Year: 2010
Type: article
Abstract: 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 μm, [CII] 157.7 μm, CO 72.8 and 90.2 μm, and o-H2O 78.7 and 179.5 μm. We only detect the [OI] 63.2 μm line in our spectra, and derive upper limits for the other lines. We complement our data set with PACS photometry and 12/13CO 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 × 10-3 is still present in this disc, in agreement with earlier CO observations.
Source: Astronomy and Astrophysics
Authors: G. Meeus, C. Pinte, P. Woitke, B. Montesinos, I. Mendigutía, P. Riviere-Marichalar, C. Eiroa, G. S. Mathews, B. Vandenbussche, C. D. Howard, A. Roberge, G. Sandell, G. Duchêne, F. Ménard, C. A. Grady, W. R. F. Dent, I. Kamp, J. C. Augereau, W. F. Thi, I. Tilling, J. M. Alacid, S. Andrews, D. R. Ardila, G. Aresu, D. Barrado, 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, A. Mora, M. Morales-Calderon, H. Nomura, E. Pantin, I. Pascucci, N. Phillips, L. Podio, D. R. Poelman, S. Ramsay, B. Riaz, K. Rice, E. Solano, H. Walker, G. J. White, J. P. Williams, G. Wright
Institutions: Centre National de la Recherche Scientifique, Universidad Autónoma de Madrid, Université Joseph Fourier, University of Exeter, Institut de Planétologie et d'Astrophysique de Grenoble, University of St Andrews, Royal Observatory, UK Astronomy Technology Centre, University of Edinburgh, Consejo Superior de Investigaciones Científicas, Centro de Astrobiología, University of Hawaiʻi at Mānoa, University of Hawaii System, KU Leuven, Ames Research Center, Goddard Space Flight Center, University of California, Berkeley, Eureka Scientific, Atacama Large Millimeter Submillimeter Array, European Southern Observatory, University of Groningen, Harvard University, Center for Astrophysics Harvard & Smithsonian, California Institute of Technology, Calar Alto Observatory, Clemson University, NASA Exoplanet Science Institute, Johns Hopkins University, Max Planck Institute for Astronomy, European Space Research and Technology Centre, Friedrich Schiller University Jena, Chalmers University of Technology, European Space Astronomy Centre, Kyoto University, Commissariat à l'Énergie Atomique et aux Énergies Alternatives, Astrophysique, Instrumentation et Modélisation, Institut de Recherche sur les Lois Fondamentales de l'Univers, European Southern Observatory, Rutherford Appleton Laboratory, The Open University
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: bronze
Funders: National Aeronautics and Space Administration, European Commission, Agence Nationale de la Recherche, Centre National d’Etudes Spatiales, Bundesministerium für Verkehr, Innovation und Technologie, Max-Planck-Institut für Astronomie, Science and Technology Facilities Council, Centro de Instrumentación Científico-Técnica, Universidad de Jaén
OpenAlex ID: W2140605402