Comprehensive analysis of HD 105, a young Solar System analog

摘要: HD~105 is a nearby, pre-main sequence G0 star hosting moderately bright debris disc ($L_{\rm dust}/L_{\star} \sim 2.6\times10^{-4}$). and its surroundings might therefore be considered an analogue of the young Solar System. We refine stellar parameters based on improved Gaia parallax distance, identify it as {with age 50~$\pm$~16~Myr}. The circumstellar was marginally resolved by \textit{Herschel}/PACS imaging at far-infrared wavelengths. Here we present archival ALMA observation 1.3~mm, revealing extent orientation disc. also \textit{HST}/NICMOS VLT/SPHERE near-infrared images, where recover in scattered light $\geq$~5-$\sigma$ level. This achieved employing novel annular averaging technique, first time this has been for light. Simultaneous modelling available photometry, architecture, detection allow better determination disc's dust grain minimum size, composition, albedo. measure albedo to lie between 0.19 0.06, lower value being consistent with Edgeworth-Kuiper belt objects.