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 this study, we employed broadband X-rays ($6-2000$ eV) to irradiate thefrozen acetone CH$_3$COCH$_3$, at the temperature of 12 K, with differentphoton fluences up to $2.7\times 10^{18}$ photons cm$^{-2}$. Here, we consideracetone as a representative complex organic molecule (COM) present oninterstellar ice grains. The experiments were conduced at the Braziliansynchrotron facility (LNLS/CNPEN) employing infrared spectroscopy (FTIR) tomonitor chemical changes induced by radiation in the ice sample. We determinedthe effective destruction cross-section of the acetone molecule and theeffective formation cross-section for daughter species. Chemical equilibrium,obtained for fluence $2\times 10^{18}$ photons cm$^{-2}$, and molecularabundances at this stage were determined, which also includes the estimates forthe abundance of unknown molecules, produced but not detected, in the ice.Timescales for ices, at hypothetical snow line distances, to reach chemicalequilibrium around several compact and main-sequence X-ray sources are given.We estimate timescales of 18 days, 3.6 and 1.8 months, $1.4\times 10^9-6\times10^{11}$ years, 600 and $1.2\times 10^7$ years, and $10^7$ years, for the Sunat 5 AU, for O/B stars at 5 AU, for white dwarfs at 1 LY, for the Crab pulsarat 2.25 LY, for Vela pulsar at 2.25 LY, and for Sagittarius A* at 3 LY,respectively. This study improves our current understanding about radiationeffects on the chemistry of frozen material, in particular, focusing for thefirst time, the effects of X-rays produced by compact objects in their eventualsurrounding ices.

X-ray photolysis of CH$_3$COCH$_3$ ice: Implications for the radiation effects of compact objects towards astrophysical ices