English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

We present here findings for C18O depletion in eight starless cores inTaurus: TMC-2, L1498, L1512, L1489, L1517B, L1521E, L1495A-S, and L1544. Wecompare observations of the C18O J=2-1 transition taken with the ALMA prototypereceiver on the Heinrich Hertz Submillimeter Telescope to results of radiativetransfer modeling using RATRAN. We use temperature and density profilescalculated from dust continuum radiative transfer models to model the C18Oemission. We present modeling of three cores, TMC-2, L1489, and L1495A-S, whichhave not been modeled before and compare our results for the five cores withpublished models. We find that all of the cores but one, L1521E, aresubstantially depleted. We also find that varying the temperature profiles ofthese model cores has a discernable effect, and varying the central density hasan even larger effect. We find no trends with depletion radius or depletionfraction with the density or temperature of these cores, suggesting that thephysical structure alone is insufficient to fully constrain evolutionary state.We are able to place tighter constraints on the radius at which C18O isdepleted than the absolute fraction of depletion. As the timeline of chemicaldepletion depends sensitively on the fraction of depletion, this difficulty inconstraining depletion fraction makes comparison with other timescales, such asthe free-fall timescale, very difficult. Keywords: Stars:Formation --ISM:abundances-- ISM:clouds -- Individual Objects: TMC-2, L1498, L1512, L1489,L1517B, L1521E, L1495A-S, L1544

C18O Depletion in Starless Cores in Taurus