The Outburst of EX Lup -
Observational Constraints on Crystallization and Vertical Mixing in the Disk
First Author:
Attila Juhasz
Email: juhasz AT mpia.de
Max-Planck-Institute for Astronomy
Koenigstuhl 17
Heidelberg D69117 Germany
Abstract
EX Lup, the prototype of the EXor class of young eruptive stars, reported to show the most recent outburst in January 2008. The amplitude of the brightening at visual wavelengths was about 4 mag, the highest since the 1950s. We used this opportunity to observe EX Lup at all possible wavelengths from optical to sub-millimeter in order to study the mechanism of the outburst and look for the formation of silicate crystals during the outburst. We modelled the SED and the mid-infrared visibilities of EX Lup in the outburst and then during the fading using a 2D radiative transfer code and a vertical mixing code, with specialattention to the 10 um silicate feature. We discuss the observational results of Spitzer IRS and VLTI/MIDI measurements and their implications to the formation of crystalline silicates and the vertical mixing in the disk.
