Gliese 832

Coordinates: Sky map 21h 33m 33.9752s, −49° 00′ 32.422″
Source: Wikipedia, the free encyclopedia.
Gliese 832
Gliese 832 is located in the constellation Grus.
Gliese 832 is located in the constellation Grus.
Gliese 832
Location of Gliese 832 in the constellation Grus

Observation data
Epoch J2000.0      Equinox J2000.0
Constellation Grus
Right ascension 21h 33m 33.97512s[1]
Declination −49° 00′ 32.3994″[1]
Apparent magnitude (V) 8.66[2]
Characteristics
Evolutionary stage
main-sequence star
Spectral type M2V[3]
B−V color index 1.52[2]
Distance
16.200 ± 0.002 ly
(4.9671 ± 0.0006 pc)
Absolute magnitude (MV)10.19[2]
Details
Gyr
TYC 8431-60-1, 2MASS J21333397-4900323[7]
Database references
Exoplanet Archive
data
Data sources:
Hipparcos Catalogue
,
HD

Gliese 832 (Gl 832 or GJ 832) is a

light years[1] and has a high proper motion of 818.16 milliarcseconds per year.[1] Gliese 832 has just under half the mass and radius of the Sun.[8] Its estimated rotation period is a relatively leisurely 46 days.[3] The star is roughly 6 billion years old.[6]

This star achieved

perihelion some 52,920 years ago when it came within an estimated 15.71 ly (4.817 pc) of the Sun.[9]

Gliese 832 emits X-rays.[10] Despite the strong flare activity, Gliese 832 is producing on average less ionizing radiation than the Sun. Only at extremely short radiation wavelengths (<50nm) does its radiation intensity rise above the level of quiet Sun, but does not reach levels typical for active Sun.[11]

Planetary system

Gliese 832 hosts one known planet, with a second planet having been refuted in 2022.[6]

The Gliese 832 planetary system[12]
Companion
(in order from star) 		Mass Semimajor axis
(AU) 		Orbital period
(years) 		Eccentricity Inclination Radius
b 0.8+0.12
−0.11 MJ 		3.53+0.15
−0.16 		9.88+0.34
−0.33 		0.069+0.026
−0.027 		54.9+6.6
−4.9 or 125.1+4.9
−6.6° 		—

Gliese 832 b

Main article: Gliese 832 b

In September 2008, it was announced that a

true mass 80% the mass of Jupiter.[12]

Gliese 832 c

Gliese 832 c was believed to be of super-Earth mass.[8] It was announced to orbit in the optimistic habitable zone but outside the conservative habitable zone of its parent star.[14] The planet Gliese 832 c was believed to be in, or very close to, the right distance from its sun to allow liquid water to exist on its surface.[8] However, doubts were raised about the existence of planet c by a 2015 study, which found that its orbital period is close to the stellar rotation period.[3] The existence of the planet was refuted in 2022, when a study found that the radial velocity signal shows characteristics of a signal originating from stellar activity, and not from a planet.[6]

The region between Gliese 832 b and where Gliese 832 c would be is a zone where additional planets are possible.[15]

Search for cometary disc

If this system has a comet disc, it is not "brighter than the fractional dust luminosity 10−5" according to a 2012 Herschel study.[16]

See also

  • List of nearest stars
  • List of extrasolar planets

Notes

  1. ^ Using the absolute visual magnitude of Gliese 832 and the absolute visual magnitude of the Sun , the visual luminosity can be calculated by

References

  1. ^
    S2CID 244398875
    . Gaia DR3 record for this source at VizieR.
  2. ^ a b c d e f Bailey, J.; Butler, R. P.; Tinney, C. G.; Jones, H. R. A.; O'Toole, S.; Carter, B. D.; Marcy, G. W. (2009). "A Jupiter-like Planet Orbiting the Nearby M Dwarf GJ832".
    S2CID 17172233
    .
  3. ^
    S2CID 119181646
    .
  4. ^
    S2CID 235435757
    . 40.
  5. S2CID 119216828
    .
  6. ^
    S2CID 249674385
    .
  7. ^ "Gliese 832". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2018-09-23.
  8. ^ a b c d "Nearby Alien Planet May Be Capable of Supporting Life", Mike Wall, Space.com, June 25, 2014, http://www.space.com/26357-exoplanet-habitable-zone-gliese-832c.html
  9. S2CID 59039482
    , A35.
  10. ^ Schmitt, J. H. M. M.; Fleming, T. A.; Giampapa, M. S. (1995). "The X-ray view of the low-mass stars in the solar neighborhood".
    doi:10.1086/176149
    .
  11. S2CID 119279568
    .
  12. ^
    S2CID 257663647
    .
  13. S2CID 119288366
    .
  14. ^ Wittenmyer, R.A.; Tuomi, M.; Butler, R.P.; Jones, H. R. A.; O'Anglada-Escude, G.; Horner, J.; Tinney, C.G.; Marshall, J.P.; Carter, B.D.; et al. (2014). "GJ 832c: A super-earth in the habitable zone". The Astrophysical Journal. 1406 (2): 5587.
    S2CID 12157837
    .
  15. S2CID 118663957
  16. ^ B. C. Matthews; forthcoming study promised in Lestrade, J.-F.; Matthews, B. C.; Sibthorpe, B.; Kennedy, G. M.; Wyatt, M. C.; Bryden, G.; Greaves, J. S.; Thilliez, E.; Moro-Martín, A.; Booth, M.; Dent, W. R. F.; Duchêne, G.; Harvey, P. M.; Horner, J.; Kalas, P.; Kavelaars, J. J.; Phillips, N. M.; Rodriguez, D. R.; Su, K. Y. L.; Wilner, D. J. (2012). "A DEBRIS Disk Around The Planet Hosting M-star GJ581 Spatially Resolved with Herschel".
    S2CID 53704989
    .


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