The debris disc of HD 131488
- Author(s)
- Nicole Pawellek, Attila Moór, Florian Kirchschlager, Julien Milli, Ágnes Kóspál, Péter Ábrahám, Sebastian Marino, Mark Wyatt, Isabel Rebollido, A. Meredith Hughes, Faustine Cantalloube, Thomas Henning
- 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.
- Organisation(s)
- Department of Astrophysics
- External organisation(s)
- HUN-REN Hungarian Research Network, Eötvös Loránd Research Network, University College London, Ghent University , University of Grenoble Alpes, Eötvös Loránd University Budapest, Max-Planck-Institut für Astronomie, University of Exeter, University of Cambridge, Centro de Astrobiología (CSIC-INTA), Wesleyan University, Aix-Marseille Université
- Journal
- MNRAS
- Volume
- 527
- Pages
- 3559-3584
- No. of pages
- 26
- ISSN
- 0035-8711
- DOI
- https://doi.org/10.1093/mnras/stad3455
- Publication date
- 11-2023
- Peer reviewed
- Yes
- Austrian Fields of Science 2012
- 103004 Astrophysics
- Keywords
- ASJC Scopus subject areas
- Astronomy and Astrophysics, Space and Planetary Science
- Portal url
- https://ucrisportal.univie.ac.at/en/publications/f2d5bc55-53cc-4bd5-912c-b93bd25e9383