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

doi:10.3847/1538-4357/aaeb21

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

Research output: Contribution to journal › Article

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⁺, R_D(HNC) seems to decrease slowly with the protostellar evolution.

Original language	English
Article number	51
Journal	Astrophysical Journal
Volume	869
Issue number	1
DOIs	https://doi.org/10.3847/1538-4357/aaeb21
Publication status	Published - 2018 Dec 10
Externally published	Yes

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

Deuterium Fractionation Survey Toward Protostellar Sources in the Perseus Molecular Cloud : HNC Case. / Imai, Muneaki; Sakai, Nami; López-Sepulcre, Ana; Higuchi, Aya E.; Zhang, Yichen; Oya, Yoko; Watanabe, Yoshimasa; Sakai, Takeshi; Ceccarelli, Cecilia; Lefloch, Bertrand; Yamamoto, Satoshi.

In: Astrophysical Journal, Vol. 869, No. 1, 51, 10.12.2018.

Research output: Contribution to journal › Article

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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.",

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author = "Muneaki Imai and Nami Sakai and Ana L{\'o}pez-Sepulcre and Higuchi, {Aya E.} and Yichen Zhang and Yoko Oya and Yoshimasa Watanabe and Takeshi Sakai and Cecilia Ceccarelli and Bertrand Lefloch and Satoshi Yamamoto",

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AU - Watanabe, Yoshimasa

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AU - Ceccarelli, Cecilia

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AU - Yamamoto, Satoshi

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