A sample of Type II-L supernovae

T. Faran, D. Poznanski, A. V. Filippenko, R. Chornock, R. J. Foley, M. Ganeshalingam, D. C. Leonard, W. Li, M. Modjaz, F. J D Serduke, J. M. Silverman

    Research output: Contribution to journalArticle

    Abstract

    What are Type II-Linear supernovae (SNe II-L)? This class, which has been ill defined for decades, now receives significant attention - both theoretically, in order to understand what happens to stars in the ~15-25 M range, and observationally, with two independent studies suggesting that they cannot be cleanly separated photometrically from the regular hydrogenrich SNe II-P characterized by a marked plateau in their light curve. Here, we analyse the multiband light curves and extensive spectroscopic coverage of a sample of 35 SNe II and find that 11 of them could be SNe II-L. The spectra of these SNe are hydrogen deficient, typically have shallow Hα absorption, may show indirect signs of helium via strong O I λ7774 absorption, and have faster line velocities consistent with a thin hydrogen shell. The light curves can be mostly differentiated from those of the regular, hydrogen-rich SNe II-P by their steeper decline rates and higher luminosity, and we propose to define them based on their decline in the V band: SNe II-L decline by more than 0.5 mag from peak brightness by day 50 after explosion. Using our sample we provide template light curves for SNe II-L and II-P in four photometric bands.

    Original languageEnglish (US)
    Pages (from-to)554-569
    Number of pages16
    JournalMonthly Notices of the Royal Astronomical Society
    Volume445
    Issue number1
    DOIs
    StatePublished - Oct 8 2014

    Fingerprint

    light curve
    supernovae
    hydrogen
    extremely high frequencies
    helium
    explosions
    explosion
    plateaus
    brightness
    templates
    luminosity
    plateau
    shell
    stars

    Keywords

    • General
    • Supernovae

    ASJC Scopus subject areas

    • Space and Planetary Science
    • Astronomy and Astrophysics

    Cite this

    Faran, T., Poznanski, D., Filippenko, A. V., Chornock, R., Foley, R. J., Ganeshalingam, M., ... Silverman, J. M. (2014). A sample of Type II-L supernovae. Monthly Notices of the Royal Astronomical Society, 445(1), 554-569. https://doi.org/10.1093/mnras/stu1760

    A sample of Type II-L supernovae. / Faran, T.; Poznanski, D.; Filippenko, A. V.; Chornock, R.; Foley, R. J.; Ganeshalingam, M.; Leonard, D. C.; Li, W.; Modjaz, M.; Serduke, F. J D; Silverman, J. M.

    In: Monthly Notices of the Royal Astronomical Society, Vol. 445, No. 1, 08.10.2014, p. 554-569.

    Research output: Contribution to journalArticle

    Faran, T, Poznanski, D, Filippenko, AV, Chornock, R, Foley, RJ, Ganeshalingam, M, Leonard, DC, Li, W, Modjaz, M, Serduke, FJD & Silverman, JM 2014, 'A sample of Type II-L supernovae', Monthly Notices of the Royal Astronomical Society, vol. 445, no. 1, pp. 554-569. https://doi.org/10.1093/mnras/stu1760
    Faran T, Poznanski D, Filippenko AV, Chornock R, Foley RJ, Ganeshalingam M et al. A sample of Type II-L supernovae. Monthly Notices of the Royal Astronomical Society. 2014 Oct 8;445(1):554-569. https://doi.org/10.1093/mnras/stu1760
    Faran, T. ; Poznanski, D. ; Filippenko, A. V. ; Chornock, R. ; Foley, R. J. ; Ganeshalingam, M. ; Leonard, D. C. ; Li, W. ; Modjaz, M. ; Serduke, F. J D ; Silverman, J. M. / A sample of Type II-L supernovae. In: Monthly Notices of the Royal Astronomical Society. 2014 ; Vol. 445, No. 1. pp. 554-569.
    @article{0212c5510d1740d19cd81d9474ac72be,
    title = "A sample of Type II-L supernovae",
    abstract = "What are Type II-Linear supernovae (SNe II-L)? This class, which has been ill defined for decades, now receives significant attention - both theoretically, in order to understand what happens to stars in the ~15-25 M range, and observationally, with two independent studies suggesting that they cannot be cleanly separated photometrically from the regular hydrogenrich SNe II-P characterized by a marked plateau in their light curve. Here, we analyse the multiband light curves and extensive spectroscopic coverage of a sample of 35 SNe II and find that 11 of them could be SNe II-L. The spectra of these SNe are hydrogen deficient, typically have shallow Hα absorption, may show indirect signs of helium via strong O I λ7774 absorption, and have faster line velocities consistent with a thin hydrogen shell. The light curves can be mostly differentiated from those of the regular, hydrogen-rich SNe II-P by their steeper decline rates and higher luminosity, and we propose to define them based on their decline in the V band: SNe II-L decline by more than 0.5 mag from peak brightness by day 50 after explosion. Using our sample we provide template light curves for SNe II-L and II-P in four photometric bands.",
    keywords = "General, Supernovae",
    author = "T. Faran and D. Poznanski and Filippenko, {A. V.} and R. Chornock and Foley, {R. J.} and M. Ganeshalingam and Leonard, {D. C.} and W. Li and M. Modjaz and Serduke, {F. J D} and Silverman, {J. M.}",
    year = "2014",
    month = "10",
    day = "8",
    doi = "10.1093/mnras/stu1760",
    language = "English (US)",
    volume = "445",
    pages = "554--569",
    journal = "Monthly Notices of the Royal Astronomical Society",
    issn = "0035-8711",
    publisher = "Oxford University Press",
    number = "1",

