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Aims: In this paper we focus on the occurrence of glycolaldehyde (HCOCH2OH)in young solar analogs by performing the first homogeneous and unbiased studyof this molecule in the Class 0 protostars of the nearby Perseus star formingregion. Methods: We obtained sub-arcsec angular resolution maps at 1.3mm and1.4mm of glycolaldehyde emission lines using the IRAM Plateau de Bure (PdB)interferometer in the framework of the CALYPSO IRAM large program. Results:Glycolaldehyde has been detected towards 3 Class 0 and 1 Class I protostars outof the 13 continuum sources targeted in Perseus: NGC1333-IRAS2A1,NGC1333-IRAS4A2, NGC1333-IRAS4B1, and SVS13-A. The NGC1333 star forming regionlooks particularly glycolaldehyde rich, with a rate of occurrence up to 60%.The glycolaldehyde spatial distribution overlaps with the continuum one,tracing the inner 100 au around the protostar. A large number of lines (up to18), with upper-level energies Eu from 37 K up to 375 K has been detected. Wederived column densities > 10^15 cm^-2 and rotational temperatures Trot between115 K and 236 K, imaging for the first time hot-corinos around NGC1333-IRAS4B1and SVS13-A. Conclusions: In multiple systems glycolaldehyde emission isdetected only in one component. The case of the SVS13-A+B and IRAS4-A1+A2systems support that the detection of glycolaldehyde (at least in the presentPerseus sample) indicates older protostars (i.e. SVS13-A and IRAS4-A2), evolvedenough to develop the hot-corino region (i.e. 100 K in the inner 100 au).However, only two systems do not allow us to firmly conclude whether theprimary factor leading to the detection of glycolaldehyde emission is theenvironments hosting the protostars, evolution (e.g. low value of Lsubmm/Lint),or accretion luminosity (high Lint).

Glycolaldehyde in Perseus young solar analogs