Welcome to the new version of CaltechAUTHORS. Login is currently restricted to library staff. If you notice any issues, please email coda@library.caltech.edu
Published July 2010 | Published
Journal Article Open

Herschel-PACS observation of the 10 Myr old T Tauri disk TW Hya: Constraining the disk gas mass

Abstract

Planets are formed in disks around young stars. With an age of ~10 Myr, TW Hya is one of the nearest T Tauri stars that is still surrounded by a relatively massive disk. In addition a large number of molecules has been found in the TWHya disk, making TWHya the perfect test case in a large survey of disks with Herschel–PACS to directly study their gaseous component. We aim to constrain the gas and dust mass of the circumstellar disk around TW Hya. We observed the fine-structure lines of [O_I] and [C_(II)] as part of the open-time large program GASPS. We complement this with continuum data and ground-based ^(12)CO 3–2 and ^(13)CO 3–2 observations. We simultaneously model the continuum and the line fluxes with the 3D Monte-Carlo code MCFOST and the thermo-chemical code ProDiMo to derive the gas and dust masses. We detect the [O_I] line at 63 μm. The other lines that were observed, [O_I] at 145 μm and [C_(II)] at 157 μm, are not detected. No extended emission has been found. Preliminary modeling of the photometric and line data assuming [^(12)CO]/[^(13)CO] = 69 suggests a dust mass for grains with radius <1 mm of ~1.9 × 10^(−4) M_⊙ (total solid mass of 3 × 10^(−3) M_⊙) and a gas mass of (0.5–5) ×10^(−3) M_⊙. The gas-to-dust mass may be lower than the standard interstellar value of 100.

Additional Information

© 2010 ESO. Received 30 March 2010, Accepted 28 April 2010, Published online 16 July 2010. Herschel is an ESA space observatory with science instruments provided by Principal Investigator consortia. It is open for proposals for observing time from the worldwide astronomical community. Appendix is only available in electronic form at http://www.aanda.org. W.-F. Thi acknowledges a SUPA astrobiology fellowship. G. Meeus, C. Eiroa, J. Maldonado and B. Montesinos are partly supported by Spanish grant AYA 2008-01727. C. Pinte acknowledges the funding from the EC 7th Framework Program as aMarie Curie Intra-European Fellow (PIEF-GA-2008-220891). D.R. Ardila, S.D. Brittain, C.A. Grady, I. Pascucci, B. Riaz, G. Sandell and C.D. Howards, J.-P.Williams, G.Matthews, A. Roberge, W. Danchi acknowledge NASA/JPL for funding support. E. Solano and J.M. Alacid acknowledge the funding from the Spanish MICINN through grant AYA2008- 02156. The LAOG group acknowledges PNPS, CNES and ANR (contract ANR-07-BLAN-0221) for financial support.

Attached Files

Published - Thi2010p11916Astron_Astrophys.pdf

Files

Thi2010p11916Astron_Astrophys.pdf
Files (261.8 kB)
Name Size Download all
md5:b4bcdd1d34d6aebd1f040771dbde9c2f
261.8 kB Preview Download

Additional details

Created:
August 19, 2023
Modified:
October 20, 2023