Gas and dust in the inner disk of the Herbig Ae star MWC 758
Isella, A. ; Tatulli, E. ; Natta, A. ; et al. ; - ASI Sponsor
May - 2008
DOI: 10.1051/0004-6361:200809641
ISSN : 0004-6361 ;
journal : Astronomy and Astrophysics

Issue : 2
type: Article Journal

Abstract
We investigate the origin of the near-infrared emission of the Herbig Ae star MWC 758 on sub-astronomical unit (AU) scales using spectrally dispersed low resolution (R = 35) AMBER/VLTI interferometric observations in the H (1.7 \mum) and K (2.2 \mum) bands. We find that the K band visibilities and closure phases are consistent with the presence of a dusty disk inner rim located at the dust evaporation distance (0.4 AU) while the bulk of the H band emission arises within 0.1 AU from the central star. Comparing the observational results with theoretical model predictions, we suggest that the H band emission is dominated by an hot gaseous accretion disk. Based on observations collected at the European Southern Observatory, Chile, Program 078.C-0243.

keywords : accretion,accretion disks,stars: planetary systems: protoplanetary disks,techniques: interferometric