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

Yuki Klmura, Joseph A. Nuth

Research output: Contribution to journalArticlepeer-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 languageEnglish
Pages (from-to)637-641
Number of pages5
JournalAstrophysical Journal
Volume630
Issue number1 I
DOIs
Publication statusPublished - 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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