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

Journal Article · Sun Apr 10 00:00:00 EDT 2016 · Astrophysical Journal Letters

DOI:https://doi.org/10.3847/2041-8205/821/1/L4· OSTI ID:22518492

Kóspál, Á.; Ábrahám, P.; Moór, A. ^[1]; Csengeri, T.; Güsten, R. ^[2]; Gorti, U. ^[3]; Henning, Th.; Semenov, D. A. ^[4]

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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)

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.

• OSTI ID: 22518492
• Journal Information: Astrophysical Journal Letters, Vol. 821, Issue 1; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 2041-8205
• Country of Publication: United States
• Language: English

Related Subjects

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