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QPOs and orbital elements of X-ray binary 4U 0115+63 during the 2017 outburst observed by Insight-HXMT
Ding, Y. Z.; Wang, W.; Zhang, P.; Bu, Q. C.; Cai, C.; Cao, X. L.; Zhi, C.; Chen, L.; Chen, T. X.; Chen, Y. B.; Chen, Y.; Chen, Y. P.; Cui, W. W.; Du, Y. Y.; Gao, G. H.; Gao, H.; Ge, M. Y.; Gu, Y. D.; Guan, J.; Guo, C. C.; Han, D. W.; Huang, Y.; Huo, J.; Jia, S. M.; Jiang, W. C.; Jin, J.; Kong, L. D.; Li, B.; Li, C. K.; Li, G.; Li, T. P.; Li, W.; Li, X.; Li, X. B.; Li, X. F.; Li, Z. W.; Liang, X. H.; Liao, J. Y.; Liu, B. S.; Liu, C. Z.; Liu, H. X.; Liu, H. W.; Liu, X. J.; Lu, F. J.; Lu, X. F.; Lou, Q.; Luo, T.; Ma, R. C.; Ma, X.; Meng, B.; Nang, Y.; Nie, J. Y.; Qu, J. L.; Ren, X. Q.; Sai, N.; Song, L. M.; Song, X. Y.; Sun, L.; Tan, Y.; Tao, L.; Tuo, Y. L.; Wang, C.; Wang, L. J.; Wang, P. J.; Wang, W. S.; Wang, Y. S.; Wen, X. Y.; Wu, B. Y.; Wu, B. B.; Wu, M.; Xiao, G. C.; Xiao, S.; Xiong, S. L.; Xu, Y. P.; Yang, R. J.; Yang, S.; Yang, Y. J.; Yi, Q. B.; Yin, Q. Q.; You, Y.; Zhang, F.; Zhang, H. M.; Zhang, J.; Zhang, P.; Zhang, S.; Zhang, S. N.; Zhang, W. C.; Zhang, W.; Zhang, Y. F.; Zhang, Y. H.; Zhao, H. S.; Zhao, X. F.; Zheng, S. J.; Zheng, Y. G.; Zhou, D. K.
Source PublicationMonthly Notices of the Royal Astronomical Society
SubtypeJournal Article

In this paper, we presented a detailed timing analysis of a prominent outburst of 4U 0115+63 detected by Insight-HXMT in 2017 August. The spin period of the neutron star was determined to be 3.613 98 ± 0.000 02 s at MJD 57978. We measured the period variability and extract the orbital elements of the binary system. The angle of periastron evolved with a rate of $0.048^\circ \pm 0.003^\circ \rm \, yr^{-1}$ . The light curves are folded to sketch the pulse profiles in different energy ranges. A multipeak structure in 1-10 keV is clearly illustrated. We introduced wavelet analysis into our data analysis procedures to study quasi-periodic oscillation (QPO) signals and perform a detailed wavelet analysis in many different energy ranges. Through the wavelet spectra, we report the discovery of a QPO at the frequency of ∼10 mHz. In addition, the X-ray light curves showed multiple QPOs in the period of ∼16-32 and ∼67-200 s. We found that the ∼100 s QPO was significant in most of the observations and energies. There exist positive relations between X-ray luminosity and their Q-factors and S-factors, while the QPO periods have no correlation with X-ray luminosity. In wavelet phase maps, we found that the pulse phase of ∼67-200 s QPO is drifting frequently while that of ∼16-32 s QPO is scarcely drifting. The dissipation of oscillations from high energy to low energy was also observed. These features of QPOs in 4U 0115+63 provide a new challenge to our understanding of their physical origins.

Keywordstars: individual: 4U 0115+63 X-rays: binaries X-rays: stars Astrophysics - High Energy Astrophysical Phenomena
WOS IDWOS:000649001600095
ADS Bibcode2021MNRAS.503.6045D
ADS URLhttps://ui.adsabs.harvard.edu/abs/2021MNRAS.503.6045D
Citation statistics
Cited Times:7 [ADS]
Document Type期刊论文
Recommended Citation
GB/T 7714
Ding, Y. Z.,Wang, W.,Zhang, P.,et al. QPOs and orbital elements of X-ray binary 4U 0115+63 during the 2017 outburst observed by Insight-HXMT[J]. Monthly Notices of the Royal Astronomical Society,2021,503:6045.
APA Ding, Y. Z..,Wang, W..,Zhang, P..,Bu, Q. C..,Cai, C..,...&Zhou, D. K..(2021).QPOs and orbital elements of X-ray binary 4U 0115+63 during the 2017 outburst observed by Insight-HXMT.Monthly Notices of the Royal Astronomical Society,503,6045.
MLA Ding, Y. Z.,et al."QPOs and orbital elements of X-ray binary 4U 0115+63 during the 2017 outburst observed by Insight-HXMT".Monthly Notices of the Royal Astronomical Society 503(2021):6045.
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