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Revision as of 17:46, 28 January 2018
| Observation data Epoch 2000 Equinox 2000 | |
|---|---|
| Constellation | Lynx |
| XO-2S | |
| Right ascension | 07 48 06.468 |
| Declination | +50° 13′ 32.96″ |
| Apparent magnitude (V) | 11.12±0.03 |
| XO-2N | |
| Right ascension | 07 48 06.468 |
| Declination | +50° 13′ 32.96″ |
| Apparent magnitude (V) | 11.18±0.03 |
| Characteristics | |
| Spectral type | K0V + K0V |
| Astrometry | |
| Proper motion (μ) | RA: -34.7 ± 2.6 mas/yr Dec.: -153.6 ± 2.4 mas/yr |
| Distance | 483 ± 33 ly (148 ± 10 pc) |
| Details | |
| XO-2 S | |
| Mass | 0.982 ± 0.034 M☉ |
| Radius | 1.02 R☉ |
| Temperature | 5399 ± 55 K |
| Metallicity | 0.39 ± 0.05 dex |
| Age | 7.1 ± −2.9 Gyr |
| XO-2 N | |
| Mass | 0.971 ± 0.034 M☉ |
| Radius | 0.976 −0.016 R☉ |
| Temperature | 5340 ± 32 K |
| Metallicity | 0.44 ± 0.02 dex |
| Age | 6.3 ± 2.4 Gyr |
| Other designations | |
| TYC 3413-5-1, GSC 03413-00005, 2MASS J07480647+5013328 | |
| Database references | |
| SIMBAD | XO-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).
This system is located approximately 480 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.
XO-2N and XO-2S have a separation of approximately 4,600 AU.
Planetary systems
One known exoplanet, 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.
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.
Both stars also show RV-trends, which may indicate the presence of additional long-periodic jovians or brown dwarfs around each of them.
| 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 | — | — |
| 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 |
See also
References
- 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
- ^ 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.
- ^ Høg, E.; et al. (2000). "The Tycho-2 catalogue of the 2.5 million brightest stars". Astronomy and Astrophysics. 355: L27 – L30. Bibcode:2000A&A...355L..27H. doi:10.1888/0333750888/2862. Vizier catalog entry
- ^ 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.
- ^ 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). L6. arXiv:1407.0251. Bibcode:2014A&A...567L...6D. doi:10.1051/0004-6361/201424339.
- ^ 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. arXiv:0903.2687. Bibcode:2009AJ....137.4911F. doi:10.1088/0004-6256/137/6/4911.
- ^ "TYC 3413-5-1 -- High proper-motion Star". Centre de Données astronomiques de Strasbourg. Retrieved 2012-01-15.
- 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. arXiv:1110.6136. Bibcode:2011PASJ...63L..67N. doi:10.1093/pasj/63.6.l67.
- 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. A73. arXiv:1008.4795. Bibcode:2011A&A...527A..73S. doi:10.1051/0004-6361/201015579.
External links
- NASA PlanetQuest: Planet race heats up: 1 month, 32 discoveries
- "XO-2". Exoplanets. Retrieved 2009-04-28.
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