    }

    TY - JOUR

    T1 - A sample of Type II-L supernovae

    AU - Faran, T.

    AU - Poznanski, D.

    AU - Filippenko, A. V.

    AU - Chornock, R.

    AU - Foley, R. J.

    AU - Ganeshalingam, M.

    AU - Leonard, D. C.

    AU - Li, W.

    AU - Modjaz, M.

    AU - Serduke, F. J D

    AU - Silverman, J. M.

    PY - 2014/10/8

    Y1 - 2014/10/8

    N2 - What are Type II-Linear supernovae (SNe II-L)? This class, which has been ill defined for decades, now receives significant attention - both theoretically, in order to understand what happens to stars in the ~15-25 M range, and observationally, with two independent studies suggesting that they cannot be cleanly separated photometrically from the regular hydrogenrich SNe II-P characterized by a marked plateau in their light curve. Here, we analyse the multiband light curves and extensive spectroscopic coverage of a sample of 35 SNe II and find that 11 of them could be SNe II-L. The spectra of these SNe are hydrogen deficient, typically have shallow Hα absorption, may show indirect signs of helium via strong O I λ7774 absorption, and have faster line velocities consistent with a thin hydrogen shell. The light curves can be mostly differentiated from those of the regular, hydrogen-rich SNe II-P by their steeper decline rates and higher luminosity, and we propose to define them based on their decline in the V band: SNe II-L decline by more than 0.5 mag from peak brightness by day 50 after explosion. Using our sample we provide template light curves for SNe II-L and II-P in four photometric bands.

    AB - What are Type II-Linear supernovae (SNe II-L)? This class, which has been ill defined for decades, now receives significant attention - both theoretically, in order to understand what happens to stars in the ~15-25 M range, and observationally, with two independent studies suggesting that they cannot be cleanly separated photometrically from the regular hydrogenrich SNe II-P characterized by a marked plateau in their light curve. Here, we analyse the multiband light curves and extensive spectroscopic coverage of a sample of 35 SNe II and find that 11 of them could be SNe II-L. The spectra of these SNe are hydrogen deficient, typically have shallow Hα absorption, may show indirect signs of helium via strong O I λ7774 absorption, and have faster line velocities consistent with a thin hydrogen shell. The light curves can be mostly differentiated from those of the regular, hydrogen-rich SNe II-P by their steeper decline rates and higher luminosity, and we propose to define them based on their decline in the V band: SNe II-L decline by more than 0.5 mag from peak brightness by day 50 after explosion. Using our sample we provide template light curves for SNe II-L and II-P in four photometric bands.

    KW - General

    KW - Supernovae

    UR - http://www.scopus.com/inward/record.url?scp=84913610331&partnerID=8YFLogxK

    UR - http://www.scopus.com/inward/citedby.url?scp=84913610331&partnerID=8YFLogxK

    U2 - 10.1093/mnras/stu1760

    DO - 10.1093/mnras/stu1760

    M3 - Article

    VL - 445

    SP - 554

    EP - 569

    JO - Monthly Notices of the Royal Astronomical Society

    JF - Monthly Notices of the Royal Astronomical Society

    SN - 0035-8711

    IS - 1

    ER -