Titre :

Comet 81P/Wild 2: The size distribution of finer (sub-10 μm) dust collected by the Stardust spacecraft

Auteur(s) :

Price, Mark C. [Auteur]
School of Physical Sciences [Canterbury]
Kearsley, Anton T. [Auteur]
The Natural History Museum [London] [NHM]
Burchell, Mark J. [Auteur]
University of Kent [Canterbury]
Hörz, Friedrich [Auteur]
NASA Johnson Space Center [JSC]
Borg, Janet [Auteur]
Institut d'astrophysique spatiale [IAS]
Bridges, John C. [Auteur]
Space Research Centre [Leicester]
Cole, M.J. [Auteur]
University of Kent [Canterbury]
Floss, Christine [Auteur]

Graham, Giles A. [Auteur]
The Natural History Museum [London] [NHM]
Green, Simon F. [Auteur]
School of Physical Sciences [Milton Keynes]
Hoppe, Peter [Auteur]
Leroux, Hugues [Auteur]
Unité Matériaux et Transformations - UMR 8207 [UMET]
Marhas, Kuljeet [Auteur]

Park, N. [Auteur]
AWE Aldermaston
Stroud, R. [Auteur]
Naval Research Laboratory [NRL]
Stadermann, Frank J. [Auteur]

Telisch, N. [Auteur]
Lawrence Livermore National Laboratory [LLNL]
Wozniakiewicz, Penelope [Auteur]
Lawrence Livermore National Laboratory [LLNL]

Titre de la revue :

Meteoritics and Planetary Science

Numéro :

45

Pagination :

1409-1428

Date de publication :

2010

Discipline(s) HAL :

Planète et Univers [physics]/Astrophysique [astro-ph]
Physique [physics]/Matière Condensée [cond-mat]/Science des matériaux [cond-mat.mtrl-sci]
Physique [physics]/Astrophysique [astro-ph]
Planète et Univers [physics]/Sciences de la Terre
Chimie/Matériaux
Physique [physics]/Physique [physics]/Géophysique [physics.geo-ph]

Résumé en anglais : [en]

Abstract– The fluence of dust particles <10 μm in diameter was recorded by impacts on aluminum foil of the NASA Stardust spacecraft during a close flyby of comet 81P/Wild 2 in 2004. Initial interpretation of craters for ...
Lire la suite >Abstract– The fluence of dust particles <10 μm in diameter was recorded by impacts on aluminum foil of the NASA Stardust spacecraft during a close flyby of comet 81P/Wild 2 in 2004. Initial interpretation of craters for impactor particle dimensions and mass was based upon laboratory experimental simulations using projectiles less than >10 μm in diameter and the resulting linear relationship of projectile to crater diameter was extrapolated to smaller sizes. We now describe a new experimental calibration program firing very small monodisperse silica projectiles (470 nm–10 μm) at approximately 6 km s−1. The results show an unexpected departure from linear relationship between 1 and 10 μm. We collated crater measurement data and, where applicable, impactor residue data for 596 craters gathered during the postmission preliminary examination phase. Using the new calibration, we recalculate the size of the particle responsible for each crater and hence reinterpret the cometary dust size distribution. We find a greater flux of small particles than previously reported. From crater morphology and residue composition of a subset of craters, the internal structure and dimensions of the fine dust particles are inferred and a “maximum‐size” distribution for the subgrains composing aggregate particles is obtained. The size distribution of the small particles derived directly from the measured craters peaks at approximately 175 nm, but if this is corrected to allow for aggregate grains, the peak in subgrain sizes is at <100 nm.Lire moins >

Langue :

Anglais

Comité de lecture :

Oui

Audience :

Internationale

Vulgarisation :

Non

Établissement(s) :

Université de Lille
ENSCL
CNRS
INRA

Collections :

• Unité Matériaux et Transformations (UMET) - UMR 8207

Équipe(s) de recherche :

Matériaux Terrestres et Planétaires

Date de dépôt :

2019-05-16T15:14:48Z
2021-03-02T15:04:24Z