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| Naji, M. |
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| Motta, Antonella |
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| Aletan, Dirar |
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| Mohamed, Tarek |
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| Ertürk, Emre |
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| Taccardi, Nicola |
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| Kononenko, Denys |
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| Petrov, R. H. | Madrid |
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| Alshaaer, Mazen | Brussels |
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| Bih, L. |
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| Casati, R. |
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| Muller, Hermance |
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| Kočí, Jan | Prague |
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| Šuljagić, Marija |
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| Kalteremidou, Kalliopi-Artemi | Brussels |
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| Azam, Siraj |
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| Ospanova, Alyiya |
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| Blanpain, Bart |
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| Ali, M. A. |
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| Popa, V. |
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| Rančić, M. |
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| Ollier, Nadège |
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| Azevedo, Nuno Monteiro |
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| Landes, Michael |
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| Rignanese, Gian-Marco |
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Dominik, Carsten
University of Amsterdam
in Cooperation with on an Cooperation-Score of 37%
Topics
Publications (9/9 displayed)
- 2024The polarisation properties of the HD 181327 debris ring. Evidence for sub-micron particles from scattered light observationscitations
- 2023The polarisation properties of the HD 181327 debris ring. Evidence for sub-micron particles from scattered light observations
- 2023Fractal Aggregates of Submicron-sized Grains in the Young Planet-forming Disk around IM Lupcitations
- 2022Locating dust and molecules in the inner circumstellar environment of R Sculptoris with MATISSEcitations
- 2014Rolling friction of adhesive microspherescitations
- 2014Dusty tails of evaporating exoplanets. I. Constraints on the dust compositioncitations
- 2010Dust Evolution in Protoplanetary Disks Around Herbig Ae/Be Stars—the Spitzer Viewcitations
- 2009The inner rim structures of protoplanetary discscitations
- 2006Water ice growth around evolved stars. II. Modeling infrared spectracitations
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article
Fractal Aggregates of Submicron-sized Grains in the Young Planet-forming Disk around IM Lup
Abstract
Despite rapidly growing disk observations, it remains a mystery what primordial dust aggregates look like and what the physical and chemical properties of their constituent grains (monomers) are in young planet-forming disks. Confrontation of models with observations to answer this mystery has been a notorious task because we have to abandon a commonly used assumption, perfectly spherical grains, and take into account particles with complex morphology. In this Letter, we present the first thorough comparison between near-infrared scattered light of the young planet-forming disk around IM Lup and the light-scattering properties of complex-shaped dust particles. The availability of scattering observations at multiple wavelengths and over a significant range of scattering angles allows for the first determination of the monomer size, fractal dimension, and size of dust aggregates in a planet-forming disk. We show that the observations are best explained by fractal aggregates with a fractal dimension of 1.5 and a characteristic radius larger than ∼2 μ m. We also determined the radius of the monomer to be ∼200 nm, and monomers much smaller than this size can be ruled out on the premise that the fractal dimension is less than 2. Furthermore, dust composition comprising amorphous carbon is found to be favorable to simultaneously account for the faint scattered light and the flared disk morphology. Our results support that planet formation begins with fractal coagulation of submicron-sized grains. All the optical properties of complex dust particles computed in this study are publicly available.