XO-5

Last updated
XO-5 / Absolutno
Observation data
Epoch J2000       Equinox J2000
Constellation Lynx [1]
Right ascension 07h 46m 51.9615s [2]
Declination +39° 05′ 40.461″ [2]
Apparent magnitude  (V)12.13 ± 0.03 [3]
Characteristics
Spectral type G8V [3] + M [4]
Apparent magnitude  (V)12.13 ± 0.03 [3]
Apparent magnitude  (R)11.844 [5]
Apparent magnitude  (J)10.774 ± 0.019 [6]
Apparent magnitude  (H)10.443 ± 0.021 [6]
Apparent magnitude  (K)10.345 ± 0.018 [6]
Astrometry
Radial velocity (Rv)−9.47±0.65 [2] km/s
Proper motion (μ)RA: −21.509(18) mas/yr [2]
Dec.: −23.910(13) mas/yr [2]
Parallax (π)3.6517±0.0173  mas [2]
Distance 893 ± 4  ly
(274 ± 1  pc)
Absolute magnitude  (MV)5.06 ± 0.12 [7]
Details
Mass 1.04±0.03 [8]   M☉
Radius 1.13±0.03 [8]   R☉
Luminosity 0.88±0.09 [7]   L☉
Surface gravity (log g)4.35±0.02 [8]   cgs
Temperature 5430±70 [8]   K
Metallicity [Fe/H]+0.05±0.06 [7]   dex
Rotational velocity (v sin i)0.7±0.5 [7]  km/s
Age 7.0±7.0 [9]   Gyr
Other designations
Absolutno, TOI-5373, TIC 9155187, GSC 02959-00729, 2MASS J07465196+3905404, UCAC2 45499774 [10]
Database references
SIMBAD data
Exoplanet Archive data

XO-5 is a likely binary star system, 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]

Contents

XO-5 has a suspected red dwarf companion with a temperature of 3500+250
−150 K, on a wide orbit. [4] A 2024 study also identified it as a very likely binary star, with 94% probability. [11]

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). [12] [13]

Planetary system

Size comparison of XO-5 b and Jupiter Exoplanet Comparison XO-5 b.png
Size comparison of XO-5 b and Jupiter

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. [14]

The XO-5 planetary system [8] [note 1]
Companion
(in order from star)		 Mass Semimajor axis
(AU)		 Orbital period
(days)		 Eccentricity Inclination Radius
b / Makropulos 1.19±0.03  MJ 0.0515±0.00054.1877558(6)086.8±0.2 ° 1.14±0.03  RJ

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. 1 2 3 4 5 6 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. 1 2 3 4 5 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. 1 2 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. 1 2 3 Cutri; et al. (2003). "2MASS===07465196+3905404". 2MASS All-Sky Catalog of Point Sources. Retrieved 2012-02-20.
  7. 1 2 3 4 5 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. 1 2 3 4 5 Smith, A. M. S. (March 2015). "The Properties of XO-5b and WASP-82b Redetermined Using New High-Precision Transit Photometry and Global Data Analyses". Acta Astronomica . 65: 117. arXiv: 1412.0451 . Bibcode:2015AcA....65..117S. doi:10.48550/arXiv.1412.0451.
  9. ↑ Bonomo, A. S.; Desidera, S.; et al. (June 2017). "The GAPS Programme with HARPS-N at TNG. XIV. Investigating giant planet migration history via improved eccentricity and mass determination for 231 transiting planets". Astronomy & Astrophysics . 602: A107. arXiv: 1704.00373 . Bibcode:2017A&A...602A.107B. doi:10.1051/0004-6361/201629882.
  10. ↑ "GSC 02959-00729". SIMBAD . Centre de données astronomiques de Strasbourg . Retrieved 2009-04-26.
  11. ↑ 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
  12. ↑ "Approved names". NameExoworlds. Retrieved 2020-01-02.
  13. ↑ "International Astronomical Union | IAU". www.iau.org. Retrieved 2020-01-02.
  14. ↑ 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.
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