CoRoT-2b

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CoRoT-2b
Exoplanet Comparison CoRoT-2 b.png
Size comparison of CoRoT-2b with Jupiter.
Discovery
Discovered by CoRoT mission
Discovery site Earth's orbit
Discovery date2007-12-??,
announced 2007-12-20
Transit method
Orbital characteristics
0.0281 ± 0.0005 AU (4,204,000 ± 75,000 km) [1]
Eccentricity 0 (assumed) [1]
1.74299705(15)  d [2]
Inclination 87.84 ± 0.10 [1]
Star CoRoT-2
Physical characteristics
Mean radius
1.429 ± 0.047 [1] RJ
Mass 3.31 ± 0.16 [1] MJ
Mean density
1,310 ± 40  kg/m3 (2,208 ± 67  lb/cu yd) [1]
38.2  m/s2 (125  ft/s2) [3]
Albedo <0.12
Temperature 1537 ± 35 [1]

    CoRoT-2b (formerly known as CoRoT-Exo-2b [4] ) 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 years from Earth towards the constellation Aquila. Its discovery was announced on 20 December 2007. [5] After its discovery via the transit method, its mass was confirmed via the radial velocity method.

    Contents

    Characteristics

    The radial velocity trend of CoRoT-2, caused by the presence of CoRoT-2 b. CoRoT-2 b rv.pdf
    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. [6] At Jupiter-like distances its radius would roughly be the same as Jupiter. [7] The complete phase curve of this planet has been observed. [8]

    CoRoT-2b orbits its star approximately once every 1.7 days, and orbits the star in a prograde direction close to the star's equator. [9] Its parent star is a G-type star, a bit cooler than the Sun but more active. It is located about 800 light-years 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 [10] with a value of +7.2 ± 4.5 degrees. [9] The spin-orbit angle was revised in 2012 to 4.0+5.9
    −6.1    °. [11]

    Related Research Articles

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    <span class="mw-page-title-main">WASP-1b</span> Extrasolar planet in the Andromeda constellation

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    HD 147506, also known as HAT-P-2 and formally named Hunor, is a magnitude 8.7 F8 dwarf star that is somewhat larger and hotter than the Sun. The star is approximately 419 light-years from Earth and is positioned near the keystone of Hercules. It is estimated to be 2 to 3 billion years old, towards the end of its main sequence life. There is one known transiting exoplanet, and a second planet not observed to transit.

    <span class="mw-page-title-main">CoRoT-1b</span> Extrasolar planet orbiting CoRoT-1

    CoRoT-1b is a transiting extrasolar planet approximately 2,630 light-years away in the constellation of Monoceros. The planet was discovered orbiting the yellow dwarf star CoRoT-1 in May 2007. The planet was the first discovery by the French-led CoRoT Mission.

    <span class="mw-page-title-main">HAT-P-6b</span> Extrasolar planet in the Andromeda constellation

    HAT-P-6b is a transiting extrasolar planet discovered by Noyes et al. on October 15, 2007. It is located approximately 910 light-years away in the constellation of Andromeda, orbiting the star HAT-P-6. This hot Jupiter planet orbits with a semi-major axis of about 7.832 gigameters, and takes 92 hours, 28 minutes, 17 seconds and 9 deciseconds to orbit the star. It has true mass of 5.7% greater than Jupiter and a radius 33% greater than Jupiter, corresponding to a density of 0.583 g/cm3, which is less than water.

    <span class="mw-page-title-main">CoRoT-3b</span> Brown dwarf or exoplanet orbiting CoRoT-3

    CoRoT-3b is a brown dwarf or massive extrasolar planet with a mass 21.66 times that of Jupiter. The object orbits an F-type star in the constellation of Aquila. The orbit is circular and takes 4.2568 days to complete. It was discovered by the French-led CoRoT mission which detected the dimming of the parent star's light as CoRoT-3b passes in front of it.

    <span class="mw-page-title-main">CoRoT-5b</span>

    CoRoT-5b is an extrasolar planet orbiting the F type star CoRoT-5. It was first reported by the CoRoT mission team in 2008 using a transit method. This planet has been confirmed by a Doppler follow-up study.

    <span class="mw-page-title-main">CoRoT-7b</span> Hot Super-Earth orbiting CoRoT-7

    CoRoT-7b is an exoplanet orbiting the star CoRoT-7 in the constellation of Monoceros, 489 light-years from Earth. It was first detected photometrically by the French-led CoRoT mission and reported in February 2009. Until the announcement of Kepler-10b in January 2011, it was the smallest exoplanet to have its diameter measured, at 1.58 times that of the Earth and the first potential extrasolar terrestrial planet to be found. The exoplanet has a very short orbital period, revolving around its host star in about 20 hours.

