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

Hengst, S. and Marshall, J. P. and Horner, J. and Marsden, S. C. (2020) Multi-wavelength, spatially resolved modelling of HD 48682's debris disc. Monthly Notices of the Royal Astronomical Society, 497 (1). pp. 1098-1109. ISSN 0035-8711

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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 the structure using a single, axisymmetric annulus. A Markov chain Monte Carlo analysis calculated the maximum likelihood of HD48682's disc radius ( $R_{\rm disc} = 89^{+17}_{-20}~$ au), fractional width ( $\Delta R_{\rm disc} = 0.41^{+0.27}_{-0.20}$ ), position angle ( $\theta = 66{_{.}^{\circ}} 3^{+4.5}_{-4.9}$ ), and inclination ( $\phi = 112{_{.}^{\circ}} 5^{+4.2}_{-4.2}$ ). HD 48682 has been revealed to host a collisionally active, broad disc whose emission is dominated by small dust grains, s<SUB>min</SUB> ∼ 0.6 μm, and a size distribution exponent of 3.60 ± 0.02.

A correction has been published: Monthly Notices of the Royal Astronomical Society, Volume 499, Issue 1, November 2020, Pages 616–617, https://doi.org/10.1093/mnras/staa2874


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: A correction has been published: http://eprints.usq.edu.au/39900/
Faculty/School / Institute/Centre: Current - Institute for Advanced Engineering and Space Sciences - Centre for Astrophysics (1 Aug 2018 -)
Faculty/School / Institute/Centre: Current - Institute for Advanced Engineering and Space Sciences - Centre for Astrophysics (1 Aug 2018 -)
Date Deposited: 14 Oct 2020 23:54
Last Modified: 27 Jan 2021 00:29
Uncontrolled Keywords: circumstellar matter; stars: individual: HD 48682; infrared:; planetary systems; infrared: stars; Astrophysics - Earth and Planetary; Astrophysics; Astrophysics - Astrophysics of Galaxies; Astrophysics -; Solar and Stellar Astrophysics
Fields of Research (2008): 02 Physical Sciences > 0201 Astronomical and Space Sciences > 020110 Stellar Astronomy and Planetary Systems
Fields of Research (2020): 51 PHYSICAL SCIENCES > 5101 Astronomical sciences > 510109 Stellar astronomy and planetary systems
Socio-Economic Objectives (2008): E Expanding Knowledge > 97 Expanding Knowledge > 970102 Expanding Knowledge in the Physical Sciences
Socio-Economic Objectives (2020): 28 EXPANDING KNOWLEDGE > 2801 Expanding knowledge > 280120 Expanding knowledge in the physical sciences
Identification Number or DOI: https://doi.org/10.1093/mnras/staa1972
URI: http://eprints.usq.edu.au/id/eprint/39886

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