Gliese 832

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Gliese 832
Grus constellation map.svg
Red pog.png
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]
Astrometry
Radial velocity (Rv)12.72±0.13 [1]  km/s
Proper motion (μ)RA: −45.917  mas/yr [1]
Dec.: −816.875  mas/yr [1]
Parallax (π)201.3252 ± 0.0237  mas [1]
Distance 16.200 ± 0.002  ly
(4.9671 ± 0.0006  pc)
Absolute magnitude  (MV)10.19 [2]
Details
Mass 0.441 ± 0.011 [4]   M
Radius 0.442 ± 0.018 [4]   R
Luminosity (bolometric)0.0276 ± 0.0009 [4]   L
Luminosity (visual, LV)0.007 [note 1]   L
Surface gravity (log g)4.7 [2]   cgs
Temperature 3,539+79
−74
[4]   K
Metallicity [Fe/H]−0.06 ± 0.04 [5]   dex
Rotation 37.5+1.4
−1.5
 d
[6]
Age 6±1.5 [6]   Gyr
Other designations
CD−49°13515, GJ  832, HD  204961, HIP  106440, L  354-89, LHS  3685, PLX  5190, TIC  139754153, TYC  8431-60-1, 2MASS J21333397-4900323 [7]
Database references
SIMBAD The star
planet c
planet b
Exoplanet Archive data
Data sources:
Hipparcos Catalogue,
HD

Gliese 832 (Gl 832 or GJ 832) is a red dwarf of spectral type M2V in the southern constellation Grus. [8] The apparent visual magnitude of 8.66 [2] means that it is too faint to be seen with the naked eye. It is located relatively close to the Sun, at a distance of 16.2 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]

Contents

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] No additional planets were found as of 2024. [12]

The Gliese 832 planetary system [13]
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

In September 2008, it was announced that a Jupiter-like planet, designated Gliese 832 b, had been detected in a long-period, near-circular orbit around this star, with a false alarm probability of a negligible 0.05%. It would induce an astrometric perturbation on its star of at least 0.95 milliarcseconds and is thus a good candidate for being detected by astrometric observations. Despite its relatively large angular distance, direct imaging is problematic due to the star–planet contrast. [2] The orbital solution of the planet was refined in 2011. [14] In 2023, an astrometric detection of the planet was announced, determining its inclination and revealing a true mass 80% the mass of Jupiter. [13]

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. [15] 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. [16]

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. [17]

See also

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

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