Sticking Properties of Silicates in Planetesimal Formation Revisited. (arXiv:1905.11864v1 [astro-ph.EP])
<a href="http://arxiv.org/find/astro-ph/1/au:+Steinpilz_T/0/1/0/all/0/1">Tobias Steinpilz</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Teiser_J/0/1/0/all/0/1">Jens Teiser</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Wurm_G/0/1/0/all/0/1">Gerhard Wurm</a>
In the past, laboratory experiments and theoretical calculations showed a
mismatch in derived sticking properties of silicates in the context of
planetesimal formation. It has been proposed by Kimura et al. (2015) 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. (2015). Dry samples show increased strengths by a factor of up
to 10 over wet samples. A high value of $gamma = 0.2 J/m^2$ likely applies to
the dry low pressure conditions of protoplanetary disks and should be used in
the future.
In the past, laboratory experiments and theoretical calculations showed a
mismatch in derived sticking properties of silicates in the context of
planetesimal formation. It has been proposed by Kimura et al. (2015) 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. (2015). Dry samples show increased strengths by a factor of up
to 10 over wet samples. A high value of $gamma = 0.2 J/m^2$ likely applies to
the dry low pressure conditions of protoplanetary disks and should be used in
the future.
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