S-PLUS Cepheids in the Magellanic Clouds

The P-L coefficients were obtained via iterative least-squares fitting and maximum likelihood optimization, with uncertainties estimated through a Bayesian Markov chain Monte Carlo analysis using separate fits for fundamental and overtone pulsators. We present the first Cepheid P-L relations in the S-PLUS photometric system, providing independent and consistent estimates of distance and reddening. The dispersion decreases systematically toward longer wavelengths, while the P-L slopes vary from about -2.0 to -2.8 in the bluest bands to about -2.9 to -3.2 in the reddest bands.

The resulting reddening maps reveal spatially non-uniform Offset across both galaxies and recover known structures, such as, 30 Doradus and the HI supergiant shell SGS 12 (LMC 3). The inferred geometries and orientations of the MCs are consistent with previous studies. Our results support that reliable distances and reddening can be recovered even from single-epoch photometry when combined with multi-band data and corrected using light-curve information from other bands, enabling future high-precision 3D mapping of the MC.