Redistribution of particles across the nucleus of comet 67P/Churyumov-Gerasimenko

被引：155

作者：

Thomas, N. ^{[1
]}

Davidsson, B. ^{[2
]}

El-Maarry, M. R. ^{[1
]}

Fornasier, S. ^{[3
]}

Giacomini, L. ^{[4
]}

Gracia-Berna, A. G. ^{[1
]}

Hviid, S. F. ^{[5
]}

Ip, W. -H. ^{[6
]}

Jorda, L. ^{[7
]}

Keller, H. U. ^{[5
,8
]}

Knollenberg, J. ^{[5
]}

Kuehrt, E. ^{[5
]}

La Forgia, F. ^{[12
]}

Lai, I. L. ^{[6
]}

Liao, Y. ^{[1
]}

Marschall, R. ^{[1
]}

Massironi, M. ^{[4
]}

Mottola, S. ^{[5
]}

Pajola, M. ^{[9
]}

Poch, O. ^{[1
]}

Pommerol, A. ^{[1
]}

Preusker, F. ^{[5
]}

Scholten, F. ^{[5
]}

Su, C. C. ^{[10
]}

Wu, J. S. ^{[10
]}

Vincent, J. -B. ^{[11
]}

Sierks, H. ^{[11
]}

Barbieri, C. ^{[12
]}

Lamy, P. L. ^{[7
]}

Rodrigo, R. ^{[13
,14
]}

Koschny, D. ^{[15
]}

Rickman, H. ^{[16
,17
]}

A'Hearn, M. F. ^{[18
]}

Barucci, M. A. ^{[3
]}

Bertaux, J. -L. ^{[19
]}

Bertini, I. ^{[12
]}

Cremonese, G. ^{[20
]}

Da Deppo, V. ^{[21
]}

Debei, S. ^{[22
]}

de Cecco, M. ^{[23
]}

Fulle, M. ^{[24
]}

Groussin, O. ^{[7
]}

Gutierrez, P. J. ^{[25
]}

Kramm, J. -R. ^{[11
]}

Kueppers, M. ^{[26
]}

Lara, L. M. ^{[25
]}

Lazzarin, M. ^{[12
]}

Lopez Moreno, J. J. ^{[25
]}

Marzari, F. ^{[12
]}

Michalik, H. ^{[27
]}

机构：

[1] Univ Bern, Inst Phys, CH-3012 Bern, Switzerland

[2] Uppsala Univ, Dept Phys & Astron, S-75120 Uppsala, Sweden

[3] Univ Paris Diderot, Univ Paris 06, Observ Paris, LESIA,CNRS, F-92195 Meudon, France

[4] Univ Padua, Dipartimento Geosci, I-35131 Padua, Italy

[5] Deutsch Zentrum Luft & Raumfahrt DLR, Inst Planetenforsch Asteroiden & Kometen, D-12489 Berlin, Germany

[6] Natl Cent Univ, Grad Inst Astron, Chungli 32054, Taiwan

[7] Lab Astrophys Marseille, F-13388 Marseille 13, France

[8] Tech Univ Carolo Wilhelmina Braunschweig, Inst Geophys & Extraterr Phys, D-38106 Braunschweig, Germany

[9] Univ Padua, Ctr Ateneo Studi & Att Spaziali, Giuseppe Colombo CISAS, I-35131 Padua, Italy

[10] Natl Chiao Tung Univ, Dept Mech Engn, Hsinchu 30010, Taiwan

[11] Max Planck Inst Sonnensyst Forsch, D-37077 Gottingen, Germany

[12] Dipartimento Fis & Astron G Galilei, I-35122 Padua, Italy

[13] Int Space Sci Inst, CH-3012 Bern, Switzerland

[14] CSIC INTA, Ctr Astrobiol, Madrid 28850, Spain

[15] European Space Agcy, Sci Support Off, NL-2201 Noordwijk, Netherlands

[16] Uppsala Univ, Dept Phys & Astron, S-75120 Uppsala, Sweden

[17] PAS Space Res Ctr, PL-00716 Warsaw, Poland

[18] Univ Maryland, Dept Astron, College Pk, MD 20742 USA

[19] CNRS UVSQ IPSL, LATMOS, F-78280 Guyancourt, France

[20] INAF Osservatorio Astron Padova, I-35122 Padua, Italy

[21] CNR IFN UOS Padova LUXOR, I-35131 Padua, Italy

[22] Univ Padua, Dept Mech Engn, I-35131 Padua, Italy

[23] Univ Trento, UNITN, I-38100 Trento, Italy

[24] INAF Osservatorio Astrofis, I-34014 Trieste, Italy

[25] Inst Astrofis Andalucia CSIC, Granada 18008, Spain

[26] European Space Astron Ctr ESA, Sci Operat Dept, Madrid 28691, Spain

[27] Inst Datentech & Kommunikat Netze, D-38106 Braunschweig, Germany

来源：

ASTRONOMY & ASTROPHYSICS | 2015年 / 583卷

基金：

瑞士国家科学基金会;

关键词：

space vehicles: instruments; comets: individual: 67P/Churyumov-Gerasimenko; techniques: image processing; hydrodynamics; THERMAL-PROPERTIES; SURFACE-ROUGHNESS; PONDED DEPOSITS; MONTE-CARLO; INNER COMA; DUST; GEOMORPHOLOGY; DYNAMICS; MARS; TEMPERATURE;

D O I：

10.1051/0004-6361/201526049

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Context. We present an investigation of the surface properties of areas on the nucleus of comet 67P/Churyumov-Gerasimenko. Aims. We aim to show that transport of material from one part of the cometary nucleus to another is a significant mechanism that influences the appearance of the nucleus and the surface thermal properties. Methods. We used data from the OSIRIS imaging system onboard the Rosetta spacecraft to identify surface features on the nucleus that can be produced by various transport mechanisms. We used simple calculations based on previous works to establish the plausibility of dust transport from one part of the nucleus to another. Results. We show by observation and modeling that "airfall" as a consequence of non-escaping large particles emitted from the neck region of the nucleus is a plausible explanation for the smooth thin deposits in the northern hemisphere of the nucleus. The consequences are also discussed. We also present observations of aeolian ripples and ventifacts. We show by numerical modeling that a type of saltation is plausible even under the rarified gas densities seen at the surface of the nucleus. However, interparticle cohesive forces present difficulties for this model, and an alternative mechanism for the initiation of reptation and creep may result from the airfall mechanism. The requirements on gas density and other parameters of this alternative make it a more attractive explanation for the observations. The uncertainties and implications are discussed.

引用

页数：18

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