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Seasonal erosion an...
Seasonal erosion and restoration of the dust cover on comet 67P/Churyumov-Gerasimenko as observed by OSIRIS onboard Rosetta
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- Hu, X. (author)
- Max Planck Inst Sonnensyst Forsch MPS, Justus von Liebig Weg 3, D-37077 Gottingen, Germany.;Tech Univ Carolo Wilhelmina Braunschweig, IGEP, Mendelssohnstr 3, D-38106 Braunschweig, Germany.
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- Shi, X. (author)
- Max Planck Inst Sonnensyst Forsch MPS, Justus von Liebig Weg 3, D-37077 Gottingen, Germany.
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- Sierks, H. (author)
- Max Planck Inst Sonnensyst Forsch MPS, Justus von Liebig Weg 3, D-37077 Gottingen, Germany.
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show more...
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- Fulle, M. (author)
- INAF Osservatorio Astron Trieste, Via Tiepolo 11, I-34014 Trieste, Italy.
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- Blum, J. (author)
- Tech Univ Carolo Wilhelmina Braunschweig, IGEP, Mendelssohnstr 3, D-38106 Braunschweig, Germany.
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- Keller, H. U. (author)
- Tech Univ Carolo Wilhelmina Braunschweig, IGEP, Mendelssohnstr 3, D-38106 Braunschweig, Germany.
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- Kührt, E. (author)
- Inst Plasmaforsch, Deutsch Zentrum Luft & Raumfahrt DLR, Rutherfordstr 2, D-12489 Berlin, Germany.
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- Davidsson, B. (author)
- Jet Prop Lab, M-S 183-301,4800 Oak Grove Dr, Pasadena, CA 91109 USA.
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- Güttler, C. (author)
- Max Planck Inst Sonnensyst Forsch MPS, Justus von Liebig Weg 3, D-37077 Gottingen, Germany.
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- Gundlach, B. (author)
- Tech Univ Carolo Wilhelmina Braunschweig, IGEP, Mendelssohnstr 3, D-38106 Braunschweig, Germany.
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- Pajola, M. (author)
- Ames Res Ctr, Moffett Field, CA 94035 USA.
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- Bodewits, D. (author)
- Univ Maryland, Dept Astron, College Pk, MD 20742 USA.
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Vincent, J. -B (author)
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- Oklay, N. (author)
- Max Planck Inst Sonnensyst Forsch MPS, Justus von Liebig Weg 3, D-37077 Gottingen, Germany.
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- Massironi, M. (author)
- INAF Osservatorio Astron Padova, Vicolo Osservatorio 5, I-35122 Padua, Italy.
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- Fornasier, S. (author)
- Univ Paris Diderot, Univ Pierre & Marie Curie, CNRS, Observ Paris,LESIA, 5 Pl J Janssen, F-92195 Meudon, France.
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- Tubiana, C. (author)
- Max Planck Inst Sonnensyst Forsch MPS, Justus von Liebig Weg 3, D-37077 Gottingen, Germany.
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- Groussin, O. (author)
- Aix Marseille Univ, LAM, CNRS, UMR 7326, F-13388 Marseille, France.
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- Boudreault, S. (author)
- Max Planck Inst Sonnensyst Forsch MPS, Justus von Liebig Weg 3, D-37077 Gottingen, Germany.
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- Höfner, S. (author)
- Max Planck Inst Sonnensyst Forsch MPS, Justus von Liebig Weg 3, D-37077 Gottingen, Germany.
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- Mottola, S. (author)
- Inst Plasmaforsch, Deutsch Zentrum Luft & Raumfahrt DLR, Rutherfordstr 2, D-12489 Berlin, Germany.
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- Barbieri, C. (author)
- Univ Padua, Dept Phys & Astron G Galilei, Vicolo Osservatorio 3, I-35122 Padua, Italy.
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- Lamy, P. L. (author)
- CNRS, UMR 7326, Lab Astrophys Marseille, 38 Rue Frederic Joliot Curie, F-13388 Marseille 13, France.;Aix Marseille Univ, 38 Rue Frederic Joliot Curie, F-13388 Marseille 13, France.
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- Rodrigo, R. (author)
- INTA, CSIC, Ctr Astrobiol, 28850 Torrejon Ardoz, Madrid, Spain.;Int Space Sci Inst, Hallerstr 6, CH-3012 Bern, Switzerland.
