Nii: a Bayesian orbit retrieval code applied to differential astrometry
Nii: a Bayesian orbit retrieval code applied to differential astrometry
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Nii:应用于微分天体测量的贝叶斯轨道检索代码
DOI:
10.1093/mnras/stab3317
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发表时间:
2022
期刊:
影响因子:
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通讯作者:
Jianghui Ji
中科院分区:
文献类型:
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作者:
Sheng Jin;Xiaojian Ding;Su Wang;Yao Dong;Jianghui Ji
Here we present an open source Python-based Bayesian orbit retrieval code (Nii) that implements an automatic parallel tempering Markov chain Monte Carlo (APT-MCMC) strategy. Nii provides a module to simulate the observations of a space-based astrometry mission in the search for exoplanets, a signal extraction process for differential astrometric measurements using multiple reference stars, and an orbital parameter retrieval framework using APT-MCMC. We further verify the orbit retrieval ability of the code through two examples corresponding to a single-planet system and a dual-planet system. In both cases, efficient convergence on the posterior probability distribution can be achieved. Although this code specifically focuses on the orbital parameter retrieval problem of differential astrometry, Nii can also be widely used in other Bayesian analysis applications.