Browsing by Author "Zhu, Zhaohuan"

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    Resolving the FU Orionis System with ALMA: Interacting Twin Disks?
    (2020) Perez, Sebastian; Hales, Antonio; Liu, Hauyu Baobab; Zhu, Zhaohuan; Casassus, Simon; Williams, Jonathan; Zurlo, Alice; Cuello, Nicolas; Cieza, Lucas; Principe, David
    FU Orionis objects are low-mass pre-main sequence stars characterized by dramatic outbursts several magnitudes in brightness. These outbursts are linked to episodic accretion events in which stars gain a significant portion of their mass. The physical processes behind these accretion events are not yet well understood. The archetypal FU Ori system, FU Orionis, is composed of two young stars with detected gas and dust emission. The continuum emitting regions have not been resolved until now. Here, we present 1.3 mm observations of the FU Ori binary system using the Atacama Large Millimeter/submillimeter Array. The disks are resolved at 40 mas resolution. Radiative transfer modeling shows that the emission from FU Ori north (primary) is consistent with a dust disk with a characteristic radius of similar to 11 au. The ratio between the major and minor axes shows that the inclination of the disk is similar to 37 degrees. FU Ori south is consistent with a dust disk of similar inclination and size. Assuming the binary orbit shares the same inclination angle as the disks, the deprojected distance between the north and south components is 06, i.e., similar to 250 au. Maps of (CO)-C-12 emission show a complex kinematic environment with signature disk rotation at the location of the northern component, and also (to a lesser extent) for FU Ori south. The revised disk geometry allows us to update FU Ori accretion models, yielding a stellar mass and mass accretion rate of FU Ori north of 0.6 M and 3.8 x 10(-5) M yr(-1), respectively.
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    The Disk Substructures at High Angular Resolution Program (DSHARP). VIII. The Rich Ringed Substructures in the AS 209 Disk
    (2018) Guzman, Viviana V.; Huang, Jane; Andrews, Sean M.; Isella, Andrea; Perez, Laura M.; Carpenter, John M.; Dullemond, Cornelis P.; Ricci, Luca; Birnstiel, Tilman; Zhang, Shangjia; Zhu, Zhaohuan; Bai, Xue-Ning; Benisty, Myriam; Oberg, Karin I.; Wilner, David J.
    We present a detailed analysis of the high angular resolution (0.'' 037, corresponding to 5 au) observations of the 1.25. mm continuum and (CO)-C-12 2 - 1 emission from the disk around the T. Tauri star AS. 209. AS. 209 hosts one of the most unusual disks from the Disk Substructures at High Angular Resolution Project sample, the first high angular resolution Atacama Large Millimeter Array survey of disks, as nearly all of the emission can be explained with concentric Gaussian rings. In particular, the dust emission consists of a series of narrow and closely spaced rings in the inner similar to 60 au, two well-separated bright rings in the outer disk, centered at 74 and 120 au, and at least two fainter emission features at 90 and 130 au. We model the visibilities with a parametric representation of the radial surface brightness profile, consisting of a central core and seven concentric Gaussian rings. Recent hydrodynamical simulations of low-viscosity disks show that super-Earth planets can produce the multiple gaps seen in AS. 209 millimeter continuum emission. The (CO)-C-12 line emission is centrally peaked and extends out to similar to 300 au, much farther than the millimeter dust emission. We find axisymmetric, localized deficits of CO emission around four distinct radii, near 45, 75, 120, and 210 au. The outermost gap is located well beyond the edge of the millimeter dust emission, and therefore cannot be due to dust opacity and must be caused by a genuine CO surface density reduction, due either to chemical effects or depletion of the overall gas content.
