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We present extensive early photometric (ultraviolet through near-infrared)and spectroscopic (optical and near-infrared) data on supernova (SN) 2008D aswell as X-ray data analysis on the associated Swift/X-ray transient (XRT)080109. Our data span a time range of 5 hours before the detection of the X-raytransient to 150 days after its detection, and detailed analysis allowed us toderive constraints on the nature of the SN and its progenitor; throughout wedraw comparisons with results presented in the literature and find several keyaspects that differ. We show that the X-ray spectrum of XRT 080109 can be fitequally well by an absorbed power law or a superposition of about equal partsof both power law and blackbody. Our data first established that SN 2008D is aspectroscopically normal SN Ib (i.e., showing conspicuous He lines), and showthat SN 2008D had a relatively long rise time of 18 days and a modest opticalpeak luminosity. The early-time light curves of the SN are dominated by acooling stellar envelope (for \Delta t~0.1- 4 day, most pronounced in the bluebands) followed by 56^Ni decay. We construct a reliable measurement of thebolometric output for this stripped-envelope SN, and, combined with estimatesof E_K and M_ej from the literature, estimate the stellar radius R_star of itsprobable Wolf-Rayet progenitor. According to the model of Waxman et al. and ofChevalier & Fransson, we derive R_star^{W07}= 1.2+/-0.7 R_sun andR_star^{CF08}= 12+/-7 R_sun, respectively; the latter being more in line withtypical WN stars. Spectra obtained at 3 and 4 months after maximum light showdouble-peaked oxygen lines that we associate with departures from sphericalsymmetry, as has been suggested for the inner ejecta of a number of SN Ibcores.

astrophysical journal/the astrophysical journal

From Shock Breakout to Peak and Beyond: Extensive Panchromatic  Observations of the Type Ib Supernova 2008D associated with Swift X-ray  Transient 080109