arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2007.13381astro-ph.EP
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用MicroObservatory观测凌日系外行星:热木星HAT-P-32 b的43个新的transit光变曲线

Observing transiting exoplanets with the MicroObservatory: 43 new transit light curves of the hot Jupiter HAT-P-32b

Martin J F Fowler, Frank F. Sienkiewicz, Robert T. Zellem, Mary E. Dussault

摘要:

本文介绍了利用微型天文台0.15米机器人望远镜网络对热木星系外行星HAT-P-32 b进行的为期7年的43次完整凌日观测。与最新的星历表的系统相比,中过境时间的精度产生了3.0分钟的预测模型的均方根值。基于EXOFAST建模的估计系统参数与NASA系外行星档案中列出的默认参数值大致一致。更新后的轨道周期为2.15000815 +/- 0.00000013天,星历为2458881.71392 +/- 0.00027 BJDTDB,这与最近使用较大望远镜对该系统的研究一致。使用这一更新的星历,NASA JWST任务在2021年年中对HAT-P-32 b进行的概念观测的预测中渡时间比发现星历提高了1.4分钟,精确度提高了约8倍。因此,微型天文台和小型望远镜的其他用户对凌日系外行星的观测可有助于维护未来天基望远镜任务的目标星历表。我们还注意到,其中一颗HAT-P-32场星是一颗δ Scuti脉动变星,并且使用与本研究相同的观测结果进行表征,进一步证明了MicroObservatory在观测恒星变率方面的实用性,同时观测凌日系外行星以进行星历维护。

英文摘要:

Observations of 43 complete transits of the hot Jupiter exoplanet HAT-P-32b using the MicroObservatory 0.15-m robotic telescope network covering a period of 7 years are presented. Compared with the most recent ephemeris for the system, the precision of the mid-transit times yielded a root-mean-square value from the predicted model of 3.0 min. The estimated system parameters based on EXOFAST modelling are broadly consistent with those of the default parameter values listed in the NASA Exoplanet Archive. An updated orbital period of 2.15000815 +/- 0.00000013 d and ephemeris of 2458881.71392 +/- 0.00027 BJDTDB is consistent with recent studies of the system using larger telescopes. Using this updated ephemeris, the predicted mid-transit time for a notional observation of HAT-P-32b by the NASA JWST mission in mid-2021 is improved by 1.4 min compared with the discovery ephemeris and is ~8 times more precise. Likewise, the mid-transit time for an observation by the ESA ARIEL mission in 2020 is improved by 1.7 min. Thus, observations of transiting exoplanets by MicroObservatory and other users of small telescopes can contribute to the maintenance of the ephemerides of targets for future space-based telescope missions. We also note that one of the HAT-P-32 field stars is a δ Scuti pulsating variable and that characterization using the same observations as this study further demonstrates the utility of MicroObservatory for the observation of stellar variability, whilst simultaneously observing transiting exoplanets for ephemeris maintenance.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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