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.
The Polstar UV Spectropolarimetry Mission
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abstract
The Polstar small explorer concept is for an ultraviolet (UV) spectropolarimetry space telescope mission with a focus on massive star astrophysics. The instrument waveband will be from 115 nm - 286 nm for spectroscopy and 122 nm - 286 nm for polarimetry. All 4 Stokes parameters, IQUV, will be measured at a resolving power of R=20,000 (15 km/s velocity resolution). The telescope aperture will be 40 cm with an effective area of about 22 cm^2 at a reference wavelength of 150 nm. The thrust of the science goals will be to determine the astrophysics of angular momentum exchange and transport, and consequences for massive star properties and evolution. This includes the effects of rapid to critical rotation for individual stars (magnetic and non-magnetic), and the effects of mass transfer for massive binaries, including identification of stripped core stars. If selected by the NASA/SMEX program, Polstar would launch around 2031 and observe ~300 stars to achieve science goals. The mission will include a Guest Observer program to advance discovery in other areas of astrophysics.
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astro-ph.IM 1years
2026 1verdicts
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Pollux UV & FUV polarimeters: first lab results
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.