Search Publications
ALMA Spectral Survey of an Eruptive Young Star, V883 Ori (ASSAY). II. Freshly Sublimated Complex Organic Molecules in the Keplerian Disk
Herczeg, Gregory J.; Johnstone, Doug; Lee, Jeong-Eun +9 more
We present an investigation of complex organic molecules (COMs) in the spatially resolved Keplerian disk around V883 Ori, an eruptive young star, based on a spectral survey carried out with the Atacama Large Millimeter/submillimeter Array in Band 6 (220.7‑274.9 GHz). We identified about 3700 molecular emission lines and discovered 23 COMs in the d…
On the Abiotic Origin of Dimethyl Sulfide: Discovery of Dimethyl Sulfide in the Interstellar Medium
Caselli, Paola; Martín, Sergio; Jiménez-Serra, Izaskun +14 more
Following the discovery of dimethyl sulfide (DMS; CH3SCH3) signatures in comet 67P/Churyumov–Gerasimenko, we report the first detection of this organosulfur species in the interstellar medium during the exploration of an ultradeep molecular line survey performed toward the Galactic center molecular cloud G+0.693-0.027 with th…
Two methods for determining the temperature on the surface of the cometary nucleus based on spectroscopic measurements
Wesołowski, Marcin; Potera, Piotr; Kucab, Krzysztof
The paper presents two methods that can be used to determine the surface temperature of a cometary nucleus. The key role in this approach is played by the measurement of hemispherical albedo for selected dust analogues, which was performed using a Cary 5000 spectrometer. To most accurately reflect the actual structure of the dust layer present on …
The extent of formation of organic molecules in the comae of comets showing relatively high activity
Acharyya, Kinsuk; Ahmed, Sana
Comets are a rich reservoir of complex organic molecules. Ground and space-based observatories have recently greatly enhanced the cometary molecular inventory. Although these molecules' origin is believed to be the cometary nucleus, they can be partially synthesized in the coma. We studied organic molecules' nucleus versus coma origins for various…
The refractory-to-ice ratio in comet 67P: Implications on the composition of the comet-forming region of the protoplanetary disk
Morbidelli, Alessandro; Marschall, Raphael; Marrocchi, Yves
Comets, asteroids, and other small bodies are thought to be remnants of the original planetesimal population of the Solar System. As such, their physical, chemical, and isotopic properties hold crucial details on how and where they formed and how they evolved. Yet, placing precise constraints on the formation region of these bodies has been challe…
Primordial Origin of Methane on Eris and Makemake Supported by D/H Ratios
Mousis, Olivier; Werlen, Aaron; Benest Couzinou, Tom +1 more
Deuterium, a heavy isotope of hydrogen, is a key tracer of the formation of the solar system. Recent James Webb Space Telescope observations have expanded the data set of deuterium-to-hydrogen (D/H) ratios in methane on the KBOs Eris and Makemake, providing new insights into their origins. This study examines the elevated D/H ratios in methane on …
Boulder Migration in the Khonsu Region of Comet 67P/Churyumov–Gerasimenko
Shi, Xian; El-Maarry, Mohamed Ramy; Tang, Xiang
The European Space Agency's Rosetta mission is the only space mission that has performed long-term monitoring of a comet at close distances. For over two years, Rosetta rendezvoused with comet 67P/Churyumov–Gerasimenko, which revealed diverse evolutionary processes of the cometary nucleus. One of the most striking events is the migration of a ∼30 …
Land of gas and dust - exploring bursting cavities on comet 67P
De Keyser, Johan; Berthelier, Jean-Jacques; Wurz, Peter +9 more
Gas and dust outbursts are recurring phenomena on comets, offering critical insights into their subsurface activities. On comet 67P/Churyumov-Gerasimenko, two distinct outburst types have been identified: CO
Photolysis and Sublimation Chemistry of Ammonium Cyanide with Relevance to Cometary Environments
Gerakines, P. A.; Milam, S. N.; Yocum, K. M. +3 more
Bulk nitrogen is depleted in solar system objects, including the terrestrial planets, chondritic meteorites, and comets. Recently, it was suggested that cometary nitrogen may be locked up in ammonium salts—ionic solids comprising ammonia (NH3) and an acid such as hydrogen cyanide (HCN)—based on Rosetta/ROSINA data from comet 67P/Churyum…
Modeling of comet water production: I. Sensitivity to macro- and micro-model parameters
Küppers, M.; Hartogh, P.; Rezac, L. +3 more
Aims. This study investigates the impact of microscopic and macroscopic cometary surface properties on water production variations with heliocentric distance, focusing on dust layer thickness, grain size, nucleus shape, and spin axis orientation. Methods. We employed a two-layer thermophysical model to calculate effective gas production, incorpora…