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XO-2 (star)

October 20, 2023

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]

XO-2
Observation data
Epoch J2000      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) mas/yr[2]
Dec.: −154.233(13) mas/yr[2]
Parallax (π)6.6721 ± 0.0151 mas[2]
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[4]
Dec.: −154.227(11) mas/yr[4]
Parallax (π)6.6588 ± 0.0158 mas[4]
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
Metallicity [Fe/H]0.44 ± 0.02[3] dex
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

Star system Edit

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 Edit

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 Edit

References Edit

  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. ^ a b c d 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.
  3. ^ a b c d e f g 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.
  4. ^ a b c d 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.
  5. ^ a b 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. ^ a b c d e f g h 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. S2CID 118567085.
  7. ^ a b c 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. S2CID 7113991.
  8. ^ a b "TYC 3413-210-1". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-01-28.
  9. ^ a b "TYC 3413-5-1". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-01-28.
  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 A111. Bibcode:2015A&A...575A.111D. doi:10.1051/0004-6361/201425332.
  11. ^ "XO-2c". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-06-09.
  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. arXiv:1110.6136. Bibcode:2011PASJ...63L..67N. doi:10.1093/pasj/63.6.l67. S2CID 119269227.
  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 A73. arXiv:1008.4795. Bibcode:2011A&A...527A..73S. doi:10.1051/0004-6361/201015579. S2CID 56545385.

External links Edit

  • NASA PlanetQuest:
  • . Exoplanets. Archived from the original on 2016-03-03. Retrieved 2009-04-28.


October 20, 2023
star, binary, star, consists, components, also, known, also, known, both, which, known, exoplanets, observation, dataepoch, j2000, equinox, j2000constellation, lynx, 2sright, ascension, 4814s, declination, 2554, apparent, magnitude, 2nright, ascension, 4723s, . 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 XO 2 Observation dataEpoch J2000 Equinox J2000Constellation Lynx 1 XO 2SRight ascension 07h 48m 07 4814s 2 Declination 50 13 03 2554 2 Apparent magnitude V 11 12 0 03 3 XO 2NRight ascension 07h 48m 06 4723s 4 Declination 50 13 32 9206 4 Apparent magnitude V 11 18 0 03 3 CharacteristicsSpectral type K0V K0V 3 AstrometryXO 2SProper motion m RA 29 308 15 mas yr 2 Dec 154 233 13 mas yr 2 Parallax p 6 6721 0 0151 mas 2 Distance489 1 ly 149 9 0 3 pc Absolute magnitude MV 5 74 5 XO 2NProper motion m RA 29 552 15 mas yr 4 Dec 154 227 11 mas yr 4 Parallax p 6 6588 0 0158 mas 4 Distance490 1 ly 150 2 0 4 pc Absolute magnitude MV 5 74 5 DetailsXO 2SMass0 982 0 034 6 M Radius1 02 6 R Temperature5399 55 6 KMetallicity Fe H 0 39 0 05 6 dexAge7 1 2 5 2 9 6 GyrXO 2NMass0 971 0 034 7 M Radius0 976 0 024 0 016 7 R Temperature5340 32 3 KMetallicity Fe H 0 44 0 02 3 dexAge6 3 2 4 7 GyrOther designationsXO 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 referencesSIMBADXO 2SXO 2N Contents 1 Star system 2 Planetary systems 3 See also 4 References 5 External linksStar system EditThis 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 EditThere 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 Radiusb 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 Radiusb 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 RJc 1 8 MJ gt 6200 See also EditHD 20781 and HD 20782 List of extrasolar planetsReferences Edit 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 a b c d 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 amp A 674A 1G doi 10 1051 0004 6361 202243940 S2CID 244398875 Gaia DR3 record for this source at VizieR a b c d e f g 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 a b c d 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 amp A 674A 1G doi 10 1051 0004 6361 202243940 S2CID 244398875 Gaia DR3 record for this source at VizieR a b Benavides Rafael Francisco Rica Esteban Reina Julio Castellanos Ramon Naves Luis Lahuerta Salvador Lahuerta 2010 New Wide Common Proper Motion Binaries Journal of Double Star Observations 6 1 30 Bibcode 2010JDSO 6 30B a b c d e f g h 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 amp A 567L 6D doi 10 1051 0004 6361 201424339 S2CID 118567085 a b c 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 S2CID 7113991 a b TYC 3413 210 1 SIMBAD Centre de donnees astronomiques de Strasbourg Retrieved 2018 01 28 a b TYC 3413 5 1 SIMBAD Centre de donnees astronomiques de Strasbourg Retrieved 2018 01 28 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 amp Astrophysics 575 A111 Bibcode 2015A amp A 575A 111D doi 10 1051 0004 6361 201425332 XO 2c SIMBAD Centre de donnees astronomiques de Strasbourg Retrieved 2019 06 09 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 S2CID 119269227 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 amp A 527A 73S doi 10 1051 0004 6361 201015579 S2CID 56545385 External links EditNASA PlanetQuest Planet race heats up 1 month 32 discoveries XO 2 Exoplanets Archived from the original on 2016 03 03 Retrieved 2009 04 28 Retrieved from https en wikipedia org w index php title XO 2 star amp oldid 1165294224, wikipedia, wiki, book, books, library,

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