Poster Presentation

Physical and chemical modeling of starless cores

Author(s): Sheng-Jun Lin, Shih-Ping Lai, Laurent Pagani, Charlène Lefèvre, and François Lique

Presenter: Sheng-Jun Lin (NTHU)

The deuterium fractionation in starless cores gives us a clue to estimate their lifetime scales, thus allowing us to distinguish between
different dynamical theories of core formation. In order to constrain the lifetime scale, we perform chemical modeling of the deuteration
profiles based on dust extinction measurements from near-infrared observations and non-local thermal equilibrium radiative
transfer with multiple line observations of N2H+, N2D+, DCO+, C18O, and 13CO, plus H2D+ (110–1 11). With the help of time-dependent
chemical models, we can determine the age of starless cores.