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

(Abridged) As the stellar X-ray and UV light penetration of a protoplanetarydisk depends sensitively on the dust properties, trace molecular species likeHCO+, HCN, and CN are expected to show marked differences from photoprocessingeffects as the dust content in the disk evolves. We investigate the evolutionof the UV irradiation of the molecular gas in a sample of classical T Tauristars in Taurus that exhibit a wide range in grain growth and dust settlingproperties. We obtained HCO+ (J=3-2), HCN (J=3-2), and CN (J=2-1) observationsof 13 sources with the JCMT. Our sample has 1.3mm fluxes in excess of 75mJy,indicating the presence of significant dust reservoirs; a range of dustsettling as traced through their spectral slopes between 6, 13, and 25 microns;and varying degrees of grain growth as extrapolated from the strength of their10-micron silicate emission features. We compare the emission line strengthswith the sources' continuum flux and infrared features, and use detailedmodeling based on two different model prescriptions to compare typical diskabundances for HCO+, HCN, and CN with the gas-line observations for our sample.We detected HCO+ (3-2) toward 6 disks, HCN (3-2) from 0 disks, and CN (2-1)toward 4 disks. For the complete sample, there is no correlation between thegas-line strengths or their ratios and either the sources' dust continuum fluxor infrared slopes.

A single-dish survey of the HCO+, HCN, and CN emission toward the T Tauri disk population in Taurus