Results 41 to 50 of about 50,731 (225)

Disentangling Impact Ejecta Dynamics Using Micro–X‐Ray Fluorescence (μ‐XRF): A Case Study From the Terrestrial Cretaceous‐Paleogene (K‐Pg) Boundary

Geochemistry, Geophysics, Geosystems
This study presents a non‐destructive geochemical and petrographic workflow to generate high‐resolution chemostratigraphic records across key stratigraphic intervals, exemplified by a terrestrial Cretaceous‐Paleogene (K‐Pg) boundary sequence preserved at
Pim Kaskes, Roald Tagle, Mariia Rey, Steven Goderis, Sophie Decrée, Jan Smit, Philippe Claeys   +6 more
doaj   +1 more source

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, Stefanie N. Milam, Anthony J. Remijan, Martin A. Cordiner, Michael W. Busch, Cristina A. Thomas, Andrew S. Rivkin, Arielle Moullet, Ted L. Roush, Mark A. Siebert, Jian-Yang Li, Eugene G. Fahnestock, Josep M. Trigo-Rodríguez, Cyrielle Opitom, Masatoshi Hirabayashi   +14 more
doaj   +1 more source

Spatial identification of the overionized plasma in W49B [PDF]

, 2010
Recent Suzaku X-ray observations of the ejecta-dominated supernova remnant W49B have shown that in the global spectrum there is a clear indication for the presence of overionized plasma whose physical origin is still under debate.
A. Decourchelle, F. Bocchino, F. Reale, Hwang, J. Ballet, Kawasaki, Keohane, Lacey, Lopez, Lopez, M. Miceli, Miceli, Miceli, Ozawa, Reale, Yamaguchi   +15 more
core   +2 more sources

Microspherules Formed by Lightning Strikes

Meteoritics &Planetary Science, EarlyView.
Abstract Natural microspherules are formed by high‐temperature processes and are present throughout the geologic record to the present day. We report the discovery of large numbers of microspherules recovered from a rock pavement in the Pilbara region, Western Australia.
M. R. Boyd, M. J. Genge, A. G. Tomkins
wiley   +1 more source

Analysis of Late--time Light Curves of Type IIb, Ib and Ic Supernovae

, 2015
The shape of the light curve peak of radioactive--powered core--collapse "stripped--envelope" supernovae constrains the ejecta mass, nickel mass, and kinetic energy by the brightness and diffusion time for a given opacity and observed expansion velocity.
Clocchiatti, A., Johnson, V., Wheeler, J. Craig   +2 more
core   +1 more source

Dense Iron Ejecta and Core-collapse Supernova Explosion in the Young Supernova Remnant G11.2-0.3 [PDF]

, 2009
We present the results of near-infrared spectroscopic observations of dense ($\simgt$ 10$^3$ cm$^{-3}$) iron ejecta in the young core-collapse supernova remnant G11.2-0.3.
Bon-Chul Koo, Burrows, Chevalier, Clark, Dae-Sik Moon, Fesen, Fesen, Gerardy, Ghavamian, Green, Ho-Gyu Lee, Hwang, Jae-Joon Lee, Janka, Ji Yeon Seok, Kaspi, Keith Matthews, Koo, Masahiko Hayashi, Meyer, Roberts, Tae-Soo Pyo, Tam, Torii, Walder, Weisskopf, Wheeler, Wheeler   +27 more
core   +3 more sources

Microbial Endolithic Community at Meteor Crater

Meteoritics &Planetary Science, EarlyView.
Abstract Postimpact recovery and evolution in response to climate changes produced a modern ecosystem at Meteor Crater dominated by a grassland and woodland of piñon and juniper, which has been used to evaluate floral and megafaunal consequences of impact cratering during the Phanerozoic Eon of complex life.
David A. Kring, Charles S. Cockell
wiley   +1 more source

Molecules in Supernova Ejecta [PDF]

Proceedings of the International Astronomical Union, 2011
AbstractThe first molecules detected at infrared wavelengths in the ejecta of a Type II supernova, namely SN1987A, consisted of CO and SiO. Since then, confirmation of the formation of these two species in several other supernovae a few hundred days after explosion has been obtained.
Cherchneff Isabelle, Sarangi Arkaprabha
openaire   +4 more sources

Confirmation of the impact origin of the Late Ordovician Tvären impact structure (southeast Sweden) and emplacement of impactites in a marine setting

Meteoritics &Planetary Science, EarlyView.
Abstract The Tvären structure in southeastern Sweden has been listed as a confirmed marine‐target impact structure for decades. However, to date, no measurements and/or indexed data of planar deformation features in quartz grains from the structure have been published or any other unequivocal evidence of impact.
Katarzyna J. Gajewska, Sanna Alwmark, Mikael Calner, Sylvain Richoz, Jens Ormö, Erik Sturkell, Carl Alwmark   +6 more
wiley   +1 more source

The Relation Between Ejecta Velocity, Intrinsic Color, and Host-Galaxy Mass for High-Redshift Type Ia Supernovae

, 2012
Recently, using a large low-redshift sample of Type Ia supernovae (SNe Ia), we discovered a relation between SN Ia ejecta velocity and intrinsic color that improves the distance precision of SNe Ia and reduces potential systematic biases related to dust ...
Amanullah, Blondin, Coil, Conley, Conley, Conley, Ellis, Foley, Foley, Foley, Foley, Foley, Frieman, Ganeshalingam, Hicken, Hicken, Holtzman, Hook, Howell, Howell, Howell, Höflich, Kasen, Kelly, Kelly, Kessler, Konishi, Lampeitl, Lentz, Leonard, Matheson, Matheson, Maund, Miknaitis, Nugent, Perlmutter, Riess, Riess, Riess, Ryan J. Foley, Sako, Sullivan, Wang, Wood-Vasey, Zheng   +44 more
core   +1 more source