Rotationally-resolved spectroscopy of Jupiter Trojans (624) Hektor and (911) Agamemnon
arXiv:1712.08502 · doi:10.1093/mnras/stx3341
Abstract
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.
arXiv commentAccepted for publication in MNRAS
References in corpus (15)
- The Active Centaurs
- The Absolute Magnitude Distribution of Kuiper Belt Objects
- Capture of Trojans by Jumping Jupiter
- Spectrophotometric properties of the nucleus of comet 67P/Churyumov-Gerasimenko from the OSIRIS instrument onboard the ROSETTA spacecraft
- Near-Infrared Spectroscopy of Trojan Asteroids: Evidence for Two Compositional Groups
- Densities of Solar System Objects from their Rotational Lightcurves
- WISE/NEOWISE Observations of the Jovian Trojan Population: Taxonomy
- Visible spectroscopic and photometric survey of Jupiter Trojans: final results on dynamical families
- A hypothesis for the color bimodality of Jupiter Trojans
- The Puzzling Mutual Orbit of the Binary Trojan Asteroid (624) Hektor
- The 3-4 m Spectra of Jupiter Trojan Asteroids
- Mid-infrared spectra of comet nuclei
- Survival of water ice in Jupiter Trojans
- Hektor - an exceptional D-type family among Jovian Trojans
- Short-term variability on the surface of (1) Ceres. A changing amount of water ice?