Is Gliese 581d habitable? Some constraints from radiative-convective climate modeling R. D. Wordsworth, F. Forget, F. Selsis, J.-B. Madeleine, E. Millour and V. Eymet A&A, 522 (2010) A22 Published online: 28 October 2010 DOI: 10.1051/0004-6361/201015053