XO-2Nb (XO-2Bb)
Size comparison of XO-2 b (gray) with Jupiter.
Discovery
Discovered byBurke et al.
Discovery date2007
Transit (including secondary eclipse)
Orbital characteristics
0.0369 ± 0.002 AU (5,520,000 ± 300,000 km)
Eccentricity0
2.61586178 ± 0.00000075[1] d
Inclination87.62 ± 0.51[1]
2454147.74902 ± 0.00002
?
Semi-amplitude80.2
StarXO-2N (XO-2B)
Physical characteristics
Mean radius
0.973 ± 0.03 RJ
Mass0.57 ± 0.06 MJ
Mean density
820 kg/m3 (1,380 lb/cu yd)
1.42 m/s2 (4.7 ft/s2)
Temperature1208

    XO-2Nb (or rarely XO-2Bb) is an extrasolar planet orbiting the star XO-2N, the fainter component of XO-2 wide binary star in the constellation Lynx.[2] This planet was found by the 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.[3]

    See also

    References

    1. 1 2 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. S2CID 56545385.
    2. ↑ "XO-2b". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2009-04-26.
    3. ↑ 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. S2CID 13468914.

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