Results 31 to 40 of about 4,877 (221)
A Search for N2+ in Spectra of Comet C/2002C1 (Ikeya-Zhang) [PDF]
, 2002 We report low- and high-resolution spectra of comet C/2002 C1 (Ikeya-Zhang) from McDonald Observatory. The comet had a well-developed ion tail including CO+, CO2+, CH+, and H2O+. We used our high-resolution spectra to search for N2+.
A. L. Cochran +4 more
core +2 more sources
The Peculiar Volatile Composition of CO-dominated Comet C/2016 R2 (PanSTARRS) [PDF]
The Astronomical Journal, 2019 Abstract Comet C/2016 R2 (PanSTARRS) has a peculiar volatile composition, with CO being the dominant volatile, as opposed to H2O, and one of the largest N2/CO ratios ever observed in a comet. Using observations obtained with the Spitzer Space Telescope, NASA’s Infrared Telescope Facility, the 3.5 m Astrophysical Research Consortium ...
Adam J. McKay +16 more
openaire +4 more sources
CO and Other Volatiles in Distantly Active Comets
Publications of the Astronomical Society of the Pacific, 2017 The activity of most comets near the Sun is dominated by the sublimation of frozen water, the most abundant ice in comets. Some comets, however, are active well beyond the water-ice sublimation limit of ~3 au. Three bodies dominate the observational record and modeling efforts for distantly active comets: the long-period comet C/1995 O1 (Hale-Bopp ...
M. Womack, G. Sarid, K. Wierzchos
openaire +2 more sources
The Astronomical Journal, 2023 We report production rates of H _2 O and nine trace molecules (C _2 H _6 , CH _4 , H _2 CO, CH _3 OH, HCN, NH _3 , C _2 H _2 , OCS, and CO) in long-period comet C/2020 S3 (Erasmus) using the high-resolution, cross-dispersed infrared spectrograph (iSHELL)
Chemeda Ejeta +11 more
doaj +1 more source
Compact pebbles and the evolution of volatiles in the interstellar comet 2I/Borisov [PDF]
Nature Astronomy, 2021 12 pages, 4 ...
Bin Yang +8 more
openaire +2 more sources
Six Outbursts of Comet 46P/Wirtanen
The Planetary Science Journal, 2021 Cometary activity is a manifestation of sublimation-driven processes at the surface of nuclei. However, cometary outbursts may arise from other processes that are not necessarily driven by volatiles.
Michael S. P. Kelley +37 more
doaj +1 more source
Volatiles in protoplanetary disks [PDF]
, 2014 Volatiles are compounds with low sublimation temperatures, and they make up most of the condensible mass in typical planet-forming environments. They consist of relatively small, often hydrogenated, molecules based on the abundant elements carbon ...
Bergin, Edwin A. +6 more
core +2 more sources
Comet P/2021 HS (PANSTARRS) and the Challenge of Detecting Low-activity Comets
The Planetary Science Journal, 2023 Jupiter-family comet (JFC) P/2021 HS (PANSTARRS) only exhibits a coma within a few weeks of its perihelion passage at 0.8 au, which is atypical for a comet.
Quanzhi Ye +10 more
doaj +1 more source
Exploring the volatile composition of comets C/2012 F6 (Lemmon) and C/2012 S1 (ISON) with ALMA [PDF]
, 2017 Comets formed in the outer and cold parts of the disk which eventually evolved into our Solar System. Assuming that the comets have undergone no major processing, studying their composition provides insight in the pristine composition of the Solar Nebula.
Agúndez +35 more
core +3 more sources
Recurring Activity Discovered on Quasi-Hilda 2009 DQ118
The Astrophysical Journal Letters, 2023 We have discovered two epochs of activity on quasi-Hilda 2009 DQ _118 . Small bodies that display comet-like activity, such as active asteroids and active quasi-Hildas, are important for understanding the distribution of water and other volatiles ...
William J. Oldroyd +12 more
doaj +1 more source