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词条 XO-2 (star)
释义

  1. Planetary systems

  2. See also

  3. References

  4. External links

{{Starbox begin
| name = XO-2
}}{{Starbox observe 2s
| epoch = 2000
| constell = Lynx[1]
| component1 = XO-2S
| ra1 = {{RA|07|48|07.4814}}[2]
| dec1 = {{DEC|+50|13|03.2578}}[2]
| appmag_v1 = {{val|11.12|0.03}}
| component2 = XO-2N
| ra2 = {{RA|07|48|06.4726}}[5]
| dec2 = {{DEC|+50|13|32.9211}}[5]
| appmag_v2 = {{val|11.18|0.03}}
}}{{Starbox character
| class = K0V + K0V
}}{{Starbox astrometry
| component1 = XO-2S
| radial_v =
| prop_mo_ra = {{val|−29.317|0.063}}[2]
| prop_mo_dec = {{val|−154.398|0.044}}[2]
| parallax = 6.5765
| p_error = 0.0411
| parallax_footnote = [2]
| absmag_v =
| component2 = XO-2N
| radial_v2 =
| prop_mo_ra2 = {{val|−29.731|0.083}}[5]
| prop_mo_dec2 = {{val|−154.272|0.050}}[5]
| parallax2 = 6.4539
| p_error2 = 0.0603
| parallax_footnote2 = [5]
| absmag_v2 =
}}{{Starbox detail
| component1 = XO-2S
| mass = 0.982 ± 0.034[15]
| radius = 1.02[15]
| gravity =
| luminosity =
| temperature = 5399 ± 55 [15]
| metal_fe = 0.39 ± 0.05[15]
| rotation =
| age_gyr = 7.1 ± {{±|2.5|2.9}}[15]
| component2 = XO-2N
| class2 = K0V
| mass2 = 0.971 ± 0.034[20]
| radius2 = 0.976{{±|0.024|0.016}}[20]
| gravity2 =
| luminosity2 =
| temperature2 = 5340 ± 32
| metal_fe2 = 0.44 ± 0.02
| rotation2 =
| age_gyr2 = 6.3 ± 2.4[20]
}}{{Starbox catalog
| component1 = XO-2S
| names1 = {{odlist | 2MASS=J07480748+5013032 | GSC=03413-00210 | LSPM=J0748+5013S | TYC=3413-210-1 }}[25]
| component2 = XO-2N
| names2 = {{odlist | 2MASS=J07480647+5013328 | GSC=03413-00005 | LSPM=J0748+5013N | TYC=3413-5-1 }}[26]
}}{{Starbox reference
| Simbad = XO-2S | sn=XO-2S
| Simbad2 = XO-2N | sn2=XO-2N
}}{{Starbox end}}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).[15]

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.[25][26]

XO-2N and XO-2S have a separation of approximately {{formatnum:4600}} 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.[15]

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
| table_ref = [15]
}}{{OrbitboxPlanet
| exoplanet = b
| mass = ≥ 0.259 ± 0.014
| period = 18.157 ± 0.034
| semimajor = 0.1344 ±0.0025
| eccentricity = 0.18 ± 0.035
}}{{OrbitboxPlanet
| exoplanet = c
| mass = ≥ 1.37 ± 0.053
| period = 120.8 ± 0.034
| semimajor = 0.4756 ±0.0087
| eccentricity =0.1528 ± 0.01
}}{{Orbitbox end}}{{OrbitboxPlanet begin |name=XO-2N
| table_ref = [34][35]
}}{{OrbitboxPlanet
| exoplanet = b
| mass = 0.62 ± 0.02
| radius = 0.973 ± 0.03
| period = 2.61586178 ± 0.00000075
| semimajor = 0.0369 ±0.002
| eccentricity = 0.045 ± 0.024
| inclination = 88.7 ± 1.3
}}{{Orbitbox end}}

