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Coordinates: Sky map 07h 48m 06.468s, +50° 13′ 32.96″
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General fixes & manual cleanup, typo(s) fixed: February 23, 2020 → February 23, 2020,, turkish → Turkish, approximatley → approximately, Univeristy → University
Tags: AWB Reverted
Undid edit by User:Mammoth500 which introduced factual errors (most importantly, the mentioned Delta Scuti variable is not XO-2 itself, according to the cited journal source). Also, how could a star be discovered later than its planets?
Tags: Undo references removed
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'''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''').<ref name="Desidera2014" />
'''XO-2''' is a Delta scuti type [[binary star]]. It consists of two components: '''XO-2S''' (Also known as '''XO-2A''') and '''XO-2N''' (Also known as '''XO-2B''').<ref name="Desidera2014" /> This system is located approximately 500 [[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 [[Apparent magnitude|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 motion]]s.<ref name="Simbad XO-2S" /><ref name="Simbad XO-2N" /> XO-2N and XO-2S have a separation of approximately {{formatnum:4600}} [[Astronomical unit|AU]].<ref name="Burke2007" /> XO-2 star was discovered by a team of Turkish [[astronomer]]s lead by Mustafa Turan Saglam on February 23, 2020, using the 0.4 meter [[Schmidt–Cassegrain telescope|Schmidit-Cassegrain telescope]] of the [[Istanbul University Observatory]] in [[Turkey]].<ref>{{Cite web |last=Nowakowski |first=Tomasz |last2=Phys.org |title=Turkish astronomers discover new short-period pulsating variable star |url=https://phys.org/news/2022-07-turkish-astronomers-short-period-pulsating-variable.html |access-date=2022-07-07 |website=phys.org |language=en}}</ref>


This system is located approximately 500 [[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 [[Apparent magnitude|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 motion]]s.<ref name="Simbad XO-2S"/><ref name="Simbad XO-2N"/>
The star [[Pulsar|pulsation]] period was mesuered to be P~0.95 hours with the star's mass being around 1.5 to 1.7 [[solar mass]]es. XO-2 effective temperature lies about 7,725 degrees [[kelvin]] ([[Kelvin|K]]) and a solar luminosities of 9.93. The absolute magnitude in V-band of approximately 2.76.<ref>{{Cite journal |last=Sağlam |first=Mustafa Turan |last2=Çördük |first2=Meryem |last3=Aliş |first3=Sinan |last4=Özgül |first4=Görkem |last5=Özgüllü |first5=Olcaytuğ |last6=Göktürk |first6=Fatih Erkam |last7=Gündüz |first7=Rahmi |last8=Fişek |first8=Süleyman |last9=Yelkenci |first9=F. Korhan |last10=Ülgen |first10=Eyüp Kaan |last11=Güver |first11=Tolga |date=2022-06-21 |title=Discovery of a Short Period Pulsator from Istanbul University Observatory |url=http://arxiv.org/abs/2206.14632 |journal=Turkish Journal of Astronomy and Astrophysics |doi=10.55064/tjaa.1103590 |issn=2757-7295}}</ref>

XO-2N and XO-2S have a separation of approximately {{formatnum:4600}} [[Astronomical unit|AU]].<ref name="Burke2007" />


==Planetary systems==
==Planetary systems==
There are two known [[exoplanets]] orbiting XO-2N [[star]]. [[XO-2Nb]] (TYC 3413-210-1b and rarely XO-2Bb), which is classified as a [[hot Jupiter]], was discovered by the [[XO Telescope]] using the [[Methods of detecting extrasolar planets#Transit method|transit method]] orbiting XO-2N (XO-2B) in 2007<ref name="Burke2007" /> and XO-2Nc was discovered in 2015 using the [[Methods of detecting extrasolar planets#radial velocity method|radial velocity method]].<ref name ="Damasso et al"/><ref name="Simbad XO-2c"/> The planets right ascension is 07 48 07 .479 with its declination of +50 13 03 .25.<ref>{{Cite web |title=Open Exoplanet Catalogue - XO-2S b |url=http://www.openexoplanetcatalogue.com/planet/XO-2S%20b/ |access-date=2022-07-07 |website=www.openexoplanetcatalogue.com}}</ref>
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 [[Methods of detecting extrasolar planets#Transit method|transit method]] orbiting XO-2N (XO-2B) in 2007<ref name="Burke2007" /> and XO-2Nc was discovered in 2015 using the [[Methods of detecting extrasolar planets#radial velocity method|radial velocity method]].<ref name ="Damasso et al"/><ref name="Simbad XO-2c"/>
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.<ref name="Desidera2014" />


