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Post Info TOPIC: Supernova 2010mc
Blobrana


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RE: Supernova 2010mc
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Title: A binary scenario for the pre-explosion outburst of the supernova 2010mc
Authors: Noam Soker (Technion, Israel)

I raise the possibility that the pre-explosion outburst (PEO) of the type IIn supernova 2010mc (PTF 10tel) was energised by mass accretion onto an O main-sequence stellar companion. According to this suggestion the SN progenitor suffered a rapid expansion within months before explosion. The expansion was driven by leakage of energy from the core where vigorous oxygen nuclear burning takes place within a year prior to explosion. This expansion triggered mass transfer onto the secondary star. Most of the extra energy of the outburst comes from the accretion of ~0.1Mo onto the secondary star. As well, the gas outflowing at v~2000 km/s was launched from the accreting secondary star, most likely in a bipolar outflow. The binary model can account for the slower circumstellar medium that was ejected at earlier times, and explain the red-shifted peak of the Halpha emission at 5.8 days past explosion. I compare some properties of the PEO of SN 2010mc to those of other stellar eruptions, such as the stellar merger event V838 Monocerotis and the nineteenth century Great Eruption of the massive stellar binary system Eta Carinae. I speculate that all Type IIn supernovae owe their dense circumstellar gas to binary interaction.

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Blobrana


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Title: An outburst from a massive star 40 days before a supernova explosion
Authors: E. O. Ofek, M. Sullivan, S. B. Cenko, M. M. Kasliwal, A. Gal-Yam, S. R. Kulkarni, I. Arcavi, L. Bildsten, J. S. Bloom, A. Horesh, D. A. Howell, A. V. Filippenko, R. Laher, D. Murray, E. Nakar, P. E. Nugent, J. M. Silverman, N. J. Shaviv, J. Surace, O. Yaron

Various lines of evidence suggest that very massive stars experience extreme mass-loss episodes shortly before they explode as a supernova. Interestingly, several models predict such pre-explosion outbursts. Establishing a causal connection between these mass-loss episodes and the final supernova explosion will provide a novel way to study pre-supernova massive-star evolution. Here we report on observations of a remarkable mass-loss event detected 40 days prior to the explosion of the Type IIn supernova SN 2010mc (PTF 10tel). Our photometric and spectroscopic data suggest that this event is a result of an energetic outburst, radiating at least 6x10^47 erg of energy, and releasing about 0.01 Solar mass at typical velocities of 2000 km/s. We show that the temporal proximity of the mass-loss outburst and the supernova explosion implies a causal connection between them. Moreover, we find that the outburst luminosity and velocity are consistent with the predictions of the wave-driven pulsation model and disfavour alternative suggestions.

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Blobrana


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Posts: 131433
Date:
PTF 10tel
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The Last Big Bump Before a Supernova Explodes

On August 25, 2010, PTF's "autonomous machine-learning framework," developed by Josh Bloom of Berkeley Lab's Physics Division and Peter Nugent of the Computational Research Division (both are also with UC Berkeley's Department of Astronomy) and their colleagues, was combing through recent data and came upon a Type IIn supernova, half a billion light years away in the constellation Hercules. The supernova was eventually labelled SN 2010mc.
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Blobrana


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Posts: 131433
Date:
RE: Supernova 2010mc
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Three years ago a giant star gave us a signal of its impending destruction just 40 days before it happened.
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Blobrana


L

Posts: 131433
Date:
Permalink  
 

Title: An outburst from a massive star 40 days before a supernova explosion
Authors: E. O. Ofek, M. Sullivan, S. B. Cenko, M. M. Kasliwal, A. Gal-Yam, S. R. Kulkarni, I. Arcavi, L. Bildsten, J. S. Bloom, A. Horesh, D. A. Howell, A. V. Filippenko, R. Laher, D. Murray, E. Nakar, P. E. Nugent, J. M. Silverman, N. J. Shaviv, J. Surace & O. Yaron

Some observations suggest that very massive stars experience extreme mass-loss episodes shortly before they explode as supernovae, as do several models. Establishing a causal connection between these mass-loss episodes and the final explosion would provide a novel way to study pre-supernova massive-star evolution. Here we report observations of a mass-loss event detected 40 days before the explosion of the type IIn supernova SN 2010mc (also known as PTF 10tel).

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