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Selecting superluminous supernovae in faint galaxies from the first year of the Pan-STARRS1 Medium Deep Survey.

McCrum, M. and Smartt, S. J. and Rest, A. and Smith, K. and Kotak, R. and Rodney, S. A. and Young, D. R. and Chornock, R. and Berger, E. and Foley, R. J. and Fraser, M. and Wright, D. and Scolnic, D. and Tonry, J. L. and Urata, Y. and Huang, K. and Pastorello, A. and Botticella, M. T. and Valenti, S. and Mattila, S. and Kankare, E. and Farrow, D. J. and Huber, M. E. and Stubbs, C. W. and Kirshner, R. P. and Bresolin, F. and Burgett, W. S. and Chambers, K. C. and Draper, P. W. and Flewelling, H. and Jedicke, R. and Kaiser, N. and Magnier, E. A. and Metcalfe, N. and Morgan, J. S. and Price, P. A. and Sweeney, W. and Wainscoat, R. J. and Waters, C. (2015) 'Selecting superluminous supernovae in faint galaxies from the first year of the Pan-STARRS1 Medium Deep Survey.', Monthly notices of the Royal Astronomical Society., 448 (2). pp. 1206-1231.


The Pan-STARRS1 (PS1) survey has obtained imaging in five bands (griz yP1) over 10 Medium Deep Survey (MDS) fields covering a total of 70 square degrees. This paper describes the search for apparently hostless supernovae (SNe) within the first year of PS1 MDS data with an aim of discovering superluminous supernovae (SLSNe). A total of 249 hostless transients were discovered down to a limiting magnitude of MAB ∼ 23.5, of which 76 were classified as Type Ia supernovae (SNe Ia). There were 57 SNe with complete light curves that are likely core-collapse SNe (CCSNe) or type Ic SLSNe and 12 of these have had spectra taken. Of these 12 hostless, non-Type Ia SNe, 7 were SLSNe of type Ic at redshifts between 0.5 and 1.4. This illustrates that the discovery rate of type Ic SLSNe can be maximized by concentrating on hostless transients and removing normal SNe Ia. We present data for two possible SLSNe; PS1-10pm (z = 1.206) and PS1-10ahf (z = 1.1), and estimate the rate of type Ic SLSNe to be between 3+3−2×10−5 and 8+2−1×10−5 that of the CCSN rate within 0.3 ≤ z ≤ 1.4 by applying a Monte Carlo technique. The rate of slowly evolving, type Ic SLSNe (such as SN2007bi) is estimated as a factor of 10 lower than this range.

Item Type:Article
Keywords:Supernovae: general, Supernovae: individual: PS1-10pm, Supernovae: individual: PS1-10ahf.
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Publisher statement:This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2015 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Date accepted:06 January 2015
Date deposited:03 September 2015
Date of first online publication:April 2015
Date first made open access:No date available

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