See also

  • HD 20781 and HD 20782
  • XO Telescope
  • List of extrasolar planets

References

1. ^1 2 3 4 5 6 7 8 {{cite journal | title=The GAPS programme with HARPS-N at TNG. IV. A planetary system around XO-2S | url=https://www.aanda.org/articles/aa/full_html/2014/07/aa24339-14/aa24339-14.html | last1=Desidera | first1=S. | last2=Bonomo | first2=A. S. | last3=Claudi | first3=R. U. | last4=Damasso | first4=M. | last5=Biazzo | first5=K. | last6=Sozzetti | first6=A. | last7=Marzari | first7=F. | last8=Benatti | first8=S. | last9=Gandolfi | first9=D. | last10=Gratton | first10=R. | last11=Lanza | first11=A. F. | last12=Nascimbeni | first12=V. | last13=Andreuzzi | first13=G. | last14=Affer | first14=L. | last15=Barbieri | first15=M. | last16=Bedin | first16=L. R. | last17=Bignamini | first17=A. | last18=Bonavita | first18=M. | last19=Borsa | first19=F. | last20=Calcidese | first20=P. | last21=Christille | first21=J. M. | last22=Cosentino | first22=R. | last23=Covino | first23=E. | last24=Esposito | first24=M. | last25=Giacobbe | first25=P. | last26=Harutyunyan | first26=A. | last27=Latham | first27=D. | last28=Lattanzi | first28=M. | last29=Leto | first29=G. | last30=Lodato | first30=G. | display-authors=1 | journal=Astronomy and Astrophysics | volume=567 | issue=6 | at=L6 | year=2014 | arxiv=1407.0251 | bibcode=2014A&A...567L...6D | doi=10.1051/0004-6361/201424339 }}
2. ^1 2 3 {{cite journal | title=The Transit Light Curve Project. XII. Six Transits of the Exoplanet XO-2b | last1=Fernandez | first1=Jose M. | last2=Holman | first2=Matthew J. | last3=Winn | first3=Joshua N. | last4=Torres | first4=Guillermo | last5=Shporer | first5=Avi | last6=Mazeh | first6=Tsevi | last7=Esquerdo | first7=Gilbert A. | last8=Everett | first8=Mark E. | display-authors=1 | journal=The Astronomical Journal | volume=137 | issue=6 | pages=4911–4916 | year=2009 | arxiv=0903.2687 | bibcode=2009AJ....137.4911F | doi=10.1088/0004-6256/137/6/4911 }}
3. ^1 2 3 4 5 {{cite DR2|934346740559239296}}
4. ^1 2 3 4 5 {{cite DR2|934346809278715776}}
5. ^1 {{cite journal | title=XO-2b: a Prograde Planet with a Negligible Eccentricity and an Additional Radial Velocity Variation | url=https://academic.oup.com/pasj/article/63/6/L67/1455472 | last1=Narita | first1=Norio | last2=Hirano | first2=Teruyuki | last3=Sato | first3=Bun’ei | last4=Harakawa | first4=Hiroki | last5=Fukui | first5=Akihiko | last6=Aoki | first6=Wako | last7=Tamura | first7=Motohide | display-authors=1 | journal=Publications of the Astronomical Society of Japan | volume=63 | issue=6 | pages=L67–L71 | year=2011 | arxiv=1110.6136 | bibcode=2011PASJ...63L..67N | doi=10.1093/pasj/63.6.l67}}
6. ^1 {{cite journal | title=Identification of a Constellation From a Position | last1=Roman | first1=Nancy G. | journal=Publications of the Astronomical Society of the Pacific | volume=99 | issue=617 | pages=695–699 | year=1987 | bibcode=1987PASP...99..695R | doi=10.1086/132034 }} Vizier query form
7. ^1 2 {{cite simbad | title=TYC 3413-210-1 |accessdate=2018-01-28}}
8. ^1 2 {{cite simbad | title=TYC 3413-5-1 |accessdate=2018-01-28}}
9. ^1 {{cite journal | title=Gran Telescopio Canarias OSIRIS transiting exoplanet atmospheric survey: detection of potassium in XO-2b from narrowband spectrophotometry | url=https://www.aanda.org/articles/aa/full_html/2011/03/aa15579-10/aa15579-10.html | last1=Sing | first1=D. K. | last2=Désert | first2=J.-M. | last3=Fortney | first3=J. J. | last4=Lecavelier Des Etangs | first4=A. | last5=Ballester | first5=G. E. | last6=Cepa | first6=J. | last7=Ehrenreich | first7=D. | last8=López-Morales | first8=M. | last9=Pont | first9=F. | last10=Shabram | first10=M. | last11=Vidal-Madjar | first11=A. | display-authors=1 | journal=Astronomy and Astrophysics | volume=527 | at=A73 | year=2011 | arxiv=1008.4795 | bibcode=2011A&A...527A..73S | doi=10.1051/0004-6361/201015579 }}
[1][2][3][4][5][6][7][8][9]
}}

External links

  • NASA PlanetQuest: [https://web.archive.org/web/20090419230513/http://planetquest.jpl.nasa.gov/news/Gl436.cfm Planet race heats up: 1 month, 32 discoveries]
  • {{cite web

| url=http://media4.obspm.fr/exoplanets/base/etoile.php?nom=XO-2
| title=XO-2
| work=Exoplanets
| accessdate=2009-04-28}}{{Sky|07|48|06.468|+|50|13|32.96|486}}{{Stars of Lynx}}

6 : K-type main-sequence stars|Lynx (constellation)|Planetary transit variables|Planetary systems|Multi-star planetary systems|Binary stars
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