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Ejecta Evolution Following a Planned Impact into an Asteroid: The First Five Weeks

2023; IOP Publishing; Volume: 959; Issue: 1 Linguagem: Inglês

10.3847/2041-8213/ad0fdd

2041-8213

Theodore Kareta, Cristina A. Thomas, Jian‐Yang Li, Matthew M. Knight, Nicholas Moskovitz, Agata Rożek, Michele T. Bannister, Simone Ieva, C. Snodgrass, Petr Pravec, E. V. Ryan, W. H. Ryan, Eugene G. Fahnestock, A. S. Rivkin, N. L. Chabot, A. Fitzsimmons, D. J. Osip, Tim Lister, Gal Sarid, Masatoshi Hirabayashi, T. L. Farnham, G. Tancredi, Patrick Michel, R. J. Wainscoat, Rob Weryk, Bonnie Burrati, J. Pittichová, Ryan Ridden-Harper, Nicole J. Tan, P. J. Tristram, Tyler F. M. Brown, M. Bonavita, M. Burgdorf, Elahe Khalouei, Penelope Longa, M. Rabus, Sedighe Sajadian, Uffe Graae Jørgensen, M. Dominik, J. B. Kikwaya, E. Mazzotta Epifani, E. Dotto, Prasanna Deshapriya, P. H. Hasselmann, M. Dall’Ora, Lyu Abe, T. Guillot, D. Mékarnia, A. Agabi, Philippe Bendjoya, Olga Suárez, A. H. M. J. Triaud, T Gasparetto, Maximillian N. Günther, M. Kueppers, B. Merín, Joseph Chatelain, Edward Gomez, Helen Usher, Cai Stoddard-Jones, Matthew Bartnik, Michael Bellaver, Brenna Chetan, Emma Dugan, Tori Fallon, Jeremy Fedewa, Caitlyn Gerhard, Seth A. Jacobson, Shane Painter, D. Peterson, Joseph E. Rodriguez, Cody Smith, K. V. Sokolovsky, Hannah Sullivan, Kate Townley, Sarah Watson, Levi Webb, J. M. Trigo‐Rodríguez, Josep M. Llenas, Ignacio Pérez-García, A. J. Castro‐Tirado, Jean‐Baptiste Vincent, A. Migliorini, M. Lazzarin, F. La Forgia, Fabio Ferrari, Tom Polakis, B. A. Skiff,

Gamma-ray bursts and supernovae

Abstract The impact of the Double Asteroid Redirection Test spacecraft into Dimorphos, moon of the asteroid Didymos, changed Dimorphos’s orbit substantially, largely from the ejection of material. We present results from 12 Earth-based facilities involved in a world-wide campaign to monitor the brightness and morphology of the ejecta in the first 35 days after impact. After an initial brightening of ∼1.4 mag, we find consistent dimming rates of 0.11–0.12 mag day −1 in the first week, and 0.08–0.09 mag day −1 over the entire study period. The system returned to its pre-impact brightness 24.3–25.3 days after impact though the primary ejecta tail remained. The dimming paused briefly eight days after impact, near in time to the appearance of the second tail. This was likely due to a secondary release of material after re-impact of a boulder released in the initial impact, though movement of the primary ejecta through the aperture likely played a role.