GJ 1132

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GJ 1132
Observation data
Epoch J2000      Equinox J2000
Constellation Vela
Right ascension 10h 14m 51.77869s[1]
Declination −47° 09′ 24.1928″[1]
Apparent magnitude (V) 13.46[2]
Characteristics
Evolutionary stage Main sequence
Spectral type M4[2]
Distance
41.119 ± 0.009 ly
(12.607 ± 0.003 pc)
Details
Mass0.194±0.005[3] M☉
Radius0.215±0.009[3] R☉
Luminosity0.00436±0.00013[3] L☉
Temperature3,196±71[3] K
Rotation122.3+6.0
−5.0 d[4]
GCRV 26265, 2MASS J10145184-4709244, WISEA J101450.66-470919.7 [RHG95] 1608[5]
Database references
Exoplanet Archive
data

GJ 1132 is a small red dwarf star 41.1 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.[6] In 2018, a second planet and a potential third were revealed.[4]

Planetary system

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

GJ 1132 b

Main article: GJ 1132 b

GJ 1132 b is the innermost planet of the GJ 1132 system, as well as the smallest. It is very similar in size and mass to Earth, with a radius of 1.13 R🜨 and a mass of 1.66 ME. It is slightly denser than Earth with 30% more surface gravity, meaning it has a rocky composition.[4] 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. As of 2022, it remains unclear whether the planet has an atmosphere, with some studies finding evidence for an atmosphere,[7][8] but others finding a flat, featureless spectrum that leaves the presence or absence of an atmosphere inconclusive.[9][10][11]

GJ 1132 c

GJ 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 ME 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 GJ 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.[4]

GJ 1132 d

An unconfirmed cold super-Earth candidate was also detected, with a minimum mass of about 8.4 ME and a low equilibrium temperature of 111 K (−162 °C; −260 °F). It has been designated GJ 1132 (d) with parenthesis because it is not considered a confirmed planet. Despite the signal having a false alarm probability of less than 0.01%, comparable to GJ 1132 b and c, it is close to the period of the star's magnetic cycle.[4]

The GJ 1132 planetary system[4][12]
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 1.6289304(13)[13] <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 — —

See also

References

  1. ^
    S2CID 244398875
    . Gaia DR3 record for this source at VizieR.
  2. ^
    doi:10.1086/191069
    .
  3. ^
    S2CID 235435757
    . 40.
  4. ^
    S2CID 119394477
    , A142.
  5. ^ "GJ 1132". SIMBAD. Centre de données astronomiques de Strasbourg. Retrieved 2020-08-31.
  6. S2CID 4385619
    .
  7. ^ "Atmosphere around super-Earth detected", phys.org, April 6, 2017, retrieved April 6, 2017.
  8. S2CID 232170188
    .
  9. S2CID 119061941
    .
  10. S2CID 233025360
    .
  11. S2CID 235125875
    .
  12. ^ "GJ 1132 b Confirmed Planet Overview Page", NASA Exoplanet Archive, retrieved 2018-06-11.
  13. doi:10.3847/1538-4365/ac9da4. Vizier catalog entry
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