S E M I N A R IDepartament d'Astronomia i Astrofísica
Universitat de València
Star formation at radio wavelengths: proto-brown dwarfs and protoplanetary disks
Itziar de Gregorio-Monsalvo
Seminari del departament d'Astronomia i AstrofÃsica
Dijous 07 novembre 2013
I will present my latest studies on two different topics: the formation of brown dwarfs (BDs) and the structure of the protoplanetary disks. The formation of BDs is currently a hot topic of research. Since stars and BDs evolve very rapidly during the first million years, many answers to the formation mechanism must come from the study of their properties when they are deeply embedded in the natal cloud (proto-BD stage). Sensitive millimeter and submillimeter surveys offer the exciting prospect of identifying a population of candidate proto-BDs for the first time, as well as studying BD disk properties. In this talk I will present a multiwavelength study in Taurus, Chamaeleonis II and Barnard 30 star forming regions aiming to search for the best proto-BD candidates of the region. As a second topic, I will show the results of very high-resolution and sensitive observation using ALMA towards the disk surrounding the intermediate mass young star HD163296. Dust and gas-rich disks around recently-formed stars are important as they harbor planets either recently formed or in the process of formation. Consequently, the structure of these young protoplanetary disks has been the subject of intense study over a wide range of wavelengths. HD163296 is one of the best-studied protoplanetary disks, and was one of the first to be resolved with mm-interferometry. I will present the detailed radial and vertical structure of this protoplanetary disk and the implications of these results for current theoretical models.