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Charting Circumstellar Chemistry of Carbon-rich AGB Stars: I. ALMA 3 mm spectral surveys
R. Unnikrishnan, E. De Beck, L. A. Nyman +10
AGB stars are major contributors to the chemical enrichment of the ISM through nucleosynthesis and extensive mass loss. Most of our current knowledge of AGB atmospheric and circums…
The EDIBLES Survey. VII. A survey of C2 and C3 in interstellar clouds
Haoyu Fan, Carlos M. R. Rocha, Martin Cordiner +14
We carried out a sensitive survey of C and C using the EDIBLES data set. We also expanded our searches to C, C, and CC isotopologue in the most molecu…
A JWST inventory of protoplanetary disk ices: The edge-on protoplanetary disk HH 48 NE, seen with the Ice Age ERS program
J. A. Sturm, M. K. McClure, T. L. Beck +24
Ices are the main carriers of volatiles in protoplanetary disks and are crucial to our understanding of the chemistry that ultimately sets the organic composition of planets. The E…
The EDIBLES survey VI. Searching for time variations of interstellar absorption features
Amin Farhang, Jonathan Smoker, Nick L. J. Cox +10
Interstellar lines observed toward stellar targets change slowly over long timescales, mainly due to the proper motion of the background target relative to the intervening clouds.…
Low NH/HO ratio in comet C/2020 F3 (NEOWISE) at 0.7 au from the Sun
Maria N. Drozdovskaya, Dominique Bockelée-Morvan, Jacques Crovisier +7
A lower-than-solar elemental nitrogen content has been demonstrated for several comets, including 1P/Halley and 67P/C-G with independent in situ measurements of volatile and refrac…
Gas Sources from the Coma and Nucleus of Comet 46P/Wirtanen Observed Using ALMA
M. A. Cordiner, N. X. Roth, S. N. Milam +10
Gas-phase molecules in cometary atmospheres (comae) originate primarily from (1) outgassing by the nucleus, (2) sublimation of icy grains in the near-nucleus coma, and (3) coma (ph…