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Ramp Compression of Germanium Dioxide to Extreme Conditions: Phase Transitions in an ${SiO}_{2}$ Analog

https://doi.org/10.1103/PhysRevX.13.031025

Kim, D; Ocampo, I K; Smith, R F; Coppari, F; Millot, M; Wicks, J K; Rygg, J R; Eggert, J H; Duffy, T S (September 2023, Physical Review X)

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Structure and density of silicon carbide to 1.5 TPa and implications for extrasolar planets

https://doi.org/10.1038/s41467-022-29762-y

Kim, D.; Smith, R. F.; Ocampo, I. K.; Coppari, F.; Marshall, M. C.; Ginnane, M. K.; Wicks, J. K.; Tracy, S. J.; Millot, M.; Lazicki, A.; et al (December 2022, Nature Communications)

Abstract There has been considerable recent interest in the high-pressure behavior of silicon carbide, a potential major constituent of carbon-rich exoplanets. In this work, the atomic-level structure of SiC was determined through in situ X-ray diffraction under laser-driven ramp compression up to 1.5 TPa; stresses more than seven times greater than previous static and shock data. Here we show that the B1-type structure persists over this stress range and we have constrained its equation of state (EOS). Using this data we have determined the first experimentally based mass-radius curves for a hypothetical pure SiC planet. Interior structure models are constructed for planets consisting of a SiC-rich mantle and iron-rich core. Carbide planets are found to be ~10% less dense than corresponding terrestrial planets.
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Euclid: I. Overview of the Euclid mission

https://doi.org/10.1051/0004-6361/202450810

Mellier, Y; Abdurro’uf; Acevedo_Barroso, J A; Achúcarro, A; Adamek, J; Adam, R; Addison, G E; Aghanim, N; Aguena, M; Ajani, V; et al (May 2025, Astronomy & Astrophysics)

The current standard model of cosmology successfully describes a variety of measurements, but the nature of its main ingredients, dark matter and dark energy, remains unknown.Euclidis a medium-class mission in the Cosmic Vision 2015–2025 programme of the European Space Agency (ESA) that will provide high-resolution optical imaging, as well as near-infrared imaging and spectroscopy, over about 14 000 deg²of extragalactic sky. In addition to accurate weak lensing and clustering measurements that probe structure formation over half of the age of the Universe, its primary probes for cosmology, these exquisite data will enable a wide range of science. This paper provides a high-level overview of the mission, summarising the survey characteristics, the various data-processing steps, and data products. We also highlight the main science objectives and expected performance.
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