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The low-mass protostellar region L1527 is unusual because it containsobservable abundances of unsaturated carbon-chain molecules including CnHradicals, H2Cn carbenes, cyanopolyynes, and the negative ions C4H- and C6H-,all of which are more associated with cold cores than with protostellarregions. Sakai et al. suggested that these molecules are formed in L1527 fromthe chemical precursor methane, which evaporates from the grains during theheat-up of the region. With the gas-phase osu.03.2008 network extended toinclude negative ions of the families Cn-, and CnH-, as well as the newlydetected C3N-, we modeled the chemistry that occurs following methaneevaporation at T~ 25-30 K. We are able to reproduce most of the observedmolecular abundances in L1527 at a time of ~5000 yr. At later times, theoverall abundance of anions become greater than that of electrons, which has animpact on many organic species and ions. The anion-to-neutral ratio in ourcalculation is in good agreement with observation for C6H- but exceeds theobserved ratio by more than three orders of magnitude for C4H-. In order toexplain this difference, further investigation is needed on the ratecoefficients for electron attachment and other reactions regarding anions.

Modeling Carbon Chain Anions in L1527