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	0.082±0.008  AU [3]
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
Mean radius	1.52±0.17  RJ [4]
Mass	1.73±0.20  MJ [2]
Temperature	1,670±25  K [2]

XO-6b is a transiting exoplanet, 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. ^{[5] [6]}

Characteristics

XO-6b is classified as a hot Jupiter. ^[1] The planet has an orbital period of just 3.8 days and an average orbital separation of 0.082 astronomical units. ^{[1] [3] [2]} As of such, it is highly irradiated, with a surface temperature estimated to be around 1,670 K (1,400 °C). ^[2] The planet's mass is estimated at 1.73±0.20  M_J . ^[2] The discovery paper suggested a very large radius of 2.07±0.22  R_J , ^[1] which would make it among the largest known exoplanets, but more recent papers, considering the measurements of the host star's distance by the Gaia satellite, found the radius to be smaller, at around 1.5 R_J. ^{[3] [4]}

Host star

XO-6

Observation data Epoch J2000       Equinox J2000
Constellation	Camelopardalis [7]
Right ascension	06h 19m 10.3709s [8]
Declination	+73° 49′ 39.587″ [8]
Apparent magnitude  (V)	10.247±0.004 [9]
Characteristics
Evolutionary stage	Main sequence [8]
Spectral type	F5 [1]
Variable type	Planetary transit variable [1]
Astrometry
Radial velocity (Rv)	2.5±0.9 [8] km/s
Proper motion (μ)	RA: −16.628 mas/yr [8] Dec.: −22.275 mas/yr [8]
Parallax (π)	4.3131±0.0232  mas [8]
Distance	756 ± 4  ly (232 ± 1  pc) [8]
Details
Mass	1.297±0.040 [4]   M☉
Radius	1.417±0.029 [4]   R☉
Luminosity	3.36 [8]   L☉
Surface gravity (log g)	4.291±0.091 [9]   cgs
Temperature	6,724±164 [9]   K
Age	1.89±0.46 [4]   Gyr
Other designations
BD+73°323, TOI-1651, TIC 138168780
Database references
SIMBAD	data

XO-6b orbits XO-6, a faint 10th magnitude star in the constellation Camelopardalis. ^[7] 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 ^{[1] [8]} with about 1.30 times the mass of the Sun. It is also radiating three times as bright, ^[8] and is 1.4 times the size of the Sun. ^[4] It is also hotter, with a temperature of 6724  K , ^[9] which gives it the typical hue of an F-type star. ^[10] Unlike most other stars of its kind, XO-6 rotates rapidly at a rate of 43 km/s.^{[ citation needed ]}

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. Johns, Daniel; Marti, Connor; Huff, Madison; McCann, Jacob; Wittenmyer, Robert A.; Horner, Jonathan; Wright, Duncan J. (November 2018). "Revised Exoplanet Radii and Habitability Using Gaia Data Release 2". The Astrophysical Journal Supplement Series. 239 (1): 14. arXiv: 1808.04533 . Bibcode:2018ApJS..239...14J. doi: 10.3847/1538-4365/aae5fb . ISSN   0067-0049.
4. Collaboration, Gaia; Creevey, O. L.; Sarro, L. M.; Lobel, A.; Pancino, E.; Andrae, R.; Smart, R. L.; Clementini, G.; Heiter, U.; Korn, A. J.; Fouesneau, M.; Frémat, Y.; De Angeli, F.; Vallenari, A.; Harrison, D. L. (June 2023). "Gaia Data Release 3. A golden sample of astrophysical parameters". Astronomy and Astrophysics. 674: A39. arXiv: 2206.05870 . Bibcode:2023A&A...674A..39G. doi:10.1051/0004-6361/202243800. ISSN   0004-6361.
5. 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
6. "The Extrasolar Planet Encyclopaedia — XO-6 b". Extrasolar Planets Encyclopaedia . 2016. Retrieved 2021-02-18.
7. Roman, Nancy G. (1987). "Identification of a constellation from a position". Publications of the Astronomical Society of the Pacific . 99 (617): 695. Bibcode:1987PASP...99..695R. doi: 10.1086/132034 . Constellation record for this object at VizieR .
8. Vallenari, A.; et al. (Gaia collaboration) (2023). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy and Astrophysics. 674: A1. arXiv: 2208.00211 . Bibcode:2023A&A...674A...1G. doi: 10.1051/0004-6361/202243940 . S2CID   244398875. Gaia DR3 record for this source at VizieR.
9. Simpson, Emilie R.; Fetherolf, Tara; Kane, Stephen R.; Pepper, Joshua; Močnik, Teo; Dalba, Paul A. (August 2023). "Variability of Known Exoplanet Host Stars Observed by TESS". The Astronomical Journal. 166 (2): 72. arXiv: 2305.09687 . Bibcode:2023AJ....166...72S. doi: 10.3847/1538-3881/acda26 . ISSN   0004-6256.
10. "The Colour of Stars". Australia Telescope, Outreach and Education. Commonwealth Scientific and Industrial Research Organisation. December 21, 2004. Archived from the original on 2013-12-03. Retrieved 2012-01-16.

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.