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Evidence from a processing pulsar orbit for a neutron-star birth kick

Kaspi, V. M. and Bailes, M. and Manchester, R. N. and Stappers, B. W. and Bell, J. F. (1996) Evidence from a processing pulsar orbit for a neutron-star birth kick. Nature, 381 (6583). pp. 584-586. ISSN 0028-0836. doi:10.1038/381584a0.

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BIRTH 'kicks' to neutron stars, resulting from asymmetric supernova explosions, have been proposed to explain the high velocities of pulsars, the existence of companionless, high-velocity massive stars, and a putative Galactic halo of neutron stars. The kick hypothesis has been controversial, because most of the evidence for kicks is indirect, and a physical mechanism to produce asymmetric explosions is as yet unknown. Here we report five years of radio observations of the pulsar PSR J0045 – 7319, which is in an eccentric orbit around a B star. The data show significant deviations from a simple keplerian orbit, which we interpret as arising from advance of the pulsar's periastron and spin–orbiting coupling. Both effects arise because of the B star's rotationally induced equatorial bulge, however spin–orbit coupling requires the B star's spin axis to be inclined with respect to the orbital angular momentum vector; we find that the inclination angle is between 25 and 41 degrees. In the likely event that the angular momenta were aligned before the supernova explosion, this misalignment provides direct evidence that the neutron star received a kick at birth.

Item Type:Article
Related URLs:
URLURL TypeDescription ReadCube access
Kaspi, V. M.0000-0001-9345-0307
Bailes, M.0000-0003-3294-3081
Bell, J. F.0000-0002-2006-4074
Additional Information:© 1996 Nature Publishing Group. Received 14 March; accepted 30 April 1996. We thank D. Lai and T. Tauris for helpful discussions. Parts of observing systems were constructed at the University of Manchester, Jodrell Bank, and the Istituto di Radioastronomia del CNR, Bologna. This research was carried out at the Jet Propulsion Laboratory, California Institute of Technology, under contract to NASA. V.M.K. received support from a Hubble Fellowship from the Space Telescope Science Institute, operated by the Association of Universities for Research in Astronomy, Inc., under contract to NASA. B.W.S. received support from an ANU Ph.D. scholarship and the ATNF student program.
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Space Telescope Science InstituteUNSPECIFIED
Australian National UniversityUNSPECIFIED
Australia Telescope National FacilityUNSPECIFIED
Issue or Number:6583
Record Number:CaltechAUTHORS:20150610-142631444
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Official Citation:Evidence from a processing pulsar orbit for a neutron-star birth kick 584-586 V. M. Kaspi, M. Bailes, R. N. Manchester, B. W. Stappers & J. F. Bell doi:10.1038/381584a0
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:58171
Deposited On:11 Jun 2015 04:00
Last Modified:10 Nov 2021 22:00

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