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- Koschny, D. (author)
- ESA, European Space Res & Technol Ctr, Sci Support Off, Keplerlaan 1,Postbus 299, NL-2201 Noordwijk, Netherlands.
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- Rickman, Hans (author)
- Uppsala universitet,Observationell astrofysik,PAS Space Reserch Ctr, Bartycka 18A, PL-00716 Warsaw, Poland
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A'Hearn, M. (author)
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- Agarwal, J. (author)
- Max Planck Inst Sonnensyst Forsch MPS, Justus von Liebig Weg 3, D-37077 Gottingen, Germany.
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- Barucci, M. A. (author)
- Univ Paris Diderot, Univ Pierre & Marie Curie, CNRS, Observ Paris,LESIA, 5 Pl J Janssen, F-92195 Meudon, France.
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Bertaux, J. -L (author)
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- Bertini, I. (author)
- Univ Padua, Ctr Ateneo & Attivita Spaziali Giuseppe Colombo C, Via Venezia 15, I-35131 Padua, Italy.
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- Cremonese, G. (author)
- INAF Osservatorio Astron Padova, Vicolo Osservatorio 5, I-35122 Padua, Italy.
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- Da Deppo, V. (author)
- IFN UOS Padova LUXOR, CNR, Via Trasea 7, I-35131 Padua, Italy.
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- Debei, S. (author)
- Univ Padua, Dept Ind Engn, Via Venezia 1, I-35131 Padua, Italy.
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- De Cecco, M. (author)
- Univ Trento, Via Sommar 9, I-38123 Trento, Italy.
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- Deller, J. (author)
- Max Planck Inst Sonnensyst Forsch MPS, Justus von Liebig Weg 3, D-37077 Gottingen, Germany.
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- El-Maarry, M. R. (author)
- Univ Bern, Phys Inst, Sidlerstr 5, CH-3012 Bern, Switzerland.;Univ Colorado, Lab Atmospher & Space Phys, Boulder, CO 80301 USA.
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- Gicquel, A. (author)
- Max Planck Inst Sonnensyst Forsch MPS, Justus von Liebig Weg 3, D-37077 Gottingen, Germany.
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- Gutierrez-Marques, P. (author)
- Max Planck Inst Sonnensyst Forsch MPS, Justus von Liebig Weg 3, D-37077 Gottingen, Germany.
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- Gutierrez, P. J. (author)
- CSIC, Inst Astrofis Andalucia, Granada 18008, Spain.
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- Hofmann, M. (author)
- Max Planck Inst Sonnensyst Forsch MPS, Justus von Liebig Weg 3, D-37077 Gottingen, Germany.
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- Hviid, S. F. (author)
- Inst Plasmaforsch, Deutsch Zentrum Luft & Raumfahrt DLR, Rutherfordstr 2, D-12489 Berlin, Germany.
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Ip, W. -H (author)
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- Jorda, L. (author)
- Aix Marseille Univ, LAM, CNRS, UMR 7326, F-13388 Marseille, France.
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- Knollenberg, J. (author)
- Inst Plasmaforsch, Deutsch Zentrum Luft & Raumfahrt DLR, Rutherfordstr 2, D-12489 Berlin, Germany.
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- Kovacs, G. (author)
- Max Planck Inst Sonnensyst Forsch MPS, Justus von Liebig Weg 3, D-37077 Gottingen, Germany.
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Kramm, J. -R (author)
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- Küppers, M. (author)
- ESA, European Space Astron Ctr, Operat Dept, POB 78, Madrid 28691, Spain.
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- Lara, L. M. (author)
- CSIC, Inst Astrofis Andalucia, Granada 18008, Spain.
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- Lazzarin, M. (author)
- Univ Padua, Dept Phys & Astron G Galilei, Vicolo Osservatorio 3, I-35122 Padua, Italy.
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- Lopez-Moreno, J. J. (author)
- CSIC, Inst Astrofis Andalucia, Granada 18008, Spain.
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- Marzari, F. (author)
- Univ Padua, Dept Phys & Astron G Galilei, Vicolo Osservatorio 3, I-35122 Padua, Italy.
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- Naletto, G. (author)
- IFN UOS Padova LUXOR, CNR, Via Trasea 7, I-35131 Padua, Italy.;Univ Padua, Dept Informat Engn, Via Gradenigo 6-B, I-35131 Padua, Italy.
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- Thomas, N. (author)
- Univ Bern, Phys Inst, Sidlerstr 5, CH-3012 Bern, Switzerland.;Univ Bern, Ctr Space & Habitabil, CH-3012 Bern, Switzerland.
