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SN 2010ay is a Luminous and Broad-lined Type Ic Supernova within a Low-metallicity Host GalaxyWe report on our serendipitous pre-discovery detection and detailed follow-up of the broad-lined Type Ic supernova SN2010ay at z approx 0.067 imaged by the Pan-STARRS1 3pi survey just approx 4 days after explosion. Combining our photometric observations with those available in the literature, we estimate the explosion date and the peak luminosity of the SN, M(sub R) approximately equals 20.2 mag, significantly brighter than known GRB-SNe and one of the most luminous SNe Ibc ever discovered. We measure the photospheric expansion velocity of the explosion from our spectroscopic follow-up observations, v(sub ph) approximately equals 19.2 X 10 (exp 3) km/s at approx 40 days after explosion. In comparison with other broad-lined SNe, the characteristic velocity of SN2010ay is 2 - 5 X higher and similar to the measurements for GRB-SNe at comparable epochs. Moreover the velocity declines two times slower than other SNe Ic-BL and GRB-SNe. Assuming that the optical emission is powered by radioactive decay, the peak magnitude implies the synthesis of an unusually large mass of Ni-56, M(sub Ni) = 0.9(+0.1/-0.1) solar mass. Our modeling of the light-curve points to a total ejecta mass, M(sub ej) approx 4.7 Solar Mass, and total kinetic energy, E(sub K,51) approximately equals 11. Thus the ratio of M(sub Ni) to M(sub ej) is at least twice as large for SN2010ay than in GRB-SNe and may indicate an additional energy reservoir. We also measure the metallicity (log(O/H) + 12 = 8.19) of the explosion site within the host galaxy using a high S/N optical spectrum. Our abundance measurement places this SN in the low-metallicity regime populated by GRB-SNe, and approx 0.2(0.5) dex lower than that typically measured for the host environments of normal (broad-lined) Ic supernovae. Despite striking similarities to the recent GRB-SN100316D/2010bh, we show that gamma-ray observations rule out an associated GRB with E(sub gamma) approx < 6 X 10(exp 48) erg (25-150 keV). Similarly, our deep radio follow-up observations with the Expanded Very Large Array rule out relativistic ejecta with energy, E approx > 10(exp 48) erg. These observations challenge the importance of progenitor metallicity for the production of a GRB, and suggest that other parameters also play a key role.
Document ID
20120008468
Acquisition Source
Goddard Space Flight Center
Document Type
Preprint (Draft being sent to journal)
Authors
Sanders, N. E. (Harvard-Smithsonian Center for Astrophysics Cambridge, MA, United States)
Soderberg, A. M. (Harvard-Smithsonian Center for Astrophysics Cambridge, MA, United States)
Valenti, S. (Queens Univ. Belfast, United Kingdom)
Chomiuk, L. (Harvard-Smithsonian Center for Astrophysics Cambridge, MA, United States)
Berger, E. (Harvard-Smithsonian Center for Astrophysics Cambridge, MA, United States)
Smartt, S. (Queens Univ. Belfast, United Kingdom)
Hurley, K. (California Univ. Berkeley, CA, United States)
Barthelmy, S. D. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Chornock, R. (Harvard-Smithsonian Center for Astrophysics Cambridge, MA, United States)
Foley, R. J. (Harvard-Smithsonian Center for Astrophysics Cambridge, MA, United States)
Levesque, E. M. (Colorado Univ. Boulder, CO, United States)
Narayan, G. (Harvard Univ. Cambridge, MA, United States)
Botticella, M. T. (Queens Univ. Belfast, United Kingdom)
Briggs, M. S. (Alabama Univ. Huntsville, AL, United States)
Connaughton, V. (Alabama Univ. Huntsville, AL, United States)
Terada, Y. (Saitama Univ. Saitama, Japan)
Gehrels, N. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Golenetskii, S. (Ioffe (A. F.) Physical-Technical Inst. Saint Petersburg, Russian Federation)
Mazets, E. (Ioffe (A. F.) Physical-Technical Inst. Saint Petersburg, Russian Federation)
Cline, T. (NASA Goddard Space Flight Center Greenbelt, MD, United States)
von Kienlin, A. (Max-Planck-Inst. fuer Extraterrestrische Physik Garching, Germany)
Boynton, W. (Arizona Univ. Tucson, AZ, United States)
Chambers, K. C. (Hawaii Univ. Honolulu, HI, United States)
Grav, T. (Johns Hopkins Univ. Baltimore, MD, United States)
Heasley, J. N. (Hawaii Univ. Honolulu, HI, United States)
Date Acquired
August 25, 2013
Publication Date
January 1, 2011
Subject Category
Astronomy
Report/Patent Number
GSFC.JA.5904.2012
Funding Number(s)
CONTRACT_GRANT: NNX07AR71G
CONTRACT_GRANT: NNX09AR28G
CONTRACT_GRANT: RFBR-09-02-00166a
CONTRACT_GRANT: NNX09AO97G
CONTRACT_GRANT: NNX08AN23G
CONTRACT_GRANT: NNX08AX95G
CONTRACT_GRANT: NNX09AU03G
Distribution Limits
Public
Copyright
Public Use Permitted.

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