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

Thi, W.-F. and Ardila, D. R. and Ciardi, D. R. (2010) Herschel-PACS observation of the 10 Myr old T Tauri disk TW Hya: Constraining the disk gas mass. Astronomy and Astrophysics, 518 . Art. No. L125. ISSN 0004-6361.

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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.

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Ciardi, D. R.0000-0002-5741-3047
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 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.
Group:Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
Scottish Universities Physics AllianceUNSPECIFIED
Ministerio de Ciencia e Innovación (MICINN) AYA 2008-01727
Marie Curie FellowshipPIEF-GA-2008-220891
NASA/JPLAYA 2008-02156
Programme National de Physique Stellaire (PNPS)UNSPECIFIED
Centre National d'Études Spatiales (CNES)UNSPECIFIED
Agence Nationale pour la Recherche (ANR)UNSPECIFIED
Subject Keywords:circumstellar disks
Record Number:CaltechAUTHORS:20101203-105353090
Persistent URL:
Official Citation:Herschel-PACS observation of the 10 Myr old T Tauri disk TW Hya - Constraining the disk gas mass W.-F. Thi, G. Mathews, F. Ménard, P. Woitke, G. Meeus, P. Riviere-Marichalar, C. Pinte, C. D. Howard, A. Roberge, G. Sandell, I. Pascucci, B. Riaz, C. A. Grady, W. R. F. Dent, I. Kamp, G. Duchêne, J.-C. Augereau, E. Pantin, B. Vandenbussche, I. Tilling, J. P. Williams, C. Eiroa, D. Barrado, J. M. Alacid, S. Andrews, D. R. Ardila, G. Aresu, S. Brittain, D. R. Ciardi, W. Danchi, D. Fedele, I. de Gregorio-Monsalvo, A. Heras, N. Huelamo, A. Krivov, J. Lebreton, R. Liseau, C. Martin-Zaidi, I. Mendigutía, B. Montesinos, A. Mora, M. Morales-Calderon, H. Nomura, N. Phillips, L. Podio, D. R. Poelman, S. Ramsay, K. Rice, E. Solano, H. Walker, G. J. White and G. Wright A&A 518 L125 (2010) DOI: 10.1051/0004-6361/201014578
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:21150
Deposited By: Benjamin Perez
Deposited On:03 Dec 2010 21:08
Last Modified:28 Mar 2017 22:22

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