GJ 1132 b

GJ 1132 b
Size comparison of GJ 1132 b with Earth
Discovery[1]
Discovered byMEarth-South Array Team
Discovery site Chile
Discovery dateMay 10, 2015 (announced)[2] November 12, 2015 (confirmed)[3]
Transit
Orbital characteristics[4][5]
0.01570±0.00013 AU
Eccentricity0.0118+0.047
−0.0099
1.62892911+0.00000029
−0.00000030 d
Inclination86.58°±0.63°[6]
Semi-amplitude2.98±0.30 m/s
StarGJ 1132
Physical characteristics[7]
1.130±0.056 R🜨
Mass1.66±0.23 M🜨
Mean density
6.3±1.3 g/cm3
12.9±2.2 m/s2
13.6±1.0 km/s
Albedo0.19+0.12
−0.15[4]
Temperature583.8+11
−8.5 K (310.6 °C; 591.2 °F, equilibrium)[4]
709±31 K (436 °C; 817 °F, day side)[4]
Atmosphere
Composition by volumeNone or extremely thin[4]

GJ 1132 b (also known as Gliese 1132 b) is an exoplanet orbiting GJ 1132, a red dwarf star 41 light-years (13 parsecs) from Earth,[1] in the constellation Vela. The planet is considered uninhabitable but was thought to be cool enough to possess an atmosphere.[2] GJ 1132 b was discovered by the MEarth-South array in Chile.[8]

It had been called "one of the most important planets ever discovered beyond the Solar System": Due to its relative proximity to Earth, telescopes should have been able to determine the composition of its atmosphere, the speed of its winds and the color of its sunsets,[9][10][11] if an atmosphere was present. This is due in part to the small diameter of its parent star (20% that of the Sun), which increases the effect on the star's light of its transits. The planet's diameter is approximately 20% larger than that of the Earth[1] and its mass is estimated at 1.6 times that of Earth,[2] implying that it has an Earth-like rocky composition.[12] GJ 1132 b orbits its star every 1.6 days at a distance of 1.4 million miles (2.24 million kilometres).[8]

The planet receives 19 times more stellar radiation than Earth.[1] The equilibrium temperature is estimated at 529 K (256 °C; 493 °F) for an Earth-like albedo, or 409 K (136 °C; 277 °F) for a Venus-like albedo. The planet is likely to be hotter than Venus, as higher temperatures likely prevail at the surface if the planet has an atmosphere.[12]

  1. ^ a b c d Cite error: The named reference Berta-Thompson2015 was invoked but never defined (see the help page).
  2. ^ a b c Chu, Jennifer (November 11, 2015). "New exoplanet in our neighborhood". MIT News. Retrieved 2015-11-12.
  3. ^ NASA Exoplanet Archive New ticker slide 1
  4. ^ a b c d e Cite error: The named reference Xue2024 was invoked but never defined (see the help page).
  5. ^ Cite error: The named reference Kokori2023 was invoked but never defined (see the help page).
  6. ^ Cite error: The named reference Southworth2017 was invoked but never defined (see the help page).
  7. ^ Cite error: The named reference Bonfils_et_al_2018 was invoked but never defined (see the help page).
  8. ^ a b "Astronomers Eager to Get a Whiff of Newfound Venus-like Planet". Harvard–Smithsonian Center for Astrophysics. November 11, 2015. Retrieved 2015-11-12.
  9. ^ Sample, Ian (11 November 2015). "Earth-like world could be 'most important planet found outside solar system'". The Guardian. Retrieved 2015-11-11.
  10. ^ Burgess, Matt. "Exoplanet GJ 1132b: the 'most important' ever found". Wired UK. Retrieved 2015-11-12.
  11. ^ "Getting Up Close and Personal with an Earth-Sized Exoplanet". The Kavli Foundation. November 11, 2015. Archived from the original on 2017-06-07. Retrieved 2015-11-13.
  12. ^ a b Eva Botkin-Kowacki (2015-11-11). "Spotted: A rocky Earth-sized planet close by". The Christian Science Monitor.