A pulsar-helium star compact binary system formed by common envelope evolution
Z.L.Yang, J.L.Han, D.J.Zhou, W.C.Jing, W.C.Chen, T. Wang, X. D. Li, S. Wang, B. Wang, H. W. Ge, Y. L. Guo, L. H. Li, Y. Shao, J. F. Liu, W. Q. Su, L. G. Hou, W. J. Huang, J. C. Jiang, P. Jiang, J. H. Sun, B. J. Wang, C. Wang, H. G. Wang, J. B. Wang, N. Wang, P. F. Wang
TL;DR
This paper reports the discovery of a pulsar-helium star binary system likely formed through a recent common envelope phase, providing insights into binary evolution and stellar interactions.
Contribution
It presents the first radio timing detection of a pulsar in a compact binary with a likely helium star companion formed by common envelope evolution.
Findings
Pulsar PSR J1928+1815 has a 10.55 ms spin period.
The binary system has a 3.60-hour orbital period.
The companion is a stripped helium star of 1.0-1.6 solar masses.
Abstract
A stellar common envelope occurs in a binary system when the atmosphere of an evolving star expands to encompass an orbiting companion object. Such systems are predicted to evolve rapidly, ejecting the stellar envelope and leaving the companion in a tighter orbit around a stripped star. We used radio timing to identify a pulsar, PSR J1928+1815, with a spin period of 10.55 ms in a compact binary system with an orbital period of 3.60 hours. The companion star has 1.0 to 1.6 solar masses, eclipses the pulsar for about 17% of the orbit, and is undetected at other wavelengths, so it is most likely a stripped helium star. We interpret this system as having recently undergone a common envelope phase, producing a compact binary.
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