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  • 标题:K–H2 line shapes for the spectra of cool brown dwarfs
  • 本地全文:下载
  • 作者:N. F. Allard ; N. F. Allard ; F. Spiegelman
  • 期刊名称:Astronomy & Astrophysics
  • 印刷版ISSN:0004-6361
  • 电子版ISSN:1432-0746
  • 出版年度:2016
  • 卷号:589
  • 页码:1-6
  • DOI:10.1051/0004-6361/201628270
  • 语种:English
  • 出版社:EDP Sciences
  • 摘要:Observations of cooler and cooler brown dwarfs show that the contribution from broadening at many bars pressure is becoming important. The opacity in the red optical to near-IR region under these conditions is dominated by the extremely pressure-broadened wings of the alkali resonance lines, in particular, the K I resonance doublet at 0.77 μm. Collisions with H2 are preponderant in brown dwarf atmospheres at an effective temperature of about 1000 K; the H2 perturber densities reach several 1019 even in Jupiter-mass planets and exceed 1020 for super-Jupiters and older Y dwarfs. As a consequence, it appears that when the far wing absorption due to alkali atoms in a dense H2 atmosphere is significant, accurate pressure broadened profiles that are valid at high densities of H2 should be incorporated into spectral models.
  • 关键词:line: profiles;brown dwarfs
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