Análisis de Parámetros Físicos y Geométricos de un Grupo de Enanas Marrones Jóvenes

L. GRAMAJO, M. GÓMEZ, B. A. WHITNEY

Tafí del Valle - Tucuman

Jornada; Segundas Jornadas de Astrofísica Estelar; 2011

INSUGEO - Tucuman, Observatorio Astronómico de Córdoba

Substellar mass objects called brown dwarfs have masses below the H burning limit (0.080 M_Sun). In addition to field brown dwarfs, different surveys have detected around 80 of these objects, in various star-forming regions, with ages of about 10^6 yr. Several observations suggest that there is an analogy between the formation processes of T Tauri stars and brown dwarfs. In both cases it is essential the presence of a circumstellar disk and an accretion phase at very young ages. One way to derive physical and geometric properties of these young objects is through the modelling of spectral energy distributions (SEDs). In this paper we present initial results from the modelling of the SEDs of a group of six young brown dwarfs belonging to different nearby star-forming regions. These objects have scaled down T Tauri-like disks, with mass accretion rate of10^-10 M_Sun/yr, inner and outer radii of about 4 R_Sun and 60 AU, respectively. In addition these disks have flare parameters, similar to many T Tauri disks.