View source for CoRoT-2b

{{Short description|Extrasolar planet in the constellation Aquila}}
{{Use dmy dates|date=September 2019}}

{{Infobox planet
| name                     = CoRoT-2b
| image                    = Exoplanet Comparison CoRoT-2 b.png
| caption                  = Size comparison of CoRoT-2b with Jupiter.
| discoverer               = CoRoT mission
| discovery_site           = Earth's orbit
| discovered               = 2007-12-??, <br />announced 2007-12-20
| discovery_method         = Transit method
| apsis                    = astron
| semimajor                = {{convert|0.0281|±|0.0005|AU|km|abbr=on}}<ref name="Alonso2008"/>
| eccentricity             = 0 (assumed)<ref name="Alonso2008"/>
| period                   = {{val|1.74299705|(15)|ul=days}}<ref name="Kokori2023"/>
| inclination              = 87.84 ± 0.10<ref name="Alonso2008"/>
| star                     = [[CoRoT-2]]
| mean_radius              = 1.429 ± 0.047<ref name="Alonso2008"/> {{Jupiter radius|link=y}}
| mass                     = 3.31 ± 0.16<ref name="Alonso2008"/> {{Jupiter mass|link=y}}
| density                  = {{convert|1310|±|40|kg/m3|g/cm3|disp=out|lk=on|abbr=on}}<ref name="Alonso2008"/>
| surface_grav             = {{convert|38.2|m/s2|lk=on|abbr=on}}<ref>Calculated using Newtonian gravity: <math>\textstyle g=\frac{GM}{R^2}</math></ref>
| albedo                   = <0.12
| single_temperature       = 1537 ± 35 [[Kelvin (unit)|K]]<ref name="Alonso2008"/>
}}
'''CoRoT-2b''' (formerly known as '''CoRoT-Exo-2b'''<ref>{{cite mailing list|url=http://listes.obs.ujf-grenoble.fr/wws/arc/exoplanets/2009-03/msg00003.html|title=Change in CoRoT planets names|author=Schneider, J.|date=10 March 2009|access-date=19 March 2009|mailing-list=Exoplanets|url-status=dead|archive-url=https://archive.today/20100118162658/http://listes.obs.ujf-grenoble.fr/wws/arc/exoplanets/2009-03/msg00003.html|archive-date=18 January 2010}}</ref>) is the second [[extrasolar planet]] to be detected by the French-led [[CoRoT]] mission, and orbits the star [[CoRoT-2]] at a distance of 700 [[light year]]s from [[Earth]] towards the constellation [[Aquila (constellation)|Aquila]]. Its discovery was announced on 20 December 2007.<ref>{{cite web | title = COROT surprises a year after launch | url = http://www.esa.int/SPECIALS/COROT/SEMF0C2MDAF_0.html | access-date = 21 December 2007}}</ref> After its discovery via the [[methods of detecting extrasolar planets|transit method]], its mass was confirmed via the radial velocity method.

== Characteristics ==
[[Image:CoRoT-2 b rv.pdf|thumb|left|275px|The radial velocity trend of CoRoT-2, caused by the presence of CoRoT-2 b.]]

The planet is a large [[hot Jupiter]], about 1.43 times the radius of [[Jupiter]] and approximately 3.3 times as massive. Its huge size is due to the intense heating from its parent star, which causes the outer layers of its atmosphere to bloat. The extremely large radius of the planet indicates that CoRoT-2b is very hot, estimated to be around 1500 K, even hotter than would be expected given its location close to its parent star. This fact may be a sign of [[tidal heating]] due to interactions with another planet.<ref>{{cite web | title = CoRoT-exo-2 c? | date=21 December 2007 | url = http://oklo.org/?p=262 | access-date = 21 December 2007}}</ref> At Jupiter-like distances its radius would roughly be the same as Jupiter.<ref>{{cite journal | title=Planetesimals to Brown Dwarfs: What is a Planet? | date=20 August 2006 | pages=193–216 | author1=Gibor Basri | volume=34 | author2=Brown | doi=10.1146/annurev.earth.34.031405.125058 | journal=Annu. Rev. Earth Planet. Sci. | arxiv=astro-ph/0608417 |bibcode = 2006AREPS..34..193B | s2cid=119338327 }}</ref> The complete phase curve of this planet has been observed.<ref>{{cite journal | bibcode = 2011sptz.prop80044C | title=Phase Variations, Transits and Eclipses of the Misfit CoRoT-2b | journal=Spitzer Proposal | pages=80044 | year=2011 |author1=Cowan, Nicolas |author2=Deming, Drake |author3=Gillon, Michael |author4=Knutson, Heather |author5=Madhusudhan, Nikku |author6=Rauscher, Emily }}</ref>

