Deuterium Fractionation Survey Toward Protostellar Sources in the Perseus Molecular Cloud: HNC Case

Muneaki Imai, Nami Sakai, Ana López-Sepulcre, Aya E. Higuchi, Yichen Zhang, Yoko Oya, Yoshimasa Watanabe, Takeshi Sakai, Cecilia Ceccarelli, Bertrand Lefloch, Satoshi Yamamoto

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3 Citations (Scopus)

Abstract

A survey observation of the DNC (J = 1-0 and J = 3-2) and HN13C (J = 1-0 and J = 3-2) emission toward 34 Class 0 and I protostellar sources in the Perseus molecular cloud has been conducted with the NRO 45 m and IRAM 30 m telescopes to explore how the deuterium ratio of the neutral species changes after the birth of a protostar. We have detected the J = 1-0 and J = 3-2 lines of DNC toward 32 sources and the J = 1-0 and J = 3-2 lines of HN13C toward 31 and 26 sources, respectively. A mean deuterium ratio of HNC, which is defined as R D(HNC) = N(DNC)/N(HNC), is found to be 0.049-0.056. We compare R D(HNC) with physical parameters of the sources, and find a negative correlation between R D(HNC) and the bolometric temperature. This result suggests that R D(HNC) decreases as a protostar evolves. Compared with the deuterium ratio of the molecular ion N2H+, RD(HNC) seems to decrease slowly with the protostellar evolution.

Original languageEnglish
Article number51
JournalAstrophysical Journal
Volume869
Issue number1
DOIs
Publication statusPublished - 2018 Dec 10
Externally publishedYes

Keywords

  • ISM: abundances
  • ISM: molecules
  • stars: formation
  • stars: low-mass

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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    Imai, M., Sakai, N., López-Sepulcre, A., Higuchi, A. E., Zhang, Y., Oya, Y., Watanabe, Y., Sakai, T., Ceccarelli, C., Lefloch, B., & Yamamoto, S. (2018). Deuterium Fractionation Survey Toward Protostellar Sources in the Perseus Molecular Cloud: HNC Case. Astrophysical Journal, 869(1), [51]. https://doi.org/10.3847/1538-4357/aaeb21