FU Orionis - The MIDI/VLTI Perspective

Abstract

We present the first mid-infrared interferometric measurements of FU Orionis. We clearly resolve structures that are best explained with an optically thick accretion disk. A simple accretion disk model fits the observed SED and visibilities reasonably well and does not require the presence of any additional structure such as a dusty envelope. The inclination and also the position angle of the disk can be constrained from the multibaseline interferometric observations. Our disk model is in general agreement with most published near-infrared interferometric measurements. From the shape and strength of the 8-13 micrometer spectrum the dust composition of the accretion disk is derived for the first time. We conclude that most dust particles are amorphous and already much larger than those typically observed in the ISM. Although the high accretion rate of the system provides both, high temperatures out to large radii and an effective transport mechanism to distribute crystalline grains, we do not see any evidence for crystalline silicates neither in the total spectrum nor in the correlated flux spectra from the inner disk regions. Possible reasons for this non-detection are mentioned. All results are discussed in context with other high-spatial resolution observations of FU Ori and other FU Ori objects. We also address the question whether FU Ori is in a younger evolutionary stage than a classical TTauri star.

41 pages (aastex style), 11 figures, 8 tables, accepted by ApJ

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Cited by in corpus (29)

• The formation and evolution of planetary systems: Grain growth and chemical processing of dust in T Tauri systems
• The Hot Inner Disk of FU Ori
• The structure of the protoplanetary disk surrounding three young intermediate mass stars. II. Spatially resolved dust and gas distribution
• Mid-infrared size survey of Young Stellar Objects: Description of Keck segment-tilting experiment and basic results
• Evolution of dust and ice features around FU Orionis objects
• Relation between the luminosity of young stellar objects and their circumstellar environment
• Long-wavelength excesses of FU Orionis objects: flared outer disks or infalling envelopes?
• Dust Transport and Processing in Centrifugally Driven Protoplanetary Disk Winds
• VLTI/MIDI atlas of disks around low- and intermediate-mass young stellar objects
• The Rapid Outbursting Star GM Cep: An EX-or in Tr 37?
• Irregular dust features around intermediate-mass young stars with GPI: signs of youth or misaligned disks?
• Formation and evolution of planetary systems: the impact of high angular resolution optical techniques
• Multi-wavelength observations of the young binary system Haro 6-10: The case of misaligned discs
• Diagnosing 0.1-10 au scale morphology of the FU\,Ori disk using ALMA and VLTI/GRAVITY
• Temporal variations of the outer atmosphere and the dust shell of the carbon-rich Mira variable V Oph probed with VLTI/MIDI
• Resolving the Sub-AU-Scale Gas and Dust Distribution in FU Orionis Sources
• Dynamics during outburst: VLTI observations of the young eruptive star V1647 Ori during its 2003-2006 outburst
• X-ray Emission from the FU Orionis Star V1735 Cygni
• Viscous Heating and Boundary Layer Accretion in the Disk of Outbursting Star FU Orionis
• High-resolution polarimetry of Parsamian 21: revealing the structure of an edge-on FU Ori disc
• Disc wind models for FU Ori objects
• The disk of FU Orionis viewed with MATISSE/VLTI: first interferometric observations in $L$ and $M$ bands
• Chandra Reveals Variable Multi-Component X-ray Emission from FU Orionis
• Mid-IR observations of circumstellar disks -- Part III: A mixed sample of PMS stars and Vega-type objects
• Astrophysics in 2006
• FU Orionis disk outburst: evidence for a gravitational instability scenario triggered in a magnetically dead zone
• 10 $\mu$m interferometry of disks around young stars
• Inner disk regions revealed by infrared interferometry
• Interferometric science results on young stellar objects