DART撞击出现期内Didymos系统的测光观测
地球与行星天体物理
2023-11-06 v1
摘要
2022年9月26日，双小行星重定向测试（DART）航天器撞击了双星近地小行星（65803）Didymos的卫星Dimorphos。这通过将Dimorphos的轨道周期改变33分钟（Thomas等人，2023）证明了动能撞击器在行星防御中的有效性。测量周期变化在很大程度上依赖于一项协调的光变曲线测光活动，该活动旨在探测互事件（掩星与食）以直接探测卫星的轨道周期。在2022年7月至2023年2月的撞击出现期内，共有28台望远镜贡献了224条独立光变曲线。我们在此关注可分解的光变曲线，即那些可以从中提取互事件的曲线。我们描述了光变曲线分解的过程，并借此发布完整数据集以供未来分析。我们利用这些数据约束喷出物的撞击后演化。相对于模型的互事件测量深度表明，喷出物在撞击后约前1天内变得光学薄，随后以约25天的衰减时间 fading。系统的整体星等表明，撞击后约20天后喷出物不再贡献可测量的亮度增强。这种整体测光行为不能被HG测光模型很好地表示。HG1G2模型在很宽的相位角范围内很好地拟合了数据。最后，我们注意到至少到2023年3月都存在喷出物尾迹。其持续性意味着在DART撞击后数月内喷出物持续从系统中逃逸。
引用
@article{arxiv.2311.01971,
title = {Photometry of the Didymos system across the DART impact apparition},
author = {Nicholas Moskovitz and Cristina Thomas and Petr Pravec and Tim Lister and Tom Polakis and David Osip and Theodore Kareta and Agata Rożek and Steven R. Chesley and Shantanu P. Naidu and Peter Scheirich and William Ryan and Eileen Ryan and Brian Skiff and Colin Snodgrass and Matthew M. Knight and Andrew S. Rivkin and Nancy L. Chabot and Vova Ayvazian and Irina Belskaya and Zouhair Benkhaldoun and Daniel N. Berteşteanu and Mariangela Bonavita and Terrence H. Bressi and Melissa J. Brucker and Martin J. Burgdorf and Otabek Burkhonov and Brian Burt and Carlos Contreras and Joseph Chatelain and Young-Jun Choi and Matthew Daily and Julia de León and Kamoliddin Ergashev and Tony Farnham and Petr Fatka and Marin Ferrais and Stefan Geier and Edward Gomez and Sarah Greenstreet and Hannes Gröller and Carl Hergenrother and Carrie Holt and Kamil Hornoch and Marek Husárik and Raguli Inasaridze and Emmanuel Jehin and Elahe Khalouei and Jean-Baptiste Kikwaya Eluo and Myung-Jin Kim and Yurij Krugly and Hana Kučáková and Peter Kušnirák and Jeffrey A. Larsen and Hee-Jae Lee and Cassandra Lejoly and Javier Licandro and Penélope Longa-Peña and Ronald A. Mastaler and Curtis McCully and Hong-Kyu Moon and Nidia Morrell and Arushi Nath and Dagmara Oszkiewicz and Daniel Parrott and Liz Phillips and Marcel M. Popescu and Donald Pray and George Pantelimon Prodan and Markus Rabus and Michael T. Read and Inna Reva and Vernon Roark and Toni Santana-Ros and James V. Scotti and Taiyo Tatara and Audrey Thirouin and David Tholen and Volodymyr Troianskyi and Andrew F. Tubbiolo and Katelyn Villa},
journal= {arXiv preprint arXiv:2311.01971},
year = {2023}
}
备注
52 pages, 5 tables, 9 figures, accepted to PSJ