Other
Scientific paper
May 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011iaus..280e..35t&link_type=abstract
The Molecular Universe, Proceedings of the 280th Symposium of the International Astronomical Union held in Toledo, Spain, May 30
Other
Scientific paper
We will review the current modelling and data analysis efforts undertaken in the framework of the Herschel-GASPS program. We have simultaneously modelled in details the atomic and molecular gas and dust contents of two TTauri disks (TW Hya1 and Eta Cha Recx 152) and two HerbigAe disks (HD 1691423 and HD 1632964). The gas observations were taken as part of the open time key program GaS in Protoplanetary Systems (GASPS, P.I. Dent5). The program aims at a systematic study of the gas and dust in over 250 protoplanetary disks. We observed the OI and CII fine-structure emission lines as well as a few high-J CO, OH, CH+, and water lines. We have complemented the gas constraints with ancilliary data from the literature and from our own observation programs: CO millimetre and H2 observations, continuum fluxes, optical spectra, etc. The modelling uses the combination of two state-of-the-art codes: the Monte-Carlo continuum radiative transfer code MCFOST6 and the photo-chemical radiative code ProDiMo7 for the gas emission.
We can provide for the first time consistent estimates of the gas and dust properties. We have calculated a large dedicated grid (DENT grid) for quick comparison and statistical analysis purposes. The gas-to-dust mass ratios range from 0.1 to 1000 and may reflect the large variety of disks. However, the GASPS team has only modelled a handful of objects so far. The modelling of many other
objects as well as statistical studies are ongoing. Time permitting, I will present some of the prospects for future research within GASPS.
GASPS Team
Thi Wing-Fai
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