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

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          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.

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          Author and article information

          Journal
          24 June 2020
          Article
          2006.13614
          0907ab19-03dd-4db5-b258-5bf68cd4718e

          http://arxiv.org/licenses/nonexclusive-distrib/1.0/

          History
          Custom metadata
          13 Pages, 6 figures, to be published in MNRAS
          astro-ph.EP astro-ph.GA astro-ph.SR

          Planetary astrophysics,Galaxy astrophysics,Solar & Stellar astrophysics
          Planetary astrophysics, Galaxy astrophysics, Solar & Stellar astrophysics

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