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|Title:||Investigating the correlations between water coma emissions and active regions in comet 67P/ Churyumov-Gerasimenko||Authors:||MIGLIORINI, Alessandra
Combi, Michael R.
|Issue Date:||2016||Volume:||Division for Planetary Sciences Abstracts Book||First Page:||206.08||Abstract:||Vibrational emission lines of H<SUB>2</SUB>O and CO<SUB>2</SUB> at 2.67 and 4.27 μm, respectively, were identified by the VIRTIS spectrometer (Bockelée-Morvan et al., 2015; Migliorini et al., 2016; Fink et al., 2016) and mapped from the surface up to about 10 km altitude with a spatial resolution on the order of tens of meters per pixel (Migliorini et al., 2016).Data acquired in April 2015 with the VIRTIS spectrometer on board the Rosetta mission, provided information on the possible correlation between the H<SUB>2</SUB>O emission in the inner coma and the exposed water deposits detected in the Hapi region on the 67P/Churyumov-Gerasimenko surface (Migliorini et al., 2106; De Sanctis et al., 2015). Further bright spots attributed to exposed water ice have been identified in other regions by OSIRIS at visible wavelengths (Pommerol, et al., 2015) and confirmed in the infrared by VIRTIS-M in the Imothep region (Filacchione et al., 2016). The small dimensions of these icy spots - approximately 100x100 m (Filacchione et al., 2016) - and the relatively small amount of water ice (about 5%) make uncertain the correlation with the strong emissions in the coma.However, VIRTIS data show that the distribution of jet-like emissions seems to follow the distribution of cliffs and exposed areas identified in the North hemisphere with OSIRIS camera (Vincent et al., 2015). These areas are mainly concentrated in correspondence of comet's rough terrains, while a lack of active regions is observed in the comet's neck. Nevertheless, strong H<SUB>2</SUB>O emission is observed above the neck with VIRTIS. This might be a consequence of gas jets that are originated in the surrounding of the neck but converging towards the neck itself. This gaseous activity is the main driver of the dust upwelling (Migliorini et al, 2016; Rinaldi et al., in preparation)In this paper, we investigate the relationship between H<SUB>2</SUB>O vapour observed with VIRTIS within 5 km from the 67P/C-G nucleus and the exposed regions identified by OSIRIS on the surface (in the timeframe March to April 2015) with an attempt to address possible variations with the heliocentric distance.||Conference Name:||48th DPS Annual Meeting for Division for Planetary Sciences||Conference Place:||Pasadena, CA, USA||Conference Date:||16-21 October, 2016||URI:||http://hdl.handle.net/20.500.12386/26473||URL:||https://aas.org/meetings/dps48||Bibcode ADS:||2016DPS....4820608M||Fulltext:||open|
|Appears in Collections:||3.02 Abstract in Atti di convegno|
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