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 Tools annual

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 monthly

Global: Zendy Plus monthly

Presents the access of premium content as premium feature

Premium Content

Global: Zendy Plus annual

Global: Zendy Free Plan

We investigated the chemical evolutions of gas phase and grain surfacespecies across the Taurus molecular cloud-1 (TMC-1) filament from translucentphase to dense phase. By comparing observations with modeling results from anup-to-date chemical network, we examined the conversion processes for thecarbon-, oxygen-, nitrogen- and sulfur-bearing species, i.e.from their initialatomic form to their main molecular reservoir form both in the gas phase and onthe grain surface. The conversion processes were found to depend on the speciesand A$_V$. The effect of initial carbon to oxygen elemental abundances ratio(C/O) by varying O on the chemistry was explored, and an initial carbonelemental abundance of 2.5 $\times$ 10$^{-4}$ and a C/O ratio of 0.5 could bestreproduce the abundances of most observed molecules at TMC-1 CP, where morethan 90 molecules have been identified. Based on the TMC-1 condition, wepredicted a varied grain ice composition during the evolutions of molecularclouds, with H$_2$O ice as the dominant ice composition at A$_V$ $>$ 4 mag,CO$_2$ ice as the dominant ice composition at A$_V$ $<$ 4 mag, while CO iceseverely decreased at A$_V$ around 4--5 mag.

Chemical variations across the TMC-1 boundary: molecular tracers from translucent phase to dense phase