| DOI | Trouver le DOI : https://doi.org/10.1093/mnras/stab1901 |
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| Auteur | Rechercher : Norfolk, Brodie J.; Rechercher : Maddison, Sarah T.; Rechercher : Marshall, Jonathan P.; Rechercher : Kennedy, Grant M.Identifiant ORCID : https://orcid.org/0000-0001-6831-7547; Rechercher : Duchêne, Gaspard; Rechercher : Wilner, David J.; Rechercher : Pinte, ChristopheIdentifiant ORCID : https://orcid.org/0000-0001-5907-5179; Rechercher : Moór, Attila; Rechercher : Matthews, Brenda1; Rechercher : Ábrahám, Péter; Rechercher : Kóspál, Ágnes; Rechercher : Van der Marel, Nienke1 |
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| Affiliation | - Conseil national de recherches Canada. Herzberg en astronomie et en astrophysique
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| Bailleur de fonds | Rechercher : Royal Society; Rechercher : Ministry of Science and Technology of Taiwan; Rechercher : Academia Sinica; Rechercher : NKFIH; Rechercher : CSIRO; Rechercher : NASA; Rechercher : National Science Foundation |
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| Format | Texte, Article |
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| Sujet | techniques: interferometric; planets and satellites: dynamical evolution and stability; circumstellar matter; planetary systems |
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| Résumé | Millimetre continuum observations of debris discs can provide insights into the physical and dynamical properties of the unseen planetesimals that these discs host. The material properties and collisional models of planetesimals leave their signature on the grain size distribution, which can be traced through the millimetre spectral index. We present 8.8 mm observations of the debris discs HD 48370, CPD-72 2713, HD 131488, and HD 32297 using the Australian Telescope Compact Array (ATCA) as part of the PLanetesimals Around TYpical Pre-main-seqUence Stars (PLATYPUS) survey. We detect all four targets with a characteristic beam size of 5 arcsec and derive a grain size distribution parameter that is consistent with collisional cascade models and theoretical predictions for parent planetesimal bodies where binding is dominated by self-gravity. We combine our sample with 19 other millimetre-wavelength-detected debris discs from the literature and calculate a weighted mean grain size power-law index that is close to analytical predictions for a classical steady-state collisional cascade model. We suggest the possibility of two distributions of q in our debris disc sample; a broad distribution (where q ∼ 3.2–3.7) for ‘typical’ debris discs (gas-poor/non-detection), and a narrow distribution (where q < 3.2) for bright gas-rich discs. Or alternatively, we suggest that there exists an observational bias between the grain size distribution parameter and absolute flux that may be attributed to the detection rates of faint debris discs at ∼ cm wavelengths. |
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| Date de publication | 2021-07-06 |
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| Maison d’édition | Oxford Academic
Royal Astronomical Society |
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| Dans | |
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| Langue | anglais |
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| Publications évaluées par des pairs | Oui |
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| Exporter la notice | Exporter en format RIS |
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| Signaler une correction | Signaler une correction (s'ouvre dans un nouvel onglet) |
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| Identificateur de l’enregistrement | 87ca0b13-376e-4df2-ba80-c98cb5bbdf7d |
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| Enregistrement créé | 2023-01-17 |
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| Enregistrement modifié | 2023-01-17 |
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