Poster title: Searching for Gas in Debris Disks

Poster abstract: A debris disk is commonly described as a second generation circumstellar disk composed of dust grains, 
planetesimals (asteroids and comets) and possibly already formed giant planets. Such bodies would be the remnants of the 
planetary formation process that took place around the star. It was long thought that debris disks were systems fully depleted of 
gas, but in the last few years the presence of gas has been detected in a handful of them. The nature of this gas is still under 
debate; it may be residual gas (leftover from earlier stages of the disk) or second generation gas (generated by falling evaporating 
bodies), however, both possibilities would have great implications in the process of planet formation and evolution. An efficient way 
to detect this gas in debris disks is monitoring gas tracers using multi-epoch high-resolution spectroscopy (e.g. Kiefer et al. 2014). 
In the course of my thesis, I am investigating the presence of gas in a sample of ~300 well constrained debris disks (Olofsson et 
al. in prep) in order to establish the frequency and main properties of their gaseous content.
The final goal is to determine the origin of these gaseous components, and look for correlations with the age and dust properties of 
the disks.
As a byproduct of this ongoing large project, in this poster I will be presenting three particularly interesting objects that exhibit two 
different gas features. I will discuss the possible origin of this gas based on its properties, and put this component in the context of 
the dust properties / distribution.