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- Pommerol, A.Univ Bern, Inst Phys, CH-3012 Bern, Switzerland. (author)
OSIRIS observations of meter-sized exposures of H2O ice at the surface of 67P/Churyumov-Gerasimenko and interpretation using laboratory experiments
- Article/chapterEnglish2015
Publisher, publication year, extent ...
- 2015-10-30
- EDP Sciences,2015
- printrdacarrier
Numbers
- LIBRIS-ID:oai:DiVA.org:uu-270616
- https://urn.kb.se/resolve?urn=urn:nbn:se:uu:diva-270616URI
- https://doi.org/10.1051/0004-6361/201525977DOI
Supplementary language notes
- Language:English
- Summary in:English
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Notes
- Since OSIRIS started acquiring high-resolution observations of the surface of the nucleus of comet 67P/Churyumov-Gerasimenko, over one hundred meter-sized bright spots have been identified in numerous types of geomorphologic regions, but mostly located in areas receiving low insolation. The bright spots are either clustered, in debris fields close to decameter-high cliffs, or isolated without structural relation to the surrounding terrain. They can be up to ten times brighter than the average surface of the comet at visible wavelengths and display a significantly bluer spectrum. They do not exhibit significant changes over a period of a few weeks. All these observations are consistent with exposure of water ice at the surface of boulders produced by dislocation of the weakly consolidated layers that cover large areas of the nucleus. Laboratory experiments show that under simulated comet surface conditions, analog samples acquire a vertical stratification with an uppermost porous mantle of refractory dust overlaying a layer of hard ice formed by recondensation or sintering under the insulating dust mantle. The evolution of the visible spectrophotometric properties of samples during sublimation is consistent with the contrasts of brightness and color seen at the surface of the nucleus. Clustered bright spots are formed by the collapse of overhangs that is triggered by mass wasting of deeper layers. Isolated spots might be the result of the emission of boulders at low velocity that are redepositioned in other regions.
Subject headings and genre
- NATURVETENSKAP Fysik Astronomi, astrofysik och kosmologi hsv//swe
- NATURAL SCIENCES Physical Sciences Astronomy, Astrophysics and Cosmology hsv//eng
- comets: general
- techniques: image processing
- methods: laboratory: solid state
Added entries (persons, corporate bodies, meetings, titles ...)
- Thomas, N.Univ Bern, Inst Phys, CH-3012 Bern, Switzerland. (author)
- El-Maarry, M. R.Univ Bern, Inst Phys, CH-3012 Bern, Switzerland. (author)
- Pajola, M.Univ Padua, Ctr Ateneo Studi & Attivita Spaziali, Giuseppe Colombo CISAS, I-35131 Padua, Italy. (author)
- Groussin, O.Aix Marseille Univ, CNRS, UMR 7326, LAM, F-13388 Marseille, France. (author)
- Auger, A. -T (author)
- Oklay, N.Max Planck Inst Sonnensyst Forsch, D-37077 Gottingen, Germany. (author)
- Fornasier, S.Univ Paris Diderot, Univ Paris 06, CNRS, LESIA,Observ Paris, F-92195 Meudon, France. (author)
- Feller, C.Univ Paris Diderot, Univ Paris 06, CNRS, LESIA,Observ Paris, F-92195 Meudon, France. (author)
- Davidsson, BjörnUppsala universitet,Institutionen för fysik och astronomi(Swepub:uu)bjoda312 (author)
- Gracia-Berna, A.Univ Bern, Inst Phys, CH-3012 Bern, Switzerland. (author)
- Jost, B.Univ Bern, Inst Phys, CH-3012 Bern, Switzerland. (author)
- Marschall, R.Univ Bern, Inst Phys, CH-3012 Bern, Switzerland. (author)
- Poch, O.Univ Bern, Inst Phys, CH-3012 Bern, Switzerland. (author)
- Barucci, M. A.Univ Paris Diderot, Univ Paris 06, CNRS, LESIA,Observ Paris, F-92195 Meudon, France. (author)
- Bertaux, J. -L (author)
- La Forgia, F.Univ Padua, Dept Phys & Astron, I-35122 Padua, Italy. (author)
- Keller, H. U.Deutsch Zentrum Luft & Raumfahrt DLR, Inst Planetenforsch, D-12489 Berlin, Germany.;Tech Univ Carolo Wilhelmina Braunschweig, IGEP, D-38106 Braunschweig, Germany. (author)
- Kuehrt, E.Deutsch Zentrum Luft & Raumfahrt DLR, Inst Planetenforsch, D-12489 Berlin, Germany. (author)
- Lowry, S. C.Univ Kent, Sch Phys Sci, Canterbury CT2 7NZ, Kent, England. (author)
