FAST Discovery of PSR J1928+1815 in the GPPS survey --- A binary system of a pulsar and a helium star
The PSR J1928+1815 binary system consists of a pulsar and a probably helium star companion.
It is an interesting new binary pulsar of a type that is so far unique.
The system is highly compact, with a millisecond pulsar, a likely Helium star companion, and regular eclipses of the pulsed radio emission.
The compactness of the orbit, and the high-mass of the companion star, imply that the system likely passed through a common envelope stage.
Systems like this are likely extremely rare in the Galaxy.
Fig.1: The polarization pulse profile data of PSR J1928+1815, integrated over 14-hour observations by FAST (get data here!).
Fig.2: The three long FAST observations carried out on 2021 March 13, 2021 April 5, and 2023 December 18. Eclipses appear in the orbit-phase range of 0.25 near the conjunction with a duration of about 17 percent of the orbit period, which indicates that the companion of PSR J1928+1815 is not a massive white dwarf or a neutron star.
Fig.3: The geometry for PSR J1928+1815 binary.
Data release
| Obs. Date (yyyymmdd) |
FAST Beam Name |
Obs. Length (min) |
Orbital phase |
Data yhz25dat.tar.gz |
| 20200531 | G53.48+0.51M05P3 | 5 | 0.36 to 0.38 | ar.tar.gz |
| 20200810 | J1928+1816M01 | 15 | 0.71 to 0.77 | ar.tar.gz |
| 20200828 | J1928+1816M01 | 15 | 0.72 to 0.79 | ar.tar.gz |
| 20200910 | J1928+1816M01 | 15 | 0.40 to 0.47 | ar.tar.gz |
| 20201001 | J1928+1816M01 | 15 | 0.23 to 0.30 | ar.tar.gz |
| 20201106 | J1928+1816M01 | 15 | 0.76 to 0.83 | ar.tar.gz |
| 20201228 | J1928+1816M01 | 20 | 0.94 to 1.04 | ar.tar.gz |
| 20201228 | J1928+1816M01 | 20 | 0.64 to 0.73 | ar.tar.gz |
| 20201231 | J1928+1816M01 | 20 | 0.17 to 0.27 | ar.tar.gz |
| 20201231 | J1928+1816M01 | 20 | 0.59 to 0.68 | ar.tar.gz |
| 20210218 | J1928+1816M01 | 15 | 0.64 to 0.71 | ar.tar.gz |
| 20210313 | J192810+181632M01 | 168 | 0.84 to 1.62 | ar.tar.gz |
| 20210313 | J192810+181632M01 | 14 | 0.66 to 0.73 | ar.tar.gz |
| 20210405 | J192810+181632M01 | 240 | 0.81 to 1.93 | ar.tar.gz |
| 20210713 | J192810+181632gbM01 | 15 | 0.37 to 0.44 | ar.tar.gz |
| 20210825 | J1928+1816M01 | 15 | 0.82 to 0.88 | ar.tar.gz |
| 20211008 | J1928+1816M01 | 15 | 0.62 to 0.68 | ar.tar.gz |
| 20211114 | J192810+181632gbM01 | 15 | 0.98 to 1.05 | ar.tar.gz |
| 20211213 | J1928+1816M01 | 15 | 0.76 to 0.83 | ar.tar.gz |
| 20220217 | J1928+1816M01 | 15 | 0.10 to 0.17 | ar.tar.gz |
| 20220328 | J1928+1816M01 | 15 | 0.21 to 0.28 | ar.tar.gz |
| 20220509 | J1928+1816M01 | 15 | 0.00 to 0.07 | ar.tar.gz |
| 20220605 | J1928+1816M01 | 15 | 0.69 to 0.76 | ar.tar.gz |
| 20230623 | J1928+1816M01 | 15 | 0.88 to 0.94 | ar.tar.gz |
| 20231106 | J1928+1816M01 | 15 | 0.74 to 0.81 | ar.tar.gz |
| 20231218 | J1928+1816M01 | 156 | 0.65 to 1.37 | ar.tar.gz |
| 20241224 | J1928+1816M01 | 5 | 0.47 to 0.49 | ar.tar.gz |
If you want to get more information, you are welcome to contact authors: zlyang or hjl @ nao.cas.cn
Please do cite properly to
Z. L. Yang et al, 2025, A pulsar-helium star compact binary system formed by common envelope evolution, Science
(Published PDF )
(ZLYang & JLHan @ 2025-03-13)