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Physical properties of asteroid Dimorphos as derived from the DART impact

Fuente: arXiv

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Auteurs principaux:	Raducan, S. D., Jutzi, M., Cheng, A. F., Zhang, Y., Barnouin, O., Collins, G. S., Daly, R. T., Davison, T. M., Ernst, C. M., Farnham, T. L., Ferrari, F., Hirabayashi, M., Kumamoto, K. M., Michel, P., Murdoch, N., Nakano, R., Pajola, M., Rossi, A., Agrusa, H. F., Barbee, B. W., Syal, M. Bruck, Chabot, N. L., Dotto, E., Fahnestock, E. G., Hasselmann, P. H., Herreros, I., Ivanovski, S., Li, J. -Y., Lucchetti, A., Luther, R., Ormö, J., Owen, M., Pravec, P., Rivkin, A. S., Robin, C. Q., Sánchez, P., Tusberti, F., Wünnemann, K., Zinzi, A., Epifani, E. Mazzotta, Manzoni, C., May, B. H.
Format:	Preprint
Publié:	2024
Sujets:	Earth and Planetary Astrophysics
Accès en ligne:	Acceder al recurso
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_version_	1866909125298880512
author	Raducan, S. D. Jutzi, M. Cheng, A. F. Zhang, Y. Barnouin, O. Collins, G. S. Daly, R. T. Davison, T. M. Ernst, C. M. Farnham, T. L. Ferrari, F. Hirabayashi, M. Kumamoto, K. M. Michel, P. Murdoch, N. Nakano, R. Pajola, M. Rossi, A. Agrusa, H. F. Barbee, B. W. Syal, M. Bruck Chabot, N. L. Dotto, E. Fahnestock, E. G. Hasselmann, P. H. Herreros, I. Ivanovski, S. Li, J. -Y. Lucchetti, A. Luther, R. Ormö, J. Owen, M. Pravec, P. Rivkin, A. S. Robin, C. Q. Sánchez, P. Tusberti, F. Wünnemann, K. Zinzi, A. Epifani, E. Mazzotta Manzoni, C. May, B. H.
author_facet	Raducan, S. D. Jutzi, M. Cheng, A. F. Zhang, Y. Barnouin, O. Collins, G. S. Daly, R. T. Davison, T. M. Ernst, C. M. Farnham, T. L. Ferrari, F. Hirabayashi, M. Kumamoto, K. M. Michel, P. Murdoch, N. Nakano, R. Pajola, M. Rossi, A. Agrusa, H. F. Barbee, B. W. Syal, M. Bruck Chabot, N. L. Dotto, E. Fahnestock, E. G. Hasselmann, P. H. Herreros, I. Ivanovski, S. Li, J. -Y. Lucchetti, A. Luther, R. Ormö, J. Owen, M. Pravec, P. Rivkin, A. S. Robin, C. Q. Sánchez, P. Tusberti, F. Wünnemann, K. Zinzi, A. Epifani, E. Mazzotta Manzoni, C. May, B. H.
contents	On September 26, 2022, NASA's Double Asteroid Redirection Test (DART) mission successfully impacted Dimorphos, the natural satellite of the binary near-Earth asteroid (65803) Didymos. Numerical simulations of the impact provide a means to explore target surface material properties and structures, consistent with the observed momentum deflection efficiency, ejecta cone geometry, and ejected mass. Our simulation, which best matches observations, indicates that Dimorphos is weak, with a cohesive strength of less than a few pascals (Pa), similar to asteroids (162173) Ryugu and (101955) Bennu. We find that a bulk density of Dimorphos, rhoB, lower than 2400 kg/m3, and a low volume fraction of boulders (<40 vol%) on the surface and in the shallow subsurface, are consistent with measured data from the DART experiment. These findings suggest Dimorphos is a rubble pile that might have formed through rotational mass shedding and re-accumulation from Didymos. Our simulations indicate that the DART impact caused global deformation and resurfacing of Dimorphos. ESA's upcoming Hera mission may find a re-shaped asteroid, rather than a well-defined crater.
format	Preprint
id	arxiv_https___arxiv_org_abs_2403_00667
institution	arXiv
publishDate	2024
record_format	arxiv
spellingShingle	Physical properties of asteroid Dimorphos as derived from the DART impact Raducan, S. D. Jutzi, M. Cheng, A. F. Zhang, Y. Barnouin, O. Collins, G. S. Daly, R. T. Davison, T. M. Ernst, C. M. Farnham, T. L. Ferrari, F. Hirabayashi, M. Kumamoto, K. M. Michel, P. Murdoch, N. Nakano, R. Pajola, M. Rossi, A. Agrusa, H. F. Barbee, B. W. Syal, M. Bruck Chabot, N. L. Dotto, E. Fahnestock, E. G. Hasselmann, P. H. Herreros, I. Ivanovski, S. Li, J. -Y. Lucchetti, A. Luther, R. Ormö, J. Owen, M. Pravec, P. Rivkin, A. S. Robin, C. Q. Sánchez, P. Tusberti, F. Wünnemann, K. Zinzi, A. Epifani, E. Mazzotta Manzoni, C. May, B. H. Earth and Planetary Astrophysics On September 26, 2022, NASA's Double Asteroid Redirection Test (DART) mission successfully impacted Dimorphos, the natural satellite of the binary near-Earth asteroid (65803) Didymos. Numerical simulations of the impact provide a means to explore target surface material properties and structures, consistent with the observed momentum deflection efficiency, ejecta cone geometry, and ejected mass. Our simulation, which best matches observations, indicates that Dimorphos is weak, with a cohesive strength of less than a few pascals (Pa), similar to asteroids (162173) Ryugu and (101955) Bennu. We find that a bulk density of Dimorphos, rhoB, lower than 2400 kg/m3, and a low volume fraction of boulders (<40 vol%) on the surface and in the shallow subsurface, are consistent with measured data from the DART experiment. These findings suggest Dimorphos is a rubble pile that might have formed through rotational mass shedding and re-accumulation from Didymos. Our simulations indicate that the DART impact caused global deformation and resurfacing of Dimorphos. ESA's upcoming Hera mission may find a re-shaped asteroid, rather than a well-defined crater.
title	Physical properties of asteroid Dimorphos as derived from the DART impact
topic	Earth and Planetary Astrophysics
url	https://arxiv.org/abs/2403.00667