Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21924236s&link_type=abstract
American Astronomical Society, AAS Meeting #219, #242.36
Astronomy and Astrophysics
Astronomy
Scientific paper
We present photometry and spectroscopy of the peculiar Type II supernova (SN) 2010jp, also named PTF10aaxi. The light curve exhibits a linear decline with a relatively low peak absolute magnitude of only -15.9 (unfiltered), and a low radioactive decay luminosity at late times that suggests a low synthesized nickel mass of M(56Ni)< 0.003 Msun. Spectra of SN2010jp display an unprecedented triple-peaked H-alpha line profile, showing: (1) a narrow central component that suggests shock interaction with a dense circumstellar medium (CSM); (2) high-velocity blue and red emission features centered at -12,600 and +15,400 km/s; and (3) very broad wings extending from -22,000 to +25,000 km s/1. These features persist over multiple epochs during the 100 days after explosion. We propose that this line profile indicates a bipolar jet-driven explosion, with the central component produced by normal SN ejecta and CSM interaction at mid and low latitudes, while the high-velocity bumps and broad line wings arise in a nonrelativistic bipolar jet. Two variations of the jet interpretation seem plausible: (1) A fast jet mixes 56Ni to high velocities in polar zones of the H-rich envelope, or (2) the reverse shock in the jet produces blue and red bumps in Balmer lines when a jet interacts with dense CSM. Jet-driven SNe II are predicted for collapsars resulting from a wide range of initial masses above 25 Msun, especially at sub-solar metallicity. This seems consistent with the SN host environent, which is either an extremely low luminosity dwarf galaxy or the remote parts of an interacting pair of galaxies, and with the apparently low 56Ni mass that may accompany black hole formation. We speculate that the jet survives to produce observable signatures because the star's H envelope was very low mass.
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