Study of the sub-AU disk of the Herbig B[e] star HD 85567 with near-infrared interferometry

Abstract

Context: The structure of the inner disk of Herbig Be stars is not well understood. The continuum disks of several Herbig Be stars have inner radii that are smaller than predicted by models of irradiated disks with optically thin holes. Aims: We study the size of the inner disk of the Herbig B[e] star HD 85567 and compare the model radii with the radius suggested by the size-luminosity relation. Methods: The object was observed with the AMBER instrument of the Very Large Telescope Interferometer. We obtained K-band visibilities and closure phases. These measurements are interpreted with geometric models and temperature-gradient models. Results: Using several types of geometric star-disk and star-disk-halo models, we derived inner ring-fit radii in the K band that are in the range of 0.8 - 1.6 AU. Additional temperature-gradient modeling resulted in an extended disk with an inner radius of $0.67_{-0.21}^{+0.51}$ AU, a high inner temperature of $2200_{-350}^{+750}$ K, and a disk inclination of $53_{-11}^{+15}$${}^{\circ }$. Conclusions: The derived geometric ring-fit radii are approximately 3 - 5 times smaller than that predicted by the size-luminosity relation. The small geometric and temperature-gradient radii suggest optically thick gaseous material that absorbs stellar radiation inside the dust disk.

References in corpus (23)

• Passive irradiated circumstellar disks with an inner hole
• The inner regions of protoplanetary disks
• Interferometric data reduction with AMBER/VLTI.Principle,estimators and illustration
• On the Interferometric Sizes of Young Stellar Objects
• Spatially Resolved Circumstellar Structure of Herbig Ae/Be Stars in the Near-Infrared
• Resolved Inner Disks around Herbig Ae/Be Stars
• The near-infrared size-luminosity relations for Herbig Ae/Be disks
• The origin of hydrogen line emission for five Herbig Ae/Be stars spatially resolved by VLTI/AMBER spectro-interferometry
• A hot compact dust disk around a massive young stellar object
• On the binarity of Herbig Ae/Be stars
• Catalogue of Apparent Diameters and Absolute Radii of Stars (CADARS) - Third Edition - Comments and Statistics
• Strong near-infrared emission in the sub-AU disk of the Herbig Ae star HD163296: evidence for refractory dust?
• Near-Infrared Interferometric Measurements of Herbig Ae/Be Stars
• Detection of an inner gaseous component in a Herbig Be star accretion disk: Near- and mid-infrared spectro-interferometry and radiative transfer modeling of MWC 147
• The inner radius of T Tauri disks estimated from near-infrared interferometry: the importance of scattered light
• New insights on the AU-scale circumstellar structure of FU Orionis
• VLTI/AMBER spectro-interferometry of the Herbig Be star MWC 297 with spectral resolution 12 000
• On the nature of the Herbig B[e] star binary system V921 Scorpii: Geometry and kinematics of the circumprimary disk on sub-AU scales
• AMBER/VLTI observations of the B[e] star MWC 300
• Near-infrared interferometric observation of the Herbig Ae star HD144432 with VLTI/AMBER
• HD 85567: A Herbig B[e] star or an interacting B[e] binary
• Revealing the inner circumstellar disk of the T Tauri star S CrA N using the VLTI
• The inner circumstellar disk of the UX Ori star V1026 Sco

Cited by in corpus (5)

• Polycyclic Aromatic Hydrocarbon in Protoplanetary Disks around Herbig Ae/Be and T Tauri Stars
• A disk asymmetry in motion around the B[e] star MWC158
• A multi-wavelength interferometric study of the massive young stellar object IRAS 13481-6124
• Towards Understanding The B[e] Phenomenon: VI. Nature and Spectral Variations of HD 85567
• BCD spectrophotometry for massive stars in transition phases