Nature, 1964 With the exception of a few supernova remnants which are in our galaxy, most cosmic radio sources are “radio galaxies”. Although flare stars do emit radio waves occasionally, no ordinary stars with strong, steady radio emission have been found. The typical optical power of stars is from 1030 ergs/sec (white dwarfs) to 1038 ergs/sec (super giants).
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Detecting and reconstructing gravitational waves from the next galactic core-collapse supernova in the advanced detector era [PDF]
Physical Review D, 2021 We performed a detailed analysis of the detectability of a wide range of gravitational waves derived from core-collapse supernova simulations using gravitational-wave detector noise scaled to the sensitivity of the upcoming fourth and fifth observing ...
M. Szczepańczyk +19 more
semanticscholar +1 more source
Turbulence Regulates the Rate of Planetesimal Formation via Gravitational Collapse [PDF]
Astrophysical Journal, 2020 We study how the interaction between the streaming instability (SI) and intrinsic gas-phase turbulence affects planetesimal formation via gravitational collapse in protoplanetary disks.
D. Gole +4 more
semanticscholar +1 more source
Equilibrium, radial stability and non-adiabatic gravitational collapse of anisotropic neutron stars [PDF]
The European Physical Journal C, 2020 In this work we construct families of anisotropic neutron stars for an equation of state compatible with the constraints of the gravitational-wave event GW170817 and for four anisotropy ansatze.
J. M. Pretel
semanticscholar +1 more source
Requirements for Gravitational Collapse in Planetesimal Formation—The Impact of Scales Set by Kelvin–Helmholtz and Nonlinear Streaming Instability [PDF]
Astrophysical Journal, 2020 The formation of planetesimals is a challenging problem in planet formation theory. A prominent scenario for overcoming dust growth barriers is the gravitational collapse of locally over-dense regions, shown to robustly produce ∼100 km–sized objects ...
Konstantin Gerbig +3 more
semanticscholar +1 more source
Gravitational collapse in cubic Horndeski theories [PDF]
Classical and quantum gravity, 2020 We study spherically symmetric gravitational collapse in cubic Horndeski theories of gravity. By varying the coupling constants and the initial amplitude of the scalar field, we determine the region in the space of couplings and amplitudes for which it ...
P. Figueras, Tiago França
semanticscholar +1 more source
Investigating gravitational collapse of a pebble cloud to form transneptunian binaries [PDF]
Astronomy & Astrophysics, 2020 Context. A large fraction of transneptunian objects are found in binary pairs, ~30% in the cold classical population between ahel ~ 39 and ~48 AU. Observationally, these binaries generally have components of similar size and colour.
James E. Robinson +3 more
semanticscholar +1 more source
Gravitational Waves from Neutrino Emission Asymmetries in Core-collapse Supernovae [PDF]
Astrophysical Journal, 2020 We present a broadband spectrum of gravitational waves (GWs) from core-collapse supernovae (CCSNe) sourced by neutrino emission asymmetries for a series of full 3D simulations.
D. Vartanyan, A. Burrows
semanticscholar +1 more source
Gravitational collapse in Einstein dilaton-Gauss–Bonnet gravity [PDF]
Classical and quantum gravity, 2019 We present results from a numerical study of spherical gravitational collapse in shift symmetric Einstein dilaton Gauss–Bonnet (EdGB) gravity. This modified gravity theory has a single coupling parameter that when zero reduces to general relativity (GR ...
Justin L. Ripley, F. Pretorius
semanticscholar +1 more source
Gravitational-wave signal of a core-collapse supernova explosion of a 15 M⊙ star [PDF]
Physical Review D, 2020 We report on the gravitational-wave signal computed in the context of a three-dimensional simulation of a core-collapse supernova explosion of a $15\text{ }{M}_{\ensuremath{\bigodot}}$ star.
K. Yakunin +9 more
semanticscholar +1 more source