Results 61 to 70 of about 53,459 (199)

JWST NIRSpec Observations of Supernova 1987A—From the Inner Ejecta to the Reverse Shock

The Astrophysical Journal Letters, 2023
We present initial results from JWST NIRSpec integral field unit observations of the nearby supernova SN 1987A. The observations provide the first spatially resolved spectroscopy of the ejecta and equatorial ring (ER) over the 1–5 μ m range. We construct
J. Larsson, C. Fransson, B. Sargent, O. C. Jones, M. J. Barlow, P. Bouchet, M. Meixner, J. A. D. L. Blommaert, A. Coulais, O. D. Fox, R. Gastaud, A. Glasse, N. Habel, A. S. Hirschauer, J. Hjorth, J. Jaspers, P. J. Kavanagh, O. Krause, R. M. Lau, L. Lenkić, O. Nayak, A. Rest, T. Temim, T. Tikkanen, R. Wesson, G. S. Wright   +25 more
doaj   +1 more source

Influences of Non‐Oberbeck–Boussinesq Effects on Tracer Transport in Icy Ocean Worlds

Journal of Geophysical Research: Planets, Volume 130, Issue 7, July 2025.
Abstract The subsurface oceans on icy satellites are potentially habitable. To understand their habitability, we need to know how tracers with various lifetimes distribute. Convection is the main vehicle for tracer transport, and we expect convection on icy satellites to differ from regular rotating convection, because as pressure increases, water's ...
Shuang Wang, Wanying Kang
wiley   +1 more source

Exploring the Impact of the Ejecta Velocity Profile on the Evolution of Kilonova: Diversity of the Kilonova Lightcurves

The Astrophysical Journal, 2023
A kilonova is a short-lived explosive event in the Universe, resulting from the merger of two compact objects. Despite its importance as a primary source of heavy elements through r -process nucleosynthesis, its nature is not well understood due to its ...
Donggeun Tak, Z. Lucas Uhm, James H. Gillanders   +2 more
doaj   +1 more source

Infrared emission from kilonovae: the case of the nearby short hard burst GRB 160821B [PDF]

, 2017
We present constraints on Ks-band emission from one of the nearest short hard gamma-ray bursts, GRB 160821B, at z=0.16, at three epochs. We detect a reddened relativistic afterglow from the jetted emission in the first epoch but do not detect any excess ...
Fryer, Christopher L., Kasliwal, Mansi M., Korobkin, Oleg, Lau, Ryan M., Wollaeger, Ryan   +4 more
core   +3 more sources

Seismic Evidence of Impact Breccia and Unlithified Sediments Under Hiawatha Glacier

Journal of Geophysical Research: Earth Surface, Volume 130, Issue 7, July 2025.
Abstract Hiawatha Crater in northwest Greenland is one of only two putative impact craters under an ice sheet. Hiawatha therefore offers a rare proxy for understanding the interactions between active glacial dynamics and impact craters on other planetary bodies.
Rishi Chandra, Kiya L. Riverman, Daniella N. DellaGiustina, Erin C. Pettit, Nicholas C. Schmerr, Georgia Carroll, Veronica J. Bray, S. Hop Bailey   +7 more
wiley   +1 more source

Interpolating detailed simulations of kilonovae: Adaptive learning and parameter inference applications

Physical Review Research, 2022
Detailed radiative transfer simulations of kilonovae are difficult to apply directly to observations; they only sparsely cover simulation parameters, such as the mass, velocity, morphology, and composition of the ejecta.
M. Ristic, E. Champion, R. O'Shaughnessy, R. Wollaeger, O. Korobkin, E. A. Chase, C. L. Fryer, A. L. Hungerford, C. J. Fontes   +8 more
doaj   +1 more source

Exchange of ejecta between Telesto and Calypso: Tadpoles, horseshoes, and passing orbits

, 2010
We have numerically integrated the orbits of ejecta from Telesto and Calypso, the two small Trojan companions of Saturn's major satellite Tethys. Ejecta were launched with speeds comparable to or exceeding their parent's escape velocity, consistent with ...
Alvarellos, Alvarellos, Alvarellos, Anthony R. Dobrovolskis, Arias, Bate, Danby, Dermott, Dermott, Dobrovolskis, Dobrovolskis, Dobrovolskis, Housen, Izidoro, Jack J. Lissauer, José Luis Alvarellos, Kempf, Kevin J. Zahnle, Lecacheux, Levison, Lissauer, Melosh, Melosh, Melosh, Melosh, Murray, Porco, Seidelmann, Shoemaker, Sinclair, Szebehely, Wisdom, Zahnle, Zahnle, Zahnle, Zahnle   +35 more
core   +1 more source

Global Lunar Boulder Map From LRO NAC Optical Images Using Deep Learning: Implications for Regolith and Protolith

Journal of Geophysical Research: Planets, Volume 130, Issue 7, July 2025.
Abstract Boulders on the lunar surface indicate relatively recent surface activity, related to mass wasting or bedrock excavation by impact cratering, and degrade over time, producing regolith. Previously, the distribution of boulders was indirectly assessed using the anisothermality effects observed by the Lunar Reconnaissance Orbiter (LRO) Diviner ...
B. Aussel, O. Rüsch, B. Gundlach, V. T. Bickel, S. Kruk, E. Sefton‐Nash   +5 more
wiley   +1 more source

Linking Analytic Light-curve Models to Physical Properties of Kilonovae

The Astrophysical Journal
In binary neutron star mergers, lanthanide-rich dynamical ejecta and lanthanide-poor postmerger ejecta have often been linked to red and blue kilonova emission, respectively.
Ayari Kitamura, Kyohei Kawaguchi, Masaomi Tanaka, Sho Fujibayashi   +3 more
doaj   +1 more source

Ejecta velocities in twice-shocked liquid metals under extreme conditions: A hydrodynamic approach

Matter and Radiation at Extremes, 2019
We apply a hydrodynamic approach to analyze ejecta emanating from doubly shocked liquid metals. In particular, we are interested in characterizing ejecta velocities in such situations by treating the problem as a limiting case of the ...
V. Karkhanis, P. Ramaprabhu
doaj   +1 more source