Seminario: A. Petralia (INAF) giorno 14 Gennaio ore 10.00

Stanza Google Meet: https://meet.google.com/jsc-eufh-iek?authuser=1

Speaker: Antonino Petralia (INAF)

Titolo: ‘The impact of water vapour in shaping super-Earth atmospheres’

Abstract:  We present radiative-convective modelling of an extensive grid of
clear-sky atmospheres embedding Super-Earths, whose chemical
compositions include CO2, H2O, and N2. Simulations are performed with
varying molecular concentration in thin and thick atmospheres, around
main sequence stars (from M to F types), and over a wide range of
stellar fluxes and temperatures. Results are compared with those of
simulations carried out over the same grid, but in strictly dry
conditions. We learn that the presence of water may play a regulatory
role in tempering both cold and hot climates, favouring the potential
habitability of a modelled planet. In cold environments, water limits
the fall of atmospheric temperatures, while at warmer regimes it forces
carbon dioxide to act as an anti-greenhouse gas. Potentially habitable
planets may be located rather far from the central star, depending on
the radiative conditions.