Rapidly decaying supernova 2010X: a candidate ".Ia" explosion

Kasliwal, Mansi M., Kulkarni, S.R., Gal-Yam, Avishay, Yaron, Ofer, Quimby, Robert M., Ofek, Eran O., Nugent, Peter, Poznanski, Dovi, Jacobsen, Janet, Sternberg, Assaf, Arcavi, Iair, Howell, D. Andrew, Sullivan, Mark, Rich, Douglas J., Burke, Paul F., Brimacombe, Joseph, Milisavljevic, Dan, Fesen, Robert, Bildsten, Lars, Shen, Ken, Cenko, S. Bradley, Bloom, Joshua S., Hsiao, Eric, Law, Nicholas M., Gehrels, Neil, Immler, Stefan, Dekany, Richard, Rahmer, Gustavo, Hale, David, Smith, Roger, Zolkower, Jeff, Velur, Viswa, Walters, Richard, Henning, John, Bui, Kahnh, and McKenna, Dan (2010) Rapidly decaying supernova 2010X: a candidate ".Ia" explosion. Astrophysical Journal Letters, 723 (1). L98-L102.

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We present the discovery, photometric, and spectroscopic follow-up observations of SN 2010X (PTF 10bhp). This supernova decays exponentially with τ d = 5 days and rivals the current recordholder in speed, SN 2002bj. SN 2010X peaks at M r = –17 mag and has mean velocities of 10,000 km s–1. Our light curve modeling suggests a radioactivity-powered event and an ejecta mass of 0.16 M sun. If powered by Nickel, we show that the Nickel mass must be very small (≈0.02 M sun) and that the supernova quickly becomes optically thin to γ-rays. Our spectral modeling suggests that SN 2010X and SN 2002bj have similar chemical compositions and that one of aluminum or helium is present. If aluminum is present, we speculate that this may be an accretion-induced collapse of an O-Ne-Mg white dwarf. If helium is present, all observables of SN 2010X are consistent with being a thermonuclear helium shell detonation on a white dwarf, a ".Ia" explosion. With the 1 day dynamic-cadence experiment on the Palomar Transient Factory, we expect to annually discover a few such events.

Item ID: 17309
Item Type: Article (Research - C1)
ISSN: 2041-8213
Keywords: supernovae: general; supernovae: individual (SN2010X, SN2002bj); surveys; white dwarfs
Date Deposited: 30 May 2011 03:59
FoR Codes: 02 PHYSICAL SCIENCES > 0201 Astronomical and Space Sciences > 020110 Stellar Astronomy and Planetary Systems @ 100%
SEO Codes: 97 EXPANDING KNOWLEDGE > 970102 Expanding Knowledge in the Physical Sciences @ 100%
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