Habitable zones around main-sequence stars: Dependence on planetary mass

Ravi Kumar Kopparapu, Ramses M. Ramirez, James Schottelkotte, James F. Kasting, Shawn Domagal-Goldman, Vincent Eymet

Research output: Contribution to journalArticle

195 Citations (Scopus)

Abstract

The ongoing discoveries of extra-solar planets are unveiling a wide range of terrestrial mass (size) planets around their host stars. In this Letter, we present estimates of habitable zones (HZs) around stars with stellar effective temperatures in the range 2600 K-7200 K, for planetary masses between 0.1 M and 5 M . Assuming H2O-(inner HZ) and CO2-(outer HZ) dominated atmospheres, and scaling the background N2 atmospheric pressure with the radius of the planet, our results indicate that larger planets have wider HZs than do smaller ones. Specifically, with the assumption that smaller planets will have less dense atmospheres, the inner edge of the HZ (runaway greenhouse limit) moves outward (∼10% lower than Earth flux) for low mass planets due to larger greenhouse effect arising from the increased H2O column depth. For larger planets, the H2O column depth is smaller, and higher temperatures are needed before water vapor completely dominates the outgoing longwave radiation. Hence the inner edge moves inward (∼7% higher than Earth's flux). The outer HZ changes little due to the competing effects of the greenhouse effect and an increase in albedo. New, three-dimensional climate model results from other groups are also summarized, and we argue that further, independent studies are needed to verify their predictions. Combined with our previous work, the results presented here provide refined estimates of HZs around main-sequence stars and provide a step toward a more comprehensive analysis of HZs.

Original languageEnglish (US)
Article numberL29
JournalAstrophysical Journal Letters
Volume787
Issue number2
DOIs
StatePublished - Jun 1 2014

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planetary mass
main sequence stars
planets
planet
greenhouse effect
atmospheres
stars
climate models
greenhouses
three dimensional models
extrasolar planets
estimates
albedo
water vapor
atmosphere
atmospheric pressure
longwave radiation
scaling
climate modeling
radii

All Science Journal Classification (ASJC) codes

  • Astronomy and Astrophysics
  • Space and Planetary Science

Cite this

Kopparapu, R. K., Ramirez, R. M., Schottelkotte, J., Kasting, J. F., Domagal-Goldman, S., & Eymet, V. (2014). Habitable zones around main-sequence stars: Dependence on planetary mass. Astrophysical Journal Letters, 787(2), [L29]. https://doi.org/10.1088/2041-8205/787/2/L29
Kopparapu, Ravi Kumar ; Ramirez, Ramses M. ; Schottelkotte, James ; Kasting, James F. ; Domagal-Goldman, Shawn ; Eymet, Vincent. / Habitable zones around main-sequence stars : Dependence on planetary mass. In: Astrophysical Journal Letters. 2014 ; Vol. 787, No. 2.
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Kopparapu, RK, Ramirez, RM, Schottelkotte, J, Kasting, JF, Domagal-Goldman, S & Eymet, V 2014, 'Habitable zones around main-sequence stars: Dependence on planetary mass', Astrophysical Journal Letters, vol. 787, no. 2, L29. https://doi.org/10.1088/2041-8205/787/2/L29

Habitable zones around main-sequence stars : Dependence on planetary mass. / Kopparapu, Ravi Kumar; Ramirez, Ramses M.; Schottelkotte, James; Kasting, James F.; Domagal-Goldman, Shawn; Eymet, Vincent.

In: Astrophysical Journal Letters, Vol. 787, No. 2, L29, 01.06.2014.

Research output: Contribution to journalArticle

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