Title : GW Ori: a unique target for studying protoplanetary disk evolution

　　Speaker: Min Fang (房敏) University of Arizona, Autonomous University of Madrid, Purple
    Mountain Observatory

　　Time: April 21st, 2015, 14:00

　　Location: Middle conference room, 3rd floor

　　Abstract ：

Disks are expected to dissipate quickly in binary or multiple systems. Investigating such systems can improve our knowledge of the disk dispersal. The triple pre-main sequence stellar system GW Ori, still harboring a massive disk, is an excellent target. I have studied GW Ori using a large set of multi-wavelength photometric and spectral data ranged from optical bands to millimeter wavelengths. I will talk about its wind and accretion activity. The wind is found to be launched near the orbit of the second companion, and can be modulated by its orbit motion. I will compare the accretion activity of GW Ori with the predictions from the simulations of Artymowicz & Lubow (1996), and show how our results contradict with their simulations. I will present the results on study the variations in the SED of GW Ori which exhibits dramatic changes on timescales of ?20 yr in the near-infrared bands, implying a major readjustment of the inner disk on short timescales. In this talk, I will also present the first spatially-resolved millimeter interferometric observations of the disk around GW~Ori, obtained with the the Submillimeter Array (SMA), both in continuum and in the 12CO (J=2-1), 13CO (J=2-1), and C18O (J=2-1) lines. I will present the results on the disk of GW Ori by the simultaneous modelling of its SED and SMA data in continuum and gas line emission.