Astronomy and Astrophysics – Astrophysics – Solar and Stellar Astrophysics
Scientific paper
2011-06-03
Astronomy and Astrophysics
Astrophysics
Solar and Stellar Astrophysics
11 pages, 7 figures. P.A.S.J. accepted
Scientific paper
We conducted an infrared search for faint companions around 351 young stellar objects in the rho Ophiucus molecular cloud and the Serpens molecular cloud. Nine objects in the Spitzer/IRAC archival images were identified as young stellar companion candidates. They showed an intrinsic infrared excess; one object 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 as faint as 15 mag in the [3.6] band. Follow-up K-band spectroscopy revealed that three objects had deep water absorption bands, indicative of low effective temperatures. By comparing the spectra and infrared spectral energy distributions with synthesized spectra of low-temperature objects, we derived the effective temperatures and continuum excess for these objects. It seems highly likely that one of the three objects is a low-mass stellar companion and two objects are young brown dwarf companions associated with the young stellar objects.
Itoh Yoichi
Oasa Yumiko
Shirono Chiaki
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