72 citations · 505 across the 26 of their papers we have counts for
25 papers
Twisted magnetar magnetospheres: a class of semi-analytical force-free non-rotating solutions
Guillaume Voisin
Magnetospheric twists, that is magnetospheres with a toroidal component, are under scrutiny due to the key role the twist is believed to play in the behaviour of neutron stars. Not…
Geometrical envelopes of fast radio bursts
Guillaume Voisin
Aims. Assuming fast radio bursts (FRBs) are produced by matter travelling ultra-relativistically in a localised region of a smooth bundle of streamlines, we study the constraints a…
Neutron star mass estimates from gamma-ray eclipses in spider millisecond pulsar binaries
C. J. Clark, M. Kerr, E. D. Barr +26
Reliable neutron star mass measurements are key to determining the equation-of-state of cold nuclear matter, but these are rare. "Black Widows" and "Redbacks" are compact binaries…
A black widow population dissection through HiPERCAM multi-band light curve modelling
D. Mata Sánchez, M. R. Kennedy, C. J. Clark +7
Black widows are extreme millisecond pulsar binaries where the pulsar wind ablates their low-mass companion stars. Their optical light curves vary periodically due to the high irra…
Multi-colour optical light curves of the companion star to the millisecond pulsar PSR J2051-0827
V. S. Dhillon, M. R. Kennedy, R. P. Breton +16
We present simultaneous, multi-colour optical light curves of the companion star to the black-widow pulsar PSR J2051-0827, obtained approximately 10 years apart using ULTRACAM and…
One pulsar, two white dwarfs, and a planet confirming the strong equivalence principle
Guillaume Voisin, G Luth, I Cognard +7
The strong equivalence principle is a cornerstone of general relativity, tested with exquisite accuracy in the Solar system. However, tests in the strong-field regime require a com…
Measuring the mass of the black widow PSR J1555-2908
M. R. Kennedy, R. P. Breton, C. J. Clark +8
Accurate measurements of the masses of neutron stars are necessary to test binary evolution models, and to constrain the neutron star equation of state. In pulsar binaries with no…
Periodic activity from fast radio burst FRB180916 explained in the frameof the orbiting asteroid model
Guillaume Voisin, Fabrice Mottez, Philippe Zarka
Observation of fast radio bursts (FRBs) are rising very quickly with the advent of specialised instruments and surveys, and it has recently been shown that some of them repeat quas…
Optical photometry of two transitional millisecond pulsars in the radio pulsar state
James G. Stringer, Rene P. Breton, Colin J. Clark +7
We present ULTRACAM multiband optical photometry of two transitional millisecond pulsars, PSR J1023+0038 and PSR J12274853, taken while both were in their radio pulsar states. T…
Einstein@Home Discovery of the Gamma-ray Millisecond Pulsar PSR J2039-5617 Confirms Its Predicted Redback Nature
C. J. Clark, L. Nieder, G. Voisin +19
The Fermi Large Area Telescope gamma-ray source 3FGL J2039.65618 contains a periodic optical and X-ray source that was predicted to be a "redback" millisecond pulsar (MSP) binar…
A model for redistributing heat over the surface of irradiated spider companions
G. Voisin, M. R. Kennedy, R. P. Breton +2
Spider pulsars are binary systems containing an energetic millisecond pulsar that intensely irradiates a closely orbiting low-mass companion. Modelling their companion's optical li…
An improved test of the strong equivalence principle with the pulsar in a triple star system
Guillaume Voisin, Ismaël Cognard, Paulo Freire +5
The gravitational strong equivalence principle (SEP) is a cornerstone of the general theory of relativity (GR). The extreme difference in binding energy between neutron stars and w…
First measurement of the total gravitational quadrupole moment of a black widow companion
Guillaume Voisin, C Clark, R Breton +3
We present the first measurement of the gravitational quadrupole moment of the companion star of a spider pulsar, namely the black widow PSR J20510827. To this end we have re-an…
Repeating fast radio bursts caused by small bodies orbiting a pulsar or a magnetar
Fabrice Mottez, Philippe Zarka, Guillaume Voisin
Asteroids orbiting into the highly magnetized and highly relativistic wind of a pulsar offer a favourable configuration for repeating fast radio bursts (FRB). The body in direct co…
A spider timing model: accounting for quadrupole deformations and relativity in close pulsar binaries
Guillaume Voisin, René Breton, Charlotte Summers
Spider millisecond pulsars are, along with some eclipsing post-common envelope systems and cataclysmic variables, part of an expanding category of compact binaries with low-mass co…
Kepler K2 observations of the transitional millisecond pulsar PSR J1023+0038
M. R. Kennedy, C. J. Clark, G. Voisin +1
For 80 days in 2017, the Kepler Space Telescope continuously observed the transitional millisecond pulsar system PSR J1023+0038 in its accreting state. We present analyses of the 5…
Electron-positron pair production by gamma rays in an anisotropic flux of soft photons, and application to pulsar polar caps
Guillaume Voisin, Fabrice Mottez, Silvano Bonazzola
Electron-positron pair production by collision of photons is investigated in view of application to pulsar physics. We compute the absorption rate of individual gamma-ray photons b…
Quantum theory of curvature and synchro-curvature radiation in a strong and curved magnetic field, and applications to neutron star magnetospheres
Guillaume Voisin, Silvano Bonazzola, Fabrice Mottez
In a previous paper, we derived the quantum states of a Dirac particle in a circular, intense magnetic field in the limit of low momentum perpendicular to the field with the purpos…
Dirac states of an electron in a circular intense magnetic field
Guillaume Voisin, Silvano Bonazzola, Fabrice Mottez
Neutron-star magnetospheres are structured by very intense magnetic fields extending from 100 to 10 5 km traveled by very energetic electrons and positrons with Lorentz factors up…
Do asteroids evaporate near pulsars? Induction heating by pulsar waves revisited
Kumiko Kotera, Fabrice Mottez, Guillaume Voisin +1
We investigate the evaporation of close-by pulsar companions, such as planets, asteroids, and white dwarfs, by induction heating. Assuming that the outflow energy is dominated by a…
Kelvin probe force microscopy of metallic surfaces used in Casimir force measurements
R. O. Behunin, D. A. R. Dalvit, R. S. Decca +9
Kelvin probe force microscopy at normal pressure was performed by two different groups on the same Au-coated planar sample used to measure the Casimir interaction in a sphere-plane…
Convergence of bi-measure R-tree and the pruning process
Wolfgang Löhr, Guillaume Voisin, Anita Winter
In [Aldous,Pitman,1998] a tree-valued Markov chain is derived by pruning off more and more subtrees along the edges of a Galton-Watson tree. More recently, in [Abraham,Delmas,2012]…
Local time of a diffusion in a stable Lévy environment
Roland Diel, Guillaume Voisin
We consider a one-dimensional diffusion in a stable Lévy environment. We show that the normalized local time process refocused at the bottom of the standard valley with height $\lo…
Dislocation measure of the fragmentation of a general Lévy tree
Guillaume Voisin
Given a general critical or sub-critical branching mechanism and its associated Lévy continuum random tree, we consider a pruning procedure on this tree using a Poisson snake. It d…