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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 731913.0, MPI für Astronomie / Publikationen_mpia
Mass measurements in protoplanetary disks from hydrogen deuteride
Authors:McClure, M. K.; Bergin, E. A.; Cleeves, L. I.; van Dishoeck, E. F.; Blake, G. A.; Evans, N. J.; Green, J. D.; Henning, T.; Öberg, K. I.; Pontoppidan, K. M.; Salyk, C.
Date of Publication (YYYY-MM-DD):2016
Title of Journal:The Astrophysical Journal
Issue / Number:2
Start Page:id. 167 (13 pp)
Audience:Not Specified
Abstract / Description:The total gas mass of a protoplanetary disk is a fundamental, but poorly determined, quantity. A new technique has been demonstrated to assess directly the bulk molecular gas reservoir of molecular hydrogen using the HD J = 1–0 line at 112 μm. In this work we present a Herschel Space Observatory 10 survey of six additional T Tauri disks in the HD line. Line emission is detected at >3σ significance in two cases: DM Tau and GM Aur. For the other four disks, we establish upper limits to the line flux. Using detailed disk structure and ray-tracing models, we calculate the temperature structure and dust mass from modeling the observed spectral energy distributions, and we include the effect of UV gas heating to determine the amount of gas required to fit the HD line. The ranges of gas masses are 1.0–4.7 × 10‑2 for DM Tau and 2.5–20.4 × 10‑2 for GM Aur. These values are larger than those found using CO for GM Aur, while the CO-derived gas mass for DM Tau is consistent with the lower end of our mass range. This suggests a CO chemical depletion from the gas phase of up to a factor of five for DM Tau and up to two orders of magnitude for GM Aur. We discuss how future analysis can narrow the mass ranges further.
Free Keywords:astrobiology; protoplanetary disks; radiative transfer
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:ISSN:0004-637X %R 10.3847/0004-637X/831/2/167
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