XO-1

XO-1 is a magnitude 11 G-type main-sequence star located approximately 536 light-years away[2] in the constellation Corona Borealis. XO-1 has a mass and radius similar to the Sun. In 2006 the extrasolar planet XO-1b was discovered orbiting XO-1 by the transit method using the XO Telescope.[3]

For the laptop with the same name, see OLPC XO-1.
XO-1

This artist's impression shows a dramatic close-up of the extrasolar planet XO-1b passing in front of a Sun-like star 600 light-years from Earth. The Jupiter-sized planet is in a tight four-day orbit around the star.
Credit: NASA, ESA and G. Bacon (STScI)
Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Corona Borealis[1]
Right ascension 16h 02m 11.8463s[2]
Declination +28° 10′ 10.420″[2]
Apparent magnitude (V) 11.19 ± 0.03[3]
Characteristics
Spectral type G1V[3]
Apparent magnitude (B) 11.85 ± 0.04[3]
Apparent magnitude (V) 11.19 ± 0.03[3]
Apparent magnitude (J) 9.939 ± 0.022[4]
Apparent magnitude (H) 9.601 ± 0.017[4]
Apparent magnitude (K) 9.527 ± 0.015[4]
Variable type Planetary transit variable[3]
Astrometry
Proper motion (μ) RA: −17.422±0.034[2] mas/yr
Dec.: 14.820±0.043[2] mas/yr
Parallax (π)6.0854 ± 0.0230[2] mas
Distance536 ± 2 ly
(164.3 ± 0.6 pc)
Absolute magnitude (MV)5.02+0.14
−0.16[5]
Details
Mass1.027+0.057
−0.061[5] M☉
Radius0.94 ± 0.02[6] R☉
Luminosity0.86+0.12
−0.10[5] L☉
Surface gravity (log g)4.50 ± 0.01[7] cgs
Temperature5738 ± 65[7] K
Metallicity [Fe/H]−0.06 ± 0.07[7] dex
Rotational velocity (v sin i)1.1 ± 1.0[7] km/s
Age1.0+3.1
−0.9[5] Gyr
Other designations
1SWASP J160211.83+281010.4, BD+28 2507, TYC 2041-1657-1, GSC 02041-01657, 2MASS J16021184+2810105[8]
Database references
SIMBADdata

The star XO-1 is named Moldoveanu. The name was selected in the NameExoWorlds campaign by Romania, during the 100th anniversary of the IAU. Moldoveanu is the highest peak in Romania.[9][10][11]

Planetary system

The XO Project is an international team of professional and amateur astronomers which discovered the Jupiter-sized planet orbiting around XO-1. The team, led by Peter McCullough of the Space Telescope Science Institute in Baltimore, includes four amateur astronomers from North America and Europe. The planet was confirmed using the Harlan J. Smith Telescope and Hobby-Eberly Telescope at McDonald Observatory of the University of Texas.[3] An independent confirmation of the planet was made by the Wide Angle Search for Planets project.[12] In 2019, the planet was named Negoiu, after Negoiu Peak in Romania.

Further observations with the NICMOS instrument on board the Hubble Space Telescope detected the presence of water vapor, methane, and carbon dioxide in the atmosphere of XO-1b.[13] However an independent reinvestigation of the same data was unable to reproduce these results.[14]

The XO-1 planetary system[15][16]
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
b/Negoiu 0.907±0.022 MJ 0.04914±0.00045 3.94150514(20) <0.019 88.84±0.22° 1.199±0.017 RJ

See also
  • List of transiting extrasolar planets

References
  1. Roman, Nancy G. (1987). "Identification of a Constellation From a Position". Publications of the Astronomical Society of the Pacific. 99 (617): 695–699. Bibcode:1987PASP...99..695R. doi:10.1086/132034. Vizier query form
  2. Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  3. 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.
  4. Skrutskie, M. F.; et al. (2006). "The Two Micron All Sky Survey (2MASS)". The Astronomical Journal. 131 (2): 1163–1183. Bibcode:2006AJ....131.1163S. doi:10.1086/498708.Vizier catalog entry
  5. Torres, Guillermo; et al. (2008). "Improved Parameters for Extrasolar Transiting Planets". The Astrophysical Journal. 677 (2): 1324–1342. arXiv:0801.1841. Bibcode:2008ApJ...677.1324T. doi:10.1086/529429. S2CID 12899134.
  6. Burke, Christopher J.; et al. (2010). "NICMOS Observations of the Transiting Hot Jupiter XO-1b". The Astrophysical Journal. 719 (2): 1796–1806. arXiv:1006.1953. Bibcode:2010ApJ...719.1796B. doi:10.1088/0004-637X/719/2/1796. S2CID 118798621.
  7. Torres, Guillermo; et al. (2012). "Improved Spectroscopic Parameters for Transiting Planet Hosts". The Astrophysical Journal. 757 (2). 161. arXiv:1208.1268. Bibcode:2012ApJ...757..161T. doi:10.1088/0004-637X/757/2/161. S2CID 16580774.
  8. "TYC 2041-1657-1". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-10-14.
  9. http://www.nameexoworlds.iau.org/romania
  10. "Approved names". NameExoworlds. Retrieved 2020-01-02.
  11. "International Astronomical Union | IAU". www.iau.org. Retrieved 2020-01-02.
  12. Wilson, D. M.; et al. (2006). "SuperWASP Observations of the Transiting Extrasolar Planet XO-1b". The Publications of the Astronomical Society of the Pacific. 118 (847): 1245–1251. arXiv:astro-ph/0607591. Bibcode:2006PASP..118.1245W. doi:10.1086/507957. S2CID 118916713.
  13. Tinetti, G.; et al. (2010). "Probing the Terminator Region Atmosphere of the Hot-Jupiter XO-1b with Transmission Spectroscopy". The Astrophysical Journal Letters. 712 (2): L139–L142. arXiv:1002.2434. Bibcode:2010ApJ...712L.139T. doi:10.1088/2041-8205/712/2/L139. S2CID 118588637.
  14. Gibson, N. P.; et al. (2011). "A new look at NICMOS transmission spectroscopy of HD 189733, GJ-436 and XO-1: no conclusive evidence for molecular features". Monthly Notices of the Royal Astronomical Society. 411 (4): 2199–2213. arXiv:1010.1753. Bibcode:2011MNRAS.411.2199G. doi:10.1111/j.1365-2966.2010.17837.x. S2CID 118506224.
  15. Bonomo, A. S.; et al. (2017). "The GAPS Programme with HARPS-N at TNG . XIV. Investigating giant planet migration history via improved eccentricity and mass determination for 231 transiting planets". Astronomy and Astrophysics. 602. A107. arXiv:1704.00373. Bibcode:2017A&A...602A.107B. doi:10.1051/0004-6361/201629882. S2CID 118923163.
  16. Southworth, John; et al. (2018). "Physical properties and optical-infrared transmission spectrum of the giant planet XO-1 b". Monthly Notices of the Royal Astronomical Society. 481 (3): 4261–4276. arXiv:1809.03775. Bibcode:2018MNRAS.481.4261S. doi:10.1093/mnras/sty2488. S2CID 119503789.

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