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Composition of Jupiter irregular satellites sheds light on their origin

dc.contributor.author Bhatt, M.
dc.contributor.author Reddy, V.
dc.contributor.author Schindler, K.
dc.contributor.author Cloutis, E.
dc.contributor.author Bhardwaj, A.
dc.contributor.author Corre, L. L.
dc.contributor.author 曼,P。
dc.date.accessioned 2018-03-14T16:17:48Z
dc.date.available 2018-03-14T16:17:48Z
dc.date.issued 2017
dc.identifier.citation Bhatt, M., V. Reddy, K. Schindler, E. Cloutis, A. Bhardwaj, L. Le Corre, and P. Mann (2017) Composition of Jupiter irregular satellites sheds light on their origin. Astronomy & Astrophysics, 608, A67. DOI: 10.1051/0004-6361/201630361. en_US
dc.identifier.issn 0004-6361
dc.identifier.uri http://hdl.handle.net/10680/1405
dc.description.abstract Context. Irregular satellites of Jupiter with their highly eccentric, inclined and distant orbits suggest that their capture took place after the giant planet migration. Aims. We aim to improve our understanding of the surface composition of irregular satellites of Jupiter to gain insight into a narrow time window when our solar system was forming. Methods. We observed three Jovian irregular satellites, Himalia (JVI), Elara (JVII), and Carme (JXI), using a medium-resolution 0.8–5.5 µm spectrograph, SpeX on the NASA Infrared Telescope Facility (IRTF). Using a linear spectral unmixing model we have constrained the major mineral phases on the surface of these three bodies. Results. Our results confirm that the surface of Himalia (JVI), Elara (JVII), and Carme (JXI) are dominated by opaque materials such as those seen in carbonaceous chondrite meteorites. Our spectral modeling of NIR spectra of Himalia and Elara confirm that their surface composition is the same and magnetite is the dominant mineral. A comparison of the spectral shape of Himalia with the two large main C-type asteroids, Themis (D ~ 176 km) and Europa (D ~ 352 km), suggests surface composition similar to Europa. The NIR spectrum of Carme exhibits blue slope up to 1.5 µm and is spectrally distinct from those of Himalia and Elara. Our model suggests that it is compositionally similar to amorphous carbon. Conclusions. Himalia and Elara are compositionally similar but differ significantly from Carme. These results support the hypotheses that the Jupiter’s irregular satellites are captured bodies that were subject to further breakup events and clustered as families based on their similar physical and surface compositions. en_US
dc.description.sponsorship M.B. is funded by the Indian Space Research Organization through its post doctoral program.... Work by V.R. was funded by NASA Planetary Geology and Geophysics grants NNX14AN05G and NNX14AN35G. E.A.C. thanks the Canada Foundation for Innovation, the Manitoba Research Innovations Fund, the Canadian Space Agency, the Natural Sciences and Engineering Research Council of Canada, and the University of Winnipeg for supporting the establishment and operation of the Planetary Spectrophotometer Facility. en_US
dc.description.uri https://www.aanda.org/articles/aa/abs/2017/12/aa30361-16/aa30361-16.html
dc.language.iso en en_US
dc.publisher EDP Sciences en_US
dc.rights info:eu-repo/semantics/openAccess
dc.subject Planets and satellites: individual: Himalia en_US
dc.subject Planets and satellites: surfaces en_US
dc.subject Techniques: spectroscopic en_US
dc.subject Planets and satellites: individual: Elara en_US
dc.subject Planets and satellites: individual: Carme en_US
dc.title Composition of Jupiter irregular satellites sheds light on their origin en_US
dc.type Article en_US
dc.identifier.doi 10.1051/0004-6361/201630361


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