First millimeter detection of the disk around a young, isolated, planetary mass object (Amelia Bayo; U. de Valparaiso)

Desde Mayo 03, 2017 13:15 hasta Mayo 03, 2017 13:45

En Instituto de Astrofísica, Pontificia Universidad Católica, Vicuña Mackenna 4860, Santiago, Chile

Categorías: Seminarios

OTS44 is one of only four free-floating planets known to have a disk. We have previously shown that it is the coolest and least massive known free-floating planet (~ 12 MJup) with a substantial disk that is actively accreting. We have obtained Band 6 (233 GHz) ALMA continuum data of this very young disk-bearing object. The data shows a clear unresolved detection of the source. We performed radiative transfer modeling of the full SED of the object and obtained disk mass estimates via empirical correlations derived for young, higher-mass, central (substellar) objects. The range of values obtained are between 0.07 and 0.63 MEarth (dust masses). We compare the properties of this unique disk with those recently reported around higher mass (brown dwarfs) young objects in order to infer constraints on its mechanism of formation. While extreme assumptions on dust temperature yield disk-mass values that could slightly diverge from the general trends found for more massive brown dwarfs, a range of sensible values provide disk-masses compatible with a unique scaling relation between MDust and MStar through the substellar domain down to planetary masses.