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.<ref name="Desidera2014" /> Both stars also show RV-trends, which may indicate the presence of additional long-periodic jovians or brown dwarfs around each of them.
Both stars also show RV-trends, which may indicate the presence of additional long-periodic jovians or brown dwarfs around each of them.


{{OrbitboxPlanet begin |name=XO-2S
{{OrbitboxPlanet begin |name=XO-2S
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== See also ==
==See also==
* [[HD 20781]] and [[HD 20782]]
* [[HD 20781]] and [[HD 20782]]
* [[XO Telescope]]
* [[XO Telescope]]
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{{Stars of Lynx}}
{{Stars of Lynx}}


{{DEFAULTSORT:XO-2 (star)}}
[[Category:K-type main-sequence stars]]
[[Category:K-type main-sequence stars]]
[[Category:Lynx (constellation)]]
[[Category:Lynx (constellation)]]

Revision as of 18:35, 9 July 2022

XO-2
Observation data
Epoch J2000      Equinox J2000
Constellation Lynx[1]
XO-2S
Right ascension 07h 48m 07.4814s[2]
Declination +50° 13′ 03.2578″[2]
Apparent magnitude (V) 11.12±0.03[3]
XO-2N
Right ascension 07h 48m 06.4726s[4]
Declination +50° 13′ 32.9211″[4]
Apparent magnitude (V) 11.18±0.03[3]
Characteristics
Spectral type K0V + K0V[3]
Astrometry
XO-2S
Proper motion (μ) RA: −29.317±0.063[2] mas/yr
Dec.: −154.398±0.044[2] mas/yr
Parallax (π)6.5765 ± 0.0411 mas[2]
Distance496 ± 3 ly
(152.1 ± 1.0 pc)
XO-2N
Proper motion (μ) RA: −29.731±0.083[4] mas/yr
Dec.: −154.272±0.050[4] mas/yr
Parallax (π)6.4539 ± 0.0603 mas[4]
Distance505 ± 5 ly
(155 ± 1 pc)
Details
XO-2S
Mass0.982 ± 0.034[5] M☉
Radius1.02[5] R☉
Temperature5399 ± 55 [5] K
Metallicity [Fe/H]0.39 ± 0.05[5] dex
Age7.1 ± +2.5
−2.9[5] Gyr
XO-2N
Mass0.971 ± 0.034[6] M☉
Radius0.976+0.024
−0.016[6] R☉
Temperature5340 ± 32[3] K
Metallicity [Fe/H]0.44 ± 0.02[3] dex
Age6.3 ± 2.4[6] Gyr
Other designations
XO-2S: LSPM J0748+5013S, TYC 3413-210-1, GSC 03413-00210, 2MASS J07480748+5013032[7]
XO-2N: LSPM J0748+5013N, TYC 3413-5-1, GSC 03413-00005, 2MASS J07480647+5013328[8]
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).[5]

This system is located approximately 500 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.[7][8]

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.[9][10]

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.[5]

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[5]
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[11][12]
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. Bibcode:1987PASP...99..695R. doi:10.1086/132034. Vizier query form
  2. ^ a b c d e 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. ^ 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 e 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.
  5. ^ 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.
  6. ^ 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.
  7. ^ a b "TYC 3413-210-1". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-01-28.
  8. ^ a b "TYC 3413-5-1". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-01-28.
  9. ^ Damasso, M.; et al. (2015). "A comprehensive analysis of the XO-2 stellar and planetary systems". Astronomy & Astrophysics. 575. A111. doi:10.1051/0004-6361/201425332.
  10. ^ "XO-2c". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2019-06-09.
  11. ^ 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.
  12. ^ 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.


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