Diagnosing 0.1─10 au Scale Morphology of the FU Ori Disk Using ALMA and VLTI/GRAVITY

Liu, Hauyu Baobab and Mérand, Antoine and Green, Joel D. and Pérez, Sebastián and Hales, Antonio S. and Kóspál, Ágnes (2019) Diagnosing 0.1─10 au Scale Morphology of the FU Ori Disk Using ALMA and VLTI/GRAVITY. ASTROPHYSICAL JOURNAL, 884 (1). ISSN 1538-4357

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Abstract

We report new Atacama Large Millimeter/submillimeter Array Band 3 (86─100 GHz; ∼80 mas angular resolution) and Band 4 (146─160 GHz; ∼5 mas angular resolution) observations of the dust continuum emissio toward the archetypal and ongoing accretion burst young stellar objec FU Ori, which simultaneously covered its companion, FU Ori S. I addition, we present near-infrared (2─2.45 μm) observations of FU Or taken with the General Relativity Analysis via VLT InTerferometr (GRAVITY; ∼1 mas angular resolution) instrument on the Very Larg Telescope Interferometer (VLTI). We find that the emission in both F Ori and FU Ori S at (sub)millimeter and near-infrared bands is dominate by structures inward of ∼10 au radii. We detected closure phases clos to zero from FU Ori with VLTI/GRAVITY, which indicate the source i approximately centrally symmetric and therefore is likely viewed nearl face-on. Our simple model to fit the GRAVITY data shows that the inne 0.4 au radii of the FU Ori disk has a triangular spectral shape a 2─2.45 μm, which is consistent with the H2O and CO absorptio features in a \\dot{M} ∼ 10−4 M ☉ yr−1 viscously heated accretion disk. At larger (∼0.4─10 au) radii, ou analysis shows that viscous heating may also explain the observe (sub)millimeter and centimeter spectral energy distribution when w assume a constant, ∼10−4 M ☉ yr−1 mas inflow rate in this region. This explains how the inner 0.4 au disk i replenished with mass at a modest rate, such that it neither deplete nor accumulates significant masses over its short dynamic timescale Finally, we tentatively detect evidence of vertical dust settling in th inner 10 au of the FU Ori disk, but confirmation requires more complet spectral sampling in the centimeter bands

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