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Title: PROBING THE GASEOUS DISK OF T Tau N WITH CN 5-4 LINES

We present spectrally resolved observations of the young multiple system T Tau in atomic and molecular lines obtained with the Heterodyne Instrument for the Far Infrared on board Herschel. While CO, H{sub 2}O, [C II], and SO lines trace the envelope and the outflowing gas up to velocities of 33 km s{sup –1} with respect to systemic, the CN 5-4 hyperfine structure lines at 566.7, 566.9 GHz show a narrow double-peaked profile centered at systemic velocity, consistent with an origin in the outer region of the compact disk of T Tau N. Disk modeling of the T Tau N disk with the thermo-chemical code ProDiMo produces CN line fluxes and profiles consistent with the observed ones and constrain the size of the gaseous disk (R{sub out}=110{sub −20}{sup +10} AU) and its inclination (i = 25°± 5°). The model indicates that the CN lines originate in a disk upper layer at 40-110 AU from the star, which is irradiated by the stellar UV field and heated up to temperatures of 50-700 K. With respect to previously observed CN 2-1 millimeter lines, the CN 5-4 lines appear to be less affected by envelope emission, due to their larger critical density and excitation temperature. Hence, high-J CN lines are a uniquemore » confusion-free tracer of embedded disks, such as the disk of T Tau N.« less
Authors:
;  [1] ; ; ;  [2] ;  [3] ;  [4] ;  [5] ; ; ;  [6] ;  [7] ;  [8] ;  [9] ;  [10]
  1. INAF-Osservatorio Astrofisico di Arcetri, Largo E. Fermi 5, I-50125, Florence (Italy)
  2. Kapteyn Astronomical Institute, University of Groningen, Landleven 12, 9747 AD Groningen (Netherlands)
  3. INAF-Osservatorio Astronomico di Roma, via di Frascati 33, I-00040, Monte Porzio Catone (Italy)
  4. INAF-Osservatorio Astronomico di Cagliari, Via della Scienza 5, I-09047, Selargius (Italy)
  5. Department of Physics and Astronomy, 118 Kinard Laboratory, Clemson University, Clemson, SC 29634 (United States)
  6. UJF-Grenoble 1/CNRS-INSU, Institut de Planétologie et d'Astrophysique de Grenoble (IPAG) UMR 5274, Grenoble, F-38041 (France)
  7. Eureka Scientific, 2452 Delmer, Suite 100, Oakland, CA 96002 (United States)
  8. SOFIA-USRA, NASA Ames Research Center, MS 232-12, Building N232, Rm. 146, P.O. Box 1, Moffett Field, CA 94035-0001 (United States)
  9. Department of Physical Sciences, The Open University, Milton Keynes, MK7 6AA (United Kingdom)
  10. SUPA, School of Physics and Astronomy, University of St. Andrews, KY16 9SS (United Kingdom)
Publication Date:
OSTI Identifier:
22365987
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal Letters; Journal Volume: 783; Journal Issue: 2; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; BINARY STARS; CARBON MONOXIDE; CARBON NITRIDES; COMPUTERIZED SIMULATION; DENSITY; EXCITATION; GHZ RANGE; INCLINATION; IRRADIATION; LAYERS; MOLECULES; P CODES; PROBES; PROTOPLANETS; SULFUR IONS; VELOCITY; WATER