Query : 2011A&A...526A.135H

2011A&A...526A.135H - Astronomy and Astrophysics, volume 526A, 135-135 (2011/2-1)

Radiative constraints on the habitability of exoplanets Gliese 581c and Gliese 581d.

HU Y. and DING F.

Abstract (from CDS):

The M-type star Gliese 581 is likely to have two super-Earth planets, i.e., Gl 581c and Gl 581d. The present study is to investigate their habitability constrained by radiative properties of their atmospheres and the threshold of carbon-dioxide (CO2), assuming that the two exoplanets are terrestrial, and that they have similar outgassing processes to those of the terrestrial planets in our own solar system. Radiative-convective atmospheric models are used. Different values of CO2 concentrations and water-vapor mixing ratios are tested. Our simulation results suggest that Gl 581d is probably a habitable planet. However, at least 6.7 bars of CO2 are required to raise its surface temperature (Ts) above the freezing point of water. In contrast, Gl 581c might have experienced runaway greenhouse, like Venus, because of its too high surface temperature and the lack of an effective cold trap for water vapor. We compare our results with other independent studies.

Abstract Copyright:

Journal keyword(s): planetary systems - radiative transfer - planets and satellites: atmospheres - stars: individual: Gl 581

Simbad objects: 4

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Number of rows : 4
N Identifier Otype ICRS (J2000)
ICRS (J2000)
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
1 BD-07 4003 BY* 15 19 26.8269387505 -07 43 20.189497466 13.403 11.76 10.560 9.461 8.911 M3V 593 2
2 BD-07 4003d Pl 15 19 26.8271336166 -07 43 20.190958776           ~ 145 1
3 BD-07 4003c Pl 15 19 26.8271336166 -07 43 20.190958776           ~ 102 1
4 HD 189733b Pl 20 00 43.7130382888 +22 42 39.071811263           ~ 1268 1

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