XO-2b

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XO-2b (XO-2Bb)
Extrasolar planet List of extrasolar planets

Size comparison of XO-2 b (gray) with Jupiter.
Parent star
Star XO-2 (XO-2B)
Constellation Lynx[1]
Right ascension (α) 07h 48m 06.468s [2]
Declination (δ) +50° 13′ 32.96″ [2]
Distance483 ± 33 [3] ly
(148 ± 10 [3] pc)
Spectral type K0V [4]
Orbital elements
Semimajor axis(a) 0.0369 ± 0.002 AU
Eccentricity (e) 0
Orbital period(P) 2.61586178 ± 0.00000075[5] d
Inclination (i) 87.62 ± 0.51[5]°
Argument of
periastron		 (ω) ?°
Time of periastron (T0) 2454147.74902 ± 0.00002 JD
Semi-amplitude (K) 80.2 m/s
Physical characteristics
Mass(m)0.57 ± 0.06 MJ
Radius(r)0.973 ± 0.03 RJ
Density(ρ)820 kg m-3
Surface gravity(g)1.42 m/s²
Temperature (T) 1208 K
Discovery information
Discovery date 2007
Discoverer(s) Burke et al.
Discovery method Transit (including secondary eclipse)
Other detection methods Radial velocity
Discovery status Published
Database references
Extrasolar Planets
Encyclopaedia		data
SIMBADdata

XO-2b (or rarely XO-2Bb) is an extrasolar planet orbiting the star XO-2 (in fact XO-2B to be precise, since XO-2 is wide binary star) in the constellation Lynx.[6] This planet was found by transit method in 2007 by Burke et al. This was the second such planet found by the XO telescope.

The radial velocity of XO-2 over time, caused by the presence of XO-2 b.

Like most planets found by the transit method, it is a roughly Jupiter sized planet that orbits very close to its host star; in this case, it has a surface temperature of about 1200 K, so it belongs to a group of exoplanets known as hot Jupiters. The planet takes 2.6 days to orbit the star at the average distance of 0.0369 AU. The planet has mass of 57% of Jupiter and radius of 97% of Jupiter. The radius is relatively large for its mass, probably due to its intense heating from its nearby star that bloats the planet’s atmosphere. The large radius for its mass gives a low density of 820 kg/m3.[4]

See also

References

  1. ↑ Roman (1987). "Constellation boundaries". Identification of a Constellation From Position. Retrieved 2012-03-03. 
  2. ↑ 2.0 2.1 Hog et al. (2000). "Tyc 3413-5-1". The Tycho-2 Catalogue. Retrieved 2012-01-07. 
  3. ↑ 3.0 3.1 Torres, Guillermo et al. (2008). "Improved Parameters for Extrasolar Transiting Planets". The Astrophysical Journal 677 (2): 1324–1342. arXiv:0801.1841. Bibcode:2008ApJ...677.1324T. doi:10.1086/529429. 
  4. ↑ 4.0 4.1 Burke, Christopher J. et al. (2007). "XO-2b: Transiting Hot Jupiter in a Metal-rich Common Proper Motion Binary". The Astrophysical Journal 671 (2): 2115–2128. arXiv:0705.0003. Bibcode:2007ApJ...671.2115B. doi:10.1086/523087. 
  5. ↑ 5.0 5.1 Sing, D. K. et al. (2011). "Gran Telescopio Canarias OSIRIS transiting exoplanet atmospheric survey: detection of potassium in XO-2b from narrowband spectrophotometry". Astronomy and Astrophysics 527. article number A73. arXiv:1008.4795. Bibcode:2011A&A...527A..73S. doi:10.1051/0004-6361/201015579. 
  6. ↑ XO-2 b "SIMBAD query result:XO-2b -- Extra-solar Planet Candidate". Centre de Données astronomiques de Strasbourg. Retrieved 2009-04-26. 

External links

Media related to XO-2b at Wikimedia Commons

Coordinates: 07h 48m 07s, +50° 13′ 33″

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