Oral Presentation

Precessing Protostellar Outflows from a Potential Proto-Brown Dwarf System - IRAS 16253-2429

Tien-Hao Hsieh

We present a dynamical identification of a proto brown dwarf binary system IRAS 16253-2429. Our SMA observations suggest that IRAS 16253-2429 is hosting a binary system. The low mass of its envelope implies that the central objects may eventually accrete only ~0.14 Msun of material, which makes IRAS 16253-2429 a potential proto brown dwarf system; one or two brown dwarfs may form depending on the current mass of the protostars and the future accretion process. The SMA CO outflows show a periodic structure in the Position-Velocity diagram which may be related to the outflow wiggling from the binary rotation. This allowed us to estimate the orbital period of the binary system. On the basis of Kepler's third law, we suggest that IRAS 16253-2429 is very likely to contain at least one proto brown dwarf.