Impact Features on Stardust: Implications for Comet 81P/Wild 2 Dust

Hörz, Friedrich; Bastien, Ron K.; Borg, J.; Bradley, J. P.; Bridges, J. C.; Brownlee, D. E.; Burchell, M. J.; Chi, Miaofang; Cintala, M. J.; Dai, Z. R.; Djouadi, Z.; Domínguez, G.; Economou, T.; Fairey, Sam A. J.; Floss, C.; Franchi, I. A.; Graham, G. A.; Green, Simon; Heck, Philipp R.; Hoppe, P.; Huth, J.; Ishii, H. A.; Kearsley, A. T.; Kissel, J.; Leitner, J.; Leroux, Hugues; Marhas, K. K.; Messenger, Keiko; Schwandt, C. S.; See, Thomas A.; Snead, C. J.; Stadermann, F. J.; Stephan, T.; Stroud, Rhonda M.; Teslich, N.; Trigo‐Rodríguez, Josep M.; Tuzzolino, A. J.; Tománek, David; Tsou, P.; Warren, Jack L.; Westphal, A. J.; Wozniakiewicz, P. J.; Wright, I. P.; Zinner, E.

doi:10.1126/science.1135705

Cited by 285 publications

(238 citation statements)

References 13 publications

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“…Significant variations of particle packing density ρ from 0.139 to 0.336 have only a minor impact on the negative polarization (Zubko et al 2011b), and we consider a packing density ρ = 0.236 in our calculations. When we consider that the bulk material density for refractory species in comets is in the range 1.5−3.5 g/cm 3 , the material density in agglomerated debris particles spans the range 0.35−0.83 g/cm 3 , which is consistent with what was determined from the microcraters in the aluminum foil that covered the Stardust sample collector: 0.3−3 g/cm 3 (e.g., Hörz et al 2006). …”

Section: Link With Chemical Composition Of Dustsupporting

confidence: 71%

Evaluating the carbon depletion found by the Stardust mission in Comet 81P/Wild 2

Zubko

Muinonen

Shkuratov³

et al. 2012

A&A

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The low abundance of refractory carbonaceous material in samples collected by Stardust in comet 81P/Wild 2 coma was completely unexpected. If these results are universal to other comets, this necessitates a reformulation of current models of solar system formation. A polarimetric imaging analysis demonstrates that dust is not uniformly distributed within cometary coma, and that the circumnucleus halo region where the dust samples were collected must contain a low population of carbonaceous particles. Such regions are seen in other comets, suggesting that comet 81P/Wild 2 is not unusual and that the anomalous lack of carbon is not necessarily representative of the entire coma.

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Section: Link With Chemical Composition Of Dustsupporting

confidence: 71%

Evaluating the carbon depletion found by the Stardust mission in Comet 81P/Wild 2

Zubko

Muinonen

Shkuratov³

et al. 2012

A&A

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“…Morphological analogs could be explored among collected extraterrestrial dust particles: 1) the chondritic porous aggregates, the ultrafine-grained matrix with occasional micron-sized iron-sulfide and/or Mg-rich olivine grains (Rietmeijer 2002); 2) cluster IDPs, a mixture of micron-sized grains and 5−20 micron sulfide and silicate minerals (Rietmeijer & Nuth 2004;Thomas et al 1995); and 3) giant cluster IDPs (Messenger et al 2015). GIADA fluffy lowdensity aggregates analogs among the Wild 2 particles could be the volatile-rich aggregates producing bulbous tracks (type C, Hörz et al 2006), in the capturing aerogel, leaving organic IR features along the track and carbon-rich small fragments completely scattered throughout the track (Sandford et al 2006;Rotundi et al 2008). Compact GIADA particles can be associated with Wild 2 dense mineral grains, forming type A carrotlike thin trails (e.g., Hörz et al 2006;Rotundi et al 2014), and/or to cluster IDPs carving type B bulbous trails ending in stylus tracks (e.g., Hörz et al 2006;Rotundi et al 2008).…”

