Polarimetry of the potential binary supermassive black hole system in J1430+2303

The growth of supermassive black holes (SMBHs) through merging has long been predicted but its detection remains elusive. However, a promising target discovered in the Seyfert-1 galaxy J1430+2303. If binary system truly lies at center J1430+2303, usual symmetry expected from pole-on views active galactic nuclei (AGNs) responsible for observed low ($\le$ 1\%) optical linear polarization continuum these objects is to be broken. This should lead higher-than-usual degrees, together with time-dependent variations signal. We used specialized photopolarimeters RoboPol mounted on 1.3m telescope Skinakas Observatory and Alhambra Faint Object Spectrograph Camera (ALFOSC) 2.56m Nordic Optical Telescope (NOT) "Roque de los Muchachos" measure B-, V-, R-, I-band Observations were complemented using FORS2 spectropolarimeter VLT acquire 3500 -- 8650 Angs polarized spectra. compared our set observations Monte Carlo radiative-transfer predictions look presence SMBH binary. J1430+2303 V R bands $\sim$ 0.4\% an associated angle slightly larger than 0$^\circ$. detected no significant changes or photometry between May, June, July 2022. In addition, there difference H$\alpha$ continuum. A single AGN model able reproduce spectrum polarization, while hypothesis rejected probability $\sim$85\%.