Gravitational wave emission by the high braking index pulsar PSR J1640-4631

Abstract

Recently, a braking index for the pulsar PSR J1640-4631 has been measured. With a braking index of $n=3.15\pm 0.03$, this pulsar has the highest braking index ever measured. As it is well known, a pure magnetic dipole brake yields $n=3$, whereas a pure gravitational wave brake yields $n=5$. Therefore, each of these mechanisms alone can not account for the braking index found for PSR J1640-4631. Here we show that such a braking index can be accounted for if the spindown model combines magnetic dipole and gravitational wave brakes. Then, we briefly discuss the detectability of this pulsar by aLIGO and the planned Einstein Telescope. In particular, we show that the amplitude of the gravitational wave that comes from our model is around a factor four lower than the amplitude modeled exclusively by gravitational wave energy loss. Another interesting outcome of our modeling is that we are able to obtain the ellipticity from the braking index and other pulsar parameters.

8 pages, 1 figure

References in corpus (10)

• Observation of Gravitational Waves from a Binary Black Hole Merger
• Advanced LIGO
• A High Braking Index for a Pulsar
• New Phase-coherent Measurements of Pulsar Braking Indices
• First all-sky search for continuous gravitational waves from unknown sources in binary systems
• NuSTAR Discovery of a Young, Energetic Pulsar Associated with the Luminous Gamma-ray Source HESS J1640-465
• Predicting Ranges for Pulsars' Braking Indices
• Inclination angle and braking index evolution of pulsars with plasma-filled magnetosphere: application to high braking index of PSR J1640-4631
• The influence of quantum vacuum friction on pulsars
• Quantum Vacuum Friction in Highly Magnetized Neutron Stars

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• Possible evolution of the pulsar braking index from larger than three to about one
• Gravitational Radiation from hyperbolic encounters in the presence of dark matter
• Gravitational waves from fast-spinning white dwarfs
• Evidence for a multipolar magnetic field in SGR J1745-2900 from X-ray light-curve analysis
• Could the low braking index pulsar PSR J1734-3333 evolve into a magnetar?
• Gravitational waves from pulsars with measured braking index
• What can PSR J1640-4631 tell us about the internal physics of this neutron star?
• High braking index pulsar PSR J1640-4631: low-mass neutron star with a large inclination angle?
• Gravitational waves from SGRs and AXPs as fast-spinning white dwarfs
• Gravitational waves from pulsars in the context of magnetic ellipticity
• Relating Braking Indices of Young Pulsars to the Dynamics of Superfluid Cores
• Observational Constraints on the Pulsar Wind Model: The Cases of Crab and Vela
• Application of a two dipole model to PSR J1640-4631, a pulsar with an anomalous braking index
• Gravitational Wave Emission by Accretion of Matter and Magnetic Deformation in Fast Rotating White Dwarfs
• Evolution of Crab Pulsar: Magnetic Inclination Angle and Spin