Meter-scale thermal contraction crack polygons on the nucleus of comet 67P/Churyumov-Gerasimenko

被引：30

作者：

Auger, A. -T. ^{[1
,2
]}

Groussin, O. ^{[1
]}

Jorda, L. ^{[1
]}

El-Maarry, M. R. ^{[3
]}

Bouley, S. ^{[2
,4
]}

Sejourne, A. ^{[2
]}

Gaskell, R. ^{[5
]}

Capanna, C. ^{[1
]}

Davidsson, B. ^{[6
]}

Marchi, S. ^{[7
]}

Hoefner, S. ^{[8
]}

Lamy, P. L. ^{[1
]}

Sierks, H. ^{[8
]}

Barbieri, C. ^{[9
]}

Rodrigo, R. ^{[10
,11
]}

Koschny, D. ^{[12
]}

Rickman, H. ^{[6
,13
]}

Keller, H. U. ^{[14
]}

Agarwal, J. ^{[8
]}

A'Hearn, M. F. ^{[15
]}

Barucci, M. A. ^{[16
]}

Bertaux, J. -L. ^{[17
]}

Bertini, I. ^{[18
]}

Cremonese, G. ^{[19
]}

Da Deppo, V. ^{[20
]}

Debei, S. ^{[19
]}

De Cecco, M. ^{[21
]}

Fornasier, S.

Fulle, M. ^{[22
]}

Gutierrez, P. J. ^{[23
]}

Guettler, C. ^{[8
]}

Hviid, S. ^{[24
]}

Ip, W. -H. ^{[25
]}

Knollenberg, J. ^{[24
]}

Kramm, J. -R. ^{[8
]}

Kuehrt, E. ^{[24
]}

Kuppers, M. ^{[26
]}

Lara, L. M. ^{[23
]}

Lazzarin, M. ^{[9
]}

Moreno, J. J. Lopez ^{[23
]}

Marzari, F. ^{[9
]}

Massironi, M. ^{[27
,28
]}

Michalik, H. ^{[29
]}

Naletto, G. ^{[18
,20
,30
]}

Oklay, N. ^{[8
]}

Pommerol, A. ^{[3
]}

Sabau, L. ^{[31
]}

Thomas, N. ^{[3
]}

Tubiana, C. ^{[8
]}

Vincent, J. -B. ^{[8
]}

机构：

[1] Aix Marseille Univ, CNRS, LAM, Lab Astrophys Marseille, Marseille, France

[2] Univ Paris Sud, Univ Paris Saclay, CNRS, GEOPS, Rue Belvdre,Bt 504-509, F-91405 Orsay, France

[3] Univ Bern, Phys Inst, Sidler Str 5, CH-3012 Bern, Switzerland

[4] Inst Mecan Celeste & Calcul Ephemerides, UMR8028, 77 Ave Denfert Rochereau, F-75014 Paris, France

[5] Planetary Sci Inst, Tucson, AZ USA

[6] Jet Prop Lab, M S 183-301,4800 Oak Grove Dr, Pasadena, CA USA

[7] Southwest Res Inst, 1050 Walnut St, Boulder, CO 80302 USA

[8] Max Planck Inst Sonnensystforsch, D-37077 Gottingen, Germany

[9] Padova Univ, Dept Phys & Astron, Vicolo Osservatorio 3, I-35122 Padua, Italy

[10] Ctr Astrobiol INTA CSIC, Madrid 28691, Spain

[11] Int Space Sci Inst, Haller Stra 6, CH-3012 Bern, Switzerland

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

[13] PAS Space Res Ctr, Bartycka 18A, PL-00716 Warsaw, Poland

[14] TU Braunschweig, Inst Geophys & Extraterr Phys, D-38106 Braunschweig, Germany

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

[16] Univ Paris Diderot, Univ Paris 06, CNRS, LESIA,Obs Paris, 5 Pl J Janssen, F-92195 Meudon, France

[17] CNRS, UVSQ, IPSL, LATMOS, 11 Blvd Alembert, F-78280 Guyancourt, France

[18] Univ Padua, CISAS, Via Venezia 15, I-35100 Padua, Italy

[19] Univ Padua, Dept Mech Engn, Via Venezia 1, I-35131 Padua, Italy

[20] CNR IFN UOS Padova LUXOR, Via Trasea 7, I-35131 Padua, Italy

[21] Univ Trento, UNITN, Via Mesiano 77, I-38100 Trento, Italy

[22] INAF Osservatorio Astron, Via Tiepolo 11, I-34143 Trieste, Italy

[23] Inst Astrofis Andalucia, CSIC, Glorieta Astron S-N, E-18008 Granada, Spain

[24] Inst Planetary Res, DLR, Rutherford Str 2, D-12489 Berlin, Germany

[25] Nat Cent Univ, Inst Space Sci, 300 Chung Rd, Chungli 32054, Taiwan

[26] European Space Astron Ctr ESA, Operat Dept, POB 78, Madrid 28691, Spain

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

[28] Univ Padua, Ctr Ateneo Studi Attivita Spaziali Giuseppe Colom, I-35131 Padua, Italy

[29] TU Braunschweig, Inst Datentechnik & Kommunikationsnetze, Hans Sommer Str 66, D-38106 Braunschweig, Germany

[30] Univ Padua, Dept Informat Engn, Via Gradenigo 6-B, I-35131 Padua, Italy

[31] Inst Nacl Tecn Aeroespacial, Carretera Ajalvir,PK 4, Madrid 28850, Spain

来源：

ICARUS | 2018年 / 301卷

关键词：

Comets; Nucleus; Geological processes; BEACON VALLEY; GLACIER ICE; MARS; SUBLIMATION; EVOLUTION; SURFACE; PERMAFROST; FEATURES; FATIGUE; SHAPES;

D O I：

10.1016/j.icarus.2017.09.037

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We report on the detection and characterization of more than 6300 polygons on the surface of the nucleus of comet 67P/Churyumov-Gerasimenko, using images acquired by the OSIRIS camera onboard Rosetta between August 2014 and March 2015. They are found in consolidated terrains and grouped in localized networks. They are present at all latitudes (from North to South) and longitudes (head, neck, and body), sometimes on pit walls or following lineaments. About 1.5% of the observed surface is covered by polygons. Polygons have an homogeneous size across the nucleus, with 90% of them in the size range 1 - 5 m and a mean size of 3.0 +/- 1.4 m. They show different morphologies, depending on the width and depth of their trough. They are found in networks with 3- or 4-crack intersection nodes. The polygons observed on 67P are consistent with thermal contraction crack polygons formed by the diurnal or seasonal temperature variations in a hard (MPa) and consolidated sintered layer of water ice, located a few centimeters below the surface. Our thermal analysis shows an evolution of thermal contraction crack polygons according to the local thermal environment, with more evolved polygons (i.e. deeper and larger troughs) where the temperature and the diurnal and seasonal temperature range are the highest. Thermal contraction crack polygons are young surface morphologies that probably formed after the injection of 67P in the inner solar system, typically 100,000 years ago, and could be as young as a few orbital periods, following the decreasing of its perihelion distance in 1959 from 2.7 to 1.3 a.u. Meter scale thermal contraction crack polygons should be common features on the nucleus of Jupiter family comets. (C) 2017 Elsevier Inc. All rights reserved.

引用

页码：173 / 188

页数：16

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