On the effect of pulsar evaporation on the cooling of white dwarfs

Author:

Tang Wenshi1,Li Xiang-Dong12

Affiliation:

1. School of Astronomy and Space Science, Nanjing University, Nanjing 210023, China

2. Key Laboratory of Modern Astronomy and Astrophysics (Nanjing University), Ministry of Education, Nanjing 210023, China

Abstract

ABSTRACT Evolution of a large part of low-mass X-ray binaries (LMXBs) leads to the formation of rapidly rotating pulsars with a helium white dwarf (He WD) companion. Observations indicate that some He WDs in binary pulsar systems are ultracool (with the effective temperatures Teff ≲ 4000 K). It is hard to cool down a He WD to such low temperatures within the Hubble time because a thick hydrogen envelope was left behind around the He core after the mass transfer process. A possible mechanism that can accelerate the WD cooling is the evaporative wind mass-loss from the He WD driven by the high-energy radiation from the recycled pulsar. In this paper, we evolve a large number of LMXBs and investigate the influence of the pulsar’s high-energy radiation on the WD cooling with different input parameters, including the neutron star’s spin-down luminosity, the evaporation efficiency, and the metallicity of the companion star. By comparing our results with observations we note that, for relatively hot He WDs (with Teff > 7000 K), standard WD cooling without evaporation considered is able to reproduce their temperatures, while evaporation is probably required for the He WDs with relatively low temperatures (Teff < 5000 K).

Funder

National Key Research and Development Program of China

Natural Science Foundation of China

Publisher

Oxford University Press (OUP)

Subject

Space and Planetary Science,Astronomy and Astrophysics

Cited by 2 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

1. ELM of ELM-WD: An Extremely-low-mass Hot Star Discovered in LAMOST Survey;The Astronomical Journal;2023-02-21

2. Ultracompact X-ray binaries with He star companions;Monthly Notices of the Royal Astronomical Society;2021-07-21

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