首页|The Influence of Different Solar System Planetary Ephemerides on Pulsar Timing

The Influence of Different Solar System Planetary Ephemerides on Pulsar Timing

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Pulsar timing offers a comprehensive avenue for exploring diverse topics in physics and astrophysics.High-precision solar system planetary ephemeris is crucial for pulsar timing as it provides the positions and velocities of solar system planets including the Earth.However,it is inevitable that inherent inconsistencies exist in these ephemerides.Differences between various ephemerides can significantly impact pulsar timing and parameter estimations.Currently,pulsar timing highly depends on the JPL DE ephemeris,for instance,the Pulsar Timing Array data analysis predominantly utilizes DE436.In this study,we examine inconsistencies across various ephemeris series,including JPL DE,EPM,and INPOP.Notably,discrepancies emerge particularly between the current ephemeris DE436 and the earliest released ephemeris DE200,as well as the most recent ephemerides,e.g.,DE440,INPOP21A,and EPM2021.Further detailed analysis of the effects of ephemeris on geometric correction procedures for the conversion of measured topocentric times of arrival is presented in this study.Our researches reveal that variations in the Roemer delays across different ephemerides lead to distinct differences.The timing residuals and the fact that these discrepancies can be readily incorporated into the subsequent pulsar parameters,leading to inconsistent fitting estimates,suggest that the influence of errors in the ephemeris on the timing process might currently be underappreciated.

(stars:)pulsars:generalPlanetary Systemstimeephemerides

Jian-Peng Dai、Wei Han、Na Wang

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School of Physical Science and Technology,Xinjiang University,Urumqi 830046,China

Xinjiang Astronomical Observatory,Chinese Academy of Sciences,Urumqi 830011,China

University of Chinese Academy of Sciences,Beijing 100049,China

Xinjiang Key Laboratory of Radio Astrophysics,Urumqi 830011,China

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Chinese Academy of Sciences(CAS)"Light of West China"ProgramTianshan talents programNational Natural Science Foundation of China(NSFC)Major Science and Technology Program of Xinjiang Uygur Autonomous Region

2023TSYCTD0013122881022022A03013-3

2024

10.1088/1674-4527/ad484e

天文和天体物理学研究
中国科学院国家天文台

天文和天体物理学研究

CSTPCD
影响因子：0.406
ISSN：1674-4527
年,卷(期)：2024.24(8)