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Herschel - PACS Survey Of Protoplanetary Disks In Taurus - Auriga Observations Of [O I] And [C Ii], And Far-Infrared ContinuumThe Herschel Space Observatory was used to observe approx. 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 micron, [O I] 145 micron, [C II] 158, micron OH, H2O, and CO. The strongest line seen is [O I] at 63 micron. We find a clear correlation between the strength of the [O I] 63 micron line and the 63 micron 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 micron 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 micron emission is only detected in strong outflow sources. The observed line ratios of [O I] 63 micron to [O I] 145 micron 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 micron and only three in continuum, at least one of which is a candidate debris disk.
Document ID
20140013338
Acquisition Source
Goddard Space Flight Center
Document Type
Reprint (Version printed in journal)
External Source(s)
doi:10.1088/0004-637X/776/1/21
Authors
Howard, Christian (Universities Space Research Association Moffett Field, CA, United States)
Sandell, Goeran (Universities Space Research Association Moffett Field, CA, United States)
Vacca, William D. (Universities Space Research Association Moffett Field, CA, United States)
Duchene, Gaspard (California Univ. Berkeley, CA, United States)
Matthews, Geoffrey (Leiden Univ. Netherlands)
Augereau, Jean-Charles (Grenoble-1 Univ. France)
Barbado, David (European Space Astronomy Centre (ESAC) Villanueva de la Canada)
Dent, William R. F. (European Southern Observatory Santiago, Chile)
Eiroa, Carlos (Universidad Autonoma de Madrid Cantoblanco, Spain)
Grady, Carol (Eureka Scientific, Inc. Oakland, CA, United States)
Kamp, Inga (Kapteyn Astronomical Lab. Groningen, Netherlands)
Meeus, Gwendolyn (Universidad Autonoma de Madrid Cantoblanco, Spain)
Menard, Francois (Grenoble-1 Univ. France)
Pinte, Christophe (Grenoble-1 Univ. France)
Podio, Linda (Grenoble-1 Univ. France)
Riviere-Marichalar, Pablo (European Space Astronomy Centre (ESAC) Villanueva de la Canada)
Roberge, Aki (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Thi,, Wing-Fai (Grenoble-1 Univ. France)
Vicente, Silvia (Kapteyn Astronomical Lab. Groningen, Netherlands)
Williams, Jonathan P. (Hawaii Univ. Honolulu, HI, United States)
Date Acquired
November 5, 2014
Publication Date
September 20, 2013
Publication Information
Publication: The Astrophysical Journal
Publisher: American Astronomical Society
Volume: 776
Issue: 1
Subject Category
Astrophysics
Report/Patent Number
GSFC-E-DAA-TN12448
Funding Number(s)
CONTRACT_GRANT: NNG12PP44P
CONTRACT_GRANT: 284405
Distribution Limits
Public
Copyright
Public Use Permitted.
Keywords
GASPS Open Time Key project
Photodetector Array Camera and Spectrometer
transitional stars

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