Header
Accueil du site > Publications > Xenon isotopes in 67P/Churyumov- Gerasimenko show that comets contributed (...)

Xenon isotopes in 67P/Churyumov- Gerasimenko show that comets contributed to Earth’s atmosphere

Marty, B. et al., Science

Marty, B. ; Altweg, K. ; Balsigern H. ; Bar-Nun, A. ; Bekaert, D.V. ; Berthelier, J.J. ; Bieler, A. ; Briois, C. ; Calmonte, U. ; Combi, M. ; De Keyser, J. ; Fiethe, B. ; Fuselier, S.A. ; Gasc, S. ; Gombosi, T.I. ; Hansen, K.C. ; Hässig, M. ; Jäckel, A. ; Kopp, E. ; Korth, A. ; Le Roy, L. ; Mall, U. ; Mousis, O. ; Owen, T. ; Rème, H. ; Rubin, M. ; Sémon, T. ; Tzou, C.Y. ; Waite, J.H. ; Wurz, P.

Science, 2017, 356, 1069-1072

Abstract :

The origin of cometary matter and the potential contribution of comets to inner-planet atmospheres are long-standing problems. During a series of dedicated low-altitude orbits, the Rosetta Orbiter Spectrometer for Ion and Neutral Analysis (ROSINA) on the Rosetta spacecraft analyzed the isotopes of xenon in the coma of comet 67P/Churyumov-Gerasimenko. The xenon isotopic composition shows deficits in heavy xenon isotopes and matches that of a primordial atmospheric component. The present-day Earth atmosphere contains 22 ± 5% cometary xenon, in addition to chondritic (or solar) xenon.

Voir en ligne : http://dx.doi.org/10.1126/science.a...



Portfolio


publié mardi 11 juillet 2017