The fast and furious decay of the peculiar type Ic supernova 2005ek

M. R. Drout, A. M. Soderberg, P. A. Mazzali, J. T. Parrent, R. Margutti, D. Milisavljevic, N. E. Sanders, R. Chornock, R. J. Foley, R. P. Kirshner, A. V. Filippenko, W. Li, P. J. Brown, S. B. Cenko, S. Chakraborti, P. Challis, A. Friedman, M. Ganeshalingam, M. Hicken, C. JensenM. Modjaz, H. B. Perets, J. M. Silverman, D. S. Wong

    Research output: Contribution to journalArticle

    Abstract

    We present extensive multi-wavelength observations of the extremely rapidly declining Type Ic supernova (SN Ic), SN 2005ek. Reaching a peak magnitude of MR = -17.3 and decaying by ∼3 mag in the first 15 days post-maximum, SN 2005ek is among the fastest Type I supernovae observed to date. The spectra of SN 2005ek closely resemble those of normal SN Ic, but with an accelerated evolution. There is evidence for the onset of nebular features at only nine days post-maximum. Spectroscopic modeling reveals an ejecta mass of ∼0.3 MȮ that is dominated by oxygen (∼80%), while the pseudo-bolometric light curve is consistent with an explosion powered by ∼0.03 MȮ of radioactive 56Ni. Although previous rapidly evolving events (e.g., SN 1885A, SN 1939B, SN 2002bj, SN 2010X) were hypothesized to be produced by the detonation of a helium shell on a white dwarf, oxygen-dominated ejecta are difficult to reconcile with this proposed mechanism. We find that the properties of SN 2005ek are consistent with either the edge-lit double detonation of a low-mass white dwarf or the iron-core collapse of a massive star, stripped by binary interaction. However, if we assume that the strong spectroscopic similarity of SN 2005ek to other SNe Ic is an indication of a similar progenitor channel, then a white-dwarf progenitor becomes very improbable. SN 2005ek may be one of the lowest mass stripped-envelope core-collapse explosions ever observed. We find that the rate of such rapidly declining Type I events is at least 1%-3% of the normal SN Ia rate.

    Original languageEnglish (US)
    Article number58
    JournalAstrophysical Journal
    Volume774
    Issue number1
    DOIs
    StatePublished - Sep 1 2013

    Fingerprint

    supernovae
    ejecta
    detonation
    explosions
    explosion
    decay
    oxygen
    massive stars
    helium
    light curve
    indication
    envelopes
    shell
    wavelength
    iron
    wavelengths
    modeling
    interactions
    rate

    Keywords

    • supernovae: general
    • supernovae: individual (SN2005ek)

    ASJC Scopus subject areas

    • Space and Planetary Science
    • Astronomy and Astrophysics

    Cite this

    Drout, M. R., Soderberg, A. M., Mazzali, P. A., Parrent, J. T., Margutti, R., Milisavljevic, D., ... Wong, D. S. (2013). The fast and furious decay of the peculiar type Ic supernova 2005ek. Astrophysical Journal, 774(1), [58]. https://doi.org/10.1088/0004-637X/774/1/58

    The fast and furious decay of the peculiar type Ic supernova 2005ek. / Drout, M. R.; Soderberg, A. M.; Mazzali, P. A.; Parrent, J. T.; Margutti, R.; Milisavljevic, D.; Sanders, N. E.; Chornock, R.; Foley, R. J.; Kirshner, R. P.; Filippenko, A. V.; Li, W.; Brown, P. J.; Cenko, S. B.; Chakraborti, S.; Challis, P.; Friedman, A.; Ganeshalingam, M.; Hicken, M.; Jensen, C.; Modjaz, M.; Perets, H. B.; Silverman, J. M.; Wong, D. S.

    In: Astrophysical Journal, Vol. 774, No. 1, 58, 01.09.2013.

    Research output: Contribution to journalArticle

    Drout, MR, Soderberg, AM, Mazzali, PA, Parrent, JT, Margutti, R, Milisavljevic, D, Sanders, NE, Chornock, R, Foley, RJ, Kirshner, RP, Filippenko, AV, Li, W, Brown, PJ, Cenko, SB, Chakraborti, S, Challis, P, Friedman, A, Ganeshalingam, M, Hicken, M, Jensen, C, Modjaz, M, Perets, HB, Silverman, JM & Wong, DS 2013, 'The fast and furious decay of the peculiar type Ic supernova 2005ek', Astrophysical Journal, vol. 774, no. 1, 58. https://doi.org/10.1088/0004-637X/774/1/58
    Drout MR, Soderberg AM, Mazzali PA, Parrent JT, Margutti R, Milisavljevic D et al. The fast and furious decay of the peculiar type Ic supernova 2005ek. Astrophysical Journal. 2013 Sep 1;774(1). 58. https://doi.org/10.1088/0004-637X/774/1/58
    Drout, M. R. ; Soderberg, A. M. ; Mazzali, P. A. ; Parrent, J. T. ; Margutti, R. ; Milisavljevic, D. ; Sanders, N. E. ; Chornock, R. ; Foley, R. J. ; Kirshner, R. P. ; Filippenko, A. V. ; Li, W. ; Brown, P. J. ; Cenko, S. B. ; Chakraborti, S. ; Challis, P. ; Friedman, A. ; Ganeshalingam, M. ; Hicken, M. ; Jensen, C. ; Modjaz, M. ; Perets, H. B. ; Silverman, J. M. ; Wong, D. S. / The fast and furious decay of the peculiar type Ic supernova 2005ek. In: Astrophysical Journal. 2013 ; Vol. 774, No. 1.
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    AU - Drout, M. R.

    AU - Soderberg, A. M.

    AU - Mazzali, P. A.

    AU - Parrent, J. T.

    AU - Margutti, R.

    AU - Milisavljevic, D.

    AU - Sanders, N. E.

    AU - Chornock, R.

    AU - Foley, R. J.

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    AU - Brown, P. J.

    AU - Cenko, S. B.

    AU - Chakraborti, S.

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    AU - Friedman, A.

    AU - Ganeshalingam, M.

    AU - Hicken, M.

    AU - Jensen, C.

    AU - Modjaz, M.

    AU - Perets, H. B.

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