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

In a low-metallicity gas, rapid cooling by dust thermal emission isconsidered to induce cloud fragmentation and play a vital role in the formationof low-mass stars (<~ 1 M_sun) in metal-poor environments. We investigate howthe growth of dust grains through accretion of heavy elements in the gas phaseonto grain surfaces alters the thermal evolution and fragmentation propertiesof a collapsing gas cloud. We calculate directly grain growth and dust emissioncooling in a self-consistent manner. We show that MgSiO3 grains growsufficiently at gas densities nH = 10^{10}, 10^{12}, and 10^{14} /cc formetallicities Z = 10^{-4}, 10^{-5}, and 10^{-6} Zsun, respectively, where thecooling of the collapsing gas cloud is enhanced. The condition for efficientdust cooling is insensitive to the initial condensation factor of pre-existinggrains within the realistic range of 0.001--0.1, but sensitive to metallicity.The critical metallicity is Zcrit ~ 10^{-5.5} Zsun for the initial grain radiusr_{MgSiO3,0} <~ 0.01 um and Zcrit ~ 10^{-4.5} Zsun for r_{MgSiO3,0} >~ 0.1 um.The formation of a recently discovered low-mass star with extremely lowmetallicity (<= 4.5x10^{-5} Zsun) could have been triggered by grain growth.

Growth of dust grains in a low-metallicity gas and its effect on the cloud fragmentation