Herschel-PACS observation of the 10 Myr old T Tauri disk TW Hya Constraining the disk gas mass
Journal article, 2010
Planets are formed in disks around young stars. With an age of similar to 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 [OI] and [CII] as part of the open-time large program GASPS. We complement this with continuum data and ground-based (12) CO 3-2 and (CO)-C-13 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 [OI] line at 63 mu m. The other lines that were observed, [OI] at 145 mu m and [CII] at 157 mu m, are not detected. No extended emission has been found. Preliminary modeling of the photometric and line data assuming [(CO)-C-12]/[(CO)-C-13] = 69 suggests a dust mass for grains with radius < 1 mm of similar to 1.9 x 10(-4) M-circle dot (total solid mass of 3 x 10(-3) M-circle dot) and a gas mass of (0.5-5) x 10(-3) M-circle dot. The gas-to-dust mass may be lower than the standard interstellar value of 100.
models
young stars
hydrae
emission
x-ray
main-sequence stars
circumstellar disks
array
spectra
protoplanetary disks
Author
W. F. Thi
Grenoble Alpes University
University of Edinburgh
G. Mathews
University of Hawaii
F. Menard
Grenoble Alpes University
P. Woitke
University of Edinburgh
University of St Andrews
Royal Observatory
G. Meeus
Universidad Autonoma de Madrid (UAM)
P. Riviere-Marichalar
Centro de Astrobiologia (CAB)
C. Pinte
University of Exeter
Grenoble Alpes University
C. D. Howard
National Aeronautics and Space Administration (NASA)
A. Roberge
National Aeronautics and Space Administration (NASA)
G. Sandell
National Aeronautics and Space Administration (NASA)
I. Pascucci
Space Telescope Science Institute (STScI)
B. Riaz
Space Telescope Science Institute (STScI)
C. A. Grady
National Aeronautics and Space Administration (NASA)
W. R. F. Dent
Atacama Large Millimeter-submillimeter Array (ALMA)
I. Kamp
University of Groningen
G. Duchene
University of California
Grenoble Alpes University
J. C. Augereau
Grenoble Alpes University
E. Pantin
Institut de Recherche sur les Lois Fondamentales de l'Univers
B. Vandenbussche
KU Leuven
I. Tilling
University of Edinburgh
J. P. Williams
University of Hawaii
C. Eiroa
Universidad Autonoma de Madrid (UAM)
D. Barrado
Centro de Astrobiologia (CAB)
Calar Alto Astronomical Observatory
J. M. Alacid
Centro de Astrobiologia (CAB)
Spanish Virtual Observatory
S. Andrews
Harvard-Smithsonian Center for Astrophysics
D. R. Ardila
California Institute of Technology (Caltech)
G. Aresu
University of Groningen
S. Brittain
Clemson University
D. R. Ciardi
National Aeronautics and Space Administration (NASA)
W. Danchi
National Aeronautics and Space Administration (NASA)
D. Fedele
Max Planck Society
Universidad Autonoma de Madrid (UAM)
Johns Hopkins University
I. de Gregorio-Monsalvo
Atacama Large Millimeter-submillimeter Array (ALMA)
A. Heras
European Space Research and Technology Centre (ESA ESTEC)
N. Huelamo
Royal Observatory
A. Krivov
Friedrich Schiller University Jena
J. Lebreton
Grenoble Alpes University
René Liseau
Chalmers, Earth and Space Sciences, Radio Astronomy and Astrophysics
C. Martin-Zaidi
Grenoble Alpes University
I. Mendigutia
Royal Observatory
B. Montesinos
Royal Observatory
M. Morales-Calderon
European Space Astronomy Centre (ESAC)
H. Nomura
Kyoto University
N. Phillips
University of Edinburgh
L. Podio
University of Groningen
D. R. Poelman
University of St Andrews
S. Ramsay
European Southern Observatory (ESO)
K. Rice
University of Edinburgh
E. Solano
Spanish Virtual Observatory
Centro de Astrobiologia (CAB)
H. Walker
STFC Rutherford Appleton Laboratory
G. J. White
STFC Rutherford Appleton Laboratory
Open University
G. Wright
Royal Observatory
Astronomy and Astrophysics
0004-6361 (ISSN) 1432-0746 (eISSN)
Vol. 518 Article Number: L125 L125Subject Categories (SSIF 2011)
Astronomy, Astrophysics and Cosmology
DOI
10.1051/0004-6361/201014578