Gliese 436 b

Gliese 436 b / Awohali
Size comparison of Awohali with Neptune
Discovery[1]
Discovered byButler, Vogt,
Marcy et al.
Discovery siteCalifornia, USA
Discovery dateAugust 31, 2004
Radial velocity, Transit
Designations
Awohali[2]
Orbital characteristics
0.028±0.01 AU
Eccentricity0.152+0.009
−0.008[3]
2.643904±0.000005[4] d
Inclination85.8+0.21
−0.25[4]
2451552.077[3]
325.8+5.5
−5.7[3]
Semi-amplitude17.38±0.17[3]
StarNoquisi
Physical characteristics
4.327 ± 0.183[5][6] R🜨
Mass21.36+0.20
−0.21[3] ME
Mean density
1.51 g/cm3 (0.055 lb/cu in)
1.18 g
Temperature712 K (439 °C; 822 °F)[5]

Gliese 436 b /ˈɡliːzə/ (sometimes called GJ 436 b,[7] formally named Awohali[2]) is a Neptune-sized exoplanet orbiting the red dwarf Gliese 436.[1] It was the first hot Neptune discovered with certainty (in 2007) and was among the smallest-known transiting planets in mass and radius, until the much smaller Kepler exoplanet discoveries began circa 2010.

In December 2013, NASA reported that clouds may have been detected in the atmosphere of GJ 436 b.[8][9][10][11]

  1. ^ a b Cite error: The named reference Butler2004 was invoked but never defined (see the help page).
  2. ^ a b Cite error: The named reference NEW2022 was invoked but never defined (see the help page).
  3. ^ a b c d e Cite error: The named reference Trifonov2018 was invoked but never defined (see the help page).
  4. ^ a b Cite error: The named reference bean was invoked but never defined (see the help page).
  5. ^ a b Cite error: The named reference deming was invoked but never defined (see the help page).
  6. ^ Confirmed, Pont, F.; Gilliland, R. L.; Knutson, H.; Holman, M.; Charbonneau, D. (2008). "Transit infrared spectroscopy of the hot neptune around GJ 436 with the Hubble Space Telescope". Monthly Notices of the Royal Astronomical Society: Letters. 393 (1): L6–L10. arXiv:0810.5731. Bibcode:2009MNRAS.393L...6P. doi:10.1111/j.1745-3933.2008.00582.x. S2CID 3746845.
  7. ^ Beust, Hervé; et al. (August 1, 2012). "Dynamical evolution of the Gliese 436 planetary system - Kozai migration as a potential source for Gliese 436b's eccentricity". Astronomy. 545: A88. arXiv:1208.0237. Bibcode:2012A&A...545A..88B. doi:10.1051/0004-6361/201219183. S2CID 10253533.
  8. ^ Harrington, J.D.; Weaver, Donna; Villard, Ray (December 31, 2013). "Release 13-383 - NASA's Hubble Sees Cloudy Super-Worlds With Chance for More Clouds". NASA. Archived from the original on January 2, 2014. Retrieved January 1, 2014.
  9. ^ Moses, Julianne (January 1, 2014). "Extrasolar planets: Cloudy with a chance of dustballs". Nature. 505 (7481): 31–32. Bibcode:2014Natur.505...31M. doi:10.1038/505031a. PMID 24380949. S2CID 4408861.
  10. ^ Knutson, Heather; et al. (January 1, 2014). "A featureless transmission spectrum for the Neptune-mass exoplanet GJ 436b". Nature. 505 (7481): 66–68. arXiv:1401.3350. Bibcode:2014Natur.505...66K. doi:10.1038/nature12887. PMID 24380953. S2CID 4454617.
  11. ^ Kreidberg, Laura; et al. (January 1, 2014). "Clouds in the atmosphere of the super-Earth exoplanet GJ 1214b". Nature. 505 (7481): 69–72. arXiv:1401.0022. Bibcode:2014Natur.505...69K. doi:10.1038/nature12888. hdl:1721.1/118780. PMID 24380954. S2CID 4447642.