Redistribution of particles across the nucleus of comet 67P/Churyumov-Gerasimenko
Nicholas Thomas
(1)
,
B. Davidsson
(2)
,
Mohamed Ramy El-Maarry
(1)
,
Sonia Fornasier
(3, 4)
,
L. Giacomini
(5)
,
A.G. Gracia Berna
(1)
,
S.F. Hviid
(6)
,
W.-H. Ip
(7)
,
Laurent Jorda
(8)
,
H.U. Keller
(9)
,
J. Knollenberg
(6)
,
Ekkehard Kührt
(6)
,
F. La Forgia
(10)
,
I.L. Lai
(7)
,
Y. Liao
,
R. Marschall
(1)
,
Matteo Massironi
(5)
,
S. Mottola
(6)
,
Maurizio Pajola
(11)
,
O. Poch
(1)
,
A. Pommerol
(1)
,
Frank Preusker
(6)
,
Frank Scholten
(6)
,
C.C. Su
(12)
,
J.S. Wu
(12)
,
J.-B. Vincent
(13)
,
Holger Sierks
(13)
,
C. Barbieri
(10)
,
P.L. Lamy
(8)
,
R. Rodrigo
(14, 15)
,
D. Koschny
(16)
,
H. Rickman
(2)
,
Michael F. A'Hearn
(17)
,
M. Antonella Barucci
(4)
,
Jean-Loup Bertaux
(18)
,
Ivano Bertini
(11)
,
Gabriele Cremonese
(19)
,
V. da Deppo
(20)
,
S. Debei
(21)
,
M. de Cecco
(22)
,
Marco Fulle
(23)
,
O. Groussin
(8)
,
Pedro J. Gutiérrez
(24)
,
J.-R. Kramm
(13)
,
Michael Küppers
(25)
,
L. M. Lara
(24)
,
M. Lazzarin
(10)
,
J. J. Lopez Moreno
(24)
,
Francesco Marzari
(10)
,
Harald Michalik
(26)
,
Giampiero Naletto
(11, 21, 20)
,
Jessica Agarwal
(13)
,
C. Güttler
(13)
,
N. Oklay
(13)
,
Cecilia Tubiana
(13)
1
Physikalisches Institut [Bern]
2 Department of Physics and Astronomy [Uppsala]
3 UPD7 - Université Paris Diderot - Paris 7
4 LESIA - Laboratoire d'études spatiales et d'instrumentation en astrophysique
5 Dipartimento di Geoscienze [Padova]
6 DLR Institute of Planetary Research
7 IANCU - Institute of Astronomy [Taiwan]
8 LAM - Laboratoire d'Astrophysique de Marseille
9 IGEP - Institut für Geophysik und Extraterrestrische Physik [Braunschweig]
10 Dipartimento di Fisica e Astronomia "Galileo Galilei"
11 CISAS - Centro di Ateneo di Studi e Attività Spaziali “Giuseppe Colombo”
12 Department of Mechanical Engineering [NCTU]
13 MPS - Max-Planck-Institut für Sonnensystemforschung = Max Planck Institute for Solar System Research
14 CAB - Centro de Astrobiologia [Madrid]
15 ISSI - International Space Science Institute [Bern]
16 RSSD - Research and Scientific Support Department, ESTEC
17 Department of Astronomy [College Park]
18 PLANETO - LATMOS
19 OAPD - INAF - Osservatorio Astronomico di Padova
20 IFN - CNR Institute for Photonics and Nanotechnologies
21 Department of Industrial Engineering [Padova]
22 UNITN - Università degli Studi di Trento = University of Trento
23 OAT - INAF - Osservatorio Astronomico di Trieste
24 IAA - Instituto de Astrofísica de Andalucía
25 Operations Department (ESAC)
26 Institut für Datentechnik und Kommunikationsnetze
2 Department of Physics and Astronomy [Uppsala]
3 UPD7 - Université Paris Diderot - Paris 7
4 LESIA - Laboratoire d'études spatiales et d'instrumentation en astrophysique
5 Dipartimento di Geoscienze [Padova]
6 DLR Institute of Planetary Research
7 IANCU - Institute of Astronomy [Taiwan]
8 LAM - Laboratoire d'Astrophysique de Marseille
9 IGEP - Institut für Geophysik und Extraterrestrische Physik [Braunschweig]
10 Dipartimento di Fisica e Astronomia "Galileo Galilei"
11 CISAS - Centro di Ateneo di Studi e Attività Spaziali “Giuseppe Colombo”
12 Department of Mechanical Engineering [NCTU]
13 MPS - Max-Planck-Institut für Sonnensystemforschung = Max Planck Institute for Solar System Research
14 CAB - Centro de Astrobiologia [Madrid]
15 ISSI - International Space Science Institute [Bern]
16 RSSD - Research and Scientific Support Department, ESTEC
17 Department of Astronomy [College Park]
18 PLANETO - LATMOS
19 OAPD - INAF - Osservatorio Astronomico di Padova
20 IFN - CNR Institute for Photonics and Nanotechnologies
21 Department of Industrial Engineering [Padova]
22 UNITN - Università degli Studi di Trento = University of Trento
23 OAT - INAF - Osservatorio Astronomico di Trieste
24 IAA - Instituto de Astrofísica de Andalucía
25 Operations Department (ESAC)
26 Institut für Datentechnik und Kommunikationsnetze
Laurent Jorda
- Fonction : Auteur
- PersonId : 746464
- IdHAL : laurent-jorda
- ORCID : 0000-0001-8735-3308
- IdRef : 180975161
Y. Liao
- Fonction : Auteur
Maurizio Pajola
- Fonction : Auteur
- PersonId : 767226
- ORCID : 0000-0002-3144-1277
Michael Küppers
- Fonction : Auteur
- PersonId : 757030
- ORCID : 0000-0002-5666-8582
Résumé
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 nu- cleus 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.
Origine | Fichiers éditeurs autorisés sur une archive ouverte |
---|
Loading...