Gliese 1132

Gliese 1132 (often shortened to GJ 1132) is a small red dwarf star about 39 light-years (12 parsecs) away from Earth 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.[1]

Gliese 1132

Observation data Epoch J2000      Equinox J2000
Constellation	Vela
Right ascension	10^h 14^m 51.1^s
Declination	−47° 09′ 12″
Apparent magnitude (V)	14.7
Characteristics
Evolutionary stage	Main sequence
Spectral type	M4
Astrometry
Details
Mass	0.181 ± 0.019[1] M☉
Radius	0.2105 ^+0.0102 −0.0085[1] R☉
Luminosity	0.00438 ± 0.00034[1] L☉
Temperature	3270 ± 140 K
Rotation	122.3 ^+6.0 −5.0 days[1]
Other designations
GJ 1132
Database references
SIMBAD	1132 data
Extrasolar Planets Encyclopaedia	1132 data

Planetary System

The Gliese 1132 planetary system[1][2]

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 planets and one candidate planet orbiting GJ 1132.

Gliese 1132 b

Main article: Gliese 1132 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 R_⊕ and a mass of 1.66 M_⊕. It is slightly denser than Earth with 30% more surface gravity, meaning it has a rocky composition.[1] 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.[3]

Gliese 1132 c

Gliese 1132 c was reported by Bonfils et al. 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 M_⊕ 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.[1]

Gliese 1132 (d)

An unconfirmed cold Super-Earth candidate was also detected, with a minimum mass of about 8.4 M_⊕ 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.[1]

See also

• Wolf 1061

References

1. Bonfils, X & Almenara, Jose & Cloutier, R & Wünsche, Anaël & Astudillo-Defru, Nicola & Berta-Thompson, Zachory & Bouchy, F & Charbonneau, D & Delfosse, X & Díaz, Rodrigo & Dittmann, Jason & Doyon, Rene & Forveille, T & Irwin, J & Lovis, Christophe & Mayor, M & Menou, K & Murgas, F & Newton, E & Udry, S. (2018). Radial velocity follow-up of GJ1132 with HARPS. A precise mass for planet 'b' and the discovery of a second planet.
2. "GJ 1132 b CONFIRMED PLANET OVERVIEW PAGE". NASA Exoplanet Archive. Retrieved 2018-06-11.
3. Atmosphere around super-Earth detected, April 6, 2017, retrieved April 6, 2017