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Title: HERSCHEL/PACS SURVEY OF PROTOPLANETARY DISKS IN TAURUS/AURIGA—OBSERVATIONS OF [O I] AND [C II], AND FAR-INFRARED CONTINUUM

The Herschel Space Observatory was used to observe ∼120 pre-main-sequence stars in Taurus as part of the GASPS Open Time Key project. Photodetector Array Camera and Spectrometer was used to measure the continuum as well as several gas tracers such as [O I] 63 μm, [O I] 145 μm, [C II] 158 μm, OH, H{sub 2}O, and CO. The strongest line seen is [O I] at 63 μm. We find a clear correlation between the strength of the [O I] 63 μm line and the 63 μm continuum for disk sources. In outflow sources, the line emission can be up to 20 times stronger than in disk sources, suggesting that the line emission is dominated by the outflow. The tight correlation seen for disk sources suggests that the emission arises from the inner disk (<50 AU) and lower surface layers of the disk where the gas and dust are coupled. The [O I] 63 μm is fainter in transitional stars than in normal Class II disks. Simple spectral energy distribution models indicate that the dust responsible for the continuum emission is colder in these disks, leading to weaker line emission. [C II] 158 μm emission is only detected in strongmore » outflow sources. The observed line ratios of [O I] 63 μm to [O I] 145 μm are in the regime where we are insensitive to the gas-to-dust ratio, neither can we discriminate between shock or photodissociation region emission. We detect no Class III object in [O I] 63 μm and only three in continuum, at least one of which is a candidate debris disk.« less
Authors:
; ;  [1] ;  [2] ;  [3] ; ; ; ; ;  [4] ; ;  [5] ;  [6] ; ;  [7] ; ;  [8] ; ;  [9] ;  [10]
  1. SOFIA-USRA, NASA Ames Research Center, MS 232-12, Building N232, Rm. 146, P.O. Box 1, Moffett Field, CA 94035-0001 (United States)
  2. Astronomy Department, University of California, Berkeley, CA 94720-3411 (United States)
  3. Leiden Observatory, Leiden University, P.O. Box 9513, 2300 RA Leiden (Netherlands)
  4. UJF-Grenoble 1/CNRS-INSU, Institut de Planétologie et d'Astrophysique (IPAG) UMR 5274, F-38041 Grenoble (France)
  5. Centro de Astrobiología, Depto. Astrofísica (CSIC/INTA), ESAC Campus, P.O. Box 78, E-28691 Villanueva de la Cañada (Spain)
  6. ALMA SCO, Alonso de Córdova 3107, Vitacura, Santiago (Chile)
  7. Dep. de Física Teórica, Fac. de Ciencias, UAM Campus Cantoblanco, E-28049 Madrid (Spain)
  8. Exoplanets and Stellar Astrophysics Laboratory, NASA Goddard Space Flight Center, Code 667, Greenbelt, MD 20771 (United States)
  9. Kapteyn Astronomical Institute, Postbus 800, 9700 AV Groningen (Netherlands)
  10. Institute for Astronomy (IfA), University of Hawaii, 2680 Woodlawn Drive, Honolulu, HI 96822 (United States)
Publication Date:
OSTI Identifier:
22270899
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 776; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; ASTRONOMY; ASTROPHYSICS; CAMERAS; CARBON IONS; CARBON MONOXIDE; DISSOCIATION; ENERGY SPECTRA; LAYERS; MAIN SEQUENCE STARS; OXYGEN IONS; PHOTODETECTORS; PHOTOLYSIS; PROTOPLANETS; WATER