Astronomy:Gliese 179

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Short description: Star in the constellation Orion
Gliese 179
Observation data
Equinox J2000.0]] (ICRS)
Constellation Orion
Right ascension  04h 52m 05.73212s[1]
Declination +06° 28′ 35.5887″[1]
Apparent magnitude (V) 11.94[2]
Characteristics
Spectral type M2V[3] or M3.5[4]
Apparent magnitude (U) 14.791[2]
Apparent magnitude (B) 13.530[2]
Apparent magnitude (R) 10.85[2]
Apparent magnitude (I) 9.334[2]
Apparent magnitude (J) 7.814±0.024[2]
Apparent magnitude (H) 7.209±0.046[2]
Apparent magnitude (K) 6.942±0.018[2]
U−B color index 1.26[2]
B−V color index 1.590±0.015[2]
V−R color index 1.09[2]
R−I color index 1.52[2]
Astrometry
Radial velocity (Rv)–9.05±0.15[2] km/s
Proper motion (μ) RA: 153.615[1] mas/yr
Dec.: −306.046[1] mas/yr
Parallax (π)80.5623 ± 0.0236[1] mas
Distance40.48 ± 0.01 ly
(12.413 ± 0.004 pc)
Absolute magnitude (MV)11.50[2]
Details
Mass0.400±0.005 M☉[4]
0.357±0.03[5] M☉
Radius0.400±0.005 R☉[4]
0.318±0.024 R☉[6]
0.38±0.02[5] R☉
Luminosity0.0158±0.0003 L☉[4]
0.016±0.02[5] L☉
Surface gravity (log g)4.148[7] cgs
Temperature3,424±16[8] K
Metallicity [Fe/H]+0.36±0.04 dex[9]
+0.30±0.10 dex[5]
+0.12[10] dex
Age4.6+3.5
−2.4[10] Gyr
Other designations
GJ 179, HIP 22627, G 83-37, 84-15, 82-52, LTT 11525, NLTT 14088, Ross 401, Wolf 1539[11]
Database references
SIMBADdata
Exoplanet Archivedata
ARICNSdata
Extrasolar Planets
Encyclopaedia		data

Gliese 179 is a small red dwarf star with an exoplanetary companion in the equatorial constellation of Orion. It is much too faint to be visible to the naked eye with an apparent visual magnitude of 11.94.[2] The system is located at a distance of 40.5 light-years (12.4 parsecs) from the Sun based on parallax measurements, but is drifting closer with a radial velocity of –9 km/s.[2] It is a high proper motion star, traversing the celestial sphere at an angular rate of 0.370″·yr−1.[12]

This is an M-type main-sequence star with a stellar classification of M2V.[3] Based on the motion of this star through space, it is estimated to be roughly 4.6 billion years old.[10] It is chromospherically active[5] with a projected rotational velocity of 4 km/s.[7] This star is smaller and less massive than the Sun, but has a higher metal content. It is radiating just 1.6% of the luminosity of the Sun from its photosphere at an effective temperature of 3,424.[8]

In 2009, a Jovian-type planet was found in orbit around the star,[5] one of the few red dwarfs known to harbor a planet of this mass.[10] The radial velocity data suggested there may be an additional companion. At the orbital distance of this planet, it is not expected to be influenced by tidal interactions with the host star.[10] In 2023, the inclination and true mass of Gliese 179 b were determined via astrometry.[13] A second candidate planet was reported in 2017[14] and was also reported in a 2019 preprint. This is a potential super-Earth with a minimum mass equal to about five times the mass of the Earth.[15]

The Gliese 179 planetary system[13][15]
Companion
(in order from star) 		Mass Semimajor axis
(AU) 		Orbital period
(days) 		Eccentricity Inclination Radius
c (unconfirmed) ≥4.9±2.7 M⊕ 0.032±0.003 3.4798+0.0014
−0.0010 		0.04+0.27
−0.04 		— —
b 0.95+0.16
−0.11 MJ 		2.424+0.071
−0.075 		2303+34
−31 		0.179+0.048
−0.044 		61+16
−13 or 119+13
−16° 		—

