Abstract
We analytically compute the effects that a mass variation rate \dot M/M of a pulsar may have on the changes Δτin the times of arrival of its pulses due to test particle companions, and on their orbital dynamics. We apply our results to the planetary system of the PSR B1257+12 pulsar, located in the Galaxy at 600 pc from us, to phenomenologically constrain a putative accretion of non-annihilating dark matter on the hosting neutron star. (Abridged)
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