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Your search keyword '"van Kerkwijk, M."' showing total 14 results
Start Over Author "van Kerkwijk, M." Journal monthly notices of the royal astronomical society
14 results on '"van Kerkwijk, M."'

2. Multicolour optical light curves of the companion star to the millisecond pulsar PSR J2051−0827

Author

Dhillon, V S, primary, Kennedy, M R, additional, Breton, R P, additional, Clark, C J, additional, Mata Sánchez, D, additional, Voisin, G, additional, Breedt, E, additional, Brown, A J, additional, Dyer, M J, additional, Green, M J, additional, Kerry, P, additional, Littlefair, S P, additional, Marsh, T R, additional, Parsons, S G, additional, Pelisoli, I, additional, Sahman, D I, additional, Wild, J F, additional, van Kerkwijk, M H, additional, and Stappers, B W, additional

Published
2022
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3. Plasma lensing near the eclipses of the Black Widow pulsar B1957+20.

Author

Lin, F X, Main, R A, Jow, D, Li, D Z, Pen, U-L, and van Kerkwijk, M H

Subjects
GRAVITATIONAL lenses, PULSARS, RELATIVE velocity, ECLIPSES, ACTINIC flux, ECLIPSING binaries, STELLAR atmospheres, GALAXY clusters
Abstract

Recently, several eclipsing millisecond pulsars have been shown to experience strong and apparent weak lensing from the outflow of their ionized companions. Lensing can be a powerful probe of the ionized plasma, with the strongest lenses potentially resolving emission regions of pulsars. Understanding lensing in the 'laboratory-like' conditions of an eclipsing pulsar may be analogously applied to fast radio bursts, many of which reside in dense, magnetized environments. We examined variable dispersion measure (DM), absorption, scattering, and flux density in the original Black Widow pulsar PSR B1957+20 through an eclipse at the Arecibo Observatory at |$327\, {\rm MHz}$|⁠. We discovered clear evidence of the two regimes of lensing, strong, and apparent weak. We show that the flux density variations in the apparently weak lensing regime can be modelled directly from variations of DM, using geometric optics. The mean effective velocities in the ingress, |$(954\pm 99)\, {\rm km\, s^{-1}}$|⁠ , and egress |$(604\pm 47)\, {\rm km\, s^{-1}}$| cannot be explained by orbital motions alone, but are consistent with significant outflow velocity of material from the companion. We also show that geometric optics can predict when and where the lensing regime-change between weak and strong occurs, and argue that the apparent weak lensing is due to averaging many images. Our framework can be applied in any source with variable electron columns, measuring their relative velocities and distances. In other eclipsing pulsars, this provides a unique opportunity to measure companion outflow velocity, predict regions of weak and strong lensing, and in principle independently constrain orbital inclinations. [ABSTRACT FROM AUTHOR]

Published
2023
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4. Measuring the mass of the black widow PSR J1555-2908

Author

Kennedy, M R, primary, Breton, R P, additional, Clark, C J, additional, Mata Sánchez, D, additional, Voisin, G, additional, Dhillon, V S, additional, Halpern, J P, additional, Marsh, T R, additional, Nieder, L, additional, Ray, P S, additional, and van Kerkwijk, M H, additional

Published
2022
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