The implications of a companion enhanced wind on millisecond pulsar production

Abstract

The most frequently seen binary companions to millisecond pulsars (MSPs) are helium white dwarfs (He WDs). The standard rejuvenation mechanism, in which a low- to intermediate-mass companion to a neutron star fills its Roche lobe between central hydrogen exhaustion and core helium ignition, is the most plausible formation mechanism. We have investigated whether the observed population can realistically be formed via this mechanism. We used the Cambridge STARS code to make models of Case B RLOF with Reimers' mass loss from the donor. We find that the range of initial orbital periods required to produce the currently observed range of orbital periods of MSPs is extremely narrow. To reduce this fine tuning, we introduce a companion enhanced wind (CEW) that strips the donor of its envelope more quickly so that systems can detach at shorter periods. Our models indicate that the fine tuning can be significantly reduced if a CEW is active. Because significant mass is lost owing to a CEW we expect some binary pulsars to accrete less than the 0.1Msun needed to spin them up to millisecond periods. This can account for mildly recycled pulsars present along the entire Mc-Porb relation. Systems with Pspin > 30ms are consistent with this but too few of these mildly recycled pulsars have yet been observed to make a significant comparison.

arXiv comment10 pages, 9 figures

References in corpus (19)

• A Massive Pulsar in a Compact Relativistic Binary
• The ATNF Pulsar Catalogue
• The ATNF Pulsar Catalogue
• Low Temperature Opacities
• Common Envelope Evolution: Where we stand and how we can move forward
• Approximate input physics for stellar modelling
• The Parkes multibeam pulsar survey: VI. Discovery and timing of 142 pulsars and a Galactic population analysis
• Precision timing of PSR J0437-4715: an accurate pulsar distance, a high pulsar mass and a limit on the variation of Newton's gravitational constant
• Modelling the binary progenitor of supernova 1993J
• Further Evidence for the Bimodal Distribution of Neutron Star Masses
• Masses, Parallax, and Relativistic Timing of the PSR J1713+0747 Binary System
• High-Precision Timing of 5 Millisecond Pulsars: Space Velocities, Binary Evolution and Equivalence Principles
• Discovery of Five Binary Radio Pulsars
• Einstein@Home Discovery of 24 Pulsars in the Parkes Multi-beam Pulsar Survey
• The birth properties of Galactic millisecond radio pulsars
• Recycled Pulsars Discovered at High Radio Frequency
• Formation of Millisecond Pulsars with Low-Mass Helium White Dwarf Companions in Very Compact Binaries
• The Nature of Millisecond Pulsars with Helium White Dwarf Companions
• Long-term timing of four millisecond pulsars

Cited by in corpus (3)

• On the formation of neutron stars via accretion-induced collapse in binaries
• The formation of neutron star systems through accretion-induced collapse in white-dwarf binaries
• Formation of Extremely Low-mass White Dwarfs Binaries