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The eclipses of the black widow pulsar J1810+1744 at low radio frequencies

Published online by Cambridge University Press:  04 June 2018

Elliott J. Polzin ,
Rene P. Breton ,
Ben W. Stappers  and
the LOFAR PWG
Elliott J. Polzin
Affiliation:
Jodrell Bank Centre for Astrophysics, School of Physics and Astronomy, The University of Manchester, Manchester M13 9PL, UK email: [email protected]
Rene P. Breton
Affiliation:
Jodrell Bank Centre for Astrophysics, School of Physics and Astronomy, The University of Manchester, Manchester M13 9PL, UK email: [email protected]
Ben W. Stappers
Affiliation:
Jodrell Bank Centre for Astrophysics, School of Physics and Astronomy, The University of Manchester, Manchester M13 9PL, UK email: [email protected]
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Abstract

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Here we present a study of the radio frequency eclipses of the black widow pulsar J1810+1744 at low frequencies, where we are most sensitive to small deviations in the effects of material along the line of sight. Utilising the simultaneous dual beamforming and interferometric (imaging) mode of LOFAR High Band Antenna, pulsar flux variations throughout the orbit are compared for the two observing techniques to test for the presence of scattering and absorption at eclipse orbital phases. Dispersion measure and scattering variations are used as a sensitive probe into outermost edges of the eclipsing material surrounding the companion star. We find the eclipsing medium to be variable on timescales shorter than the 3.6 hr orbital period, and propose cyclotron-synchrotron absorption as the most likely primary eclipse mechanism.

Keywords

(stars:) pulsars: individual (J1810+1744)eclipses(stars:) binaries: eclipsingscatteringplasmas
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 13 , Symposium S337: Pulsar Astrophysics the Next Fifty Years , September 2017 , pp. 396 - 397
Copyright
Copyright © International Astronomical Union 2018 

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