carbon grain Archives

JWST MIRI-MRS spectrum of DoAr 33. The insets show isolated emission features of some of the molecules detected, and the calculated continuum is shown as a pink line. Most of the unmarked emission lines correspond to water vapor. We discuss the presence of dust emission features in Appendix A. -- astro-ph.EP

Astrochemistry, Astronomy & Telescopes, Biochemistry & Organic Chemistry, Biosignatures & Paleobiology, Imaging & Spectroscopy, Interstellar, Status Report

JWST/MIRI Detection Of A Carbon-rich Chemistry In A Solar Nebula Analog

by Keith CowingOctober 26, 2024October 26, 2024

It has been proposed, and confirmed by multiple observations, that disks around low mass stars display a molecule-rich emission and carbon-rich disk chemistry as compared to their hotter, more massive […]

The excitation temperatures of CH3CN (red stars), CH13 3 CN (blue circles), CH3OH (pink stars), and CH18 3 OH (cyan circles) where the measurement of excitation temperature was possible. The dashed lines show the mean for warm and hot methanol and methyl cyanide. The values for the 13C and 18O isotopologues of methyl cyanide and methanol are taken from Nazari et al. (2022b). Given the large error bars the hot excitation temperatures of methanol and methyl cyanide are similar. The same can be said for their warm components. -- astro-ph.EP

Astrochemistry, Astronomy & Telescopes, Biochemistry & Organic Chemistry, Status Report

Evidence For Ubiquitous Carbon Grain Destruction In Hot Protostellar Envelopes

by Keith CowingJune 21, 2023June 21, 2023

Earth is deficient in carbon and nitrogen by up to ∼4 orders of magnitude compared with the Sun. Destruction of (carbon- and nitrogen-rich) refractory organics in the high-temperature planet forming […]