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A study of the C$_3$H$_2$ isomers and isotopologues: first interstellar detection of HDCCC | | S. Spezzano
; H. Gupta
; S. Brünken
; C. A. Gottlieb
; P. Caselli
; K. M. Menten
; H. S. P. Müller
; L. Bizzocchi
; P. Schilke
; M. C. McCarthy
; S. Schlemmer
; | | Date: |
16 Nov 2015 | | Abstract: | The partially deuterated linear isomer HDCCC of the ubiquitous cyclic carbene
($c$-C$_3$H$_2$) was observed in the starless cores TMC-1C and L1544 at 96.9
GHz, and a confirming line was observed in TMC-1 at 19.38 GHz. To aid the
identification in these narrow line sources, four centimetre-wave rotational
transitions (two in the previously reported $K_a =0$ ladder, and two new ones
in the $K_a =1$ ladder), and 23 transitions in the millimetre band between 96
and 272 GHz were measured in high-resolution laboratory spectra. Nine
spectroscopic constants in a standard asymmetric top Hamiltonian allow the
principal transitions of astronomical interest in the $K_a le 3$ rotational
ladders to be calculated to within 0.1 km s$^{-1}$ in radial velocity up to 400
GHz. Conclusive evidence for the identification of the two astronomical lines
of HDCCC was provided by the $V_{
m{LSR}}$ which is the same as that of the
normal isotopic species (H$_2$CCC) in the three narrow line sources. In these
sources, deuterium fractionation in singly substituted H$_2$CCC (HDCCC/H$_2$CCC
$sim4\% ext{-}19\%$) is comparable to that in $c$-C$_3$H$_2$
($c$-C$_3$H$_2$/$c$-C$_3$HD $sim5\% ext{-}17\%$), and similarly in doubly
deuterated $c$-C$_3$H$_2$ ($c$-C$_3$D$_2$/$c$-C$_3$HD $sim3\% ext{-}17\%$),
implying that the efficiency of the deuteration processes in the H$_2$CCC and
$c$-C$_3$H$_2$ isomers are comparable in dark clouds. | | Source: | arXiv, 1511.4878 | | Services: | Forum | Review | PDF | Favorites | |
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