Composition of Jupiter irregular satellites sheds light on their origin
| Title: | Composition of Jupiter irregular satellites sheds light on their origin |
|---|---|
| Authors: | Bhatt, M., Reddy, V., Schindler, K., Cloutis, E., Bhardwaj, A., Corre, L. L., Mann, P. |
| Source: | A&A 608, A67 (2017) |
| Publication Year: | 2017 |
| Collection: | Astrophysics |
| Subject Terms: | Astrophysics - Earth and Planetary Astrophysics |
| More Details: | Irregular satellites of Jupiter with their highly eccentric, inclined and distant orbits suggest that their capture took place just before the giant planet migration. 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. We observed three Jovian irregular satellites, Himalia, Elara, and Carme, using a medium-resolution 0.8-5.5 micro m spectrograph on the National Aeronautics and Space Administration (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. Our results confirm that the surface of Himalia, Elara, and Carme 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 microm and is spectrally distinct from those of Himalia and Elara. Our model suggests that it is compositionally similar to amorphous carbon. Himalia and Elara are compositionally similar but differ significantly from Carme. These results support the hypotheses that the Jupiter irregular satellites are captured bodies that were subject to further breakup events and clustered as families based on their similar physical and surface compositions. |
| Document Type: | Working Paper |
| DOI: | 10.1051/0004-6361/201630361 |
| Access URL: | http://arxiv.org/abs/1710.06200 |
| Accession Number: | edsarx.1710.06200 |
| Database: | arXiv |
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| Items | – Name: Title Label: Title Group: Ti Data: Composition of Jupiter irregular satellites sheds light on their origin – Name: Author Label: Authors Group: Au Data: <searchLink fieldCode="AR" term="%22Bhatt%2C+M%2E%22">Bhatt, M.</searchLink><br /><searchLink fieldCode="AR" term="%22Reddy%2C+V%2E%22">Reddy, V.</searchLink><br /><searchLink fieldCode="AR" term="%22Schindler%2C+K%2E%22">Schindler, K.</searchLink><br /><searchLink fieldCode="AR" term="%22Cloutis%2C+E%2E%22">Cloutis, E.</searchLink><br /><searchLink fieldCode="AR" term="%22Bhardwaj%2C+A%2E%22">Bhardwaj, A.</searchLink><br /><searchLink fieldCode="AR" term="%22Corre%2C+L%2E+L%2E%22">Corre, L. L.</searchLink><br /><searchLink fieldCode="AR" term="%22Mann%2C+P%2E%22">Mann, P.</searchLink> – Name: TitleSource Label: Source Group: Src Data: A&A 608, A67 (2017) – Name: DatePubCY Label: Publication Year Group: Date Data: 2017 – Name: Subset Label: Collection Group: HoldingsInfo Data: Astrophysics – Name: Subject Label: Subject Terms Group: Su Data: <searchLink fieldCode="DE" term="%22Astrophysics+-+Earth+and+Planetary+Astrophysics%22">Astrophysics - Earth and Planetary Astrophysics</searchLink> – Name: Abstract Label: Description Group: Ab Data: Irregular satellites of Jupiter with their highly eccentric, inclined and distant orbits suggest that their capture took place just before the giant planet migration. 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. We observed three Jovian irregular satellites, Himalia, Elara, and Carme, using a medium-resolution 0.8-5.5 micro m spectrograph on the National Aeronautics and Space Administration (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. Our results confirm that the surface of Himalia, Elara, and Carme 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 microm and is spectrally distinct from those of Himalia and Elara. Our model suggests that it is compositionally similar to amorphous carbon. Himalia and Elara are compositionally similar but differ significantly from Carme. These results support the hypotheses that the Jupiter irregular satellites are captured bodies that were subject to further breakup events and clustered as families based on their similar physical and surface compositions. – Name: TypeDocument Label: Document Type Group: TypDoc Data: Working Paper – Name: DOI Label: DOI Group: ID Data: 10.1051/0004-6361/201630361 – Name: URL Label: Access URL Group: URL Data: <link linkTarget="URL" linkTerm="http://arxiv.org/abs/1710.06200" linkWindow="_blank">http://arxiv.org/abs/1710.06200</link> – Name: AN Label: Accession Number Group: ID Data: edsarx.1710.06200 |
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| RecordInfo | BibRecord: BibEntity: Identifiers: – Type: doi Value: 10.1051/0004-6361/201630361 Subjects: – SubjectFull: Astrophysics - Earth and Planetary Astrophysics Type: general Titles: – TitleFull: Composition of Jupiter irregular satellites sheds light on their origin Type: main BibRelationships: HasContributorRelationships: – PersonEntity: Name: NameFull: Bhatt, M. – PersonEntity: Name: NameFull: Reddy, V. – PersonEntity: Name: NameFull: Schindler, K. – PersonEntity: Name: NameFull: Cloutis, E. – PersonEntity: Name: NameFull: Bhardwaj, A. – PersonEntity: Name: NameFull: Corre, L. L. – PersonEntity: Name: NameFull: Mann, P. IsPartOfRelationships: – BibEntity: Dates: – D: 17 M: 10 Type: published Y: 2017 |
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