Cold CO Gas in the Disk of the Young Eruptive Star EX Lup

Kóspál, Ágnes and Ábrahám, Péter and Csengeri, Tímea and Gorti, U. and Henning, Th. and Moór, Attila (2016) Cold CO Gas in the Disk of the Young Eruptive Star EX Lup. ASTROPHYSICAL JOURNAL LETTERS, 821 (1). ISSN 2041-8205

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Abstract

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 ¹²CO J = 3‑2 and 4–3 lines, and the ¹³CO 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.

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