Results 131 to 140 of about 70,331 (294)

The 3-D Structure of SN 1987A's inner Ejecta

, 2010
Twenty years after the explosion of SN 1987A, we are now able to observe the three-dimensional spatially resolved inner ejecta. Detailed mapping of newly synthesised material and its radioactive decay daughter products sheds light on the explosion ...
A. Jerkstrand, Ahmad, Arnett, B. Leibundgut, Blondin, Blondin, Buras, Burrows, C. Fransson, Chugai, Cohen, Cropper, Dessart, Fassia, Fitzpatrick, Fransson, Gröningsson, Gröningsson, Gröningsson, Hammer, J. Spyromilio, Jeffery, K. Kjær, Kifonidis, Kitaura, Kjær, Kozma, Kozma, Kozma, Krause, McCray, Meikle, Nisenson, Pun, Reed, Rousselot, Sonneborn, Staveley-Smith, Sugerman, Walborn, Wang, Wang, West, Wheeler, Wooden, Woosley, Woosley, Zanardo   +47 more
core   +1 more source

Multispectral Observations of Float Rocks Used to Investigate the Origin of Boulders on the Western Jezero Fan Front, Mars

Journal of Geophysical Research: Planets, Volume 130, Issue 6, June 2025.
Abstract In Jezero crater, Mars, the Perseverance rover has explored the western fan and encountered loose pieces of rock separated from outcrops or “float” rocks. Comparing float rocks to in‐place outcrops can provide key insights into the crater's erosional history and the diversity of units in the Jezero watershed that Perseverance cannot visit in ...
B. S. Kathir, M. S. Rice, B. H. N. Horgan, L. Mandon, J. R. Johnson, K. M. Stack, A. P. Broz, N. Williams, N. Mangold, R. C. Wiens, J. I. Simon, C. C. Bedford, A. Bechtold, B. J. Garczynski, A. Vaughan, N. Randazzo, R. A. Yingst, S. A. Theuer, G. Paar, J. Martínez‐Frías, J. I. Núñez, T. Fouchet   +21 more
wiley   +1 more source

Physics of the Inner Ejecta [PDF]

, 2012
Eta Carinae's inner ejecta are dominated observationally by the bright Weigelt blobs and their famously rich spectra of nebular emission and absorption lines. They are dense (n_e ~ 10^7 to 10^8 cm^-3), warm (T_e ~ 6000 to 7000 K) and slow moving (~40 km/s) condensations of mostly neutral (H^0) gas.
openaire   +3 more sources

Ejecta sources and scalings [PDF]

AIP Conference Proceedings, 2018
We discuss the processes controlling ejecta particle production and breakup, as a result of shock wave compression of condensed matter and in broader contexts. We present analytic models for the mass-velocity distribution, particle size and total mass saturation of fluid jets from regular surface perturbations.
openaire   +2 more sources

Dynamics, nucleosynthesis, and kilonova signature of black hole—neutron star merger ejecta [PDF]

, 2016
We investigate the ejecta from black hole—neutron star mergers by modeling the formation and interaction of mass ejected in a tidal tail and a disk wind.
R. Fern'andez, F. Foucart, D. Kasen, J. Lippuner, Dhruv Desai, L. Roberts   +5 more
semanticscholar   +1 more source

Compton degradation of gamma-ray line emission from radioactive isotopes in the classical nova V2491 Cygni

, 2010
To account for the non-thermal emission from the classical nova V2491 Cygni, we perform a series of numerical calculations of radiative transfer of \gamma-ray photons from the radioactive isotope $^{22}$Na in the matter ejected from a white dwarf.
Coc, Hachisu, Helton, Ibarra, Ibarra, Iliadis, Iyudin, Jose, Kuulkers, Makino, Makino, Munari, Nakano, Sallaska, Starrfield, Sunyaev, Suzuki, Takei, Tomov, Tomov, Wanajo, Weiss   +21 more
core   +1 more source

Groundwater Sapping in Hack Crater (Mars): Geologic Evidence and Geophysical Modeling of Groundwater Stability

Journal of Geophysical Research: Planets, Volume 130, Issue 6, June 2025.
Abstract This study investigates Hack crater in Arabia Terra on Mars, which exhibits remarkable water‐related landforms, suggesting a period of intense water activity despite lacking a connection with large‐scale fluvial networks. Instead, short valleys within its walls display morphologies indicative of mass‐wasting processes driven by groundwater ...
B. De Toffoli, A.‐C. Plesa, E. Luzzi, E. Hauber   +3 more
wiley   +1 more source

Inferring supernova IIb/Ib/Ic ejecta properties from light curves and spectra: correlations from radiative-transfer models [PDF]

, 2016
We present 1-D non-Local-Thermodynamic-Equilibrium time-dependent radiative-transfer simulations for a large grid of supernovae (SNe) IIb/Ib/Ic that result from the terminal explosion of the mass donor in a close-binary system.
L. Dessart, D. J. Hillier, S. Woosley, E. Livne, R. Waldman, Sung-Chul Yoon, N. Langer   +6 more
semanticscholar   +1 more source

The Meter‐Scale Roughness of Asteroid (101955) Bennu From the OSIRIS‐REx Laser Altimeter

Journal of Geophysical Research: Planets, Volume 130, Issue 6, June 2025.
Abstract Asteroid (101955) Bennu is a near‐Earth, potentially hazardous, rubble pile asteroid, and was the primary target of the NASA OSIRIS‐REx mission. The surface is dominated by the expression of boulders and has been heavily modified by impact cratering. Here, we analyze surface roughness, calculated using data from the OSIRIS‐REx Laser Altimeter,
F. M. Rossmann, C. L. Johnson, E. B. Bierhaus   +2 more
wiley   +1 more source

Spectroscopic r-process Abundance Retrieval for Kilonovae. II. Lanthanides in the Inferred Abundance Patterns of Multicomponent Ejecta from the GW170817 Kilonova

The Astrophysical Journal
In kilonovae, freshly synthesized r -process elements imprint features on optical spectra, as observed in AT2017gfo, the counterpart to the GW170817 binary neutron star merger.
Nicholas Vieira, John J. Ruan, Daryl Haggard, Nicole M. Ford, Maria R. Drout, Rodrigo Fernández   +5 more
doaj   +1 more source