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We are performing a series of observations with ground-based telescopestoward Planck Galactic cold clumps (PGCCs) in the $\lambda$ Orionis complex inorder to systematically investigate the effects of stellar feedback. In theparticular case of PGCC G192.32-11.88, we discovered an extremely young Class 0protostellar object (G192N) and a proto-brown dwarf candidate (G192S). G192Nand G192S are located in a gravitationally bound bright-rimmed clump. Thevelocity and temperature gradients seen in line emission of CO isotopologuesindicate that PGCC G192.32-11.88 is externally heated and compressed. G192Nprobably has the lowest bolometric luminosity ($\sim0.8$ L$_{\sun}$) andaccretion rate (6.3$\times10^{-7}$ M$_{\sun}$~yr$^{-1}$) when compared withother young Class 0 sources (e.g. PACS Bright Red sources (PBRs)) in the Orioncomplex. It has slightly larger internal luminosity ($0.21\pm0.01$ L$_{\sun}$)and outflow velocity ($\sim$14 km~s$^{-1}$) than the predictions of firsthydrostatic cores (FHSCs). G192N might be among the youngest Class 0 sources,which are slightly more evolved than a FHSC. Considering its low internalluminosity ($0.08\pm0.01$ L$_{\odot}$) and accretion rate (2.8$\times10^{-8}$M$_{\sun}$~yr$^{-1}$), G192S is an ideal proto-brown dwarf candidate. The starformation efficiency ($\sim$0.3\%-0.4\%) and core formation efficiency($\sim$1\%) in PGCC G192.32-11.88 are significantly smaller than in other giantmolecular clouds or filaments, indicating that the star formation therein isgreatly suppressed due to stellar feedback.

the astrophysical journal. supplement series/astrophysical journal. supplement series

Planck cold clumps in the $\lambda$ Orionis complex: I. Discovery of an  extremely young Class 0 protostellar object and a proto-brown dwarf candidate  in a bright rimmed clump PGCC G192.32-11.88