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Conference Papers Year : 2020

Spatially resolving the chemical composition of the planet building blocks

Abstract

The inner regions (0.1-10 au) of protoplanetary discs are the expected birthplace of telluric planets. In those hot regions, solids can experience cyclical annealing, vapourisation, and recondensation. Hot/warm dust grains emit mostly in the IR, notably in N-band (8-13 ?m). Studying their chemistry with the new MIR VLTI instrument MATISSE, which can spatially resolve those regions, requires detailed dust chemistry models. Using radiative transfer, we derived IR spectra of a fiducial static disc model with different inner-disc (<1 au) dust compositions. The latter were derived from condensation sequences computed at LTE for three initial C/O ratios: 0.4 (subsolar), 0.54 (solar), 1 (supersolar). The three scenarios return very different N-band spectra that MATISSE should be able to discriminate. From that, we propose a first interpretation of N-band 'inner-disc' spectra obtained with the former VLTI instrument MIDI on several YSOs, and show recently obtained MATISSE N-band spectra.
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Dates and versions

insu-03584465 , version 1 (22-02-2022)

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Alexis Matter, F. Pignatale, B. Lopez. Spatially resolving the chemical composition of the planet building blocks. Ground-Based Thermal Infrared Astronomy - Past, 2020, à renseigner, Unknown Region. pp.533-542, ⟨10.5281/zenodo.4249931⟩. ⟨insu-03584465⟩
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