POLLUX is a high-resolution, UV spectropolarimeter proposed for the
15-meter primary mirror option of LUVOIR.
The instrument Phase 0 study started in January 2017. It is led by LAM
and LESIA with the support of the French Space Agency (CNES), and
performed by a consortium of European scientists.
POLLUX has been designed to deliver high-resolution spectroscopy (R ≥ 120,000) over a broad spectral range (90 - 400 nm). Its unique spectropolarimetric capabilities will open-up a vast new parameter space, in particular in the unexplored UV domain and in a regime where high-resolution observations with current facilities in the visible domain are severely photon starved.
POLLUX will address a range of questions at the core of the LUVOIR
Science portfolio. The combination of high resolution and broad
coverage of the UV bandpass will resolve narrow UV emission and
absorption lines originating in diffuse media, thus permitting the
study of the baryon cycle over cosmic time: from galaxies forming
stars out of interstellar gas and grains, and stars forming planets,
to the various forms of feedback into the interstellar and
intergalactic medium (ISM and IGM), and active galactic nuclei (AGN).
UV circular and linear polarimetry will reveal the magnetic fields for
a wide variety of objects for the first time, from AGN outflows to a
diverse range of stars, stellar explosions (both supernovae and their
remnants), the ISM and IGM. It will enable detection of polarized
light reflected from exoplanets (or their circumplanetary material and
moons), characterization of the magnetospheres of stars and planets
(and their interactions), and measurements of the influence of
magnetic fields at the (inter)galactic scale.