Gas and Dust Toward DG Tau B and VV CrA

Abstract

We present findings for DG Tau B and VV CrA, two of the objects observed in our Spitzer IRS project to search for molecular absorption in edge-on disks, along with near-IR spectroscopy of the CO fundamental transitions and mid-IR imaging. While the only gas absorption seen in the Spitzer IRS spectrum toward DG Tau B is CO${}_2$, we use gas abundances and gas/ice ratios to argue that we are probing regions of the disk that have low organic molecule abundances. This implies the rarity of detecting molecular absorption toward even edge-on disks with Spitzer IRS is a result of high dependence on the line of sight. We also argue the disk around DG Tau B shows high amounts of grain growth and settling. For VV CrA, we use the silicate absorption feature to estimate a dust extinction, and model the disk with a spectral energy distribution fitting tool to give evidence in support of the disk geometry presented by Smith et al. (2009) where the Primary disk is the main source of extinction toward the infrared companion.

29 pages, 11 figures, 9 tables. Accepted for publication in Astrophysical Journal

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• The chemistry of disks around T Tauri and Herbig Ae/Be stars
• Protostars, multiplicity, and disk evolution in the Corona Australis region: A Herschel Gould Belt Study
• Heterogeneity in ${}^{12}$CO/${}^{13}$CO Ratios Toward Solar-Type Young Stellar Objects
• Exploring organic chemistry in planet-forming zones
• The circumstellar disk of FS Tau B - A self-consistent model based on observations in the mid-infrared with NACO -
• The infrared line-emitting regions of T Tauri protoplanetary disks
• High-Resolution Mid-Infrared Spectroscopy of GV Tau N: Surface Accretion and Detection of Ammonia in a Young Protoplanetary Disk
• S and VV Corona Australis: Spectroscopic Variability in Two Young Binary Star Systems
• Understanding discs in binary YSOs: detailed modelling of VV CrA
• An unusual reservoir of water emission in the VV CrA A protoplanetary disk
• Gas kinematics of key prebiotic molecules in GV Tau N revealed with an ALMA, PdBI, and Herschel synergy
• Gas and Dust Absorption in the DoAr 24E System