Hot Neptune

A hot Neptune or Hoptune[1] is a type of giant planet with a mass similar to that of Uranus or Neptune in an orbit close to its star, normally less than 1 AU.[2] The first hot Neptune to be discovered with certainty was Gliese 436 b in 2007, an exoplanet about 33 light years away. Recent observations have revealed a larger potential population of hot Neptunes in the Milky Way than previously thought.[3]

General characteristics

Because of their close proximity to their parent star, hot Neptunes have a much greater rate and chance of transiting their star as seen from a farther outlying point, than planets of the same mass in larger orbits. This increases the chances of discovering them by transit-based observation methods.

Transiting hot Neptunes include Gliese 436 b and HAT-P-11b, which was recently observed by the Kepler mission. Gliese 436 b (also known as GJ 436b) was the first hot Neptune to be discovered with certainty in 2007. The exoplanet Mu Arae c (or HD 160691 c) discovered in 2004 might also be a hot Neptune, but it has not been determined definitively.

The first theoretical study of how hot Neptunes could form was carried out in 2004.[4]

See also

References

  1. ↑ Dong; et al. (23 June 2017). "LAMOST Reveals Neptune-size Cousins of hot Jupiters, preferentially in "(metal-)rich" and "one-child" Kepler families". arXiv:1706.07807 Freely accessible.
  2. ↑ G. Wuchterl. "Hot Neptunes: A Key To Giant Planet Formation" (PDF). cosis.net. Retrieved 3 August 2015.
  3. ↑ Oligarchic formation of hot Neptunes
  4. ↑ Adrián Brunini and Rodolfo G. Cionco (September 2005). "The origin and nature of Neptune-like planets orbiting close to solar type stars". Icarus. Elsevier. 177: 264–68. Bibcode:2005Icar..177..264B. arXiv:astro-ph/0511051 Freely accessible. doi:10.1016/j.icarus.2005.02.015. Retrieved 3 August 2015.

Sources


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