A non-spherical core in the explosion of supernova SN 2004dj

Douglas C. Leonard, Alexei V. Filippenko, Mohan Ganeshalingam, Franklin J.D. Serduke, Weidong Li, Brandon J. Swift, Avishay Gal-Yam, Ryan J. Foley, Derek B. Fox, Sung Park, Jennifer L. Hoffman, Diane S. Wong

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129 Scopus citations

Abstract

An important and perhaps critical clue to the mechanism driving the explosion of massive stars as supernovae is provided by the accumulating evidence for asymmetry in the explosion. Indirect evidence comes from high pulsar velocities1, associations of supernovae with long-soft γ-ray bursts2,3, and asymmetries in late-time emission-line profiles4. Spectropolarimetry provides a direct probe of young supernova geometry, with higher polarization generally indicating a greater departure from spherical symmetry5,6. Large polarizations have been measured for 'stripped-envelope' (that is, type Ic; ref. 7) supernovae, which confirms their non-spherical morphology8,9; but the explosions of massive stars with intact hydrogen envelopes7,10 (type II-P supernovae) have shown only weak polarizations at the early times observed 11,12. Here we report multi-epoch spectropolarimetry of a classic type II-P supernova that reveals the abrupt appearance of significant polarization when the inner core is first exposed in the thinning ejecta (∼90 days after explosion). We infer a departure from spherical symmetry of at least 30 per cent for the inner ejecta. Combined with earlier results, this suggests that a strongly non-spherical explosion may be a generic feature of core-collapse supernovae of all types, where the asphericity in type H-P supernovae is cloaked at early times by the massive, opaque, hydrogen envelope.

Original languageEnglish (US)
Pages (from-to)505-507
Number of pages3
JournalNature
Volume440
Issue number7083
DOIs
StatePublished - Mar 23 2006

All Science Journal Classification (ASJC) codes

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    Leonard, D. C., Filippenko, A. V., Ganeshalingam, M., Serduke, F. J. D., Li, W., Swift, B. J., Gal-Yam, A., Foley, R. J., Fox, D. B., Park, S., Hoffman, J. L., & Wong, D. S. (2006). A non-spherical core in the explosion of supernova SN 2004dj. Nature, 440(7083), 505-507. https://doi.org/10.1038/nature04558