Astronomy:Gliese 163

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Short description: Red dwarf star in the constellation Dorado
Gliese 163
Observation data
Equinox J2000.0]] (ICRS)
Constellation Dorado
Right ascension  04h 09m 15.66834s[1]
Declination −53° 22′ 25.2900″[1]
Apparent magnitude (V) 11.79[2]
Characteristics
Spectral type M3.5V[3]
B−V color index 1.480±0.008[2]
Astrometry
Radial velocity (Rv)58.30±0.24[1] km/s
Proper motion (μ) RA: 1046.236±0.019[1] mas/yr
Dec.: 584.166±0.023[1] mas/yr
Parallax (π)66.0705 ± 0.0172[1] mas
Distance49.36 ± 0.01 ly
(15.135 ± 0.004 pc)
Absolute magnitude (MV)10.91[2]
Details
Mass0.405±0.010[4] M
Radius0.409+0.017
−0.016
[4] R
Luminosity0.02163±0.00063[4] L
Surface gravity (log g)4.87[5] cgs
Temperature3,460+76
−74
[4] K
Metallicity [Fe/H]0.1±0.1[6] dex
Rotation61.0±0.3 d[7]
Rotational velocity (v sin i)0.85[8] km/s
Age5[9] Gyr
Other designations
GJ 163, HIP 19394, LHS 188, LTT 1881[10]
Database references
SIMBADdata

Gliese 163 is a faint red dwarf star with multiple exoplanetary companions in the southern constellation of Dorado. Other stellar catalog names for it include HIP 19394 and LHS 188.[10] It is too faint to be visible to the naked eye, having an apparent visual magnitude of 11.79[2] and an absolute magnitude of 10.91.[2] This system is located at a distance of 49.4 light-years from the Sun based on parallax measurements.[1] Judging by its space velocity components, it is most likely a thick disk star.[3]

This is a small M-type main-sequence star with a stellar classification of M3.5V.[3] It has a relatively low activity level for a red dwarf of its mass, suggesting it is an old star with an age of at least two billion years.[6] This star has 41% of the mass and radius of the Sun.[4] It is spinning slowly with a projected rotational velocity of 0.85 km/s[8] and has a rotation period of 61 days.[7] The star is radiating just 2%[6] of the luminosity of the Sun from its photosphere at an effective temperature of 3,460 K.[4]

Planetary system

In September 2012, astronomers using the HARPS instrument announced the discovery of two planets orbiting Gliese 163.[11][12] The first planet, Gliese 163 b, is a super-Earth or mini-Neptune with an orbital period of 9 days, therefore far too hot to be considered habitable. However, Gliese 163 c, with an orbital period of 26 days and a minimum mass of 6.9 Earth masses, was considered to potentially be in the star's habitable zone, although it is hotter than Earth, with a temperature of 60 deg. C (140 deg. F). It has an eccentricity estimated to be about 0.03, giving it a fairly circular orbit. Evidence was also found for a third planet orbiting further out than c and b.[11][12]

In June 2013, it was concluded that at least 3 planets orbit around the star with a fourth planet being a possibility,[6] and in a paper submitted to arXiv in June 2019, that and another planet were found, thus giving the system a total of five planets.[13]

The Gliese 163 planetary system[14][13]
Companion
(in order from star)
Mass Semimajor axis
(AU)
Orbital period
(days)
Eccentricity Inclination Radius
b 9.9±2.3 M 0.060+0.005
−0.006
8.6312+0.0023
−0.0021
0.02+0.12
−0.02
c 7.6+2.9
−2.3
 M
0.124+0.010
−0.013
25.637±0.042 0.03+0.18
−0.03
f 6.8±4.4 M 0.326+0.027
−0.034
109.5+1.6
−1.4
0.04+0.23
−0.04
e 13.6+8.2
−6.5
 M
0.700±0.066 349+12
−10
0.03+0.25
−0.03
d 20.2±7.6 M 1.021+0.088
−0.118
604+29
−24
0.02+0.22
−0.02

