Search for Radio Pulsations from Neutron Star Candidates in Detached Binaries
Fuente:
arXiv
Saved in:
| Main Authors: | , , , , , , , , , |
|---|---|
| Format: | Preprint |
| Published: |
2025
|
| Subjects: | |
| Online Access: | |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1866917103509962752 |
|---|---|
| author | Gao, Shi-Jie Li, Xiang-Dong Wang, Song El-Badry, Kareem Zhou, De-Jiang Shao, Yi-Xuan Yan, Zhen Wang, Pei Zhou, Ping Han, Jin-Lin |
| author_facet | Gao, Shi-Jie Li, Xiang-Dong Wang, Song El-Badry, Kareem Zhou, De-Jiang Shao, Yi-Xuan Yan, Zhen Wang, Pei Zhou, Ping Han, Jin-Lin |
| contents | Recent optical astrometric and spectroscopic surveys have identified numerous neutron star (NS) candidates in non-accreting detached binary systems, but their compact-object nature remains unconfirmed. In this work, we present targeted radio observations of 31 such candidates using the Five-hundred-meter Aperture Spherical radio Telescope (FAST), the Robert C. Byrd Green Bank Telescope, and the Shanghai TianMa Radio Telescope. Over a total of 46.65 hours of observing time, we detected neither periodic nor single-pulse radio emissions. These nondetections place stringent upper limits on the flux densities of any potential radio signals, reaching ~4 $μ$Jy for periodic emission and ~10 mJy for single pulses with FAST. Since our observations are highly sensitive and the flux density upper limits are well below the median fluxes of known Galactic pulsars, this suggests that geometric beaming is the most likely explanation for the non-detections if these objects are indeed pulsars. Alternatively, the NSs may be sufficiently old ($\gtrsim$ 10 Gyr) and have become intrinsically radio-quiet. In this case, our findings highlight the inherent difficulty of confirming NSs in such old detached binary systems through radio pulsation searches. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2511_20242 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Search for Radio Pulsations from Neutron Star Candidates in Detached Binaries Gao, Shi-Jie Li, Xiang-Dong Wang, Song El-Badry, Kareem Zhou, De-Jiang Shao, Yi-Xuan Yan, Zhen Wang, Pei Zhou, Ping Han, Jin-Lin High Energy Astrophysical Phenomena Astrophysics of Galaxies Solar and Stellar Astrophysics Recent optical astrometric and spectroscopic surveys have identified numerous neutron star (NS) candidates in non-accreting detached binary systems, but their compact-object nature remains unconfirmed. In this work, we present targeted radio observations of 31 such candidates using the Five-hundred-meter Aperture Spherical radio Telescope (FAST), the Robert C. Byrd Green Bank Telescope, and the Shanghai TianMa Radio Telescope. Over a total of 46.65 hours of observing time, we detected neither periodic nor single-pulse radio emissions. These nondetections place stringent upper limits on the flux densities of any potential radio signals, reaching ~4 $μ$Jy for periodic emission and ~10 mJy for single pulses with FAST. Since our observations are highly sensitive and the flux density upper limits are well below the median fluxes of known Galactic pulsars, this suggests that geometric beaming is the most likely explanation for the non-detections if these objects are indeed pulsars. Alternatively, the NSs may be sufficiently old ($\gtrsim$ 10 Gyr) and have become intrinsically radio-quiet. In this case, our findings highlight the inherent difficulty of confirming NSs in such old detached binary systems through radio pulsation searches. |
| title | Search for Radio Pulsations from Neutron Star Candidates in Detached Binaries |
| topic | High Energy Astrophysical Phenomena Astrophysics of Galaxies Solar and Stellar Astrophysics |
| url | https://arxiv.org/abs/2511.20242 |