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XO-2Nb

Hot Jupiter

Field	Value
name	XO-2Nb (XO-2Bb)
image	Exoplanet Comparison XO-2 b.png
caption	Size comparison of XO-2 b (gray) with Jupiter.
discoverer	Burke et al.
discovered	2007
discovery_method	Transit (including secondary eclipse)
apsis	astron
semimajor	0.0369 ±
eccentricity	0
period	2.61586178 ± 0.00000075 d
inclination	87.62 ± 0.51
time_periastron	2454147.74902 ± 0.00002
arg_peri	?
semi-amplitude	80.2
star	XO-2N (XO-2B)
mean_radius	0.973 ± 0.03
mass	0.57 ± 0.06
density	820 kg/m3
surface_grav	1.42 m/s2
single_temperature	1208 K

| semi-amplitude = 80.2 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.{{cite simbad | access-date=2009-04-26 }} 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.

References

(2007). "XO-2b: Transiting Hot Jupiter in a Metal-rich Common Proper Motion Binary". The Astrophysical Journal.
(2011). "Gran Telescopio Canarias OSIRIS transiting exoplanet atmospheric survey: detection of potassium in XO-2b from narrowband spectrophotometry". Astronomy and Astrophysics.

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lynx-(constellation) hot-jupiters transiting-exoplanets exoplanets-discovered-in-2007 giant-planets

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