Study of eclipses for Redback pulsar J1227$-$4853
Sanjay Kudale, Jayanta Roy, Bhaswati Bhattacharyya, Ben Stappers and, Jayaram Chengalur

TL;DR
This study investigates the eclipse properties of the redback millisecond pulsar J1227-4853 across multiple frequencies, revealing eclipse durations, electron densities, and flux variations, suggesting cyclotron absorption and plasma blobs as causes.
Contribution
It provides detailed measurements of eclipse durations, electron densities, and flux fading, proposing a new explanation involving plasma blobs from mass loss at L2 point.
Findings
Eclipses last about 37% of the orbit at 607 MHz.
Electron column density at eclipse boundaries is approximately 24.4 x 10^{16} cm^{-2}.
Flux fading near inferior conjunction suggests plasma blob absorption.
Abstract
We present a multi-frequency study of eclipse properties of a transitional redback millisecond pulsar J12274853 discovered in 2014 with the GMRT. Emission from this pulsar is eclipsed at 607 MHz for about 37% of its orbit around the superior conjunction. We observe eclipse ingress and egress transition which last 12% and 15% of its orbit respectively, resulting in only 36% of the orbit being unaffected by eclipsing material. We report an excess dispersion measure (DM) at eclipse boundaries of 0.079(3) pc cm and the corresponding electron column density (N) is 24.4(8) x 10 cm. Simultaneous timing and imaging studies suggests that the eclipses in J12274853 are not caused by temporal smearing due to excess dispersion and scattering but could be caused by removal of pulsar flux due to cyclotron absorption of the pulsed signal by intra-binary material…
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