Discovery of a Hot Corino in the Bok Globule B335

Abstract

We report the first evidence of a hot corino in a Bok globule. This is based on the ALMA observations in the 1.2 mm band toward the low-mass Class 0 protostar IRAS 19347+0727 in B335. Saturated complex organic molecules (COMs), CH${}_3$CHO, HCOOCH${}_3$, and NH${}_2$CHO, are detected in a compact region within a few 10 au around the protostar. Additionally, CH${}_3$OCH${}_3$, C${}_2$H${}_5$OH, C${}_2$H${}_5$CN, and CH${}_3$COCH${}_3$ are tentatively detected. Carbon-chain related molecules, CCH and c-C${}_3$H${}_2$, are also found in this source, whose distributions are extended over a few 100 au scale. On the other hand, sulfur-bearing molecules CS, SO, and SO${}_2$, have both compact and extended components. Fractional abundances of the COMs relative to H${}_2$ are found to be comparable to those in known hot-corino sources. Though the COMs lines are as broad as 5-8 km s${}^{-1}$, they do not show obvious rotation motion in the present observation. Thus, the COMs mainly exist in a structure whose distribution is much smaller than the synthesized beam (0."58 x 0."52).

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