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Evidence for the formation of comet 67p/churyumov-gerasimenko through gravitational collapse of a bound clump of pebbles

Blum, Jurgen (author)
Technical University of Braunschweig
Gundlach, Bastian (author)
Technical University of Braunschweig
Krause, Maya (author)
Technical University of Braunschweig
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Fulle, Marco (author)
INAF Astronomical Observatory of Trieste
Johansen, Anders (author)
Lund University,Lunds universitet,Astronomi - Genomgår omorganisation,Institutionen för astronomi och teoretisk fysik - Genomgår omorganisation,Naturvetenskapliga fakulteten,Lund Observatory - Undergoing reorganization,Department of Astronomy and Theoretical Physics - Undergoing reorganization,Faculty of Science
Agarwal, Jessica (author)
Max Planck Institute for Solar System Research
Von Borstel, Ingo (author)
Technical University of Braunschweig
Shi, Xian (author)
Max Planck Institute for Solar System Research
Hu, Xuanyu (author)
Max Planck Institute for Solar System Research,Technical University of Braunschweig
Bentley, Mark S. (author)
Space Research Institute, AAS
Capaccioni, Fabrizio (author)
INAF - Osservatorio Astronomico di Padova
Colangeli, Luigi (author)
European Space Research and Technology Centre (ESA/ESTEC)
Corte, Vincenzo Della (author)
INAF - Osservatorio Astronomico di Padova
Fougere, Nicolas (author)
University of Michigan
Green, Simon F. (author)
Open University
Ivanovski, Stavro (author)
INAF - Osservatorio Astronomico di Padova
Mannel, Thurid (author)
Space Research Institute, AAS,Karl-Franzens-University of Graz
Merouane, Sihane (author)
Max Planck Institute for Solar System Research
Migliorini, Alessandra (author)
INAF - Osservatorio Astronomico di Padova
Rotundi, Alessandra (author)
INAF - Osservatorio Astronomico di Padova,Parthenope University of Naples
Schmied, Roland (author)
Space Research Institute, AAS
Snodgrass, Colin (author)
Open University
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 (creator_code:org_t)
2017-10-25
2017
English.
In: Monthly Notices of the Royal Astronomical Society. - : Oxford University Press (OUP). - 0035-8711 .- 1365-2966. ; 469, s. 755-773
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  • Journal article (peer-reviewed)
Abstract Subject headings
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  • The processes that led to the formation of the planetary bodies in the Solar system are still not fully understood. Using the results obtained with the comprehensive suite of instruments onboard the European Space Agency's Rosetta mission, we present evidence that comet 67P/Churyumov-Gerasimenko likely formed through the gentle gravitational collapse of a bound clump of mm-sized dust aggregates ('pebbles'), intermixed with microscopic ice particles. This formation scenario leads to a cometary make-up that is simultaneously compatible with the global porosity, homogeneity, tensile strength, thermal inertia, vertical temperature profiles, sizes and porosities of emitted dust and the steep increase in water-vapour production rate with decreasing heliocentric distance, measured by the instruments onboard the Rosetta spacecraft and the Philae lander. Our findings suggest that the pebbles observed to be abundant in protoplanetary discs around young stars provide the building material for comets and other minor bodies.

Subject headings

NATURVETENSKAP  -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
NATURAL SCIENCES  -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)

Keyword

67p/churyumov-gerasimenko - planets and satellites
Comets
Formation - protoplanetary discs
Individual

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