FAUST I. The hot corino at the heart of the prototypical Class I protostar L1551 IRS5 - Archive ouverte HAL
Journal Articles Monthly Notices of the Royal Astronomical Society: Letters Year : 2020

FAUST I. The hot corino at the heart of the prototypical Class I protostar L1551 IRS5

Abstract

The study of hot corinos in Solar-like protostars has been so far mostly limited to the Class 0 phase, hampering our understanding of their origin and evolution. In addition, recent evidence suggests that planet formation starts already during Class I phase, which, therefore, represents a crucial step in the future planetary system chemical composition. Hence, the study of hot corinos in Class I protostars has become of paramount importance. Here we report the discovery of a hot corino towards the prototypical Class I protostar L1551 IRS5, obtained within the ALMA Large Program FAUST. We detected several lines from methanol and its isopo-tologues (13 CH 3 OH and CH 2 DOH), methyl formate and ethanol. Lines are bright toward the north component of the IRS5 binary system, and a possible second hot corino may be associated with the south component. The methanol lines non-LTE analysis constrains the gas temperature (∼100 K), density (≥1.5×10 8 cm −3), and emitting size (∼10 au in radius). All CH 3 OH and 13 CH 3 OH lines are optically thick, preventing a reliable measure of the deutera-tion. The methyl formate and ethanol relative abundances are compatible with those measured in Class 0 hot corinos. Thus, based on the present work, little chemical evolution from Class 0 to I hot corinos occurs.
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Dates and versions

hal-02999416 , version 1 (10-11-2020)

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E. Bianchi, C. J. J Chandler, C. Ceccarelli, C. Codella, N. Sakai, et al.. FAUST I. The hot corino at the heart of the prototypical Class I protostar L1551 IRS5. Monthly Notices of the Royal Astronomical Society: Letters, 2020, 498 (1), pp.L87-L92. ⟨10.1093/mnrasl/slaa130⟩. ⟨hal-02999416⟩
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