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Herschel-PACS observation of the 10 Myr old T Tauri disk TW Hya

Thi, W.-F.; Mathews, G.; Ménard, F.; Woitke, P.; Meeus, G.; Riviere-Marichalar, P.; Pinte, C.; Howard, C. D.; Roberge, A.; Sandell, G.; Pascucci, I.; Riaz, B.; Grady, C. A.; Dent, W. R. F.; Kamp, I.; Duchêne, G.; Augereau, J.-C.; Pantin, E.; Vandenbussche, B.; Tilling, I.; Williams, J. P.; Eiroa, C.; Barrado, D.; Alacid, J. M.; Andrews, S.; Ardila, D. R.; Aresu, G.; Brittain, S.; Ciardi, D. R.; Danchi, W.; Fedele, D.; de Gregorio-Monsalvo, I.; Heras, A.; Huelamo, N.; Krivov, A.; Lebreton, J.; Liseau, R.; Martin-Zaidi, C.; Mendigutía, I.; Montesinos, B.; Mora, A.; Morales-Calderon, M.; Nomura, H.; Phillips, N.; Podio, L.; Poelman, D. R.; Ramsay, S.; Rice, K.; Solano, E.; Walker, H.; White, G. J. and Wright, G. (2010). Herschel-PACS observation of the 10 Myr old T Tauri disk TW Hya. Astronomy & Astrophysics, 518, article no. L125.

DOI (Digital Object Identifier) Link: http://dx.doi.org/10.1051/0004-6361/201014578
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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 TW Hya disk, making TW Hya 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 12CO 3–2 and 13CO 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 [12CO] /[13CO] = 69 suggests a dust mass for grains with radius <1 mm of ~1.9 × 10-4 Mʘ (total solid mass of 3 × 10-3 Mʘ) and a gas mass of (0.5–5) × 10-3 Mʘ. The gas-to-dust mass may be lower than the standard interstellar value of 100.

Item Type: Journal Article
Copyright Holders: 2010 ESO
ISSN: 1432-0746
Extra Information: 6 pp.
Keywords: circumstellar disks
Academic Unit/Department: Science > Physical Sciences
Interdisciplinary Research Centre: Centre for Earth, Planetary, Space and Astronomical Research (CEPSAR)
Item ID: 25085
Depositing User: Ann McAloon
Date Deposited: 03 Dec 2010 10:16
Last Modified: 01 Aug 2014 09:32
URI: http://oro.open.ac.uk/id/eprint/25085
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