Abstract

(Marino) In this talk I will present five new ALMA observations of systems with debris discs. These observations illustrate how debris discs and ALMA observations can provide essential pieces of information to understand the properties and diversity of planetary systems. In particular, I will show how we can learn about: 1) the presence of icy-rich bodies and their volatile content; 2) exocomets delivering volatiles to the inner regions of a system; 3) where do planetesimals form?; 4) evidence of gaps carved by planets at 10s of AU in debris discs.

(von-Boetticher) Low-mass eclipsing binaries (EBLMs), detected as false-positives by planet-searching surveys, enable empirical measurements of the stellar mass-radius relation for low-mass stars. I will present results on EBLM J0555 -57Ab, a dense, very low-mass star at the hydrogen burning limit. EBLM J0555 -57Ab has a mass of 85 ± 4MJup and radius of 0.84 (+0.14,-0.04) RJup, comparable in size to Saturn, and is one of the densest non-stellar-remnant objects currently known.