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    Scattering and sublimation: A multiscale view of μm-sized dust in the inclined disc of HD 145718

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    Author
    Davies, C.L.
    Rich, E.A.
    Harries, T.J.
    Monnier, J.D.
    Laws, A.S.E.
    Andrews, S.M.
    Bae, J.
    Wilner, D.J.
    Anugu, N.
    Ennis, J.
    Gardner, T.
    Kraus, S.
    Labdon, A.
    Le Bouquin, J.-B.
    Lanthermann, C.
    Schaefer, G.H.
    Setterholm, B.R.
    Ten Brummelaar, T.
    Show allShow less
    Affiliation
    Steward Observatory, Department of Astronomy, University of Arizona
    Issue Date
    2022
    Keywords
    Accretion
    Accretion discs
    Circumstellar matter
    Radiative transfer
    Stars: formation
    Stars: individual: HD 145718
    Techniques: high angular resolution
    
    Metadata
    Show full item record
    Publisher
    Oxford University Press
    Citation
    Davies, C. L., Rich, E. A., Harries, T. J., Monnier, J. D., Laws, A. S. E., Andrews, S. M., Bae, J., Wilner, D. J., Anugu, N., Ennis, J., Gardner, T., Kraus, S., Labdon, A., Le Bouquin, J.-B., Lanthermann, C., Schaefer, G. H., Setterholm, B. R., & Ten Brummelaar, T. (2022). Scattering and sublimation: A multiscale view of μm-sized dust in the inclined disc of HD 145718. Monthly Notices of the Royal Astronomical Society.
    Journal
    Monthly Notices of the Royal Astronomical Society
    Rights
    Copyright © 2022 The Author(s). Published by Oxford University Press on behalf of Royal Astronomical Society.
    Collection Information
    This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.
    Abstract
    We present multi-instrument observations of the disc around the Herbig Ae star, HD 145718, employing geometric and Monte Carlo radiative transfer models to explore the disc orientation, the vertical and radial extent of the near-infrared (NIR) scattering surface, and the properties of the dust in the disc surface and sublimation rim. The disc appears inclined at 67-71°, with position angle, PA =-1.0 to 0.6°, consistent with previous estimates. The NIR scattering surface extends out to ∼ 75 au and we infer an aspect ratio, hscat(r)/r ∼0.24 in J band; ∼0.22 in H band. Our Gemini Planet Imager images and VLTI + CHARA NIR interferometry suggest that the disc surface layers are populated by grains λ/2πin size, indicating these grains are aerodynamically supported against settling and/or the density of smaller grains is relatively low. We demonstrate that our geometric analysis provides a reasonable assessment of the height of the NIR scattering surface at the outer edge of the disc and, if the inclination can be independently constrained, has the potential to probe the flaring exponent of the scattering surface in similarly inclined (i 70°) discs. In re-evaluating HD 145718's stellar properties, we found that the object's dimming events-previously characterized as UX Or and dipper variability-are consistent with dust occultation by grains larger, on average, than found in the ISM. This occulting dust likely originates close to the inferred dust sublimation radius at 0.17 au. © 2022 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society.
    Note
    Immediate access
    ISSN
    0035-8711
    DOI
    10.1093/mnras/stac149
    Version
    Final published version
    ae974a485f413a2113503eed53cd6c53
    10.1093/mnras/stac149
    Scopus Count
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    UA Faculty Publications

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