Spectral Characterization of the Young Giant Planet AF Leporis b

The exoplanet AF Lep b was detected by direct imaging follow-up of an accelerating young star in the beta Pictoris moving group. The combination of a precise astrometric mass and a well-constrained moving group age make this planet a key benchmark for understanding how the nature and evolution of giant planet atmospheres. We present new spectra of AF Lep b and a new analysis of its physical properties from its SED, as well as from its absolute and relative astrometry. Along with PZ Tel B, HR 7329 B, beta Pic b and c, and 51 Eri b, AF Lep b is part of an important isochronal sequence of substellar companions in the beta Pictoris moving group, spanning over an order of magnitude in mass.