The habitability of Proxima Centauri b - II. Possible climates and observability Martin Turbet, Jérémy Leconte, Franck Selsis, Emeline Bolmont, François Forget, Ignasi Ribas, Sean N. Raymond and Guillem Anglada-Escudé A&A, 596 (2016) A112 Published online: 12 December 2016 DOI: 10.1051/0004-6361/201629577