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Title: COLD CO GAS IN THE DISK OF THE YOUNG ERUPTIVE STAR EX LUP

EX Lupi-type objects (EXors) form a sub-class of T Tauri stars, defined by sudden sporadic flare-ups of 1–5 mag at optical wavelengths. These eruptions are attributed to enhanced mass accretion from the circumstellar disk to the star, and may constitute important events in shaping the structure of the inner disk and the forming planetary system. Although disk properties must play a fundamental role in driving the outbursts, they are surprisingly poorly known. In order to characterize the dust and gas components of EXor disks, here we report on observations of the {sup 12}CO J = 3−2 and 4–3 lines, and the {sup 13}CO 3–2 line in EX Lup, the prototype of the EXor class. We reproduce the observed line fluxes and profiles with a line radiative transfer model and compare the obtained parameters with corresponding ones of other T Tauri disks.
Authors:
; ;  [1] ; ;  [2] ;  [3] ; ;  [4] ;  [5]
  1. Konkoly Observatory, Research Centre for Astronomy and Earth Sciences, Hungarian Academy of Sciences, P.O. Box 67, 1525 Budapest (Hungary)
  2. Max-Planck-Institut für Radioastronomie, Auf dem Hügel 69, D-53121 Bonn (Germany)
  3. SETI Institute, Mountain View, CA (United States)
  4. Max-Planck-Institut für Astronomie, Königstuhl 17, D-69117 Heidelberg (Germany)
  5. Max-Planck-Institut für Extraterrestrische Physik, D-85741 Garching (Germany)
Publication Date:
OSTI Identifier:
22518492
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal Letters; Journal Volume: 821; 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; CARBON 12; CARBON 13; CARBON MONOXIDE; COMPARATIVE EVALUATIONS; COSMIC DUST; ERUPTION; MASS; RADIANT HEAT TRANSFER; STAR ACCRETION; T TAURI STARS