Section: Discussionmentioning

confidence: 99%

GIADA: shining a light on the monitoring of the comet dust production from the nucleus of 67P/Churyumov-Gerasimenko

Corte

Rotundi

Fulle

et al. 2015

A&A

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oro.open.ac.uk Aims. We aim to describe the dust spatial distribution in the coma of comet 67P by means of in situ measurements. We determine dynamical and physical properties of cometary dust particles to support the study of the production process and dust environment modification. Methods. We analyzed GIADA data with respect to the observation geometry and heliocentric distance to describe the coma dust spatial distribution of 67P, to monitor its activity, and to retrieve information on active areas present on its nucleus. We combined GIADA detection information with calibration activity to distinguish different types of particles that populate the coma of 67P: compact particles and fluffy porous aggregates. By means of particle dynamical parameters measured by GIADA, we studied the dust acceleration region.Results. GIADA was able to distinguish different types of particles populating the coma of 67P: compact particles and fluffy porous aggregates. Most of the compact particle detections occurred at latitudes and longitudes where the spacecraft was in view of the comet's neck region of the nucleus, the so-called Hapi region. This resulted in an oscillation of the compact particle abundance with respect to the spacecraft position and a global increase as the comet moved from 3.36 to 2.43 AU heliocentric distance. The speed of these particles, having masses from 10 −10 to 10 −7 kg, ranged from 0.3 to 12.2 m s −1 . The variation of particle mass and speed distribution with respect to the distance from the nucleus gave indications of the dust acceleration region. The influence of solar radiation pressure on micron and submicron particles was studied. The integrated dust mass flux collected from the Sun direction, that is, particles reflected by solar radiation pressure, was three times higher than the flux coming directly from the comet nucleus. The awakening 67P comet shows a strong dust flux anisotropy, confirming what was suggested by on-ground dust coma observations performed in 2008.

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“…aluminium, aerogel). Several past and ongoing space missions such 47 as Stardust (Hörz, et al, 2006), Deep Impact (Lisse, et al, 2006) and Rosetta (Schulz,et al,48 2015) have gathered information close to cometary sources of dust. Stardust is the only 49 mission to date which captured dust particles ejected from a comet (81P Wild 2) and, after 50 deceleration and disruption in the aerogel (SiO2) collector (Trigo-Rodríguez and Llorca, 51 2007), returned them to Earth.…”

Section: Composition Morphology and Size Distribution Of Interplanetmentioning

confidence: 99%

Prognostic Value of Cardiovascular Magnetic Resonance and Single-Photon Emission Computed Tomography in Suspected Coronary Heart Disease: Long-Term Follow-up of a Prospective, Diagnostic Accuracy Cohort Study

et al. 2016

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11Analogues have been developed and characterised for both interplanetary dust and 12 meteoric smoke particles. These include amorphous materials with elemental compositions 13 similar to the olivine mineral solid solution series, a variety of iron oxides, undifferentiated 14 meteorites (chondrites) and minerals which can be considered good terrestrial proxies to 15 some phases present in meteorites. The products have been subjected to a suite of 16 analytical techniques to demonstrate their suitability as analogues for the target materials. 17

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Impact Features on Stardust: Implications for Comet 81P/Wild 2 Dust

Cited by 285 publications

References 13 publications

Evaluating the carbon depletion found by the Stardust mission in Comet 81P/Wild 2

Evaluating the carbon depletion found by the Stardust mission in Comet 81P/Wild 2

GIADA: shining a light on the monitoring of the comet dust production from the nucleus of 67P/Churyumov-Gerasimenko

Prognostic Value of Cardiovascular Magnetic Resonance and Single-Photon Emission Computed Tomography in Suspected Coronary Heart Disease: Long-Term Follow-up of a Prospective, Diagnostic Accuracy Cohort Study

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