2026-10-11T21:47:58Z https://www.scidb.cn/oai

10.57760/sciencedb.40400 2026-06-18T10:33:41Z

2026-06-18 Scintillation of the first-known pulsar planetary system doi:10.57760/sciencedb.40400 en We present a scintillation study of the first-known pulsar planetary system, PSR B1257+12, using the Five-hundred-meter Aperture Spherical radio Telescope (FAST). A total of 31 observations with durations greater than or equal to 30 minutes were analyzed. For 14 longer observations (greater than or equal to 120 minutes), one-dimensional autocorrelation function analyses yielded the scintil- lation timescale, scintillation bandwidth, and frequency-drift rate for 12 epochs. Two observations show strong periodic modulation in the frequency-domain auto-correlation function, likely caused by astronomical-unit-scale structures along the propagation path, preventing reliable measurements of the scintillation timescale and bandwidth. In three observations, secondary spectra reveal simultane- ous detections of inner, middle, and outer arcs. Analysis of the annual modulation of the inner-arc curvature indicates isotropic scattering, with a screen distance of 233 ± 28 pc and transverse velocity Vscr,α = −7.16 ± 2.16 km s−1, Vscr,δ = −41.07 ± 5.69 km s−1. Delay-profile analysis for both the inner and outer arcs suggest spectral exponents consistent with, or smaller than, the Kolmogorov value. Un- der isotropic scattering, the screen–pulsar distances are 354 ± 22 pc and 166 ± 12 pc for the middle and outer arcs. Combining the results from long-term timing analyses with our scintillation measurements, we find that the dispersion measure (DM) variations are primarily dominated by plasma located further away from the pulsar. The low DM-change rate of the outer arc and the absence of nearby scattering screens suggest that the immediate environment of the pulsar may be relatively clean. Alternatively, scattering screens closer to the pulsar may exist but remain undetected, requiring higher-sensitivity or longer-duration observations. pulsar; scintillation; planetary 姚菊枚 PUBLIC https://creativecommons.org/licenses/by/4.0/ dataset http://www.doi.org/10.3847/1538-4357/ae7f14 Science Data Bank