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    From Shock Breakout To Peak And Beyond: Extensive Panchromatic Observations Of The Type Ib Supernova 2008D Associated With Swift X-Ray Transient 080109

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    2009_09_shockbreakout.pdf (1.783Mb)
    Date
    2009-09
    Author
    Modjaz, M.
    Li, W.
    Butler, N.
    Chornock, Ryan
    Perley, D.
    Blondin, S.
    Bloom, Joshua S.
    Filippenko, Alexei V.
    Kirshner, Robert P.
    Kocevski, D.
    Poznanski, D.
    Hicken, M.
    Foley, Ryan J.
    Stringfellow, Guy S.
    Berlind, Perry
    Navascues, D. B. Y.
    Blake, C. H.
    Bouy, H.
    Brown, Warren R.
    Challis, Peter
    Chen, H.
    de Vries, W. H.
    Dufour, Patrick
    Falco, E.
    Friedman, A.
    Ganeshalingam, Mohan
    Garnavich, Peter
    Holden, B.
    Illingworth, G.
    Lee, N.
    Liebert, James
    Marion, G. H.
    Olivier, S. S.
    Prochaska, J. X.
    Silverman, Jeffrey M.
    Smith, N.
    Starr, D.
    Steele, Thea N.
    Stockton, A.
    Williams, G. G.
    Wood-Vasey, W. M.
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    Abstract
    We present extensive early photometric (ultraviolet through near-infrared) and spectroscopic (optical and near-infrared) data on supernova (SN) 2008D as well as X-ray data analysis on the associated Swift X-ray transient (XRT) 080109. Our data span a time range of 5 hr before the detection of the X-ray transient to 150 days after its detection, and a detailed analysis allowed us to derive constraints on the nature of the SN and its progenitor; throughout we draw comparisons with results presented in the literature and find several key aspects that differ. We show that the X-ray spectrum of XRT 080109 can be fit equally well by an absorbed power law or a superposition of about equal parts of both power law and blackbody. Our data first established that SN 2008D is a spectroscopically normal SN Ib (i.e., showing conspicuous He lines) and showed that SN 2008D had a relatively long rise time of 18 days and a modest optical peak luminosity. The early-time light curves of the SN are dominated by a cooling stellar envelope (for Delta t approximate to 0.1-4 days, most pronounced in the blue bands) followed by (56)Ni decay. We construct a reliable measurement of the bolometric output for this stripped-envelope SN, and, combined with estimates of E(K) and M(ej) from the literature, estimate the stellar radius R(star) of its probable Wolf-Rayet progenitor. According to the model of Waxman et al. and Chevalier & Fransson, we derive R(star)(W07) = 1.2 +/- 0.7 R(circle dot) and R(star)(CF08) = 12 +/- 7 R(circle dot), respectively; the latter being more in line with typical WN stars. Spectra obtained at three and four months after maximum light show double-peaked oxygen lines that we associate with departures from spherical symmetry, as has been suggested for the inner ejecta of a number of SN Ib cores.
    Department
    Astronomy
    Subject
    galaxies: distances and redshifts
    galaxies: individual (ngc 2770)
    supernovae: general
    supernovae: individual (sn 2008d)
    core-collapse supernova
    neutron-star kicks
    light curves
    ia
    supernovae
    ic supernovae
    massive stars
    optical spectroscopy
    image
    subtraction
    ubvri photometry
    burst connection
    astronomy & astrophysics
    URI
    http://hdl.handle.net/2152/34992
    Citation
    Modjaz, Maryam, W. Li, N. Butler, R. Chornock, D. Perley, S. Blondin, J. S. Bloom et al. "From shock breakout to peak and beyond: extensive panchromatic observations of the type Ib supernova 2008D associated with swift X-ray transient 080109." The Astrophysical Journal, Vol. 702, No. 1 (Sep., 2009): 226.
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