Gas in the protoplanetary disc of HD 169142: Herschel's view
Journal article, 2010
In an effort to simultaneously study the gas and dust components of the disc surrounding the young Herbig Ae star HD 169142, we present far-IR observations obtained with the PACS instrument onboard the Herschel Space Observatory. This work is part of the open time key program GASPS, which is aimed at studying the evolution of protoplanetary discs. To constrain the gas properties in the outer disc, we observed the star at several key gas-lines, including [OI] 63.2 and 145.5 mu m, [CII] 157.7 mu m, CO 72.8 and 90.2 mu m, and o-H2O 78.7 and 179.5 mu m. We only detect the [OI] 63.2 mu m line in our spectra, and derive upper limits for the other lines. We complement our data set with PACS photometry and (CO)-C-12/13 data obtained with the Submillimeter Array. Furthermore, we derive accurate stellar parameters from optical spectra and UV to mm photometry. We model the dust continuum with the 3D radiative transfer code MCFOST and use this model as an input to analyse the gas lines with the thermo-chemical code ProDIMo. Our dataset is consistent with a simple model in which the gas and dust are well-mixed in a disc with a continuous structure between 20 and 200 AU, but this is not a unique solution. Our modelling effort allows us to constrain the gas-to-dust mass ratio as well as the relative abundance of the PAHs in the disc by simultaneously fitting the lines of several species that originate in different regions. Our results are inconsistent with a gas-poor disc with a large UV excess; a gas mass of 5.0 +/- 2.0 x 10(-3) M-circle dot is still present in this disc, in agreement with earlier CO observations.
radiative-transfer
systems
stars: pre-main sequence
planetary systems
scattering
grains
stars
dust
infrared: planetary systems
spectra
protoplanetary disks
circumstellar matter
continuum
hd-169142
emission
Author
G. Meeus
Universidad Autonoma de Madrid (UAM)
C. Pinte
University of Exeter
Grenoble Alpes University
P. Woitke
University of Edinburgh
Royal Observatory
B. Montesinos
Centro de Astrobiologia (CAB)
I. Mendigutia
Centro de Astrobiologia (CAB)
P. Riviere-Marichalar
Centro de Astrobiologia (CAB)
C. Eiroa
Universidad Autonoma de Madrid (UAM)
G. S. Mathews
University of Hawaii
B. Vandenbussche
KU Leuven
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)
G. Duchene
University of California
Grenoble Alpes University
F. Menard
Grenoble Alpes University
C. A. Grady
National Aeronautics and Space Administration (NASA)
Eureka Scientific
W. R. F. Dent
Atacama Large Millimeter-submillimeter Array (ALMA)
European Southern Observatory Santiago
I. Kamp
University of Groningen
J. C. Augereau
Grenoble Alpes University
W. F. Thi
Grenoble Alpes University
University of Edinburgh
I. Tilling
University of Edinburgh
J. M. Alacid
Centro de Astrobiologia (CAB)
S. Andrews
Harvard-Smithsonian Center for Astrophysics
D. R. Ardila
California Institute of Technology (Caltech)
G. Aresu
University of Groningen
D. Barrado
Centro de Astrobiologia (CAB)
Calar Alto Astronomical Observatory
S. Brittain
Clemson University
D. R. Ciardi
National Aeronautics and Space Administration (NASA)
W. Danchi
National Aeronautics and Space Administration (NASA)
D. Fedele
Johns Hopkins University
Max Planck Society
Universidad Autonoma de Madrid (UAM)
I. de Gregorio-Monsalvo
European Southern Observatory Santiago
Atacama Large Millimeter-submillimeter Array (ALMA)
A. Heras
European Space Research and Technology Centre (ESA ESTEC)
N. Huelamo
Centro de Astrobiologia (CAB)
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
A. Mora
European Space Astronomy Centre (ESAC)
M. Morales-Calderon
Spitzer Science Center
H. Nomura
Kyoto University
E. Pantin
Astrophysique, Instrumentation et Modelisation de Paris-Saclay
I. Pascucci
Johns Hopkins University
N. Phillips
University of Edinburgh
L. Podio
University of Groningen
D. R. Poelman
University of Edinburgh
S. Ramsay
European Southern Observatory (ESO)
B. Riaz
Johns Hopkins University
K. Rice
University of Edinburgh
E. Solano
Centro de Astrobiologia (CAB)
H. Walker
STFC Rutherford Appleton Laboratory
G. J. White
Open University
STFC Rutherford Appleton Laboratory
J. P. Williams
University of Hawaii
G. Wright
Royal Observatory
Astronomy and Astrophysics
0004-6361 (ISSN) 1432-0746 (eISSN)
Vol. 518 Article Number: L124 L124Subject Categories (SSIF 2011)
Astronomy, Astrophysics and Cosmology
DOI
10.1051/0004-6361/201014557