Gliese 1132

Summary

Gliese 1132
Observation data
Epoch J2000      Equinox J2000
Constellation Vela
Right ascension 10h 14m 51.7783s[1]
Declination −47° 09′ 24.1897″[1]
Apparent magnitude (V) 13.46[2]
Characteristics
Evolutionary stage Main sequence
Spectral type M4[2]
Astrometry
Proper motion (μ) RA: −1,053.979[1] mas/yr
Dec.: +414.300[1] mas/yr
Parallax (π)79.2543 ± 0.0438[1] mas
Distance41.15 ± 0.02 ly
(12.618 ± 0.007 pc)
Details
Mass0.181±0.019[3] M
Radius0.2105+0.0102
−0.0085
[3] R
Luminosity0.00438±0.00034[3] L
Temperature3,270±140 K
Rotation122.3+6.0
−5.0
 d
[3]
Other designations
RAVE J101451.9-470925, Gaia DR2 5413438219396893568, GJ 1132, L 320-124, LFT 707, LHS 281, LTT 3758, NLTT 23819, PM 10129-4655, PM J10148-4709, GCRV 26265, 2MASS J10145184-4709244[4]
Database references
SIMBADdata
Exoplanet Archivedata
Extrasolar Planets
Encyclopaedia
data

Gliese 1132 (often shortened to GJ 1132) is a small red dwarf star about 41 light-years (12.6 parsecs) away from Earth[1] in the constellation Vela. In 2015, it was revealed to have a hot rocky Earth-sized planet orbiting it every 1.6 days, which was later determined to have an atmosphere. In 2018, two more potential planets were revealed.[3]

Planetary System

The Gliese 1132 planetary system[3][5]
Companion
(in order from star)
Mass Semimajor axis
(AU)
Orbital period
(days)
Eccentricity Inclination Radius
b 1.66 ± 0.23 M🜨 0.0153 ± 0.0005 1.628931 ± 0.000027 <0.22 86.58 ± 0.63° 1.13 ± 0.056 R🜨
c >2.64 ± 0.44 M🜨 0.0476 ± 0.0017 8.929 ± 0.010 <0.27
d (unconfirmed) >8.4 +1.7
−2.5
 M🜨
0.35 ± 0.01 176.9 ± 5.1 <0.53

As of June 12, 2018, there are two confirmed exoplanets and one candidate exoplanet orbiting GJ 1132.

Companion b

Gliese 1132 b is the innermost planet of the Gliese 1132 system, as well as the smallest. It is very similar in size and mass to Earth, with a radius of 1.13 REarth and a mass of 1.66 MEarth. It is slightly denser than Earth with 30% more surface gravity, meaning it has a rocky composition.[3] Despite its physical similarities to Earth, it is considered too hot to be habitable, getting 19 times more sunlight due to its 1.6 day orbital period. In April 2017, it was revealed that the planet has an atmosphere, potentially rich in water vapor and methane.[6]

Companion c

Gliese 1132 c was reported by Bonfils and colleagues using the HARPS spectrograph on the ESO 3.6 m Telescope at the La Silla Observatory in Chile in June 2018. No transits of the planet were found, but it has a minimum mass of about 2.6 MEarth and gets 1.9 times the amount of sunlight as Earth with an equilibrium temperature of 300 K (27 °C; 80 °F). It orbits outside the inner limit of Gliese 1132's habitable zone (which ends at 1.6 times the stellar flux of Earth), but because the exact characteristics of the planet's atmosphere are unknown, it has been mentioned that it could still be potentially habitable. However, with a lack of transits, determining its atmospheric characteristics will be extremely difficult.[3]

Companion (d)

An unconfirmed cold Super-Earth candidate was also detected, with a minimum mass of about 8.4 MEarth and a low equilibrium temperature of 111 K (−162 °C; −260 °F). It has been designated Gliese 1132 (d) with parenthesis because it has not been accepted as a confirmed planet. Despite the signal having a false alarm probability of less than 0.01%, comparable to Gliese 1132 b and c, it is close to the period of the star's magnetic cycle.[3]

See also

References

  1. ^ a b c d e f Brown, A. G. A.; et al. (Gaia collaboration) (August 2018). "Gaia Data Release 2: Summary of the contents and survey properties". Astronomy & Astrophysics. 616. A1. arXiv:1804.09365. Bibcode:2018A&A...616A...1G. doi:10.1051/0004-6361/201833051. Gaia DR2 record for this source at VizieR.
  2. ^ a b Bidelman, W. P. (October 1985), "G. P. Kuiper's spectral classifications of proper-motion stars", The Astrophysical Journal Supplement Series, 59: 197–227, Bibcode:1985ApJS...59..197B, doi:10.1086/191069.
  3. ^ a b c d e f g h i Bonfils, X.; et al. (October 2018), "Radial velocity follow-up of GJ1132 with HARPS. A precise mass for planet 'b' and the discovery of a second planet", Astronomy & Astrophysics, 618: 12, arXiv:1806.03870, Bibcode:2018A&A...618A.142B, doi:10.1051/0004-6361/201731884, A142.
  4. ^ "GJ 1132". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2020-08-31.
  5. ^ "GJ 1132 b Confirmed Planet Overview Page", NASA Exoplanet Archive, retrieved 2018-06-11.
  6. ^ "Atmosphere around super-Earth detected", phys.org, April 6, 2017, retrieved April 6, 2017.