Speaker
Description
Polarimetric observations provide valuable insight into the geometry and physical mechanisms responsible for
optical emission in compact binary systems. In this work, we present multiwavelength (BVRI) optical
polarimetric measurements of the X-ray binary V4641 Sgr obtained during both outburst and quiescent phases,
as part of a broader multi-band campaign linking the optical behavior of the system to its Radio and X-ray
properties.
We characterize the polarization properties of the source across different epochs and wavelengths, including a
careful assessment of the contribution from interstellar polarization. The resulting intrinsic polarization
estimates are compared with previous polarimetric measurements of V4641 Sgr. Although the degree of
polarization is low, it exhibits notable band-dependent variations between outburst and quiescence. These
results allow us to explore several possible origins for the observed polarization, including contributions from
the jet, the hot inner accretion flow, and the accretion disc. In the era of NewAthena, the development of multiwavelength synergies will be essential, as demonstrated in this work.
