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The halo around HD 32297 : μm-sized cometary dust
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Olofsson, Johan, Thébault, P., Kennedy, Grant M. and Bayo, A. (2022) The halo around HD 32297 : μm-sized cometary dust. Astronomy & Astrophysics, 664 . A122. doi:10.1051/0004-6361/202243794 ISSN 0004-6361.
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WRAP-halo-around-HD-32297-um-sized-cometary-dust-2022.pdf - Published Version - Requires a PDF viewer. Available under License Creative Commons Attribution 4.0. Download (781Kb) | Preview |
Official URL: https://doi.org/10.1051/0004-6361/202243794
Abstract
The optical properties of the second generation dust that we observe in debris disks remain quite elusive, whether it is the absorption efficiencies at millimeter wavelengths or the (un)polarized phase function at near-infrared wavelengths. Thankfully the same particles are experiencing forces that are size dependent (e.g., radiation pressure), and with high angular resolution observations we can take advantage of this natural spatial segregation. Observations at different wavelengths probe different ranges of sizes, and there is therefore a great synergy in multi-wavelength observations to better constrain the optical properties of the particles. We present a new approach to simultaneously model SPHERE and ALMA observations and apply it to the debris disk around HD\,32297, putting the emphasis on the spatial distribution of the grains with different β values. This modeling approach requires few assumptions on the actual sizes of the particles and the interpretation can therefore be done a posteriori. We find that the ALMA observations are best reproduced with a combination of small and large β values ( 0.03 and 0.42 ) while the SPHERE observations require several intervals of β values. We discuss the nature of the halo previously reported in ALMA observations, and hypothesize it could be caused by over-abundant μ m-sized particles (the over-abundance being the consequence of their extended lifetime). We model the polarized phase function at near-infrared wavelengths and fluffy aggregates larger than a few μ m provide the best solution. Comparing our results with comets of the solar system, we postulate that the particles released in the disk originate from rather pristine cometary bodies (to avoid compaction of the fluffy aggregates) and are then set on highly eccentric orbits, which could explain the halo detected at long wavelengths.
| Item Type: | Journal Article | |||||||||||||||
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| Subjects: | Q Science > QB Astronomy | |||||||||||||||
| Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | |||||||||||||||
| Library of Congress Subject Headings (LCSH): | Stars, Circumstellar matter, Polarimetry, Cosmic dust, Comets | |||||||||||||||
| Journal or Publication Title: | Astronomy & Astrophysics | |||||||||||||||
| Publisher: | EDP Sciences | |||||||||||||||
| ISSN: | 0004-6361 | |||||||||||||||
| Official Date: | 18 August 2022 | |||||||||||||||
| Dates: |
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| Volume: | 664 | |||||||||||||||
| Number of Pages: | 12 | |||||||||||||||
| Article Number: | A122 | |||||||||||||||
| DOI: | 10.1051/0004-6361/202243794 | |||||||||||||||
| Status: | Peer Reviewed | |||||||||||||||
| Publication Status: | Published | |||||||||||||||
| Access rights to Published version: | Open Access (Creative Commons) | |||||||||||||||
| Copyright Holders: | ©ESO 2022 | |||||||||||||||
| Date of first compliant deposit: | 13 July 2022 | |||||||||||||||
| Date of first compliant Open Access: | 13 July 2022 | |||||||||||||||
| RIOXX Funder/Project Grant: |
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