2018A&A...609A..45C


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.13CEST00:16:33

2018A&A...609A..45C - Astronomy and Astrophysics, volume 609A, 45-45 (2018/1-1)

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

CHEN L., KOSPAL A., ABRAHAM P., KREPLIN A., MATTER A. and WEIGELT G.

Abstract (from CDS):

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∼0.07au, passively heated to T∼1500K. 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∼0.06au, but this model is plausible only if refractory dust species enduring ∼2400K exist in the inner disk.

Abstract Copyright: © ESO, 2018

Journal keyword(s): accretion, accretion disks - techniques: interferometric - protoplanetary disks - circumstellar matter - stars: pre-main sequence - stars: individual: HD 169142

Simbad objects: 6

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Number of rows : 6

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 V* GW Ori Or* 05 29 08.3925564419 +11 52 12.653756566   10.83 10.10 9.52   G5/8Ve 299 0
2 HD 100546 Be* 11 33 25.4404858122 -70 11 41.239343121   6.71 6.30   6.64 A0VaekB8_lB 651 1
3 HD 139614 pr* 15 40 46.3818973118 -42 29 53.538928508   8.47 8.24     A9VekA5mA5(_lB) 160 0
4 HD 144432 Ae* 16 06 57.9530266912 -27 43 09.758016578 8.47 8.53 8.19 7.82 7.53 A9/F0V 211 1
5 HD 163296 Ae* 17 56 21.2882188601 -21 57 21.872343282 7.00 6.93 6.85 6.86 6.67 A1Vep 803 0
6 HD 169142 Ae* 18 24 29.7799676975 -29 46 49.328597698   8.42 8.16     F1VekA3mA3_lB? 335 2

    Equat.    Gal    SGal    Ecl

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2020.07.13-00:16:33

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