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A detailed study spanning approximately a year has been conducted on the TypeIb supernova 2007Y. Imaging was obtained from X-ray to radio wavelengths, and acomprehensive set of multi-band (w2m2w1u'g'r'i'UBVYJHKs) light curves andoptical spectroscopy is presented. A virtually complete bolometric light curveis derived, from which we infer a (56)Ni-mass of 0.06 M_sun. The early spectrumstrongly resembles SN 2005bf and exhibits high-velocity features of CaII andH_alpha; during late epochs the spectrum shows evidence of a ejecta-windinteraction. Nebular emission lines have similar widths and exhibit profilesthat indicate a lack of major asymmetry in the ejecta. Late phase spectra aremodeled with a non-LTE code, from which we find (56)Ni, O and total-ejectamasses (excluding He) to be 0.06, 0.2 and 0.42 M_sun, respectively, below 4,500km/s. The (56)Ni mass confirms results obtained from the bolometric lightcurve. The oxygen abundance suggests the progenitor was most likely a ~3.3M_sun He core star that evolved from a zero-age-main-sequence mass of 10-13M_sun. The explosion energy is determined to be ~10^50 erg, and the mass-lossrate of the progenitor is constrained from X-ray and radio observations to be<~10^-6 M_sun/yr. SN 2007Y is among the least energetic normal Type Ibsupernovae ever studied.

The He-rich core-collapse supernova 2007Y: Observations from X-ray to Radio Wavelengths