Luca Matrà

Composition of exocomets within extrasolar planetesimal belts

The detection of gas line emission (and stable absorption against the star for edge-on systems) in nearby planetesimal belts enables studies of the composition of exocomets within their natal reservoir.
I will begin by presenting the case for molecular CO emission being produced by exocometary gas release, and how this release may be used to estimate mass fractions and relative abundances of ice species in exocomets.
I will then discuss how the gas release from exocometary belts varies across planetary systems, and consider prospects for detection of cometary molecules other than CO. With most belt-hosting systems observed at ages of tens to hundreds of Myr, these measurements allow us to probe compositions at the most likely epochs of inward scattering and volatile delivery to inner young, and potentially dry, rocky planets.