Multi-wavelength, spatially resolved modelling of HD 48682's debris disc

Abstract

Asteroids and comets (planetesimals) are created in gas- and dust-rich protoplanetary discs. The presence of these planetesimals around main-sequence stars is usually inferred from the detection of excess continuum emission at infrared wavelengths from dust grains produced by destructive processes within these discs. Modelling of the disc structure and dust grain properties for those discs is often hindered by the absence of any meaningful constraint on the location and spatial extent of the disc. Multi-wavelength, spatially resolved imaging is thus invaluable in refining the interpretation of these systems. Observations of HD 48682 at far-infrared (Spitzer,Herschel) and sub-millimetre (JCMT, SMA) wavelengths indicated the presence of an extended, cold debris disc with a blackbody temperature of 57.9 +\- 0.7 K. Here, we combined these data to perform a comprehensive study of the disc architecture and its implications for the dust grain properties. The deconvolved images revealed a cold debris belt, verified by combining a 3D radiative transfer dust continuum model with image analysis to replicate thestructure using a single, axisymmetric annulus. A Markov chain Monte Carlo analysis calculated the maximum likelihood of HD 48682's disc radius (Rdisc = 89 +17 -20 au), fractional width(DeltaRdisc = 0.41 +0.27 -0.20), position angle (theta = 66.3 +4.5 -4.9 degrees), and inclination (phi = 112.5 +4.2 -4.2 degrees). HD 48682 has been revealed to host a collisionally active, broad disc whose emission is dominated by small dust grains, smin approx. 0.6 microns, and a size distribution exponent of 3.60 +\- 0.02.

arXiv comment13 Pages, 6 figures, to be published in MNRAS

References in corpus (69)