CoRoT-2b orbits its star approximately once every 1.7 days, and orbits the star in a [[Direct motion|prograde]] direction close to the star's [[equator]].<ref name="bouchy08">{{Cite journal | last1 = Bouchy | first1 = F. | last2 = Queloz | first2 = D. | last3 = Deleuil | first3 = M. | last4 = Loeillet | first4 = B. | last5 = Hatzes | first5 = A. P. | last6 = Aigrain | first6 = S. | last7 = Alonso | first7 = R. | last8 = Auvergne | first8 = M. | last9 = Baglin | first9 = A. | last10 = Barge | first10 = P. | last11 = Benz | first11 = W. | last12 = Bordé | first12 = P. | last13 = Deeg | first13 = H. J. | last14 = De La Reza | first14 = R. | last15 = Dvorak | first15 = R. | last16 = Erikson | first16 = A. | last17 = Fridlund | first17 = M. | last18 = Gondoin | first18 = P. | last19 = Guillot | first19 = T. | last20 = Hébrard | first20 = G. | last21 = Jorda | first21 = L. | last22 = Lammer | first22 = H. | last23 = Léger | first23 = A. | last24 = Llebaria | first24 = A. | last25 = Magain | first25 = P. | last26 = Mayor | first26 = M. | last27 = Moutou | first28 = M. | first29 = M. | last30 = Pepe | first30 = F. | last28 = Ollivier | last29 = Pätzold | first27 = C. | title = Transiting exoplanets from the CoRoT space mission | doi = 10.1051/0004-6361:200809433 | journal = Astronomy and Astrophysics | volume = 482 | issue = 3 | pages = L25 | year = 2008 | display-authors = 29 |arxiv = 0803.3209 |bibcode = 2008A&A...482L..25B | s2cid = 15766192 }}</ref> Its parent star is a [[Stellar classification|G-type]] star, a bit cooler than the [[Sun]] but more [[Solar variation|active]]. It is located about 800 [[light-year]]s from Earth.

As of 2008, the CoRoT-2b spin-orbit angle (that is, the angle between the [[equator]] of the star and the plane of the planet [[orbit]]) was calculated by Bouchy ''et al.'' by means of the [[Rossiter–McLaughlin effect]]<ref>{{cite journal | title= Measuring accurate transit parameters | author=Joshua N. Winn |year=2008 | doi= 10.1017/S174392130802629X|arxiv = 0807.4929 | volume=4 | journal=Proceedings of the International Astronomical Union | pages=99–109 | bibcode=2009IAUS..253...99W| s2cid=34144676 }}</ref> with a value of +7.2 ± 4.5 °.<ref name="bouchy08"/> The spin-orbit angle was revised in 2012 to 4.0{{±|5.9|6.1}}°.<ref>{{citation|arxiv=1206.6105|title=Obliquities of Hot Jupiter Host Stars: Evidence for Tidal Interactions and Primordial Misalignments|year=2012|doi=10.1088/0004-637X/757/1/18 |last1=Albrecht |first1=Simon |last2=Winn |first2=Joshua N. |last3=Johnson |first3=John A. |last4=Howard |first4=Andrew W. |last5=Marcy |first5=Geoffrey W. |last6=Butler |first6=R. Paul |last7=Arriagada |first7=Pamela |last8=Crane |first8=Jeffrey D. |last9=Shectman |first9=Stephen A. |last10=Thompson |first10=Ian B. |last11=Hirano |first11=Teruyuki |last12=Bakos |first12=Gaspar |last13=Hartman |first13=Joel D. |journal=The Astrophysical Journal |volume=757 |issue=1 |page=18 |bibcode=2012ApJ...757...18A |s2cid=17174530 }}</ref>

