6099 General or miscellaneous; PLANETARY SCIENCES: COMETS AND SMALL BODIESDE: 6218 Jovian satellites; PLANETARY SCIENCES: SOLAR SYSTEM OBJECTSDE: 6299 General or miscellaneous; PLANETARY SCIENCES: SOLAR SYSTEM OBJECTSDE: 5499 General or miscellaneous; PLANETARY SCIENCES: SOLID SURFACE PLANETS
Abstract :
[en] Near-infrared observations of Io during occultation by Jupiter and the other Galilean satellites have been central to ground-based studies of Io's volcanism for decades. When such observations are made using adaptive optics on 8-10m telescopes, the infrared emission from individual features can be resolved at a resolution approaching a few km on Io's surface. On March 8, 2015, the Large Binocular Telescope Interferometer (LBTI) observed Io during a Europa mutual occultation event. Images were obtained at a wavelength of 4.8 microns every 123 milliseconds, corresponding to 2 km on Io's surface. The thermal emission from four hot spots including Loki Patera, Pillan Patera, and Kurdalagon Patera is clearly resolved. The latter two hot spots hosted bright eruptions in early 2015; the thermal emission from these sites likely represents the aftermath of those eruptions. The occultation light curves are used to construct a brightness temperature map for each of the four hot spots, from which the lava age is estimated using a model for cooling basaltic lavas. The thermal mapping of Loki Patera has produced the first-ever temperature map of the entire patera floor at high (10 km) spatial resolution, and the corresponding age distribution yields the resurfacing rate. For each hot spot, the age and spatial extent of the lava is interpreted in the context of its activity during the surrounding months.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
de Kleer, K.; University of California Berkeley, Berkeley, CA, United States
Skrutskie, M.; University of Virginia, Charlottesville, VA, United States
Leisenring, J.; University of Arizona, Tucson, AZ, United States
Davies, A. G.; Jet Propulsion Laboratory, Pasadena, CA, United States
Resnick, A.; Amherst College, Amherst, MA, United States
Conrad, A.; LBTO, University of Arizona, Tucson, AZ, United States
De Pater, I.; University of California Berkeley, Berkeley, CA, United States
Hinz, P.; University of Arizona, Tucson, AZ, United States
Defrere, Denis ; Université de Liège > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS)
Veillet, C.; LBTO, University of Arizona, Tucson, AZ, United States )
Language :
English
Title :
Resolving Io's Volcanoes from a Mutual Event Observation at the Large Binocular Telescope
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