Cold CO gas in the disk of the young eruptive star EX Lup

Abstract

EX Lupi-type objects (EXors) form a sub-class of T Tauri stars, defined by sudden sporadic flare-ups of 1-5 magnitudes 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 ${}^{12}$CO J=3-2 and 4-3 lines, and the ${}^{13}$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.

arXiv commentAccepted for publication in the ApJL. 16 pages in manuscript format, 2 figure, 1 table

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Cited by in corpus (6)

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• The ALMA Early Science view of FUor/EXor objects. I. Through the looking-glass of V2775 Ori
• A concordant scenario to explain FU Ori from deep centimeter and millimeter interferometric observations
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