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Max Planck Inst Sonnensyst Forsch MPS, Justus von Liebig Weg 3, D-37077 Gottingen, Germany;Tech Univ Carolo Wilhelmina Braunschweig, IGEP, Mendelssohnstr 3, D-38106 Braunschweig, Germany. Max Planck Inst Sonnensyst Forsch MPS, Justus von Liebig Weg 3, D-37077 Gottingen, Germany. (creator_code:org_t)
- 2017-08-25
- 2017
- English.
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In: Astronomy and Astrophysics. - : EDP SCIENCES S A. - 0004-6361 .- 1432-0746. ; 604
- Related links:
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https://doi.org/10.1...
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Abstract
Subject headings
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- Context: Dust deposits or dust cover are a prevalent morphology in the northern hemi-nucleus of comet 67P /Churyumov-Gerasimenko (67P). The evolution of the dust deposits was captured by the OSIRIS camera system onboard the Rosetta spacecraft having escorted the comet for over two years. The observations shed light on the fundamental role of cometary activity in shaping and transforming the surface morphology.Aims: We aim to present OSIRIS observations of surface changes over the dust deposits before and after perihelion. The distribution of changes and a timeline of their occurrence are provided. We perform a data analysis to quantify the surface changes and investigate their correlation to water activity from the dust deposits. We further discuss how the results of our investigation are related to other findings from the Rosetta mission.Methods: Surface changes were detected via systematic comparison of images, and quantified using shape-from-shading technique. Thermal models were applied to estimate the erosion of water ice in response to the increasing insolation over the areas where surface changes occurred. Modeling results were used for the interpretation of the observed surface changes.Results: Surface changes discussed here were concentrated at mid-latitudes, between about 20 degrees N and 40 degrees N, marking a global transition from the dust-covered to rugged terrains. The changes were distributed in open areas exposed to ample solar illumination and likely subject to enhanced surface erosion before perihelion. The occurrence of changes followed the southward migration of the sub-solar point across the latitudes of their distribution. The erosion at locations of most changes was at least about 0 : 5 m, but most likely did not exceed several meters. The erosive features before perihelion had given way to a fresh, smooth cover of dust deposits after perihelion, suggesting that the dust deposits had been globally restored by at least about 1 m with ejecta from the intensely illuminated southern hemi-nucleus around perihelion, when the north was inactive during polar night.Conclusions: The erosion and restoration of the northern dust deposits are morphological expressions of seasonality on 67P. Based on observations and thermal modeling results, it is inferred that the dust deposits contained a few percent of water ice in mass on average. Local inhomogeneity in water abundance at spatial scales below tens of meters is likely. We suspect that dust ejected from the deposits may not have escaped the comet in bulk. That is, at least half of the ejected mass was afloat in the inner-coma or /and redeposited over other areas of the nucleus.
Subject headings
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
Keyword
- comets: general
- comets: individual: 67P/ Churyumov
- Gerasimenko
Publication and Content Type
- ref (subject category)
- art (subject category)
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To the university's database
- By the author/editor
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Hu, X.
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Shi, X.
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Sierks, H.
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Fulle, M.
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Blum, J.
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Keller, H. U.
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show more...
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Kührt, E.
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Davidsson, B.
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Güttler, C.
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Gundlach, B.
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Pajola, M.
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Bodewits, D.
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Vincent, J. -B
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Oklay, N.
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Massironi, M.
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Fornasier, S.
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Tubiana, C.
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Groussin, O.
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Boudreault, S.
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Höfner, S.
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Mottola, S.
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Barbieri, C.
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Lamy, P. L.
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Rodrigo, R.
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Koschny, D.
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Rickman, Hans
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A'Hearn, M.
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Agarwal, J.
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Barucci, M. A.
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Bertaux, J. -L
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Bertini, I.
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Cremonese, G.
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Da Deppo, V.
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Debei, S.
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De Cecco, M.
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Deller, J.
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El-Maarry, M. R.
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Gicquel, A.
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Gutierrez-Marque ...
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Gutierrez, P. J.
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Hofmann, M.
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Hviid, S. F.
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Ip, W. -H
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Jorda, L.
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Knollenberg, J.
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Kovacs, G.
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Kramm, J. -R
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Küppers, M.
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Lara, L. M.
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Lazzarin, M.
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Lopez-Moreno, J. ...
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Marzari, F.
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Naletto, G.
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Thomas, N.
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Uppsala University