    <span class="mw-page-title-main">CoRoT-1</span> Yellow dwarf star in the constellation Monoceros

    CoRoT-1 is a yellow dwarf main sequence star similar to the Sun. The star is located approximately 2,630 light-years away in the constellation of Monoceros. The apparent magnitude of this star is 13.6, which means it is not visible to the naked eye; however, it can be seen through a medium-sized amateur telescope on a clear, dark night. The first exoplanet discovered in the course of the CoRoT mission orbits this star; it is considered to be a "hot Jupiter", and is approximately as massive as the planet Jupiter itself.

    CoRoT-2 is a yellow dwarf main sequence star a little cooler than the Sun. This star is located approximately 700 light-years away in the constellation of Aquila. The apparent magnitude of this star is 12, which means it is not visible to the naked eye but can be seen with a medium-sized amateur telescope on a clear dark night.

    CoRoT-7 is a binary star system.

    CoRoT-21b is a transiting exoplanet reportedly found by the CoRoT space telescope in 2011. Planetary parameters were published in 2012.

    CoRoT-18b is a transiting Hot Jupiter exoplanet found by the CoRoT space telescope in 2011.

    CoRoT-20b is a transiting exoplanet found by the CoRoT space telescope in 2011.

    References

    1. 1 2 3 4 5 6 7 Alonso, R.; et al. (2008). "Transiting exoplanets from the CoRoT space mission. II. CoRoT-Exo-2b: a transiting planet around an active G star". Astronomy and Astrophysics. 482 (3): L21–L24. arXiv: 0803.3207 . Bibcode: 2008A&A...482L..21A . doi: 10.1051/0004-6361:200809431 . S2CID   14288300.
    2. ↑ Kokori, A.; et al. (14 February 2023). "ExoClock Project. III. 450 New Exoplanet Ephemerides from Ground and Space Observations". The Astrophysical Journal Supplement Series. 265 (1) 4. arXiv: 2209.09673 . Bibcode: 2023ApJS..265....4K . doi: 10.3847/1538-4365/ac9da4 . Vizier catalog entry
    3. ↑ Calculated using Newtonian gravity:
    4. ↑ Schneider, J. (10 March 2009). "Change in CoRoT planets names". Exoplanets (Mailing list). Archived from the original on 18 January 2010. Retrieved 19 March 2009.
    5. ↑ "COROT surprises a year after launch" . Retrieved 21 December 2007.
    6. ↑ "CoRoT-exo-2 c?". 21 December 2007. Retrieved 21 December 2007.
    7. ↑ Gibor Basri; Brown (20 August 2006). "Planetesimals to Brown Dwarfs: What is a Planet?". Annu. Rev. Earth Planet. Sci. 34: 193–216. arXiv: astro-ph/0608417 . Bibcode:2006AREPS..34..193B. doi:10.1146/annurev.earth.34.031405.125058. S2CID   119338327.
    8. ↑ Cowan, Nicolas; Deming, Drake; Gillon, Michael; Knutson, Heather; Madhusudhan, Nikku; Rauscher, Emily (2011). "Phase Variations, Transits and Eclipses of the Misfit CoRoT-2b". Spitzer Proposal: 80044. Bibcode:2011sptz.prop80044C.
    9. 1 2 Bouchy, F.; Queloz, D.; Deleuil, M.; Loeillet, B.; Hatzes, A. P.; Aigrain, S.; Alonso, R.; Auvergne, M.; Baglin, A.; Barge, P.; Benz, W.; Bordé, P.; Deeg, H. J.; De La Reza, R.; Dvorak, R.; Erikson, A.; Fridlund, M.; Gondoin, P.; Guillot, T.; Hébrard, G.; Jorda, L.; Lammer, H.; Léger, A.; Llebaria, A.; Magain, P.; Mayor, M.; Moutou, C.; Ollivier, M.; Pätzold, M.; et al. (2008). "Transiting exoplanets from the CoRoT space mission". Astronomy and Astrophysics. 482 (3): L25. arXiv: 0803.3209 . Bibcode:2008A&A...482L..25B. doi:10.1051/0004-6361:200809433. S2CID   15766192.
    10. ↑ Joshua N. Winn (2008). "Measuring accurate transit parameters". Proceedings of the International Astronomical Union. 4: 99–109. arXiv: 0807.4929 . Bibcode:2009IAUS..253...99W. doi:10.1017/S174392130802629X. S2CID   34144676.
    11. ↑ Albrecht, Simon; Winn, Joshua N.; Johnson, John A.; Howard, Andrew W.; Marcy, Geoffrey W.; Butler, R. Paul; Arriagada, Pamela; Crane, Jeffrey D.; Shectman, Stephen A.; Thompson, Ian B.; Hirano, Teruyuki; Bakos, Gaspar; Hartman, Joel D. (2012), "Obliquities of Hot Jupiter Host Stars: Evidence for Tidal Interactions and Primordial Misalignments", The Astrophysical Journal, 757 (1): 18, arXiv: 1206.6105 , Bibcode:2012ApJ...757...18A, doi:10.1088/0004-637X/757/1/18, S2CID   17174530

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