The Fulton gap (also the radius valley)[citation needed] is the 2017 discovery that it is uncommon for planets to have a size between 1.5 and 2 times that of Earth.[1][2] The Fulton Gap is named after Benjamin J. Fulton, who first described the phenomena in his doctoral thesis, for which he won the Robert J. Trumpler Award.[3][4]

..., refined studies of the distribution of planets within the 1 – 4 R🜨 range have revealed a significant drop in the population, or "Fulton gap" between 1:5 – 2:0 R🜨(Fulton et al. 2017) (Owen & Wu 2013), which is not yet well-understood.

— Peterson et al., A 2 Earth Radius Planet Orbiting the Bright Nearby K-Dwarf Wolf 503[5]

See alsoEdit


  1. ^ "New exoplanet found very close to its star: Twice size of Earth, Wolf 503b orbits star every six days". ScienceDaily. 2018-09-11. Retrieved 2018-09-11. One recent discovery also shows that there are significantly fewer planets that are between 1.5 and 2 times the size of Earth than those either smaller or larger than that. This drop, called the Fulton gap, could be what distinguishes the two types of planets from each other, researchers say in their study of the discovery, published in 2017.
  2. ^ "September 6, 2018: Mind the Fulton Gap". 2018 Exoplanet Archive News. Archived from the original on 2018-09-08. Retrieved 2018-09-11.
  3. ^ "BJ Fulton Wins 2018 Robert J. Trumpler Award for 'Landmark' Exoplanet Discovery Using Keck Observatory". W.M. Keck Observatory. 2018-09-10. Retrieved 2018-09-11.
  4. ^ "IfA graduate receives prestigious award for work on extrasolar planets". University of Hawaiʻi System News. 2018-08-15. Retrieved 2018-09-11.
  5. ^ Peterson, Merrin S.; Benneke, Bjö; Dressing, Courtney D.; David, Trevor J.; Ciardi, David; Crossfield, Ian J. M.; Mamajek, Eric E.; Schlieder, Joshua E.; Petigura, Erik A.; Christiansen, Jessie L.; Fulton, Benjamin J.; Howard, Andrew W.; Sinukoff, Evan; Beichman, Charles; Quinn, Sam; Latham, David W.; Yu, Liang; Shporer, Avi; Henning, Thomas; Huang, Chelsea X.; Kosiarek, Molly R.; Dittmann, Jason; Isaacson, Howard (2018-06-09). "A 2 Earth Radius Planet Orbiting the Bright Nearby K-Dwarf Wolf 503" (PDF). The Astronomical Journal. 156 (5): 188. arXiv:1806.03494. doi:10.3847/1538-3881/aaddfe.

External linksEdit

  • Fulton, Benjamin J.; Petigura, Erik A.; Howard, Andrew W.; Isaacson, Howard; Marcy, Geoffrey W.; Cargile, Phillip A.; Hebb, Leslie; Weiss, Lauren M.; Johnson, John Asher; Morton, Timothy D.; Sinukoff, Evan; Crossfield, Ian J. M.; Hirsch, Lea A. (2017-08-24). "The California-Kepler Survey. III. A Gap in the Radius Distribution of Small Planets". The Astronomical Journal. 154 (3): 109. arXiv:1703.10375. doi:10.3847/1538-3881/aa80eb. ISSN 1538-3881.