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 Title: A STUDY OF THE c-C3HD/c-C3H2 RATIO IN LOW-MASS STAR FORMING REGIONS. Author(s): Chantzos, Johanna Contributor(s): Chacon-Tanarro, Ana; Caselli, Paola; Spezzano, Silvia Subject(s): Astronomy Abstract: Deuterium fractionation increases significantly in cold ($T<25$ K), dense ($n_{mathrm{H}}>10^4 , mathrm{cm^{-3}}$) molecular clouds, in which molecules like CO freeze out onto dust grains leading to an enhanced abundance of $mathrm{{H_{2}D^{+}}}$, $mathrm{{D_{2}H^{+}}}$ and $mathrm{{D_{3}^{+}}}$. $c$-$mathrm{C_{3}H_{2}}$ is formed and deuterated exclusively by gas-phase chemistry. This makes it to a very good indicator of gas-phase deuteration and therefore to an excellent tool to study the early phases of star formation. _x000d_ _x000d_ We observed the $c$-$mathrm{C_{3}HD}$/$c$-$mathrm{C_{3}H_{2}}$ ratio toward 13 prestellar and 4 protostellar cores in the Taurus and Perseus Complex, respectively. In particular, the $3_{0,3}-2_{1,2}$ and $2_{1,2}-1_{0,1}$ transitions of the isotopologues $c$-$mathrm{C_{3}HD}$ and $c$-$mathrm{{^{13}CC_{2}H_{2}}}$ were observed in all prestellar and protostellar cores with a very high S/N. In both samples a high deuteration factor was found. In the prestellar cores the $c$-$mathrm{C_{3}HD}$/$c$-$mathrm{C_{3}H_{2}}$ ratio varies between 5% and 13% while in protostellar cores is found to be 9%-23%. _x000d_ _x000d_ I will present our results on the correlation between the deuterium fractionation of $c$-$mathrm{C_{3}H_{2}}$ and evolutionary indicators such as central density and dust temperature and compare them with the deuteration of $mathrm{N_{2}H^{+}}$ observed in the same sources. Issue Date: 6/20/2017 Publisher: International Symposium on Molecular Spectroscopy Citation Info: APS Genre: CONFERENCE PAPER/PRESENTATION Type: Text Language: English URI: http://hdl.handle.net/2142/97185 DOI: 10.15278/isms.2017.TA05 Date Available in IDEALS: 2017-07-272018-01-29
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