TY - JOUR
T1 - Laboratory Measurement of Millimeter-wave Transitions of 13CH2DOH for Astronomical Use
AU - Ohno, Yuki
AU - Oyama, Takahiro
AU - Tamanai, Akemi
AU - Zeng, Shaoshan
AU - Watanabe, Yoshimasa
AU - Nakatani, Riouhei
AU - Sakai, Takeshi
AU - Sakai, Nami
N1 - Funding Information:
We thank the anonymous reviewers for invaluable comments. We are grateful to Satoshi Yamamoto for extensive help, suggestions, and discussions. We are also grateful to Takashi Kojima and NAOJ staff for great help with maintaining the SIS receiver installed on the SUMIRE. This study is supported by a Grant-in-Aid from the Ministry of Education, Culture, Sports, Science, and Technology of Japan (18H05222, 20H05845, 20H05844), and a pioneering project in RIKEN (Evolution of Matter in the Universe). This study used distributed software, SPCAT and SPFIT, provided at Jet Propulsion Laboratory in NASA (Pickett ).
Publisher Copyright:
© 2022. The Author(s). Published by the American Astronomical Society.
PY - 2022/6/1
Y1 - 2022/6/1
N2 - Methanol (CH3OH) is an abundant interstellar species and is known to be an important precursor of various interstellar complex organic molecules. Among the methanol isotopologues, CH2DOH is one of the most abundant isotopologues and it is often used to study the deuterium fractionation of CH3OH in interstellar medium. However, the emission lines of CH2DOH can sometimes be optically thick, making the derivation of its abundance unreliable. Therefore, observations of its presumably optically thin 13C substituted species, 13CH2DOH, are essential to overcome this issue. In this study, the rotational transitions of 13CH2DOH have been measured in the millimeter-wave region from 216 GHz to 264 GHz with an emission-type millimeter- and submillimeter-wave spectrometer by using a deuterium and 13C enriched sample. The frequency accuracy of measured 13CH2DOH is less than a few kHz, and the relative line intensity error is less than 10% in most of the frequency range by taking advantage of the wide simultaneous frequency-coverage of the emission-type spectrometer. These results offer a good opportunity to detect 13CH2DOH in space, which will allow us to study the deuterium fractionation of CH3OH in various sources through accurate determination of the CH2DOH abundance.
AB - Methanol (CH3OH) is an abundant interstellar species and is known to be an important precursor of various interstellar complex organic molecules. Among the methanol isotopologues, CH2DOH is one of the most abundant isotopologues and it is often used to study the deuterium fractionation of CH3OH in interstellar medium. However, the emission lines of CH2DOH can sometimes be optically thick, making the derivation of its abundance unreliable. Therefore, observations of its presumably optically thin 13C substituted species, 13CH2DOH, are essential to overcome this issue. In this study, the rotational transitions of 13CH2DOH have been measured in the millimeter-wave region from 216 GHz to 264 GHz with an emission-type millimeter- and submillimeter-wave spectrometer by using a deuterium and 13C enriched sample. The frequency accuracy of measured 13CH2DOH is less than a few kHz, and the relative line intensity error is less than 10% in most of the frequency range by taking advantage of the wide simultaneous frequency-coverage of the emission-type spectrometer. These results offer a good opportunity to detect 13CH2DOH in space, which will allow us to study the deuterium fractionation of CH3OH in various sources through accurate determination of the CH2DOH abundance.
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U2 - 10.3847/1538-4357/ac6b9e
DO - 10.3847/1538-4357/ac6b9e
M3 - Article
AN - SCOPUS:85133510896
SN - 0004-637X
VL - 932
JO - Astrophysical Journal
JF - Astrophysical Journal
IS - 2
M1 - 101
ER -