计划性撞击小行星后的抛射物演化：前五个星期
地球与行星天体物理
2023-10-19 v1
摘要
DART航天器对小行星Didymos的卫星Dimorphos的撞击显著改变了Dimorphos的轨道，主要源于物质的抛射。我们呈现了全球 campaign 中十二个地基设施的结果，该 campaign 旨在监测撞击后前35天内抛射物的亮度和形态。在初始增亮约1.4星等后，我们发现第一周内一致的变暗速率为0.11–0.12星等/天，整个研究期内为0.08–0.09星等/天。系统在撞击后24.3–25.3天恢复到撞击前亮度，尽管主抛射尾仍然存在。变暗在撞击后第八天短暂暂停，时间上接近第二尾的出现。这很可能是由于初始撞击中释放的巨砾再撞击后物质的二次释放所致，不过主抛射物穿过孔径的运动可能也起了作用。
引用
@article{arxiv.2310.12089,
title = {Ejecta Evolution Following a Planned Impact into an Asteroid: The First Five Weeks},
author = {Theodore Kareta and Cristina Thomas and Jian-Yang Li and Matthew M. Knight and Nicholas Moskovitz and Agata Rozek and Michele T. Bannister and Simone Ieva and Colin Snodgrass and Petr Pravec and Eileen V. Ryan and William H. Ryan and Eugene G. Fahnestock and Andrew S. Rivkin and Nancy Chabot and Alan Fitzsimmons and David Osip and Tim Lister and Gal Sarid and Masatoshi Hirabayashi and Tony Farnham and Gonzalo Tancredi and Patrick Michel and Richard Wainscoat and Rob Weryk and Bonnie Burrati and Jana Pittichova and Ryan Ridden-Harper and Nicole J. Tan and Paul Tristram and Tyler Brown and Mariangela Bonavita and Martin Burgdorf and Elahe Khalouei and Penelope Longa and Markus Rabus and Sedighe Sajadian and Uffe Graae Jorgensen and Martin Dominik and Jean-Baptiste Kikwaya and Elena Mazzotta Epifani and Elisabetta Dotto and J. D. Prasanna Deshapriya and Pedro H. Hasselmann and Massimo Dall'Ora and Lyu Abe and Tristan Guillot and Djamel Mekarnia and Abdelkrim Agabi and Philippe Bendjoya and Olga Suarez and Amaury Triaud and Thomas Gasparetto and Maximillian N. Gunther and Michael Kueppers and Bruno Merin and Joseph Chatelain and Edward Gomez and Helen Usher and Cai Stoddard-Jones and Matthew Bartnik and Michael Bellaver and Brenna Chetan and Emma Dugan and Tori Fallon and Jeremy Fedewa and Caitlyn Gerhard and Seth A. Jacobson and Shane Painter and David-Michael Peterson and Joseph E. Rodriguez and Cody Smith and Kirill V. Sokolovsky and Hannah Sullivan and Kate Townley and Sarah Watson and Levi Webb and Josep M. Trigo-Rodrıguez and Josep M. Llenas and Ignacio Perez-Garcıa and A. J. Castro-Tirado and Jean-Baptiste Vincent and Alessandra Migliorini and Monica Lazzarin and Fiorangela La Forgia and Fabio Ferrari and Tom Polakis and Brian Skiff},
journal= {arXiv preprint arXiv:2310.12089},
year = {2023}
}
备注
16 pages, 5 Figures, accepted in the Astrophysical Journal Letters (ApJL) on October 16, 2023