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Characterising stellar and circumstellar properties of embedded young stellarobjects (YSOs) is mandatory for understanding the early stages of the stellarevolution. This task requires the combination of both spectroscopy andphotometry, covering the widest possible wavelength range, to disentangle thevarious protostellar components and activities. As part of the POISSON project,we present a multi-wavelength spectroscopic and photometric investigation ofembedded YSOs in L1641, aimed to derive the stellar parameters and evolutionarystages and to infer their accretion properties. Our database includeslow-resolution optical-IR spectra from the NTT and Spitzer (0.6-40 um) andphotometric data covering a spectral range from 0.4 to 1100 um, which allow usto construct the YSOs spectral energy distributions (SEDs) and to infer themain stellar parameters. The SED analysis allows us to group our 27 YSOs intonine Class I, eleven Flat, and seven Class II objects. However, on the basis ofthe derived stellar properties, only six Class I YSOs have an age of ~10^5 yr,while the others are older 5x10^5-10^6 yr), and, among the Flat sources, threeout of eleven are more evolved objects (5x10^6-10^7 yr), indicating thatgeometrical effects can significantly modify the SED shapes. Inferred massaccretion rates (Macc) show a wide range of values (3.6x10^-9 to 1.2x10^-5M_sun yr^-1), which reflects the age spread observed in our sample. Averagevalues of mass accretion rates, extinction, and spectral indices decrease withthe YSO class. The youngest YSOs have the highest Macc, whereas the oldest YSOsdo not show any detectable jet activity in either images and spectra. We alsoobserve a clear correlation among the YSO Macc, M*, and age, consistent withmass accretion evolution in viscous disc models.

POISSON project - II - A multi-wavelength spectroscopic and photometric survey of young protostars in L 1641