References

  1. 1.0 1.1 1.2 1.3 1.4 1.5 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. 2.0 2.1 2.2 2.3 2.4 Anderson, E.; Francis, Ch. (2012), "XHIP: An extended hipparcos compilation", Astronomy Letters 38 (5): 331, doi:10.1134/S1063773712050015, Bibcode2012AstL...38..331A 
  3. 3.0 3.1 3.2 Reid, I. Neill et al. (October 1995). "The Palomar/MSU Nearby-Star Spectroscopic Survey. I. The Northern M Dwarfs -Bandstrengths and Kinematics". Astronomical Journal 110: 1838. doi:10.1086/117655. Bibcode1995AJ....110.1838R. 
  4. 4.0 4.1 4.2 4.3 4.4 4.5 Pineda, J. Sebastian et al. (September 2021). "The M-dwarf Ultraviolet Spectroscopic Sample. I. Determining Stellar Parameters for Field Stars". The Astrophysical Journal 918 (1): 23. doi:10.3847/1538-4357/ac0aea. 40. Bibcode2021ApJ...918...40P. 
  5. Santos, N. C. et al. (August 2013). "SWEET-Cat: A catalogue of parameters for Stars With ExoplanETs. I. New atmospheric parameters and masses for 48 stars with planets". Astronomy & Astrophysics 556: 11. doi:10.1051/0004-6361/201321286. A150. Bibcode2013A&A...556A.150S. 
  6. 6.0 6.1 6.2 6.3 Tuomi, M.; Anglada-Escudé, G. (2013). "Up to four planets around the M dwarf GJ 163". Astronomy & Astrophysics 556: A111. doi:10.1051/0004-6361/201321174. 
  7. 7.0 7.1 Suárez Mascareño, A. et al. (September 2015), "Rotation periods of late-type dwarf stars from time series high-resolution spectroscopy of chromospheric indicators", Monthly Notices of the Royal Astronomical Society 452 (3): 2745–2756, doi:10.1093/mnras/stv1441, Bibcode2015MNRAS.452.2745S 
  8. 8.0 8.1 Houdebine, E. R.; Mullan, D. J.; Paletou, F.; Gebran, M.; Bubar, E. J.; McGahee, C. E.; O'Donoghue, A. A.; Knox, E. R. (2016). "Rotation-Activity Correlations in K and M Dwarfs. I. Stellar Parameters and Compilations of v sin I and P/Sin I for a Large Sample of Late-K and M Dwarfs". The Astrophysical Journal 822 (2): 97. doi:10.3847/0004-637X/822/2/97. Bibcode2016ApJ...822...97H. 
  9. Linsky, Jeffrey L. et al. (October 2020). "The Relative Emission from Chromospheres and Coronae: Dependence on Spectral Type and Age". The Astrophysical Journal 902 (1): 15. doi:10.3847/1538-4357/abb36f. 3. Bibcode2020ApJ...902....3L. 
  10. 10.0 10.1 "L 229-91". SIMBAD. Centre de données astronomiques de Strasbourg. http://simbad.u-strasbg.fr/simbad/sim-basic?Ident=L+229-91. 
  11. 11.0 11.1 Méndez, Abel (August 29, 2012). "A Hot Potential Habitable Exoplanet around Gliese 163". University of Puerto Rico at Arecibo (Planetary Habitability Laboratory). http://phl.upr.edu/press-releases/ahotpotentialhabitableexoplanetaroundgliese163. Retrieved September 20, 2012. 
  12. 12.0 12.1 Redd, Nola Taylor (September 20, 2012). "Newfound Alien Planet a Top Contender to Host Life". Space.com. http://www.space.com/17684-alien-planet-gliese-163c-extraterrestrial-life.html. Retrieved September 20, 2012. 
  13. 13.0 13.1 Tuomi, M. et al. (June 2019) (in en). Frequency of planets orbiting M dwarfs in the Solar neighbourhood. Bibcode2019arXiv190604644T. 
  14. Bonfils, Xavier et al. (5 August 2013). "The HARPS search for southern extra-solar planets". Astronomy & Astrophysics 556: A110. doi:10.1051/0004-6361/201220237. Bibcode2013A&A...556A.110B.