XO-6b

XO-6

Jupiter compared to XO-6b
Discovery[1]
Discovery site	Haleakalā Observatory in Maui, Hawaii
Discovery date	December 8th, 2016
Detection method	Transit
Orbital characteristics[2]
Semi-major axis	0.0412±0.002 AU
Eccentricity	0.00 (fixed)[1]
Orbital period (sidereal)	3.7649923+45 −46 d
Inclination	84.77°+0.82° −0.66°
Time of periastron	2,458,843.93943±0.00012 JD[1]
Semi-amplitude	<450 m/s[1]
Physical characteristics[2]
Mean radius	2.17±0.20 RJ
Mass	1.73±0.20 MJ
Temperature	1,670±25 K

XO-6b is a transiting exoplanet, a hot Jupiter, orbiting the star XO-6 around 760 light years (230 parsecs) away from Earth. It was discovered in 2016 by the XO planet search team.^[3][4]

Physical properties

XO-6b is one of the puffiest planets ever discovered, with a maximum mass of 4.4 times of Jupiter. It is over twice as wide, making it one of the largest exoplanets ever found (see list of largest exoplanets). Later estimates, however, make it around two times the mass of Jupiter.^[3][4]

XO-6b has a tight orbit, which means a year on it is only about 4 days. XO-6 is slightly more than one-tenth as far from its host star as Mercury is to the sun.

XO-6

XO-6b orbits XO-6, a faint 10th magnitude star in the constellation Camelopardalis.^[5] Due to its magnitude, this star is too faint to be seen with the naked eye, but can be seen with a telescope.^{[citation needed]} XO-6 is a F-type main-sequence star with about 1.5 times the mass of the Sun. It is also radiating 4 times as bright, and is almost twice the size of the Sun. It is also hotter, with a temperature of 6720 kelvins, which gives it the typical hue of an F-type star.^[3] Unlike most other stars of its kind, XO-6 rotates rapidly at a rate of 43 km/s.

References

1. Crouzet, N.; et al. (2017). "Discovery of XO-6b: A Hot Jupiter Transiting a Fast Rotating F5 Star on an Oblique Orbit". The Astronomical Journal. 153 (3). 94. arXiv:1612.02776. Bibcode:2017AJ....153...94C. doi:10.3847/1538-3881/153/3/94. S2CID 119082666.
2. Saha, Suman (2024-09-01). "Precise Transit Photometry Using TESS. II. Revisiting 28 Additional Transiting Systems with Updated Physical Properties". The Astrophysical Journal Supplement Series. 274 (1): 13. arXiv:2407.20846. Bibcode:2024ApJS..274...13S. doi:10.3847/1538-4365/ad6a60. ISSN 0067-0049.
3. Brown, A. G. A; et al. (2016). "Gaia Data Release 1. Summary of the astrometric, photometric, and survey properties". Astronomy and Astrophysics. 595. A2. arXiv:1609.04172. Bibcode:2016A&A...595A...2G. doi:10.1051/0004-6361/201629512. S2CID 1828208.Gaia Data Release 1 catalog entry
4. "The Extrasolar Planet Encyclopaedia — XO-6 b". Extrasolar Planets Encyclopaedia. 2016. Retrieved 2021-02-18.
5. "Find the constellation which contains given sky coordinates". djm.cc. Retrieved 2021-02-14.

Further reading

• Garai, Zoltán; et al. (January 2020). "Periodic transit timing variations and refined system parameters of the exoplanet XO-6b". Monthly Notices of the Royal Astronomical Society. 491 (2): 2760–2769. arXiv:1911.07054. Bibcode:2020MNRAS.491.2760G. doi:10.1093/mnras/stz3235.
• Ridden-Harper, Andrew; Turner, Jake D.; Jayawardhana, Ray (December 2020). "TESS Observations of the Hot Jupiter Exoplanet XO-6b: No Evidence of Transit Timing Variations". The Astronomical Journal. 160 (6): 249. arXiv:2009.10781. Bibcode:2020AJ....160..249R. doi:10.3847/1538-3881/abba1e. S2CID 221856652.