ADS - Astro-ph
Recent articles
A search for radio pulsars around low-mass white dwarfs
Low-mass white dwarfs can either be produced in low-mass X-ray binaries by stable mass transfer to a neutron star, or in a common-envelope phase with a heavier white dwarf companion. We have searched 8 low-mass white dwarf candidates recently identified in the Sloan Digital Sky Survey for radio pulsations from pulsar companions, using the Green Bank Telescope at 340MHz. We have found no pulsations down to flux densities of 0.6-0.8 mJy/kpc^2 and conclude that a given low-mass helium-core white dwarf has a probability of < 0.18+-0.05 of being in a binary with a radio pulsar.
Phenomenology of pulsar B0809+74's rotating subbeam system II.
Building on results and analyses of previous works, the structure and polarization of B0809+74's subbeam carousel is delimited, but not fully solved. Some 8-10 subbeams are indicated for an equatorward sightline traverse and 25-40 for a polarward one. Either alternative indicates a subbeam circulation time much longer than predicted by theory. Polarized subbeam maps show complex structure and suggest that the star's polarized modes are angularly disjoint.
Arecibo and the ALFA Pulsar Survey
The recently started Arecibo L-band Feed Array (ALFA) pulsar survey aims to find ~1000 new pulsars. Due to its high time and frequency resolution the survey is especially sensitive to millisecond pulsars, which have the potential to test gravitational theories, detect gravitational waves and probe the neutron-star equation of state. Here we report the results of our preliminary analysis: in the first months we have discovered 21 new pulsars. One of these, PSR J1906+0746, is a young 144-ms pulsar in a highly relativistic 3.98-hr low-eccentricity orbit. The 2.61 +- 0.02 solar-mass system is expected to coalesce in ~300 Myr and contributes significantly to the computed cosmic inspiral rate of compact binary systems.
ALFA II: The young, highly relativistic binary pulsar J1906+0746Arecibo Pulsar Survey Using ALFA. I. Survey Strategy and First Discoveries
Intermittent nulls in PSR B0818-13, and the subpulse-drift alias mode
|V|: New insight into the circular polarization of radio pulsars
Unusual subpulse modulation in PSR B0320+39
Probing drifting and nulling mechanisms in PSR B0809+74
Null-induced mode changes in PSR B0809+74
Pulsar drifting-subpulse polarization
Conference proceedings
Arecibo and the ALFA Pulsar Survey (Urumqi, 2005)
Magnetic field decay, or just period-dependent beaming? (Sydney, 2003)
Drifting-nulling interaction in PSR B0809+74 (Crete, 2002)