- Mottola, S.Deutsch Zentrum Luft & Raumfahrt DLR, Inst Planetenforsch, D-12489 Berlin, Germany. (author)
- Naletto, G.Univ Padua, Ctr Ateneo Studi & Attivita Spaziali, Giuseppe Colombo CISAS, I-35131 Padua, Italy.;Univ Padua, Dept Informat Engn, I-35131 Padua, Italy.;CNR IFN UOS Padova LUXOR, I-35131 Padua, Italy. (author)
- Sierks, H.Max Planck Inst Sonnensyst Forsch, D-37077 Gottingen, Germany. (author)
- Barbieri, C.Univ Padua, Dept Phys & Astron, I-35122 Padua, Italy. (author)
- Lamy, P. L.Aix Marseille Univ, CNRS, UMR 7326, LAM, F-13388 Marseille, France. (author)
- Rodrigo, R.Int Space Sci Inst, CH-3012 Bern, Switzerland.;CSIC INTA, Ctr Astrobiol, Madrid 28850, Spain. (author)
- Koschny, D.European Space Agcy, Sci Support Off, NL-2201 Noordwijk, Netherlands. (author)
- Rickman, HansUppsala universitet,Institutionen för fysik och astronomi,PAS Space Res Ctr, PL-00716 Warsaw, Poland.(Swepub:uu)hansrick (author)
- Agarwal, J.Max Planck Inst Sonnensyst Forsch, D-37077 Gottingen, Germany. (author)
- A'Hearn, M. F.Univ Maryland, Dept Astron, College Pk, MD 20742 USA. (author)
- Bertini, I.Univ Padua, Ctr Ateneo Studi & Attivita Spaziali, Giuseppe Colombo CISAS, I-35131 Padua, Italy. (author)
- Boudreault, S.Max Planck Inst Sonnensyst Forsch, D-37077 Gottingen, Germany. (author)
- Cremonese, G.INAF Osservatorio Astron, I-35122 Padua, Italy. (author)
- Da Deppo, V.CNR IFN UOS Padova LUXOR, I-35131 Padua, Italy. (author)
- De Cecco, M.Univ Trent, I-38100 Trento, Italy. (author)
- Debei, S.Univ Padua, Dept Ind Engn, I-35131 Padua, Italy. (author)
- Guettler, C.Max Planck Inst Sonnensyst Forsch, D-37077 Gottingen, Germany. (author)
- Fulle, M.INAF Osservatorio Astron, I-34014 Trieste, Italy. (author)
- Gutierrez, P. J.INAF Osservatorio Astron, I-34014 Trieste, Italy. (author)
- Hviid, S. F.Deutsch Zentrum Luft & Raumfahrt DLR, Inst Planetenforsch, D-12489 Berlin, Germany. (author)
- Ip, W. -H (author)
- Jorda, L.Aix Marseille Univ, CNRS, UMR 7326, LAM, F-13388 Marseille, France. (author)
- Knollenberg, J.Deutsch Zentrum Luft & Raumfahrt DLR, Inst Planetenforsch, D-12489 Berlin, Germany. (author)
- Kovacs, G.Max Planck Inst Sonnensyst Forsch, D-37077 Gottingen, Germany. (author)
- Kramm, J. -R (author)
- Kueppers, E.European Space Astron Ctr ESA, Operat Dept, Madrid 28691, Spain. (author)
- Lara, L.CSIC, Inst Astrofis Andalucia, E-18008 Granada, Spain. (author)
- Lazzarin, M.Univ Padua, Dept Phys & Astron, I-35122 Padua, Italy. (author)
- Lopez Moreno, J. L.CSIC, Inst Astrofis Andalucia, E-18008 Granada, Spain. (author)
- Marzari, F.Univ Padua, Dept Phys & Astron, I-35122 Padua, Italy. (author)
- Michalik, H.Tech Univ Carolo Wilhelmina Braunschweig, Inst Datentech & Kommunikat Netze, D-38106 Braunschweig, Germany. (author)
- Preusker, F.Deutsch Zentrum Luft & Raumfahrt DLR, Inst Planetenforsch, D-12489 Berlin, Germany. (author)
- Scholten, F.Deutsch Zentrum Luft & Raumfahrt DLR, Inst Planetenforsch, D-12489 Berlin, Germany. (author)
- Tubiana, C.Max Planck Inst Sonnensyst Forsch, D-37077 Gottingen, Germany. (author)
- Vincent, J. -B (author)
- Univ Bern, Inst Phys, CH-3012 Bern, Switzerland.Univ Padua, Ctr Ateneo Studi & Attivita Spaziali, Giuseppe Colombo CISAS, I-35131 Padua, Italy. (creator_code:org_t)
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- Pommerol, A.
- Thomas, N.
- El-Maarry, M. R.
- Pajola, M.
- Groussin, O.
- Auger, A. -T
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- Oklay, N.
- Fornasier, S.
- Feller, C.
- Davidsson, Björn
- Gracia-Berna, A.
- Jost, B.
- Marschall, R.
- Poch, O.
- Barucci, M. A.
- Bertaux, J. -L
- La Forgia, F.
- Keller, H. U.
- Kuehrt, E.
- Lowry, S. C.
- Mottola, S.
- Naletto, G.
- Sierks, H.
- Barbieri, C.
- Lamy, P. L.
- Rodrigo, R.
- Koschny, D.
- Rickman, Hans
- Agarwal, J.
- A'Hearn, M. F.
- Bertini, I.
- Boudreault, S.
- Cremonese, G.
- Da Deppo, V.
- De Cecco, M.
- Debei, S.
- Guettler, C.
- Fulle, M.
- Gutierrez, P. J.
- Hviid, S. F.
- Ip, W. -H
- Jorda, L.
- Knollenberg, J.
- Kovacs, G.
- Kramm, J. -R
- Kueppers, E.
- Lara, L.
- Lazzarin, M.
- Lopez Moreno, J. ...
- Marzari, F.
- Michalik, H.
- Preusker, F.
- Scholten, F.
- Tubiana, C.
- Vincent, J. -B
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