The study of the Cosmic Microwave Background (CMB) is a powerful tool to study the primitive Universe. The detection of primordial B-modes is an important milestone in cosmology, because it would confirm the presence of gravitational waves in the primordial Universe generated in the inflationary epoch. Up to now, the B-modes induced by primordial gravitational waves remain undetected. In this context, the foreground emission of the Galaxy is a dominant element that limits the determination of the signal of interest. Therefore, a comprehensive characterization of the galactic and extragalactic foregrounds is essential to clean and recover the primordial B-mode signal out of the CMB observations. In this poster, we present the implementation and testing of the HIT Fitting method (Hybrid Internal combination with Template Fitting). This is a new approach based on the internal linear combination (ILC) and internal template fitting (ITF) methods, which is devoted to recovering the CMB signal. In particular, we discuss their bias properties using multifrequency simulations of CMB experiments.

{"references": ["Eriksen H. K. et al. 2004, ApJ, 612, 633", "Fern\u00e1ndez-Cobos R. et al. 2012 , MNRAS, 420, 2162", "Fern\u00e1ndez-Cobos R. et al. 2016, MNRAS, 459, 441", "Hinshaw G. et al. 2007, ApJS, 170, 288", "L\u00f3pez-Caraballo, C. et al. 2019, BAAA, 61, 215", "Planck Collab. et al. 2020, A&A 641, A1", "Thorne B. et al. 2017, MNRAS, 469, 2821"]}