The debris disc of HD 131488: bringing together thermal emission and scattered light
In: ISSN: 0035-8711, 2024
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academicJournal
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International audience ; ABSTRACT We show the first SPHERE/IRDIS and IFS data of the CO-rich debris disc around HD 131488. We use N-body simulations to model both the scattered light images and the spectral energy distribution of the disc in a self-consistent way. We apply the Henyey–Greenstein approximation, Mie theory, and the Discrete Dipole Approximation to model the emission of individual dust grains. Our study shows that only when gas drag is taken into account can we find a model that is consistent with scattered light as well as thermal emission data of the disc. The models suggest a gas surface density of 2 × 10−5 M⊕ au−2 which is in agreement with estimates from ALMA observations. Thus, our modelling procedure allows us to roughly constrain the expected amount of gas in a debris disc without actual gas measurements. We also show that the shallow size distribution of the dust leads to a significant contribution of large particles to the overall amount of scattered light. The scattering phase function indicates a dust porosity of ∼0.2…0.6 which is in agreement with a pebble pile scenario for planetesimal growth.
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The debris disc of HD 131488: bringing together thermal emission and scattered light
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| Autor/in / Beteiligte Person: | Pawellek, Nicole ; Moór, Attila ; Kirchschlager, Florian ; Milli, Julien ; Kóspál, Ágnes ; Ábrahám, Péter ; Marino, Sebastian ; Wyatt, Mark ; Rebollido, Isabel ; Hughes, a Meredith ; Cantalloube, Faustine ; Henning, Thomas ; University of Cambridge UK (CAM) ; Observatory, Konkoly ; Research Centre for Astronomy and Earth Sciences Budapest ; Hungarian Academy of Sciences (MTA)-Hungarian Academy of Sciences (MTA) ; Institut de Planétologie et d'Astrophysique de Grenoble (IPAG) ; Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS)-Observatoire des Sciences de l'Univers de Grenoble (OSUG ) ; Institut national des sciences de l'Univers (INSU - CNRS)-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Université Grenoble Alpes (UGA)-Météo-France-Institut national des sciences de l'Univers (INSU - CNRS)-Université Savoie Mont Blanc (USMB Université de Savoie Université de Chambéry )-Centre National de la Recherche Scientifique (CNRS)-Institut National de Recherche pour l’Agriculture, l’Alimentation et l’Environnement (INRAE)-Université Grenoble Alpes (UGA)-Météo-France ; Research and Scientific Support Department, ESTEC (RSSD) ; European Space Research and Technology Centre (ESTEC) ; Agence Spatiale Européenne = European Space Agency (ESA)-Agence Spatiale Européenne = European Space Agency (ESA) ; Institute of Astronomy Cambridge ; Space Telescope Science Institute (STSci) ; Laboratoire d'Astrophysique de Marseille (LAM) ; Aix Marseille Université (AMU)-Institut national des sciences de l'Univers (INSU - CNRS)-Centre National d'Études Spatiales Toulouse (CNES)-Centre National de la Recherche Scientifique (CNRS) ; Max Planck Institute for Astronomy (MPIA) |
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| Zeitschrift: | ISSN: 0035-8711, 2024 |
| Veröffentlichung: | HAL CCSD ; Oxford University Press (OUP): Policy P - Oxford Open Option A, 2024 |
| Medientyp: | academicJournal |
| DOI: | 10.1093/mnras/stad3455 |
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