From shock breakout to peak and beyond: Extensive panchromatic observations of the type Ib supernova 2008D associated with swift x-ray transient 080109

M. Modjaz, W. Li, N. Butler, R. Chornock, D. Perley, S. Blondin, J. S. Bloom, A. V. Filippenko, R. P. Kirshner, D. Kocevski, D. Poznanski, M. Hicken, R. J. Foley, G. S. Stringfellow, P. Berlind, D. Barrado Y Navascues, C. H. Blake, H. Bouy, W. R. Brown, P. ChallisH. Chen, W. H. De Vries, P. Dufour, E. Falco, A. Friedman, M. Ganeshalingam, P. Garnavich, B. Holden, G. Illingworth, N. Lee, J. Liebert, G. H. Marion, S. S. Olivier, J. X. Prochaska, J. M. Silverman, N. Smith, D. Starr, T. N. Steele, A. Stockton, G. G. Williams, W. M. Wood-Vasey

Research output: Contribution to journalArticle

166 Scopus citations

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 150days 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 18days and a modest optical peak luminosity. The early-time light curves of the SN are dominated by a cooling stellar envelope (for Δt0.1-4days, most pronounced in the blue bands) followed by 56Ni 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 of its probable Wolf-Rayet progenitor. According to the model of Waxman etal. and Chevalier & Fransson, we derive R W07 = 1.2 0.7R and R CF08 = 12 7 R , 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.

Original languageEnglish (US)
Pages (from-to)226-248
Number of pages23
JournalAstrophysical Journal
Volume702
Issue number1
DOIs
StatePublished - 2009

Keywords

  • Distances and redshifts
  • Galaxies
  • General
  • Individual
  • Individual (NGC 2770)
  • Supernovae

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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    Modjaz, M., Li, W., Butler, N., Chornock, R., Perley, D., Blondin, S., Bloom, J. S., Filippenko, A. V., Kirshner, R. P., Kocevski, D., Poznanski, D., Hicken, M., Foley, R. J., Stringfellow, G. S., Berlind, P., Barrado Y Navascues, D., Blake, C. H., Bouy, H., Brown, W. R., ... Wood-Vasey, W. M. (2009). From shock breakout to peak and beyond: Extensive panchromatic observations of the type Ib supernova 2008D associated with swift x-ray transient 080109. Astrophysical Journal, 702(1), 226-248. https://doi.org/10.1088/0004-637X/702/1/226