Results 101 to 110 of about 4,877 (221)

On the Early Thermal Processing of Planetesimals during and after the Giant Planet Instability

The Planetary Science Journal
Born as ice-rich planetesimals, cometary nuclei were gravitationally scattered onto their current orbits in the Kuiper Belt and the Oort Cloud during the giant planets’ dynamical instability in the early stages of our solar system’s history.
Anastasios Gkotsinas, David Nesvorný, Aurélie Guilbert-Lepoutre, Sean N. Raymond, Nathan Kaib   +4 more
doaj   +1 more source

A Tale of “Two” Comets: The Primary Volatile Composition of Comet 2P/Encke Across Apparitions and Implications for Cometary Science

The Astronomical Journal, 2018
Abstract The highly favorable 2017 apparition of 2P/Encke allowed the first comprehensive comparison of primary volatile abundances in a given comet across multiple apparitions. This apparition offered opportunities to address pressing questions in cometary science, including investigating evolutionary and/or heliocentric distance (R
Nathan X. Roth, Erika L. Gibb, Boncho P. Bonev, Michael A. DiSanti, Neil Dello Russo, Ronald J. Vervack, Adam J. McKay, Hideyo Kawakita   +7 more
openaire   +1 more source

Spectroscopic Observations of the Comet 29P/Schwassmann-Wachmann 1 at the SOAR Telescope

, 2018
We carried out photometric and spectroscopic observations of comet 29P/ Schwassmann-Wachmann 1 at the SOAR 4.1-meter telescope (Chile) on August 12, 2016. This paper presents the results of only spectroscopic analysis. The spectra revealed presence of CO$
Andrievsky, Sergei M., Cavichia, Oscar, Ivanova, Oleksandra V., Luk'yanyk, Igor V., Picazzio, Enos   +4 more
core   +1 more source

Comprehensive Analyses of the Strongly Carbon-chain Depleted Comets in Lowell Observatory’s Narrowband Photometry Database

The Planetary Science Journal
We present measurements, analyses, and results for the 17 strongly carbon-chain depleted comets in Lowell Observatory’s narrowband photometry database.
Allison N. Bair, David G. Schleicher
doaj   +1 more source

Hyper-volatiles in Comet C/2010 G2 (Hill)

, 2013
We performed high-dispersion near-infrared spectroscopic observations of comet C/2010 G2 (Hill) at 2.5 AU from the Sun using NIRSPEC (R ~ 2.5x10^4) at the Keck II telescope on UT 2012 Jan 9 and 10. The comet had been in outburst. Over the two nights of our observations, prominent emission lines of CH4 and C2H6 along with weaker emission lines of H2O ...
Kawakita, Hideyo, Dello Russo, N., Vervack, R. J. J., Kobayashi, H., DiSanti, M. A., Opitom, Cyrielle, Jehin, Emmanuel, Weaver, H. A.   +7 more
openaire   +1 more source

The Ice Chemistry in Comets and Planet-forming Disks: Statistical Comparison of CH3OH, H2CO, and NH3 Abundance Ratios

The Astrophysical Journal Letters
Comets are frozen remnants of our solar system’s formation, and comparing their chemical composition to that of planet-forming systems can reveal crucial insights about our origins, potentially answering one of the most challenging questions in planetary
Manuela Lippi, Linda Podio, Claudio Codella, Sara Faggi, Marta De Simone, Geronimo L. Villanueva, Michael J. Mumma, Cecilia Ceccarelli   +7 more
doaj   +1 more source

The chemical diversity of comets

, 2009
A fundamental question in cometary science is whether the different dynamical classes of comets have different chemical compositions, which would reflect different initial conditions.
A. Lecacheux, D. Bockelée-Morvan, D. Bockelée-Morvan, D. Bockelée-Morvan, D.A. Neufeld, D.C. Lis, Dariusz C. Lis, Dominique Bockelée-Morvan, J. Crovisier, Jacques Crovisier, Jérémie Boissier, N. Biver, N. Biver, N. Biver, Nicolas Biver, Pierre Colom, S. Gulkis   +16 more
core   +1 more source

The Extreme Activity in Comet Hale–Bopp (C/1995 O1): Investigations of Extensive Narrowband Photoelectric Photometry

The Planetary Science Journal
Conventional narrowband photoelectric photometry of Comet Hale–Bopp (1995 O1) was obtained on 99 nights from mid-1995 to early-2000, yielding gas and dust production rates over an unprecedented range of time and distance. The appearance of Hale–Bopp (H-B)
David G. Schleicher, Peter V. Birch, Tony L. Farnham, Allison N. Bair   +3 more
doaj   +1 more source

Thermal Evolution of the Nucleus of the Comet 67P for 120 Years: Numerical Simulations

Open Astronomy, 2018
The purpose of this paper is to estimate to what temperatures and to what depth the outer layers of the cometary nuclei are heated for several dozen revolutions around the Sun, and what changes in the composition of the volatiles occur in this case. This
Rusol Andrey V., Dorofeeva Vera A.
doaj   +1 more source

Inferring the CO2 Abundance in Comet 45P/Honda-Mrkos-Pajdušáková from [O i] Observations: Implications for the Source of Icy Grains in Cometary Comae

The Planetary Science Journal
The study of cometary composition is important for understanding our solar system's early evolutionary processes. Carbon dioxide (CO _2 ) is a common hypervolatile in comets that can drive activity but is more difficult to study than other hypervolatiles
Mikayla R. Huffman, Adam J. McKay, Anita L. Cochran   +2 more
doaj   +1 more source