Polarimetric and radiative transfer modelling of HD 172555
Article
Article Title | Polarimetric and radiative transfer modelling of HD 172555 |
---|---|
ERA Journal ID | 1074 |
Article Category | Article |
Authors | Marshall, Jonathan P. (Author), Cotton, Daniel V. (Author), Scicluna, Peter (Author), Bailey, Jeremy (Author), Kedziora-Chudczer, Lucyna (Author) and Bott, Kimberly (Author) |
Journal Title | Monthly Notices of the Royal Astronomical Society |
Journal Citation | 499 (4), pp. 5915-5931 |
Number of Pages | 17 |
Year | 2020 |
Publisher | Oxford University Press |
Place of Publication | United Kingdom |
ISSN | 0035-8711 |
1365-2966 | |
Digital Object Identifier (DOI) | https://doi.org/10.1093/mnras/staa3195 |
Web Address (URL) | https://academic.oup.com/mnras/article/499/4/5915/5925356 |
Abstract | The debris disc around HD 172555 was recently imaged in near-infrared polarized scattered light by the Very Large Telescope’s Spectro-Polarimetric High-contrast Exoplanet REsearch instrument. Here we present optical aperture polarization measurements of HD 172555 by the HIgh Precision Polarimetric Instrument (HIPPI), and its successor HIPPI-2 on the Anglo-Australian Telescope. We seek to refine constraints on the disc’s constituent dust grains by combining our polarimetric measurements with available infrared and millimetre photometry to model the scattered light and continuum emission from the disc. We model the disc using the 3D radiative transfer code HYPERION, assuming the orientation and extent of the disc as obtained from the SPHERE observation. After correction for the interstellar medium contribution, our multiwavelength HIPPI/-2 observations (both magnitude and orientation) are consistent with the recent SPHERE polarization measurement with a fractional polarization p = 62.4 ± 5.2 ppm at 722.3 nm, and a position angle θ = 67° ± 3°. The multiwavelength polarization can be adequately replicated by compact, spherical dust grains (i.e. from Mie theory) that are around 1.2 μm in size, assuming astronomical silicate composition, or 3.9 μm, assuming a composition derived from radiative transfer modelling of the disc. We were thus able to reproduce both the spatially resolved disc emission and polarization with a single grain composition model and size distribution. |
Keywords | circumstellar matter, polarization, radiative transfer, stars: individual: HD 172555 |
ANZSRC Field of Research 2020 | 510109. Stellar astronomy and planetary systems |
Public Notes | This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2020 The Authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved. |
Byline Affiliations | Centre for Astrophysics |
Academia Sinica, Taiwan | |
University of New South Wales | |
University of California, United States | |
Institution of Origin | University of Southern Queensland |
https://research.usq.edu.au/item/q76y8/polarimetric-and-radiative-transfer-modelling-of-hd-172555
Download files
81
total views46
total downloads4
views this month2
downloads this month