XO-5 is a binary star, made up of a G-type dwarf and a red dwarf companion, located approximately 893 light-years away from Earth in the Lynx constellation. It has a magnitude of about 12 and cannot be seen with the naked eye but is visible through a small telescope.[3][7]

XO-5 has a suspected red dwarf companion with a temperature 3500+250
−150 K, on a wide orbit.[4] A 2024 study also identified it as a very likely binary star, with 94% probability.[9]

The star XO-5 is named Absolutno. The name was selected in the NameExoWorlds campaign by the Czech Republic, during the 100th anniversary of the IAU. Absolutno is a fictional miraculous substance in the sci-fi novel Továrna na absolutno (The Factory for the Absolute).[10][11]

Planetary system

The exoplanet XO-5b was discovered by the XO Telescope using the transit method in 2008. This planet is classified as a hot jupiter.[3] A search for transit timing variations caused by additional planets was negative.[12]

Size comparison of XO-5 b and Jupiter
The XO-5 planetary system[7][13]
Companion
(in order from star) 		Mass Semimajor axis
(AU) 		Orbital period
(days) 		Eccentricity Inclination Radius
b / Makropulos 1.059 ± 0.028 MJ 0.0488 ± 0.0006 4.1877545 ± 0.0000016 0[note 1] — —

See also

Notes

  1. ^ eccentricity is insignificant compared to its uncertainties[7]

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 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 Burke, Christopher J.; et al. (2008). "XO-5b: A Transiting Jupiter-sized Planet with a 4 day Period". The Astrophysical Journal. 686 (2): 1331–1340. arXiv:0805.2399. Bibcode:2008ApJ...686.1331B. doi:10.1086/591497. S2CID 14043772.
  4. ^ a b Piskorz, Danielle; Knutson, Heather A.; Ngo, Henry; Muirhead, Philip S.; Batygin, Konstantin; Crepp, Justin R.; Hinkley, Sasha; Morton, Timothy D. (2015), "Friends of Hot Jupiters. III. An Infrared Spectroscopic Search for Low-Mass Stellar Companions", The Astrophysical Journal, 814 (2): 148, arXiv:1510.08062, Bibcode:2015ApJ...814..148P, doi:10.1088/0004-637X/814/2/148, S2CID 11525988
  5. ^ Zacharias; et al. (2009). "3UC===259-099032". Third U.S. Naval Observatory CCD Astrograph Catalog. Retrieved 2012-02-21.
  6. ^ a b c Cutri; et al. (2003). "2MASS===07465196+3905404". 2MASS All-Sky Catalog of Point Sources. Retrieved 2012-02-20.
  7. ^ a b c d e f g h i j k Pál, A.; et al. (2009). "Independent Confirmation and Refined Parameters of the Hot Jupiter XO-5b". The Astrophysical Journal. 700 (1): 783–790. arXiv:0810.0260. Bibcode:2009ApJ...700..783P. doi:10.1088/0004-637X/700/1/783. S2CID 18318327.
  8. ^ "GSC 02959-00729". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2009-04-26.
  9. ^ Jing, Yingjie; Mao, Tian-Xiang; Wang, Jie; Liu, Chao; Chen, Xiaodian (2024-11-06). "Half a Million Binary Stars identified from the low resolution spectra of LAMOST". arXiv:2411.03994. Note: See external tables
  10. ^ "Approved names". NameExoworlds. Retrieved 2020-01-02.
  11. ^ "International Astronomical Union | IAU". www.iau.org. Retrieved 2020-01-02.
  12. ^ Maciejewski, G.; et al. (2011). "Refining Parameters of the XO-5 Planetary System with High-Precision Transit Photometry" (PDF). Acta Astronomica. 61 (1): 25–35. arXiv:1103.1325. Bibcode:2011AcA....61...25M.
  13. ^ Sada, Pedro V.; et al. (2012). "Extrasolar Planet Transits Observed at Kitt Peak National Observatory". Publications of the Astronomical Society of the Pacific. 124 (913): 212–229. arXiv:1202.2799. Bibcode:2012PASP..124..212S. doi:10.1086/665043. S2CID 29665395.


Allikas: https://en.wikipedia.org/wiki/XO-5
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