Subaru near-infrared imaging of herbig ae stars

Misato Fukagawa, Motohide Tamura, Yoichi Itoh, Yumiko Oasa, Tomoyuki Kudo, Saeko S. Hayashi, Eri Kato, Takafumi Ootsubo, Yusuke Itoh, Hiroshi Shibai, Masahiko Hayashi

Research output: Contribution to journalArticlepeer-review

35 Citations (Scopus)

Abstract

We report results of H-band (λ = 1.65 μm) imaging observations of young intermediate-mass stars using the Subaru 8.2-m Telescope with the adaptive optics AO36 and the infrared coronagraph CIAO. The targets consist of 16 Herbig Ae/Be stars (15 Herbig Ae stars and one Herbig Be star) and four additional main-sequence stars with infrared excesses. Five protoplanetary disks have been spatially resolved around the Herbig Ae stars with ages of 2-8 Myr. The resolved disks have outer radii of several 100 AU, and their surface brightnesses range from 10 mag arcsec-2 to 18 mag arcsec -2. The images reveal various morphologies in optically thick disks: spiral arms around AB Aur, a banana-split structure with an outer arm for HD 142527, a compact circumprimary disk of HD 150193, a faint discontinuous ring around HD 163296, and an unstructured face-on disk of HD 169142. The detection of an optically thick disk in scattered light implies that it is vertically flared, and intercepts stellar light at least in the outer region where those images were obtained. However, the surface brightness distribution, the resolved structure, and other observational characteristics suggest that the disks are unlikely to be continuously flared young disks with small grains well mixed with gas. The detection rate and the disk brightness do not correlate with the stellar age and the disk mass, but there is a tendency that the brightest disks are still surrounded by long-lived envelopes (AB Aur, HD 100546, HD 142527). The significant diversity of the disk structure can be attributed to the multiplicity and the initial condition of the local star-forming environments. The detections of companion candidates around our targeted stars are also reported.

Original languageEnglish
Pages (from-to)347-370
Number of pages24
JournalPublications of the Astronomical Society of Japan
Volume62
Issue number2
DOIs
Publication statusPublished - 2010 Apr 25

Keywords

  • Planetary systems: protoplanetary disk
  • Stars: individual (HD 163296, HD 169142)
  • Stars: pre-main sequence

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

Fingerprint Dive into the research topics of 'Subaru near-infrared imaging of herbig ae stars'. Together they form a unique fingerprint.

Cite this