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Catalogue POP – Notice individuelle de publication

Agarwal Jessica, Della Corte Vincenzo, Feldman Paul D., Geiger B., Merouane S., Bertini Ivano, Bodewits Dennis, Fornasier Sonia, Grün Eberhard, Hasselmann Pedro Henrique, Hilchenbach M., Höfner Sebastian, Ivanovski Stavro L., Kolokolova L., Pajola Maurizio, Rotundi Alessandra, Sierks Holger, Steffl A. J., Thomas Nicholas, A'Hearn M. F., Barbieri Cesare, Barucci Maria Antonella, Bertaux Jean-Loup, Boudreault S., Cremonese Gabriele, Da Deppo Vania, Davidsson Björn, Debei Stefano, De Cecco M., Deller J. F., Feaga L. M., Fischer H., Fulle Marco, Gicquel Adeline, Groussin Olivier, Güttler Carsten, Gutierrez Pedro J., Hofmann M., Hornung K., Hviid Stubbe F., Ip W., Jorda Laurent, Keller Horst Uwe, Kissel J., Knollenberg Jörg, Koch A., Koschny Detlef, Kramm Rainer, Kührt Ekkehard, Küppers Michael, Lamy Philippe, Langevin Yves, Lara Luisa M., Lazzarin Monica, Lin Zhong-Yi, López-Moreno José J., Lowry Stephen, Marzari Francesco, Mottola Stefano, Naletto Giampiero, Oklay Nilda, Parker Joel Wm., Rodrigo Rafael, Rynö J., Shi X., Stenzel O., Tubiana Cecilia, Vincent Jean-Baptiste, Weaver Harold A., Zaprudin B.

Evidence of sub-surface energy storage in comet 67P from the outburst of 2016 July 03

Monthly notices of the Royal Astronomical Society, 2017, vol. 469, pp. s606-s625

Référence DOI : 10.1093/mnras/stx2386
Référence ADS : 2017MNRAS.469S.606A

Résumé :

On 2016 July 03, several instruments onboard ESA's Rosetta spacecraft detected signs of an outburst event on comet 67P, at a heliocentric distance of 3.32 au from the Sun, outbound from perihelion. We here report on the inferred properties of the ejected dust and the surface change at the site of the outburst. The activity coincided with the local sunrise and continued over a time interval of 14-68 min. It left a 10-m-sized icy patch on the surface. The ejected material comprised refractory grains of several hundred microns in size, and sub-micron-sized water ice grains. The high dust mass production rate is incompatible with the free sublimation of crystalline water ice under solar illumination as the only acceleration process. Additional energy stored near the surface must have increased the gas density. We suggest a pressurized sub-surface gas reservoir, or the crystallization of amorphous water ice as possible causes.

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