Rotationally-resolved spectroscopy of Jupiter Trojans (624) Hektor and (911) Agamemnon

We present the first-ever rotationally resolved spectroscopic investigation of (624) Hektor and (911) Agamemnon, the two largest Jupiter Trojans. The visible and near-infrared spectra that we have obtained at the TNG telescope (La Palma, Spain) do not show any feature or hints of heterogeneity. In p...

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Bibliographic Details
Published inarXiv.org
Main Authors Perna, Davide, Bott, Nicolas, Hromakina, Tetiana, Elena Mazzotta Epifani, Dotto, Elisabetta, Doressoundiram, Alain
Format Paper Journal Article
LanguageEnglish
Published Ithaca Cornell University Library, arXiv.org 22.12.2017
Subjects
Comets
Infrared imaging systems
Infrared spectra
Kerogen
Magnesium
Moisture content
Near infrared radiation
Photometry
Physics - Earth and Planetary Astrophysics
Spectrum analysis
Trojan orbits
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Summary:We present the first-ever rotationally resolved spectroscopic investigation of (624) Hektor and (911) Agamemnon, the two largest Jupiter Trojans. The visible and near-infrared spectra that we have obtained at the TNG telescope (La Palma, Spain) do not show any feature or hints of heterogeneity. In particular we found no hints of water-related absorptions. No cometary activity was detected down to ~23.5 R-mag/arcsec2 based on the complementary photometric data. We estimated upper limits on the dust production rates of Hektor and Agamemnon to be ~30 kg/s and ~24 kg/s, respectively. We modelled complete visible and near-infrared spectra of our targets using the Shkuratov formalism, to define the upper limit to the presence of water ice and more in general to constrain their surface composition. For both objects, successful models include amorphous carbon, magnesium-rich pyroxene and kerogen, with an upper limit to the amount of water ice of a few percent.
ISSN:2331-8422
DOI:10.48550/arxiv.1712.08502