comparison of WASP-1b with Jupiter
<!-- DISCOVERY           -->
| discoverer               = Cameron et al. ([[SuperWASP]]<br>and [[SOPHIE échelle spectrograph|SOPHIE]])<br>{{flag|South Africa}}<br>and {{flag|France}}
| discovery_site           = [[SAAO]]
| discovered               = September 25, 2006
| discovery_method         = [[Astronomical transit|Transit]]
<!-- DESIGNATIONS        -->
<!-- ORBITAL             --> 
| apsis                    = astron
| semimajor                = 0.0382 (± 0.0013) [[astronomical unit|AU]]
| eccentricity             = 0
| period                   = 2.5199464 (± 8e-07) [[day|d]]
| inclination              = 88.65 (± 0.55)
| star                     = [[WASP-1]]
<!-- PHYS CHARS          --> 
| mean_radius              = 1.484 {{±|0.06|0.09}} {{Jupiter radius|link=y}}
| mass                     = 0.86 ± 0.07 {{Jupiter mass|link=y}}
| density                  = {{cvt|476|kg/m3|g/cm3|lk=on|disp=out}}{{fact|date=July 2024}}
| surface_grav             = {{cvt|12.5|m/s2|lk=on}}<br>1.27 [[g-force|g]]
| single_temperature       = 1,800 K
<!-- ATMOSPHERE          --> 
<!-- NOTES               --> 
}}
'''WASP-1b''' is an [[extrasolar planet]] orbiting the [[star]] [[WASP-1]] located 1,300 [[light-year]]s away in the [[constellation]] [[Andromeda (constellation)|Andromeda]].

==Orbit and mass==
[[Image:WASP-1 b rv.pdf|thumb|left|275px|The radial velocity trend of WASP-1, caused by the presence of WASP-1 b]]

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-1b is located very close to its star, and belongs to the class of planets known as [[hot Jupiter]]s.

WASP-1 b was discovered via the [[methods of detecting extrasolar planets|transit method]] by [[SuperWASP]], for which the star and planet are named. Follow-up radial velocity measurements confirmed the presence of an unseen companion, and allowed for the mass of WASP-1 b to be determined.<ref name="Cameron2007"/>

In 2018, it was discovered via observations of the [[Rossiter-McLaughlin effect]] that the orbit of WASP-1b is strongly misaligned with rotational axis of the star by 79.0{{±|4.3|4.5}} degrees, making it a nearly "polar" orbit.<ref>{{cite journal|arxiv=1011.5664|doi=10.1111/j.1365-2966.2011.18603.x|title=The spin-orbit angles of the transiting exoplanets WASP-1b, WASP-24b, WASP-38b and HAT-P-8b from Rossiter-Mc ''Laughlin'' observations★|year=2011|last1=Simpson|first1=E. K.|last2=Pollacco|first2=D.|last3=Cameron|first3=A. Collier|last4=Hébrard|first4=G.|last5=Anderson|first5=D. R.|last6=Barros|first6=S. C. C.|last7=Boisse|first7=I.|last8=Bouchy|first8=F.|last9=Faedi|first9=F.|last10=Gillon|first10=M.|last11=Hebb|first11=L.|last12=Keenan|first12=F. P.|last13=Miller|first13=G. R. M.|last14=Moutou|first14=C.|last15=Queloz|first15=D.|last16=Skillen|first16=I.|last17=Sorensen|first17=P.|last18=Stempels|first18=H. C.|last19=Triaud|first19=A.|last20=Watson|first20=C. A.|last21=Wilson|first21=P. A.|journal=Monthly Notices of the Royal Astronomical Society|volume=414|issue=4|pages=3023–3035|doi-access=free |bibcode=2011MNRAS.414.3023S|s2cid=46522188}}</ref>
{{clearleft}}
==See also==
* [[HD 209458 b]]
* [[WASP-2b]]

==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. | last10=West | first10=R. G. | last11=Wilson | first11=D. M. | last12=Aigrain | first12=S. | last13=Christian | first13=D. J. | last14=Clarkson | first14=W. I. | last15=Enoch | first15=B. | last16=Evans | first16=A. | last17=Fitzsimmons | first17=A. | last18=Fleenor | first18=M. | last19=Gillon | first19=M. | last20=Haswell | first20=C. A. | last21=Hebb | first21=L. | last22=Hellier | first22=C. | last23=Hodgkin | first23=S. T. | last24=Horne | first24=K. | last25=Irwin | first25=J. | last26=Kane | first26=S. R. | last27=Keenan | first27=F. P. | last28=Loeillet | first28=B. | last29=Lister | first29=T. A. | last30=Mayor | first30=M. | 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>
}}

==Further reading==
* {{cite journal | title = Precise Radius Estimates for the Exoplanets WASP-1b and WASP-2b | journal = The Astrophysical Journal | volume=658 | issue=2 | year=2007 | pages=1322–1327 | doi = 10.1086/512008 | bibcode=2007ApJ...658.1322C|arxiv = astro-ph/0610589 | last1 = Charbonneau | first1 = David | 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. | s2cid = 14099767 }}
* {{cite journal | title = Photometric follow-up of the transiting planet around WASP-1 | journal = [[Monthly Notices of the Royal Astronomical Society]] | volume=376 | issue=3 | year=2007 | pages=1296–1300 | doi = 10.1111/j.1365-2966.2007.11537.x | bibcode=2007MNRAS.376.1296S|arxiv = astro-ph/0610556 | last1 = Shporer | first1 = A. | last2 = Tamuz | first2 = O. | last3 = Zucker | first3 = S. | last4 = Mazeh | first4 = T. | doi-access = free | s2cid = 12694181 }}

==External links==
{{commonscat-inline|WASP-1 b|WASP-1b}}
* {{cite encyclopedia | title=Planet WASP-1 b | url=https://exoplanet.eu/catalog/wasp_1_b--346/ | encyclopedia=[[Extrasolar Planets Encyclopaedia]] | access-date=2018-11-07}}
* [http://news.bbc.co.uk/1/hi/sci/tech/5378562.stm BBC News article]
* [http://wasp-planets.net/ WASP Planets]

{{Sky|00|20|40|+|31|59|24|1239}}

{{Stars of Andromeda}}

{{DEFAULTSORT:WASP-1b}}
[[Category:Exoplanets discovered by WASP]]
[[Category:Exoplanets discovered in 2006]]
[[Category:Giant planets]]
[[Category:Hot Jupiters]]
[[Category:Transiting exoplanets]]
[[Category:Andromeda (constellation)]]