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  A study of dust properties in the inner sub-au region of the Herbig Ae star HD 169142 with VLTI/PIONIER

Chen, L., Kóspál, Á., Ábrahám, P., Kreplin, A., Matter, A., & Weigelt, G. (2018). A study of dust properties in the inner sub-au region of the Herbig Ae star HD 169142 with VLTI/PIONIER. Astronomy and Astrophysics, 609.

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Chen, L.1, Author
Kóspál, Á.1, Author
Ábrahám, P.1, Author
Kreplin, A.1, Author
Matter, A.1, Author
Weigelt, G.1, Author
Affiliations:
1Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners, ou_2421692              

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Free keywords: accretion accretion disks techniques: interferometric protoplanetary disks circumstellar matter stars: pre-main sequence stars: individual: HD 169142 Astrophysics - Solar and Stellar Astrophysics Astrophysics - Earth and Planetary Astrophysics
 Abstract: Context. An essential step to understanding protoplanetary evolution is the study of disks that contain gaps or inner holes. The pre- transitional disk around the Herbig star HD 169142 exhibits multi-gap disk structure, differentiated gas and dust distribution, planet candidates, and near-infrared fading in the past decades, which make it a valuable target for a case study of disk evolution.
Aims: Using near-infrared interferometric observations with VLTI/PIONIER, we aim to study the dust properties in the inner sub-au region of the disk in the years 2011-2013, when the object is already in its near-infrared faint state.
Methods: We first performed simple geometric modeling to characterize the size and shape of the NIR-emitting region. We then performed Monte-Carlo radiative transfer simulations on grids of models and compared the model predictions with the interferometric and photometric observations.
Results: We find that the observations are consistent with optically thin gray dust lying at Rin 0.07 au, passively heated to T 1500 K. Models with sub-micron optically thin dust are excluded because such dust will be heated to much higher temperatures at similar distance. The observations can also be reproduced with a model consisting of optically thick dust at Rin 0.06 au, but this model is plausible only if refractory dust species enduring 2400 K exist in the inner disk. Based on observations collected at the European Organisation for Astronomical Research in the Southern Hemisphere under ESO programs 190.C-963 and 087.C-0709.

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 Dates: 2018
 Publication Status: Issued
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Title: Astronomy and Astrophysics
Source Genre: Journal
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Pages: - Volume / Issue: 609 Sequence Number: - Start / End Page: - Identifier: -