Results 31 to 40 of about 56,805 (216)
Initial 40Ar‐39Ar Ages of the Paleocene‐Eocene Boundary Impact Spherules
Geophysical Research Letters, 2019 We report 40Ar‐39Ar step‐heating ages of Paleocene‐Eocene (P‐E) boundary impact spherules from Atlantic Margin coastal plain and open ocean sites. We test the hypothesis that the P‐E spherules are reworked from an earlier event (e.g., K‐Pg impact at ~66 ...
Morgan F. Schaller +4 more
doaj +1 more source
Atmospheric Interactions of Ejecta on Earth and Mars Including the Effect of Vaporization
The Planetary Science Journal, 2023 Atmospheres play an important role in ejecta deposition after an impact event. Many impact experiments and simulations neglect the effect of atmospheres.
M. A. Carlson +2 more
doaj +1 more source
Cosmic noise absorption signature of particle precipitation during interplanetary coronal mass ejection sheaths and ejecta [PDF]
Annales Geophysicae, 2020 We study here energetic-electron (E>30 keV) precipitation using cosmic noise absorption (CNA) during the sheath and ejecta structures of 61 interplanetary coronal mass ejections (ICMEs) observed in the near-Earth solar wind between 1997 and ...
E. Kilpua +13 more
doaj +1 more source
Trans-Ejecta High-Energy Neutrino Emission from Binary Neutron Star Mergers [PDF]
, 2018 The observations of a macronova/kilonova accompanied by gravitational waves from a binary neutron star merger (GW170817) confirmed that neutron star coalescences produce copious ejecta.
Bartos, Imre +5 more
core +2 more sources
Jet-shaped geometrically modified light curves of core collapse supernovae [PDF]
, 2020 We build three simple bipolar ejecta models for core collapse supernovae (CCSNe), as expected when the explosion is driven by strong jets, and show that for an observer located in the equatorial plane of the ejecta, the light curve has a rapid luminosity decline, and even an abrupt drop.
arxiv +1 more source
Ejecta cloud distributions for the statistical analysis of impact cratering events onto asteroids' surfaces: a sensitivity analysis [PDF]
, 2023 This work presents the model of an ejecta cloud distribution to characterise the plume generated by the impact of a projectile onto asteroids surfaces. A continuum distribution based on the combination of probability density functions is developed to describe the size, ejection speed, and ejection angles of the fragments.
arxiv +1 more source
The Ejecta of Classical Novae [PDF]
Symposium - International Astronomical Union, 2001 Classical novae are interacting binary stars in which a thermonuclear runaway in material accreted onto a white dwarf from a companion red dwarf results in the ejection of around 10−4M⊙ at hundreds to thousands of kilometres per second. Recent Hubble Space Telescope and MERLIN imaging of the expanding ejecta from several classical novae are presented ...
John M. Porter +4 more
openaire +2 more sources
ALMA Observations of the DART Impact: Characterizing the Ejecta at Submillimeter Wavelengths
The Planetary Science Journal, 2023 We report observations of the Didymos–Dimorphos binary asteroid system using the Atacama Large Millimeter/submillimeter Array (ALMA) and the Atacama Compact Array (ACA) in support of the Double Asteroid Redirection Test mission.
Nathan X. Roth +14 more
doaj +1 more source
Mechanical Engineering Journal, 2016 As a preliminary study, the effects of target temperature on ejecta size were examined at an impact velocity of 3.5 km/s with the goal of improving the ISO11227.
Masahiro NISHIDA +7 more
doaj +1 more source
The ionization of novae ejecta [PDF]
International Astronomical Union Colloquium, 1990 AbstractNovae ejecta pass through four distinct phases of evolution of the emission-line spectrum, caused by different ionization characteristics of the shell. These include a neutral (I), an auroral (II), a coronal (III), and a nebular (IV) phase. Photoionization from the contracting photosphere of the hot white dwarf is the source of the ionization ...
openaire +2 more sources