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

Jessica Agarwal 1 Vincenzo Della Corte 2 Paul D. Feldman 3 Bernhard Geiger 4 S. Merouane 1 Ivano Bertini 5 Dennis Bodewits 6 Sonia Fornasier 7 Eberhard Grün 8, 9 Pedro Henrique Hasselmann 7 Martin Hilchenbach 1 Sebastien Höfner 1 Stavro Ivanovski 10 Ludmilla Kolokolova 6 Maurizio Pajola 11 Alessandra Rotundi 12 Holger Sierks 1 Andrew J. Steffl 13 Nicolas Thomas 14 Michael A'Hearn 6 Cesare Barbieri 15 Maria Antonella Barucci 7 Jean-Loup Bertaux 16 Steve Boudreault 1 Gabriele Cremonese 17 Vania da Deppo 18 Björn Davidsson 19 Stefano Debei 20 Mariolino de Cecco 11 Jakob Deller 1 Lori M. Feaga 6 H. Fisher 1 Marco Fulle 21 Adeline Gicquel 19 O. Groussin 22 Carsten Güttler 1 Pedro J. Gutierrez 23 Marc Hofmann 1 K. Hornung 24 Stubbe F. Hviid 25 Wing-Huen Ip 26 Laurent Jorda 22 Horst Uwe Keller 27 J. Kissel 1 Jörg Knollenberg 25 A. Koch 28 Detlief Koschny 29 Jörg Rainer Kramm 1 Ekkehard Kührt 30 M. Küppers 4 Philippe Lamy 22 Yves Langevin 31 Luisa M. Lara 23 Monica Lazzarin 15 Zhong-Yi Lin 26 J. J. Lopez Moreno 23 Stephen C. Lowry 32 Francesco Marzari 15 S. Mottola 25 Giampiero Naletto 5, 33 Nilda Oklay 1 J. Wm. Parker 13 R. Rodrigo 34, 35 J. Rynö 36 Xian Shi 1 O. Stenzel 1 Cécilia Tubiana 1 Jean-Baptiste Vincent 25 H. A. Weaver 37 B. Zaprudin 38 
LATMOS - Laboratoire Atmosphères, Milieux, Observations Spatiales
Abstract : 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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Jessica Agarwal, Vincenzo Della Corte, Paul D. Feldman, Bernhard Geiger, S. Merouane, et al.. Evidence of sub-surface energy storage in comet 67P from the outburst of 2016 July 03. Monthly Notices of the Royal Astronomical Society, Oxford University Press (OUP): Policy P - Oxford Open Option A, 2017, 469 (Suppl_2), pp.s606-s625. ⟨10.1093/mnras/stx2386⟩. ⟨obspm-02196759⟩



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