SO Webloquio: Searching for the formation mechanisms of brown dwarfs

New generation of Submillimeter facilities in the North of Chile, like the APEX antenna and the Atacama Large Millimeter/submillimeter Array (ALMA), offers for the first time the possibility for studying the formation of stars, brown dwarfs, and planets with unprecedented sensitivity and angular resolution in the millimeter/submillimeter regime. The formation of Brown Dwarfs (BDs) is a debated topic of research. The most widely discussed scenarios for the formation of BDs include turbulent fragmentation, disk fragmentation and subsequent ejection, photo-evaporation of massive pre-stellar cores and ejection from multiple protostellar systems. In the last decade the presence of circumstellar disks around BDs, as well as jets, herbig haro objects, outflows, and accretion have been identified. ALMA observations helped to characterize the properties of the dust and gas disks surrounding these objects, constraining their masses and radii, and revealing the presence of grain growth to mm-grain sizes in the disk, which suggests the potential of finding rocky planets surrounding BDs. In the most recent works the presence of resolved cavities around BDs and very low mass stars has made these objects good laboratories to study disk evolution and planet formation. For more than a decade our team made an effort to shed light into the different formation mechanisms of these substellar objects using a multi-wavelength and a multi-technique approach, where ALMA has played a key role. In this talk I will provide an overview on these studies that involves observations from optical to centimeter wavelengths and the different strategies applied to search for the best pre- and proto-BDs candidates in various molecular clouds.

25/03/2021 - 12:30
Dr. Itziar de Gregorio Monsalvo
ESO Chile