4-8 October 2015
Hans Harnack Haus
Europe/Berlin timezone
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Contribution Poster

Poster session

The deuteration of linear and cyclic C$_3$H$_2$

Speakers

  • Dr. Silvia SPEZZANO

Primary authors

Co-authors

Content

The cyclic C$_3$H$_2$ is the most stable isomer of the C$_3$H$_2$ system. It has been detected in space 30 years ago together with its singly deuterated isotopologue, $c$-C$_3$HD (Thaddeus et al., 1985 and Bell et al., 1988). The doubly deuterated $c$-C$_3$H$_2$, $c$-C$_3$D$_2$, was detected very recently in space for the first time, in L1544 and TMC-1C (Spezzano et al., 2013), and in L1527 (Tokudome et al., 2013), short after its first detection in the laboratory (Spezzano et al., 2012). The linear isomer H$_2$CCC is 14 kcal mol$^{-1}$ higher in energy than $c$-C$_3$H$_2$. Its abundance ratio with respect to the cyclic ranges from 1/30 to 1/4, depending on the astrophysical environment. We recently detected for the first time in space HDCCC, the singly deuterated isotopologue (Spezzano et al., submitted). A comparison of the deuterium fractionation in the two isomers, and the importance of high resolution laboratory spectroscopy data will be presented.

References:

  • Bell, M.B., Avery, L.W., Matthews, H.E., et al., 1988, ApJ, 326, 924
  • Spezzano, S., Tamassia, F., Thorwirth, S., et al. 2012, ApJ Supp. Series, 200, 1
  • Spezzano, S., Brünken, S., Schilke, P., et al. 2013, ApJL, 769, L19
  • Thaddeus, P., Vrtilek, J.M., and Gottlieb, C.A. 1985, ApJL 299, L63
  • Tokudome, T., Sakai, N., Sakai, T., et al. 2013, New Trends in Radio Astronomy in the ALMA Era: The 30th Anniversary of Nobeyama Radio Observatory, 476, 355