Spectral Evolution and Radial Dust Transport in the Prototype Young Eruptive System EX Lup

Ábrahám, Péter and Chen, Lei and Kóspál, Ágnes and Bouwman, J. and Carmona, A. and Varga, József (2019) Spectral Evolution and Radial Dust Transport in the Prototype Young Eruptive System EX Lup. ASTROPHYSICAL JOURNAL, 887 (2). ISSN 1538-4357

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Abstract

EX Lup is the prototype of a class of pre-main-sequence eruptive stars defined by their repetitive outbursts lasting several months. In 200 January─September EX Lup underwent its historically largest outburst brightening by about 4 mag in visual light. In previous studies w discovered ongoing silicate crystal formation in the inner disk durin the outburst, but also noticed that the measured crystallinity fractio started decreasing after the source returned to the quiescent phase Here we present new observations of the 10 μm silicate feature, obtaine with the MIDI and VISIR instruments at Paranal Observatory. Th observations demonstrate that within five years practically al crystalline forsterite disappeared from the surface of the inner disk We reconstruct this process by presenting a series of parametri axisymmetric radiative transfer models of an expanding dust cloud tha transports the crystals from the terrestrial zone to outer disk region where comets are supposed to form. It is possible the early Sun als experienced similar flare-ups, and the forming planetesimals might hav incorporated crystalline silicate material produced by such outbursts Finally, we discuss how far the location of the dust cloud could b constrained by future James Webb Space Telescope observations. Based on observations collected at the European Organisation fo Astronomical Research in the Southern Hemisphere under ESO programme 091.C-0668 and 097.C-0639

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