THE HE-RICH CORE-COLLAPSE SUPERNOVA 2007Y: OBSERVATIONS FROM X-RAY TO RADIO WAVELENGTHS
- Las Campanas Observatory, Carnegie Observatories, Casilla 601, La Serena (Chile)
A detailed study spanning approximately a year has been conducted on the Type Ib supernova (SN) 2007Y. Imaging was obtained from X-ray to radio wavelengths, and a comprehensive set of multi-band (w2m2w1u'g'r'i'UBVYJHK{sub s} ) light curves and optical spectroscopy is presented. A virtually complete bolometric light curve is derived, from which we infer a {sup 56}Ni mass of 0.06 M {sub sun}. The early spectrum strongly resembles SN 2005bf and exhibits high-velocity features of Ca II and H{alpha}; during late epochs the spectrum shows evidence of an ejecta-wind interaction. Nebular emission lines have similar widths and exhibit profiles that indicate a lack of major asymmetry in the ejecta. Late phase spectra are modeled with a non-LTE code, from which we find {sup 56}Ni, O, and total-ejecta masses (excluding He) to be 0.06, 0.2, and 0.42 M {sub sun}, respectively, below 4500 km s{sup -1}. The {sup 56}Ni mass confirms results obtained from the bolometric light curve. The oxygen abundance suggests that the progenitor was most likely a {approx}3.3 M {sub sun} He core star that evolved from a zero-age-main-sequence mass of 10-13 M {sub sun}. The explosion energy is determined to be {approx}10{sup 50} erg, and the mass-loss rate of the progenitor is constrained from X-ray and radio observations to be {approx}<10{sup -6} M {sub sun} yr{sup -1}. SN 2007Y is among the least energetic normal Type Ib SNe ever studied.
- OSTI ID:
- 21300722
- Journal Information:
- Astrophysical Journal, Vol. 696, Issue 1; Other Information: DOI: 10.1088/0004-637X/696/1/713; Country of input: International Atomic Energy Agency (IAEA); ISSN 0004-637X
- Country of Publication:
- United States
- Language:
- English
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