J/ApJ/787/L29 Habitable zones around main-sequence stars (Kopparapu+, 2014)
Habitable zones around main-sequence stars: dependence on planetary mass.
Kopparapu R.K., Ramirez R.M., Schottelkotte J., Kasting J.F.,
Domagal-Goldman S., Eymet V.
<Astrophys. J., 787, L29 (2014)>
=2014ApJ...787L..29K 2014ApJ...787L..29K (SIMBAD/NED BibCode)
ADC_Keywords: Stars, double and multiple ; Planets ; Models, evolutionary
Keywords: planets and satellites: atmospheres
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{earth} and 5 M{earth}. 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.
Description:
Language: Fortran 90
Code tested under the following compilers/operating systems:
ifort/CentOS linux Description of input data: No input necessary.
Description of output data: Output files: HZs.dat, HZ_coefficients.dat
System requirements: No major system requirement. Fortran compiler
necessary.
Calls to external routines: None.
Additional comments: None
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
HZs.f90 89 124 FORTRAN program
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See also:
J/A+A/567/A133 : Habitable zone code (Valle+, 2014)
J/ApJ/770/90 : Candidate planets in the habitable zones (Gaidos, 2013)
History:
From electronic version of the journal
(End) Prepared by [AAS], Tiphaine Pouvreau [CDS] 03-Aug-2017