Evolution of LMXBs under Different Magnetic Braking Prescriptions

Abstract

Magnetic braking (MB) likely plays a vital role in the evolution of low-mass X-ray binaries (LMXBs). However, it is still uncertain about the physics of MB, and there are various proposed scenarios for MB in the literature. To examine and discriminate the efficiency of MB, we investigate the LMXB evolution with five proposed MB laws. Combining detailed binary evolution calculation with binary population synthesis, we obtain the expected properties of LMXBs and their descendants binary millisecond pulsars. We then discuss the strength and weakness of each MB law by comparing the calculated results with observations. We conclude that the $\tau$-boosted MB law seems to best match the observational characteristics.

30 pages, 9 figures, 3 tables, accepted for publication in ApJ

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• Convection and rotation boosted prescription of magnetic braking: application to the formation of extremely low-mass white dwarfs
• Compact Objects in close orbits as Gravitational Wave Sources: Formation Scenarios and Properties
• A short review of the pulsar magnetic inclination angles (II)
• Anomalous orbital expansion of low-mass X-ray binary 2A 1822-371: the existence of a circumbinary disk?
• Convective dynamos of black widow companions
• Investigation of individual pulse emission behaviours from pulsar J1741$-$0840
• Period Variation Rates of Four Radial Single-Mode High-Amplitude Delta Scuti Stars