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  1. OA@INAF
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  3. 1 CONTRIBUTI IN RIVISTE (Journal articles)
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Please use this identifier to cite or link to this item: http://hdl.handle.net/20.500.12386/28895
Title: Dust-to-gas Ratio Resurgence in Circumstellar Disks Due to the Formation of Giant Planets: The Case of HD 163296
Authors: TURRINI, Diego 
Marzari, F.
Polychroni, D.
TESTI, Leonardo 
Issue Date: 2019
Journal: THE ASTROPHYSICAL JOURNAL 
Number: 877
Issue: 1
Abstract: The amount of dust present in circumstellar disks is expected to steadily decrease with age due to the growth from μm-sized particles to planetesimals and planets. Mature circumstellar disks, however, can be observed to contain significant amounts of dust and possess high dust-to-gas ratios. Using HD 163296 as our case study, we explore how the formation of giant planets in disks can create the conditions for collisionally rejuvenating the dust population, halting or reversing the expected trend. We combine N-body simulations with statistical methods and impact scaling laws to estimate the dynamical and collisional excitation of the planetesimals due to the formation of HD 163296's giant planets. We show that this process creates a violent collisional environment across the disk that can inject collisionally produced second-generation dust into it, significantly contributing to the observed dust-to-gas ratio. The spatial distribution of the dust production can explain the observed local enrichments in HD 163296's inner regions. The results obtained for HD 163296 can be extended to any disk with embedded forming giant planets and may indicate a common evolutionary stage in the life of such circumstellar disks. Furthermore, the dynamical excitation of the planetesimals could result in the release of transient, nonequilibrium gas species like H2O, CO2, NH3, and CO in the disk due to ice sublimation during impacts and, due to the excited planetesimals being supersonic with respect to the gas, could produce bow shocks in the latter that could heat it and cause a broadening of its emission lines.
URI: http://hdl.handle.net/20.500.12386/28895
URL: https://iopscience.iop.org/article/10.3847/1538-4357/ab18f5
https://arxiv.org/abs/1802.04361
ISSN: 0004-637X
DOI: 10.3847/1538-4357/ab18f5
Bibcode ADS: 2019ApJ...877...50T
Fulltext: open
Appears in Collections:1.01 Articoli in rivista

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