XO Telescope

The XO Telescope is an astronomical telescope located on the 3,054 m (10,000 foot) summit of Haleakala on Maui, Hawaii. It consists of two 200-millimeter telephoto camera lenses, and resembles binoculars in shape. It is used by the XO Project to detect extrasolar planets using the transit method. It is similar to the TrES survey telescope. The construction of the one-of-a-kind telescope cost $60,000 for the hardware, and much more than that for the associated software.^[1]

Planets discovered[]

The XO telescope has discovered six objects so far, five are hot Jupiter planets and one, XO-3b, may be a brown dwarf. All were discovered using the transit method.

Light green rows indicate that the planet orbits one of the stars in a binary star system.

Star	Constellation	Right ascension	Declination	App. mag.	Distance (ly)	Spectral type	Planet	Mass (`M`_J)	Radius (`R`_J)	Orbital period (d)	Semimajor axis (AU)	Orbital eccentricity	Inclination (°)	Discovery year
XO-1^[2]	Corona Borealis	16^h 02^m 12^s	+28° 10′ 11″	11.319	600	G1V	XO-1b	0.9	1.3	3.941534	0.0488	0	87.7	2006
XO-2N^[3]	Lynx	07^h 48^m 07^s	+50° 13′ 33″	11.25	486	K0V	XO-2Nb	0.57	0.973	2.615838	0.0369	0	88.58	2007
XO-3^[4]	Camelopardalis	04^h 21^m 53^s	+57° 49′ 01″	9.91	850	F5V	XO-3b	11.79	1.217	3.1915239	0.0454	0.26	84.2	2007
XO-4^[5]	Lynx	07^h 21^m 33.1657^s	+58° 16′ 05.005″	10.78	956	F5V	XO-4b	1.72	1.34	4.12502	0.0555	0.0024	88.7	2008
XO-5^[6]	Lynx	07^h 46^m 51.959^s	+39° 05′ 40.47″	12.1	881	G8V	XO-5b	1.15	1.15	4.187732	0.0508	0.0029	86.8	2008
XO-6^[7]	Camelopardalis	6^h 19^m 10.31^s	+73° 49′ 39.24″	10.28	760	F5V	XO-6b	4.4	2.07	3.76	0.082	0	86.0	2016
	Draco	18^h 29^m 52.30^s	85° 13′ 59.58″	10.52	763	G0V		0.71	1.373	2.8641424	0.04421	0.038	83.45	2019

Other Ground-Based Transit Surveys[]

Next-Generation Transit Survey
Trans-Atlantic Exoplanet Survey or TrES
HATNet Project or HAT
Kilodegree Extremely Little Telescope or KELT
SuperWASP or WASP

References[]

^ McCullough, P. R.; et al. (2005). "The XO Project: Searching for Transiting Extrasolar Planet Candidates". Publications of the Astronomical Society of the Pacific. 117 (834): 783–795. arXiv:astro-ph/0505560. Bibcode:2005PASP..117..783M. doi:10.1086/432024. S2CID 16972795.
^ McCullough, P. R.; et al. (2006). "A Transiting Planet of a Sun-like Star". The Astrophysical Journal. 648 (2): 1228–1238. arXiv:astro-ph/0605414. Bibcode:2006ApJ...648.1228M. doi:10.1086/505651. S2CID 8100425.
^ 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.
^ Johns-Krull, Christopher M.; et al. (2008). "XO-3b: A Massive Planet in an Eccentric Orbit Transiting an F5V Star". The Astrophysical Journal. 677 (1): 657–670. arXiv:0712.4283. Bibcode:2008ApJ...677..657J. doi:10.1086/528950. S2CID 15342571.
^ McCullough, P. R.; et al. (2008). "XO-4b: An Extrasolar Planet Transiting an F5V Star". arXiv:0805.2921 [astro-ph].
^ Burke, Christopher J.; et al. (2008). "XO-5b: A Transiting Jupiter-sized Planet with a 4 day Period". The Astrophysical Journal. 686 (2): 1331–1340. arXiv:0805.2399. Bibcode:2008ApJ...686.1331B. doi:10.1086/591497. S2CID 14043772.
^ 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.