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    The Disk Substructures at High Angular Resolution Project (DSHARP). I. Motivation, Sample, Calibration, and Overview
    (2018) Andrews, Sean M.; Huang, Jane; Perez, Laura M.; Isella, Andrea; Dullemond, Cornelis P.; Kurtovic, Nicolás T.; Guzmán Veloso, Viviana Gabriela; Carpenter, John M.; Wilner, David J.; Zhang, Shangjia; Zhu, Zhaohuan; Birnstiel, Tilman; Bai, Xue-Ning; Benisty, Myriam; Hughes, A. Meredith; Öberg, Karin I.; Ricci, Luca
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    The Disk Substructures at High Angular Resolution Project (DSHARP). II. Characteristics of Annular Substructures
    (2018) Huang, Jane; Andrews, Sean M.; Dullemond, Cornelis P.; Isella, Andrea; Perez, Laura M.; Guzmán Veloso, Viviana Gabriela; Öberg, Karin I.; Zhu, Zhaohuan; Zhang, Shangjia; Bai, Xue-Ning; Benisty, Myriam; Birnstiel, Tilman; Carpenter, John M.; Hughes, A. Meredith; Ricci, Luca; Weaver, Erik; Wilner, David J.
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    The Disk Substructures at High Angular Resolution Project (DSHARP). III. Spiral Structures in the Millimeter Continuum of the Elias 27, IM Lup, and WaOph 6 Disks
    (2018) Huang, Jane; Andrews, Sean M.; Perez, Laura M.; Zhu, Zhaohuan; Dullemond, Cornelis P.; Isella, Andrea; Benisty, Myriam; Bai, Xue-Ning; Birnstiel, Tilman; Guzmán Veloso, Viviana Gabriela; Carpenter, John M.; Hughes, A. Meredith; Öberg, Karin I.; Ricci, Luca; Wilner, David J.; Zhang, Shangjia
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    The Disk Substructures at High Angular Resolution Project (DSHARP). IV. Characterizing Substructures and Interactions in Disks around Multiple Star Systems
    (2018) Kurtovic, Nicolas T.; Perez, Laura M.; Benisty, Myriam; Zhu, Zhaohuan; Zhang, Shangjia; Huang, Jane; Andrews, Sean M.; Dullemond, Cornelis P.; Isella, Andrea; Guzmán Veloso, Viviana Gabriela; Bai, Xue-Ning; Carpenter, John M.; Ricci, Luca; Wilner, David J.
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    The Disk Substructures at High Angular Resolution Project (DSHARP). IX. A High-definition Study of the HD 163296 Planet-forming Disk
    (2018) Isella, Andrea; Huang, Jane; Andrews, Sean M.; Dullemond, Cornelis P.; Birnstiel, Tilman; Zhang, Shangjia; Zhu, Zhaohuan; Guzmán Veloso, Viviana Gabriela; Pérez, Laura M.; Bai, Xue-Ning; Benisty, Myriam; Carpenter, John M.; Ricci, Luca; Wilner, David J.
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    The Disk Substructures at High Angular Resolution Project (DSHARP). VI. Dust Trapping in Thin-ringed Protoplanetary Disks
    (2018) Dullemond, Cornelis P.; Birnstiel, Tilman; Huang, Jane; Kurtovic, Nicolas T.; Andrews, Sean M.; Guzmán Veloso, Viviana Gabriela; Pérez, Laura M.; Isella, Andrea; Zhu, Zhaohuan; Benisty, Myriam; Wilner, David J.; Bai, Xue-Ning; Carpenter, John M.; Zhang, Shangjia; Ricci, Luca
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    The Disk Substructures at High Angular Resolution Project (DSHARP). VII. The Planet-Disk Interactions Interpretation
    (2018) Zhang, Shangjia; Zhu, Zhaohuan; Huang, Jane; Guzmán Veloso, Viviana Gabriela; Andrews, Sean M.; Birnstiel, Tilman; Dullemond, Cornelis P.; Carpenter, John M.; Isella, Andrea; Pérez, Laura M.; Benisty, Myriam; Wilner, David J.; Baruteau, Clément; Bai, Xue-Ning; Ricci, Luca
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    The Disk Substructures at High Angular Resolution Project (DSHARP). X. Multiple Rings, a Misaligned Inner Disk, and a Bright Arc in the Disk around the T Tauri star HD 143006
    (2018) Perez, Laura M.; Benisty, Myriam; Andrews, Sean M.; Isella, Andrea; Dullemond, Cornelis P.; Huang, Jane; Kurtovic, Nicolás T.; Guzmán Veloso, Viviana Gabriela; Zhu, Zhaohuan; Birnstiel, Tilman; Zhang, Shangjia; Carpenter, John M.; Wilner, David J.; Ricci, Luca; Bai, Xue-Ning; Weaver, Erik; Öberg, Karin I.