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Forming Chondrules in Impact Splashes. I. radiative Cooling Model

Dullemond, Cornelis Petrus; Stammler, Sebastian Markus and Johansen, Anders LU (2014) In Astrophysical Journal 794(1).
Abstract
The formation of chondrules is one of the oldest unsolved mysteries in meteoritics and planet formation. Recently an old idea has been revived: the idea that chondrules form as a result of collisions between planetesimals in which the ejected molten material forms small droplets that solidify to become chondrules. Pre-melting of the planetesimals by radioactive decay of Al-26 would help produce sprays of melt even at relatively low impact velocity. In this paper we study the radiative cooling of a ballistically expanding spherical cloud of chondrule droplets ejected from the impact site. We present results from numerical radiative transfer models as well as analytic approximate solutions. We find that the temperature after the start of the... (More)
The formation of chondrules is one of the oldest unsolved mysteries in meteoritics and planet formation. Recently an old idea has been revived: the idea that chondrules form as a result of collisions between planetesimals in which the ejected molten material forms small droplets that solidify to become chondrules. Pre-melting of the planetesimals by radioactive decay of Al-26 would help produce sprays of melt even at relatively low impact velocity. In this paper we study the radiative cooling of a ballistically expanding spherical cloud of chondrule droplets ejected from the impact site. We present results from numerical radiative transfer models as well as analytic approximate solutions. We find that the temperature after the start of the expansion of the cloud remains constant for a time t(cool) and then drops with time t approximately as T similar or equal to T-0[(315)t/t(cool)+ 2/5](-5/3) for t > t(cool). The time at which this temperature drop starts t(cool) depends via an analytical formula on the mass of the cloud, the expansion velocity, and the size of the chondrule. During the early isothermal expansion phase the density is still so high that we expect the vapor of volatile elements to saturate so that no large volatile losses are expected. (Less)
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organization
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type
Contribution to journal
publication status
published
subject
keywords
meteorites, radiative transfer, meteors, meteoroids
in
Astrophysical Journal
volume
794
issue
1
publisher
University of Chicago Press
external identifiers
  • wos:000342581200091
  • scopus:84907573676
ISSN
0004-637X
DOI
10.1888/0004-637X/794/1/91
language
English
LU publication?
yes
id
20ddfb7c-da73-4ab4-a5f5-c0be77f5e833 (old id 4796296)
date added to LUP
2014-11-24 16:38:43
date last changed
2017-10-01 04:31:37
@article{20ddfb7c-da73-4ab4-a5f5-c0be77f5e833,
  abstract     = {The formation of chondrules is one of the oldest unsolved mysteries in meteoritics and planet formation. Recently an old idea has been revived: the idea that chondrules form as a result of collisions between planetesimals in which the ejected molten material forms small droplets that solidify to become chondrules. Pre-melting of the planetesimals by radioactive decay of Al-26 would help produce sprays of melt even at relatively low impact velocity. In this paper we study the radiative cooling of a ballistically expanding spherical cloud of chondrule droplets ejected from the impact site. We present results from numerical radiative transfer models as well as analytic approximate solutions. We find that the temperature after the start of the expansion of the cloud remains constant for a time t(cool) and then drops with time t approximately as T similar or equal to T-0[(315)t/t(cool)+ 2/5](-5/3) for t > t(cool). The time at which this temperature drop starts t(cool) depends via an analytical formula on the mass of the cloud, the expansion velocity, and the size of the chondrule. During the early isothermal expansion phase the density is still so high that we expect the vapor of volatile elements to saturate so that no large volatile losses are expected.},
  articleno    = {91},
  author       = {Dullemond, Cornelis Petrus and Stammler, Sebastian Markus and Johansen, Anders},
  issn         = {0004-637X},
  keyword      = {meteorites,radiative transfer,meteors,meteoroids},
  language     = {eng},
  number       = {1},
  publisher    = {University of Chicago Press},
  series       = {Astrophysical Journal},
  title        = {Forming Chondrules in Impact Splashes. I. radiative Cooling Model},
  url          = {http://dx.doi.org/10.1888/0004-637X/794/1/91},
  volume       = {794},
  year         = {2014},
}