来自 TESS 数据的小行星旋转周期
摘要
理解小行星通过牛顿-约瑟夫森效应进行的日常演化，需要确定许多物理属性，包括旋转周期。我们提出了一种旨在稳健确定小行星旋转周期的方法，同时避免别名问题。我们将该方法应用于NASA TESS任务测量的成千上万颗小行星光度曲线。我们 developed a robust period-analysis algorithm based on a Fourier series. 我们的 approach includes a comparison of the results from multiple orders and tests on the number of extremes to identify and reject potential aliases. We also provide the uncertainty interval for the result as well as additional periods that may be plausible. We report the rotation period for 4521 asteroids within a precision of 10%. A comparison with the literature (whenever available) reveals a very good agreement and validates the approach presented here. Our approach also highlights cases for which the determination of the period should be considered invalid. The dataset presented here confirms the apparent small number of asteroids with a rotation between 50 and 100 h and correlated with diameter. The amplitude of the light curves is found to increase toward smaller diameters, as asteroids become less and less spherical. Finally, there is a systematic difference between the broad C and S complex in the amplitude-period, revealing the statistically lower density of C-types compared to S-type asteroids. Conclusions. Our approach to the determination of asteroid rotation period is based on simple concepts, yet it is nonetheless robust. It can be applied to large corpora of time series photometry, such as those extracted from exoplanet transit surveys.
引用
@article{arxiv.2501.07187,
title = {Real-time Mode-Aware Dataflow: A Dataflow Model to Specify and Analyze Mode-dependent CPSs under Relaxed Timing Constraints},
author = {Guillaume Roumage and Selma Azaiez and Cyril Faure and Stéphane Louise},
journal= {arXiv preprint arXiv:2501.07187},
year = {2025}
}