== References ==
{{reflist|refs=

<ref name="Alonso2008">{{cite journal | title=Transiting exoplanets from the CoRoT space mission. II. CoRoT-Exo-2b: a transiting planet around an active G star | last1=Alonso | first1=R. | last2=Auvergne | first2=M. | last3=Baglin | first3=A. | last4=Ollivier | first4=M. | last5=Moutou | first5=C. | last6=Rouan | first6=D. | last7=Deeg | first7=H. J. | last8=Aigrain | first8=S. | last9=Almenara | first9=J. M. | last10=Barbieri | first10=M. | last11=Barge | first11=P. | last12=Benz | first12=W. | last13=Bordé | first13=P. | last14=Bouchy | first14=F. | last15=de la Reza | first15=R. | last16=Deleuil | first16=M. | last17=Dvorak | first17=R. | last18=Erikson | first18=A. | last19=Fridlund | first19=M. | last20=Gillon | first20=M. | last21=Gondoin | first21=P. | last22=Guillot | first22=T. | last23=Hatzes | first23=A. | last24=Hébrard | first24=G. | last25=Kabath | first25=P. | last26=Jorda | first26=L. | last27=Lammer | first27=H. | last28=Léger | first28=A. | last29=Llebaria | first29=A. | last30=Loeillet | first30=B. | display-authors=1 | journal=Astronomy and Astrophysics | volume=482 | issue=3 | pages=L21–L24 | year=2008 | arxiv=0803.3207 | bibcode=2008A&A...482L..21A | bibcode-access=free | doi=10.1051/0004-6361:200809431 | doi-access=free | s2cid=14288300 }}</ref>

<ref name="Kokori2023">{{cite journal | title=ExoClock Project. III. 450 New Exoplanet Ephemerides from Ground and Space Observations | last1=Kokori | first1=A. | last2=Tsiaras | first2=A. | last3=Edwards | first3=B. | last4=Jones | first4=A. | last5=Pantelidou | first5=G. | last6=Tinetti | first6=G. | last7=Bewersdorff | first7=L. | last8=Iliadou | first8=A. | last9=Jongen | first9=Y. | last10=Lekkas | first10=G. | last11=Nastasi | first11=A. | last12=Poultourtzidis | first12=E. | last13=Sidiropoulos | first13=C. | last14=Walter | first14=F. | last15=Wünsche | first15=A. | last16=Abraham | first16=R. | last17=Agnihotri | first17=V. K. | last18=Albanesi | first18=R. | last19=Arce-Mansego | first19=E. | last20=Arnot | first20=D. | last21=Audejean | first21=M. | last22=Aumasson | first22=C. | last23=Bachschmidt | first23=M. | last24=Baj | first24=G. | last25=Barroy | first25=P. R. | last26=Belinski | first26=A. A. | last27=Bennett | first27=D. | last28=Benni | first28=P. | last29=Bernacki | first29=K. | last30=Betti | first30=L. | display-authors=1 | journal=The Astrophysical Journal Supplement Series | date=14 February 2023 | volume=265 | issue=1 | page=<!-- to prevent citation bot adding nonexistent page number--> | article-number=4 | bibcode=2023ApJS..265....4K | bibcode-access=free | doi=10.3847/1538-4365/ac9da4 | arxiv=2209.09673 | doi-access=free }} [https://vizier.cds.unistra.fr/viz-bin/VizieR-5?-out.add=.&-source=J/ApJS/265/4/table7&recno=4 Vizier catalog entry ]</ref>

}}

== External links ==
{{commonscat-inline|CoRoT-2 b|COROT-2b}}
* [http://www.perseus.gr/Astro-Photometry-CoRoTExo2-20080606.htm COROT-Exo-2 light curve using differential photometry]

{{Sky|19|27|06.5|+|01|23|01.5|930}}
{{Stars of Aquila}}

{{DEFAULTSORT:Corot-2b}}
[[Category:Hot Jupiters]]
[[Category:Transiting exoplanets]]
[[Category:Giant planets]]
[[Category:Exoplanets discovered in 2007]]
[[Category:Exoplanets discovered by CoRoT|2b]]
[[Category:Aquila (constellation)]]