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We conducted an infrared search for faint companions around 351 young stellarobjects in the rho Ophiucus molecular cloud and the Serpens molecular cloud.Nine objects in the Spitzer/IRAC archival images were identified as youngstellar companion candidates. They showed an intrinsic infrared excess; oneobject was extremely red both in the [3.6] - [4.5] color and in the [4.5] -[5.8] color, and two objects were red in the [4.5] - [5.8] color. They were asfaint as 15 mag in the [3.6] band. Follow-up K-band spectroscopy revealed thatthree objects had deep water absorption bands, indicative of low effectivetemperatures. By comparing the spectra and infrared spectral energydistributions with synthesized spectra of low-temperature objects, we derivedthe effective temperatures and continuum excess for these objects. It seemshighly likely that one of the three objects is a low-mass stellar companion andtwo objects are young brown dwarf companions associated with the young stellarobjects.

Infrared Search for Young Brown Dwarf Companions around Young Stellar Objects in the rho Ophiucus Molecular Cloud and the Serpens Molecular Cloud