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Laser Guide Star Adaptive Optics Imaging Polarimetry of Herbig Ae/Be Stars

Authors
  • Perrin, Marshall D.
  • Graham, James R.
  • Paul Kalas
  • Lloyd, James P.
  • Max, Claire E.
  • Gavel, Donald T.
  • Pennington, Deanna M.
  • Gates, Elinor L.
Type
Published Article
Publication Date
Feb 25, 2004
Submission Date
Feb 25, 2004
Identifiers
DOI: 10.1126/science.1094602
arXiv ID: astro-ph/0402615
Source
SETI Institute
License
Unknown
External links

Abstract

We have used laser guide star adaptive optics and a near-infrared dual-channel imaging polarimeter to observe light scattered in the circumstellar environment of Herbig Ae/Be stars on scales of 100-300 AU. We discover a strongly polarized, biconical nebula 10 arcseconds in diameter (6000 AU) around the star LkHa 198, and also observe a polarized jet-like feature associated with the deeply embedded source LkHa 198-IR. The star LkHa 233 presents a narrow, unpolarized dark lane consistent with an optically thick circumstellar disk blocking our direct view of the star. These data show that the lower-mass T Tauri and intermediate mass Herbig Ae/Be stars share a common evolutionary sequence.

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