Sub-mm/mm optical properties of real protoplanetary matter derived from Rosetta/MIRO observations of comet 67P

• DOI: 10.1093/mnras/stac3420
• Publication Date: 2022-11-25T01:49:21Z
• Authors: Johanna Bürger; Thilo Glißmann; Anthony Lethuillier; Dorothea Bischoff; Bastian Gundlach; Harald Mutschke; Sonja Höfer; Sebastian Wolf; Jürgen Blum
• Keywords: Earth and Planetary Astrophysics (astro-ph.EP); 13. Climate action; 0103 physical sciences; FOS: Physical sciences; Astrophysics - Instrumentation and Methods for Astrophysics; Instrumentation and Methods for Astrophysics (astro-ph.IM); 01 natural sciences; Astrophysics - Earth and Planetary Astrophysics

ABSTRACT Optical properties are required for the correct understanding and modelling of protoplanetary debris discs. By assuming that comets most pristine bodies in Solar system, our goal is to derive optical constants real material. We determine complex index refraction near-surface material comet 67P/Churyumov–Gerasimenko by fitting sub-millimetre/millimetre observations thermal emission comet’s sub-surface made Microwave Instrument Rosetta Orbiter with synthetic temperatures derived from a thermophysical model radiative-transfer models. According two major formation scenarios comets, we layers consist pebbles as well homogeneously packed dust grains. In case homogeneous dusty surface material, find solution length-absorption coefficient α ≈ 0.22 cm−1 wavelength 1.594 mm ≥ 3.84 0.533 constant conductivity 0.006 W m−1 K−1. For pebble scenario, refractive $n = (1.074 \!-\! 1.256) + \mathit{i} \, (2.580 7.431)\times 10^{-3}$ radii between 1 6 mm. Taking into account other constraints, results point towards make-up cometary 3 The part used constrain composition their volume filling factor. physical discussed context disc observations.