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Kilonova light curves from the disc wind outflows of compact object mergers

We study the radioactively-powered transients produced by accretion disk winds following a compact object merger. Starting with the outflows generated in two-dimensional hydrodynamical disk models,…
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Resonant Cyclotron Scattering in Three Dimensions and the Quiescent Nonthermal X-ray Emission of Magnetars

Although the surface of a magnetar is a source of bright thermal X-rays, its spectrum contains substantial nonthermal components. The X-ray emission is pulsed, with pulsed fractions that can be as…
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Internal heating of old neutron stars: contrasting different mechanisms

Context. The standard cooling models of neutron stars predict temperatures of T 10 7 yr. However, the likely thermal emission detected from the millisecond pulsar J0437-4715, of spin-down age t s ~7…
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Super-Eddington stellar winds driven by near-surface energy deposition

We develop analytic and numerical models of the properties of super-Eddington stellar winds, motivated by phases in stellar evolution when super-Eddington energy deposition (via, e.g., unstable…
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Proper Motion and Kinematics of the Ansae in NGC 7009

We have measured the proper motion (PM) and kinematics of the ansae in NGC 7009 using high-dispersion echelle spectra and archive narrowband Hubble Space Telescope images. Assuming that the ansae are…
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X-ray polarimetry with the Polarization Spectroscopic Telescope Array (PolSTAR)

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Mass Ejection in Failed Supernovae: Equation of State and Neutrino Loss Dependence

A failed core-collapse supernova from a nonrotating progenitor can eject mass due to a weakening of gravity associated with neutrino emission from the protoneutron star. This mechanism yields…
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From Neutrino- to Photon-cooled in Three Years: Can Fallback Accretion Explain the X-Ray Excess in GW170817?

Excess X-ray emission from the neutron star merger GW170817 above the predicted afterglow was recently detected t ≈ 3.4 yr post-merger. One possible origin is accretion onto the newly unshrouded…
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The Progenitors of Type Ia Supernova Explosions are Head-On Collisions of White Dwarfs in Triple Systems

We argue that type Ia supernovae (SNe Ia) are the result of head-on collisions of White Dwarfs (WDs) in triple systems. The thermonuclear explosions resulting from the zero-impact-parameter…

Rotochemical Heating of Neutron Stars: Rigorous Formalism with Electrostatic Potential Perturbations

The electrostatic potential that keeps approximate charge neutrality in neutron star matter is self-consistently introduced into the formalism for "rotochemical heating" presented in a previous paper…
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