See also


References

  1. ↑ 1.0 1.1 1.2 1.3 Vallenari, A. et al. (2022). "Gaia Data Release 3. Summary of the content and survey properties". Astronomy & Astrophysics. doi:10.1051/0004-6361/202243940  Gaia DR3 record for this source at VizieR.
  2. ↑ 2.00 2.01 2.02 2.03 2.04 2.05 2.06 2.07 2.08 2.09 2.10 2.11 2.12 2.13 2.14 2.15 Anderson, E.; Francis, Ch. (2012). "XHIP: An extended hipparcos compilation". Astronomy Letters 38 (5): 331. doi:10.1134/S1063773712050015. Bibcode: 2012AstL...38..331A. 
  3. ↑ 3.0 3.1 Stephenson, C. B. (July 1986). "Dwarf K and M stars of high proper motion found in a hemispheric survey". The Astronomical Journal 92: 139–165. doi:10.1086/114146. Bibcode: 1986AJ.....92..139S. 
  4. ↑ 4.0 4.1 4.2 4.3 Schweitzer, A. et al. (May 2019). "The CARMENES search for exoplanets around M dwarfs. Different roads to radii and masses of the target stars". Astronomy & Astrophysics 625: 16. doi:10.1051/0004-6361/201834965. A68. Bibcode: 2019A&A...625A..68S. 
  5. ↑ 5.0 5.1 5.2 5.3 5.4 5.5 Howard, Andrew W. et al. (2010). "The California Planet Survey. I. Four New Giant Exoplanets". The Astrophysical Journal 721 (2): 1467–1481. doi:10.1088/0004-637X/721/2/1467. Bibcode: 2010ApJ...721.1467H. 
  6. ↑ Houdebine, Éric R. et al. (2019). "The Mass-Activity Relationships in M and K Dwarfs. I. Stellar Parameters of Our Sample of M and K Dwarfs". The Astronomical Journal 158 (2): 56. doi:10.3847/1538-3881/ab23fe. Bibcode: 2019AJ....158...56H. 
  7. ↑ 7.0 7.1 Hojjatpanah, S. et al. (2019). "Catalog for the ESPRESSO blind radial velocity exoplanet survey". Astronomy & Astrophysics 629: A80. doi:10.1051/0004-6361/201834729. Bibcode: 2019A&A...629A..80H. 
  8. ↑ 8.0 8.1 Rojas-Ayala, Bárbara et al. (April 2012). "Metallicity and Temperature Indicators in M Dwarf K-band Spectra: Testing New and Updated Calibrations with Observations of 133 Solar Neighborhood M Dwarfs". The Astrophysical Journal 748 (2): 93. doi:10.1088/0004-637X/748/2/93. Bibcode: 2012ApJ...748...93R. http://authors.library.caltech.edu/31363/1/RojasAyala2012p18033Astrophys_J.pdf. 
  9. ↑ Lindgren, Sara; Heiter, Ulrike (2017). "Metallicity determination of M dwarfs. Expanded parameter range in metallicity and effective temperature". Astronomy and Astrophysics 604: A97. doi:10.1051/0004-6361/201730715. Bibcode: 2017A&A...604A..97L. https://www.aanda.org/articles/aa/full_html/2017/08/aa30715-17/aa30715-17.html. 
  10. ↑ 10.0 10.1 10.2 10.3 10.4 Veyette, Mark J.; Muirhead, Philip S. (August 2018). "Chemo-kinematic Ages of Eccentric-planet-hosting M Dwarf Stars". The Astrophysical Journal 863 (2): 16. doi:10.3847/1538-4357/aad40e. 166. Bibcode: 2018ApJ...863..166V. 
  11. ↑ "Wolf 1539". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=Wolf+1539. 
  12. ↑ Lépine, Sébastien; Shara, Michael M. (March 2005). "A Catalog of Northern Stars with Annual Proper Motions Larger than 0.15" (LSPM-NORTH Catalog)". The Astronomical Journal 129 (3): 1483–1522. doi:10.1086/427854. Bibcode: 2005AJ....129.1483L. 
  13. ↑ 13.0 13.1 Xiao, Guang-Yao et al. (March 2023). "The Masses of a Sample of Radial-Velocity Exoplanets with Astrometric Measurements". Research in Astronomy and Astrophysics 23 (5). doi:10.1088/1674-4527/accb7e. Bibcode: 2023RAA....23e5022X. 
  14. ↑ Butler, R. Paul (13 April 2017). "The LCES HIRES/Keck Precision Radial Velocity Exoplanet Survey". The Astronomical Journal 153 (5): 208. doi:10.3847/1538-3881/aa66ca. Bibcode: 2017AJ....153..208B. 
  15. ↑ 15.0 15.1 Tuomi, M.; Jones, H. R. A.; Anglada-Escudé, G.; Butler, R. P.; Arriagada, P.; Vogt, S. S.; et al. (2019). "Frequency of planets orbiting M dwarfs in the Solar neighbourhood". arXiv:1906.04644 [astro-ph.EP].

Coordinates: Sky map 04h 52m 05.7273s, +06° 28′ 35.542″



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