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Complex organic molecules (COMs), which are the seeds of prebiotic materialand precursors of amino acids and sugars, form in the icy mantles ofcircumstellar dust grains but cannot be detected remotely unless they areheated and released to the gas phase. Around solar-mass stars, water and COMsonly sublimate in the inner few au of the disk, making them extremely difficultto spatially resolve and study. Sudden increases in the luminosity of thecentral star will quickly expand the sublimation front (so-called snow line) tolarger radii, as seen previously in the FU Ori outburst of the young star V883Ori. In this paper, we take advantage of the rapid increase in disk temperatureof V883 Ori to detect and analyze five different COMs, methanol, acetone,acetonitrile, acetaldehyde, and methyl formate, in spatially-resolvedsubmillimeter observations. The COMs abundances in V883 Ori is in reasonableagreement with cometary values. This result suggests that outbursting youngstars can provide a special opportunity to study the ice composition ofmaterial directly related to planet formation.

The ice composition in the disk around V883 Ori revealed by its stellar outburst