Astronomy:XO-2 (star)

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Short description: Binary star system in the constellation Lynx
XO-2
Observation data
{{#ifeq:J2000|J2000.0 (ICRS)|Epoch J2000.0      Equinox J2000.0 (ICRS)| Epoch J2000      [[Astronomy:Equinox (celestial coordinates)|Equinox J2000}}
Constellation Lynx[1]
XO-2S
Right ascension  07h 48m 07.4814s[2]
Declination +50° 13′ 03.2554″[2]
Apparent magnitude (V) 11.12±0.03[3]
XO-2N
Right ascension  07h 48m 06.4723s[4]
Declination +50° 13′ 32.9206″[4]
Apparent magnitude (V) 11.18±0.03[3]
Characteristics
Spectral type K0V + K0V[3]
Astrometry
XO-2S
Proper motion (μ) RA: −29.308(15)[2] mas/yr
Dec.: −154.233(13)[2] mas/yr
Parallax (π)6.6721 ± 0.0151[2] mas
Distance489 ± 1 ly
(149.9 ± 0.3 pc)
Absolute magnitude (MV)5.74[5]
XO-2N
Proper motion (μ) RA: −29.552(15) mas/yr
Dec.: −154.227(11) mas/yr
Parallax (π)6.6588 ± 0.0158[4] mas
Distance490 ± 1 ly
(150.2 ± 0.4 pc)
Absolute magnitude (MV)5.74[5]
Details
XO-2S
Mass0.982 ± 0.034[6] M☉
Radius1.02[6] R☉
Temperature5399 ± 55 [6] K
Metallicity [Fe/H]0.39 ± 0.05[6] dex
Age7.1 ± +2.5−2.9[6] Gyr
XO-2N
Mass0.971 ± 0.034[7] M☉
Radius0.976+0.024−0.016[7] R☉
Temperature5340 ± 32[3] K
Age6.3 ± 2.4[7] Gyr
Other designations
XO-2S: LSPM J0748+5013S, TYC 3413-210-1, GSC 03413-00210, 2MASS J07480748+5013032[8]
XO-2N: LSPM J0748+5013N, TYC 3413-5-1, GSC 03413-00005, 2MASS J07480647+5013328[9]
Database references
SIMBADXO-2S
XO-2N

XO-2 is a binary star. It consists of two components: XO-2S (also known as XO-2A) and XO-2N (also known as XO-2B), both of which has two known exoplanets.[6]

Star system

This system is located approximately 490 light-years away from Earth in the Lynx constellation. Both of these stars are slightly cooler than the Sun and are nearly identical to each other. The system has a magnitude of 11 and cannot be seen with the naked eye but is visible through a small telescope. These stars are also notable for their large proper motions.[8][9]

XO-2N and XO-2S have a separation of approximately 4,600 AU.[3]

Planetary systems

There are two known exoplanets orbiting XO-2N. XO-2Nb (or rarely XO-2Bb), which is classified as a hot Jupiter, was discovered by the XO Telescope using the transit method orbiting XO-2N (XO-2B) in 2007[3] and XO-2Nc was discovered in 2015 using the radial velocity method.[10][11]

Two planets were reported to orbit around XO-2S in 2014 using radial velocity method. One of them is Jupiter-mass and another has a mass comparable to Saturn.[6]

Both stars also show RV-trends, which may indicate the presence of additional long-periodic jovians or brown dwarfs around each of them.

The XO-2S planetary system[6]
Companion
(in order from star) 		Mass Semimajor axis
(AU) 		Orbital period
(days) 		Eccentricity Inclination Radius
b ≥ 0.259 ± 0.014 MJ 0.1344 ±0.0025 18.157 ± 0.034 0.18 ± 0.035 — —
c ≥ 1.37 ± 0.053 MJ 0.4756 ±0.0087 120.8 ± 0.034 0.1528 ± 0.01 — —
The XO-2N planetary system[12][13]
Companion
(in order from star) 		Mass Semimajor axis
(AU) 		Orbital period
(days) 		Eccentricity Inclination Radius
b 0.62 ± 0.02 MJ 0.0369 ±0.002 2.61586178 ± 0.00000075 0.045 ± 0.024 88.7 ± 1.3° 0.973 ± 0.03 RJ
c 1.8 MJ — >6200 — — —

See also

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. doi:10.1086/132034. Bibcode: 1987PASP...99..695R.  Vizier query form
  2. ↑ 2.0 2.1 2.2 2.3 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940  Gaia DR3 record for this source at VizieR.
  3. ↑ 3.0 3.1 3.2 3.3 3.4 3.5 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. doi:10.1086/523087. Bibcode: 2007ApJ...671.2115B. 
  4. ↑ 4.0 4.1 4.2 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940  Gaia DR3 record for this source at VizieR.
  5. ↑ 5.0 5.1 Benavides, Rafael; Francisco Rica; Esteban Reina; Julio Castellanos; Ramón Naves; Luis Lahuerta; Salvador Lahuerta (2010). "New Wide Common Proper Motion Binaries". Journal of Double Star Observations 6 (1): 30. Bibcode: 2010JDSO....6...30B. 
  6. ↑ 6.0 6.1 6.2 6.3 6.4 6.5 6.6 6.7 Desidera, S. et al. (2014). "The GAPS programme with HARPS-N at TNG. IV. A planetary system around XO-2S". Astronomy and Astrophysics 567 (6). doi:10.1051/0004-6361/201424339. Bibcode: 2014A&A...567L...6D. 
  7. ↑ 7.0 7.1 7.2 Fernandez, Jose M. et al. (2009). "The Transit Light Curve Project. XII. Six Transits of the Exoplanet XO-2b". The Astronomical Journal 137 (6): 4911–4916. doi:10.1088/0004-6256/137/6/4911. Bibcode: 2009AJ....137.4911F. 
  8. ↑ 8.0 8.1 "TYC 3413-210-1". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=TYC+3413-210-1. 
  9. ↑ 9.0 9.1 "TYC 3413-5-1". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=TYC+3413-5-1. 
  10. ↑ Damasso, M. et al. (2015). "The GAPS programme with HARPS-N at TNG. V. A comprehensive analysis of the XO-2 stellar and planetary systems". Astronomy & Astrophysics 575. doi:10.1051/0004-6361/201425332. Bibcode: 2015A&A...575A.111D. 
  11. ↑ "XO-2c". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=XO-2c. 
  12. ↑ Narita, Norio et al. (2011). "XO-2b: a Prograde Planet with a Negligible Eccentricity and an Additional Radial Velocity Variation". Publications of the Astronomical Society of Japan 63 (6): L67–L71. doi:10.1093/pasj/63.6.l67. Bibcode: 2011PASJ...63L..67N. 
  13. ↑ Sing, D. K. et al. (2011). "Gran Telescopio Canarias OSIRIS transiting exoplanet atmospheric survey: detection of potassium in XO-2b from narrowband spectrophotometry". Astronomy and Astrophysics 527. doi:10.1051/0004-6361/201015579. Bibcode: 2011A&A...527A..73S. 

External links

Coordinates: Sky map 07h 48m 06.468s, +50° 13′ 32.96″



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