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CASSTOR: a scientific and technology nanosatellite demonstrator for UV spectropolarimetry

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arxiv 2507.03956 v1 pith:JQZ5CDCV submitted 2025-07-05 astro-ph.IM

CASSTOR: a scientific and technology nanosatellite demonstrator for UV spectropolarimetry

Coralie Neiner , Vincent Lapeyrere , Eitan Pechevis , Claude Catala , Boris Segret , Feliu Lacreu , Rashika Jain , Jean-Michel Reess
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Frederic Esteve Charles-Antoine Chevrier Jean-Luc Le Gal Laurent Doumic Adrien Saada Maelle Le Gal Olivier Dupuis Alexandre Dupuy Jean-Francois Aubrun Romain Pinede Aurelien Ledot Andre Laurens Tristan Buey
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keywords casstornanosatelliteseveralspectropolarimetryaragocontextdemonstratordeveloping
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In the context of the development of several space mission projects for UV spectropolarimetry at high resolution and over a wide UV wavelength range, such as Arago, Polstar, and Pollux onboard the Habitable Worlds Observatory, we are studying and developing the UV nanosatellite CASSTOR to obtain the very first UV spectropolarimetric observations of hot stars and test several new technologies, in particular a UV polarimeter and a Fine Guiding System. In this paper, we present the work and outcome of the Phase 0 study of CASSTOR.

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  1. Pollux UV & FUV polarimeters: first lab results

    astro-ph.IM 2026-08 conditional novelty 4.0

    First laboratory results from the Pollux UV test bench demonstrate working polarization generation, a first end-to-end polarimetric measurement, and a far-UV analyser with extinction ratio 10 at 120 nm.