Laboratory synthesized calcium oxide and calcium hydroxide grains: A candidate to explain the 6.8 μm band

Yuki Klmura; Joseph A. Nuth

doi:10.1086/431965

Laboratory synthesized calcium oxide and calcium hydroxide grains: A candidate to explain the 6.8 μm band

Yuki Klmura, Joseph A. Nuth

SCI - Earth Science

Research output: Contribution to journal › Article › peer-review

7 Citations (Scopus)

Abstract

We demonstrate that CaO and Ca(OH)₂ are excellent candidates to explain the 6.8 μm feature, which is one of the most obscure features in young stellar objects. We discuss the condensation of CaO grains and the potential formation of a Ca(OH)₂ surface layer. The infrared spectra of these grains are compared with the spectra of 15 young stellar objects. We note that CaO-rich grains are seen in all meteoritic CAIs (calcium-aluminum-rich inclusions) and that the 6.8 μm feature has only been observed in young stellar objects. Therefore, we consider CaO grains to be a plausible candidate to explain the 6.8 μm feature and hypothesize that they are produced in the hot interiors of young stellar environments.

Original language	English
Pages (from-to)	637-641
Number of pages	5
Journal	Astrophysical Journal
Volume	630
Issue number	1 I
DOIs	https://doi.org/10.1086/431965
Publication status	Published - 2005 Sep 1

Keywords

Astrochemistry
ISM: molecules
Methods: laboratory
Molecular data

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

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10.1086/431965

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title = "Laboratory synthesized calcium oxide and calcium hydroxide grains: A candidate to explain the 6.8 μm band",

abstract = "We demonstrate that CaO and Ca(OH)2 are excellent candidates to explain the 6.8 μm feature, which is one of the most obscure features in young stellar objects. We discuss the condensation of CaO grains and the potential formation of a Ca(OH)2 surface layer. The infrared spectra of these grains are compared with the spectra of 15 young stellar objects. We note that CaO-rich grains are seen in all meteoritic CAIs (calcium-aluminum-rich inclusions) and that the 6.8 μm feature has only been observed in young stellar objects. Therefore, we consider CaO grains to be a plausible candidate to explain the 6.8 μm feature and hypothesize that they are produced in the hot interiors of young stellar environments.",

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T1 - Laboratory synthesized calcium oxide and calcium hydroxide grains

T2 - A candidate to explain the 6.8 μm band

AU - Klmura, Yuki

AU - Nuth, Joseph A.

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N2 - We demonstrate that CaO and Ca(OH)2 are excellent candidates to explain the 6.8 μm feature, which is one of the most obscure features in young stellar objects. We discuss the condensation of CaO grains and the potential formation of a Ca(OH)2 surface layer. The infrared spectra of these grains are compared with the spectra of 15 young stellar objects. We note that CaO-rich grains are seen in all meteoritic CAIs (calcium-aluminum-rich inclusions) and that the 6.8 μm feature has only been observed in young stellar objects. Therefore, we consider CaO grains to be a plausible candidate to explain the 6.8 μm feature and hypothesize that they are produced in the hot interiors of young stellar environments.

AB - We demonstrate that CaO and Ca(OH)2 are excellent candidates to explain the 6.8 μm feature, which is one of the most obscure features in young stellar objects. We discuss the condensation of CaO grains and the potential formation of a Ca(OH)2 surface layer. The infrared spectra of these grains are compared with the spectra of 15 young stellar objects. We note that CaO-rich grains are seen in all meteoritic CAIs (calcium-aluminum-rich inclusions) and that the 6.8 μm feature has only been observed in young stellar objects. Therefore, we consider CaO grains to be a plausible candidate to explain the 6.8 μm feature and hypothesize that they are produced in the hot interiors of young stellar environments.

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KW - ISM: molecules

KW - Methods: laboratory

KW - Molecular data

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