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  Grain formation around the AGB star l2 puppis based on alma observations

Nuth, J., Ferguson, F., Homan, W., Decin, L., & Paquette, J. (2020). Grain formation around the AGB star l2 puppis based on alma observations. The Astrophysical Journal, 901(2): 144. doi:10.3847/1538-4357/abaefb.

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Item Permalink: http://hdl.handle.net/21.11116/0000-0007-547D-F Version Permalink: http://hdl.handle.net/21.11116/0000-0007-547E-E
Genre: Journal Article

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Nuth_2020_ApJ_901_144.pdf (Publisher version), 9MB
 
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 Creators:
Nuth, J.A., Author
Ferguson, F.T., Author
Homan, W., Author
Decin, L., Author
Paquette, John1, Author              
Affiliations:
1Department Planets and Comets, Max Planck Institute for Solar System Research, Max Planck Society, ou_1832288              

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Free keywords: Asymptotic giant branch stars ; Circumstellar dust ; Circumstellar envelopes
 Abstract: While models of grain formation in the outflows of carbon-rich stars have been relatively successful, models of outflows from oxygen-rich, asymptotic giant branch stars have been less fortunate. Under current modeling, it is difficult to produce sufficient amounts of silicate grains with high enough opacity to form a dust-driven wind from these stars. To investigate the cause of this difference, this work is a comparison between typical outflow model results and a model using input from Atacama Large Millimeter/submillimeter Array observations of L2 Puppis. The temperatures from these observations are much lower than would typically be used in the standard outflow model. In addition, the observed gas densities are much higher than predicted from typical outflow models. Both of these differences make the formation of silicate grains much more favorable than predicted in current outflow models. We then explore the effects of other possible nonideal conditions including the efficiency of cluster growth prior to nucleation, the efficiency of grain growth following nucleation and the variation of grain coupling to stellar radiation during grain growth. Finally, we calculate the potential enhancement in grain production based on possible increased refractory abundances resulting from the vaporization of millimeter-scale and larger particles left over from the presence of a former planetary system.

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Language(s): eng - English
 Dates: 2020
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Type: Peer
 Identifiers: DOI: 10.3847/1538-4357/abaefb
 Degree: -

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Title: The Astrophysical Journal
Source Genre: Journal
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Publ. Info: Bristol; Vienna : IOP Publishing; IAEA
Pages: - Volume / Issue: 901 (2) Sequence Number: 144 Start / End Page: - Identifier: ISSN: 0004-637X
CoNE: https://pure.mpg.de/cone/journals/resource/954922828215_3