• emcee: The MCMC Hammer
• Gaia Data Release 2. Summary of the contents and survey properties
• The Wide-field Infrared Survey Explorer (WISE): Mission Description and Initial On-orbit Performance
• Herschel Space Observatory - An ESA facility for far-infrared and submillimetre astronomy
• The Spitzer Space Telescope Mission
• The Photodetector Array Camera and Spectrometer (PACS) on the Herschel Space Observatory
• The Herschel-SPIRE instrument and its in-flight performance
• The Infrared Spectrograph on the Spitzer Space Telescope
• The Disk Substructures at High Angular Resolution Project (DSHARP): I. Motivation, Sample, Calibration, and Overview
• Scattering by Interstellar Dust Grains: Optical and Ultraviolet
• The AKARI/IRC Mid-Infrared All-Sky Survey
• The Submillimeter Array
• SCUBA-2: The 10000 pixel bolometer camera on the James Clerk Maxwell Telescope
• The Geneva-Copenhagen Survey of the Solar neighbourhood III. Improved distances, ages, and kinematics
• New Grids of ATLAS9 Model Atmospheres
• How Observations of Circumstellar Disk Asymmetries Can Reveal Hidden Planets: Pericenter Glow and its Application to the HR 4796 Disk
• Structure and Evolution of Nearby Stars with Planets II. Physical Properties of ~1000 Cool Stars from the SPOCS Catalog
• Transience of hot dust around sun-like stars
• Debris Disks: Structure, Composition, and Variability
• CASSIS: The Cornell Atlas of Spitzer/IRS Sources
• Spitzer IRS Spectroscopy of IRAS-Discovered Debris Disks
• SCUBA-2: on-sky calibration using submillimetre standard sources
• HYPERION: An open-source parallelized three-dimensional dust continuum radiative transfer code
• DUst Around NEarby Stars. The survey observational results
• Debris Disks: Seeing Dust, Thinking of Planetesimals and Planets
• The Herschel-PACS photometer calibration: Point-source flux calibration for scan maps
• Dusty Debris Around Solar-Type Stars: Temporal Disk Evolution
• Nine localised deviations from Keplerian rotation in the DSHARP circumstellar disks: Kinematic evidence for protoplanets carving the gaps
• Exocometary gas in the HD 181327 debris ring
• Resolved Debris Discs Around A Stars in the Herschel DEBRIS Survey
• Predictions for the secondary CO, C and O gas content of debris discs from the destruction of volatile-rich planetesimals
• Detection of exocometary CO within the 440 Myr-old Fomalhaut belt: a similar CO+CO${}_2$ ice abundance in exocomets and Solar System comets
• SONS: The JCMT legacy survey of debris discs in the submillimetre
• Analysis of the Herschel DEBRIS Sun-like star sample
• Disk Radii and Grain Sizes in Herschel-Resolved Debris Disks
• A Complete ALMA Map of the Fomalhaut Debris Disk
• The dust grain size - stellar luminosity trend in debris discs
• ALMA observations of the $\eta$ Corvi debris disc: inward scattering of CO-rich exocomets by a chain of 3-30 M${}_{\oplus }$ planets?
• Five steps in the evolution from protoplanetary to debris disk
• Sub-mm observations and modelling of Vega type stars
• Sublimation Temperature of Circumstellar Dust Particles and Its Importance for Dust Ring Formation
• The age dependence of the Vega phenomenon: Observations
• A gap in the planetesimal disc around HD 107146 and asymmetric warm dust emission revealed by ALMA
• An Empirical Planetesimal Belt Radius - Stellar Luminosity Relation
• IRS Spectra of Solar-Type Stars: \break A Search for Asteroid Belt Analogs
• Stirring in massive, young debris discs from spatially resolved Herschel images
• Constraints on Planetesimal Collision Models in Debris Disks
• Apocenter glow in eccentric debris disks: implications for Fomalhaut and epsilon Eridani
• Gas and dust around A-type stars at tens of Myr:signatures of cometary breakup
• Resolving the cold debris disc around a planet-hosting star: PACS photometric imaging observations of q1 Eri (HD10647, HR506)
• Observations, Modeling and Theory of Debris Disks
• A Herschel resolved far-infrared dust ring around HD 207129
• Population synthesis of exocometary gas around A stars
• ALMA Detection of Extended Millimeter Halos in the HD 32297 and HD 61005 Debris Disks
• The Herschel Data Processing System - HIPE and Pipelines - Up and Running Since the Start of the Mission
• The Scattered Disc of HR 8799
• ALMA 1.3 Millimeter Map of the HD 95086 System
• Resolved Millimeter-Wavelength Observations of Debris Disks around Solar-Type Stars
• The Pointing System of the Herschel Space Observatory. Description, Calibration, Performance and Improvements
• A peculiar class of debris disks from Herschel/DUNES - A steep fall off in the far infrared
• A plethora of new R Coronae Borealis stars discovered from a dedicated spectroscopic follow-up survey
• Origin and evolution of two-component debris discs and an application to the q${}^1$ Eridani system
• The REASONS Survey: Resolved Millimeter Observations of a Large Debris Disk Around the Nearby F Star HD 170773
• New constraints on the millimetre emission of six debris disks
• Interpreting the extended emission around three nearby debris disc host stars
• Potential multi-component structure of the debris disk around HIP 17439 revealed by Herschel/DUNES
• A Herschel resolved debris disc around HD 105211
• The main sequence from F to K stars of the solar neighbourhood in SDSS colours
• Steady-state evolution of debris disks around solar-type stars

Cited by in corpus (4)

• Planet populations inferred from debris discs: insights from 178 debris systems in the ISPY, LEECH and LIStEN planet-hunting surveys
• Multiwavelength Vertical Structure in the AU Mic Debris Disk: Characterizing the Collisional Cascade
• Radial velocity analysis of stars with debris discs
• SPORES-HWO. II. Companion Mass Limits and Updated Planet Properties for 120 Future Exoplanet Imaging Targets from 35 yr of Precise Doppler Monitoring