Sticking Properties of Silicates in Planetesimal Formation Revisited

In the past, laboratory experiments and theoretical calculations showed a mismatch in the derived sticking properties of silicates in the context of planetesimal formation. It has been proposed by Kimura et al. that this mismatch is due to the value of the surface energy assumed, supposedly correlat...

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Veröffentlicht in:	The Astrophysical journal 2019-03, Vol.874 (1), p.60
Hauptverfasser:	Steinpilz, Tobias, Teiser, Jens, Wurm, Gerhard
Format:	Artikel
Sprache:	eng
Schlagworte:	Astrophysics Disks Laboratory experiments Low pressure methods: miscellaneous Moisture content Planet formation Planets planets and satellites: formation planets and satellites: fundamental parameters Protoplanetary disks Protoplanets Silicates Surface energy Tensile strength Thickness Water content
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description	In the past, laboratory experiments and theoretical calculations showed a mismatch in the derived sticking properties of silicates in the context of planetesimal formation. It has been proposed by Kimura et al. that this mismatch is due to the value of the surface energy assumed, supposedly correlated to the presence or lack of water layers of different thickness on a grain's surface. We present tensile strength measurements of dust aggregates with different water content here. The results are in support of the suggestion by Kimura et al. Dry samples show increased strengths by a factor of up to 10 over wet samples. A high value of γ = 0.2 J m−2 likely applies to the dry low pressure conditions of protoplanetary disks and should be used in the future.
doi_str_mv	10.3847/1538-4357/ab07bb
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subjects	Astrophysics Disks Laboratory experiments Low pressure methods: miscellaneous Moisture content Planet formation Planets planets and satellites: formation planets and satellites: fundamental parameters Protoplanetary disks Protoplanets Silicates Surface energy Tensile strength Thickness Water content
title	Sticking Properties of Silicates in Planetesimal Formation Revisited
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