%0 Generic %1 yaron2017confined %A Yaron, O. %A Perley, D. A. %A Gal-Yam, A. %A Groh, J. H. %A Horesh, A. %A Ofek, E. O. %A Kulkarni, S. R. %A Sollerman, J. %A Fransson, C. %A Rubin, A. %A Szabo, P. %A Sapir, N. %A Taddia, F. %A Cenko, S. B. %A Valenti, S. %A Arcavi, I. %A Howell, D. A. %A Kasliwal, M. M. %A Vreeswijk, P. M. %A Khazov, D. %A Fox, O. D. %A Cao, Y. %A Gnat, O. %A Kelly, P. L. %A Nugent, P. E. %A Filippenko, A. V. %A Laher, R. R. %A Wozniak, P. R. %A Lee, W. H. %A Rebbapragada, U. D. %A Maguire, K. %A Sullivan, M. %A Soumagnac, M. T. %D 2017 %K CSM IIP interaction supernovae %R 10.1038/nphys4025 %T Confined Dense Circumstellar Material Surrounding a Regular Type II Supernova: The Unique Flash-Spectroscopy Event of SN 2013fs %U http://arxiv.org/abs/1701.02596 %X With the advent of new wide-field, high-cadence optical transient surveys, our understanding of the diversity of core-collapse supernovae has grown tremendously in the last decade. However, the pre-supernova evolution of massive stars, that sets the physical backdrop to these violent events, is theoretically not well understood and difficult to probe observationally. Here we report the discovery of the supernova iPTF13dqy = SN 2013fs, a mere ~3 hr after explosion. Our rapid follow-up observations, which include multiwavelength photometry and extremely early (beginning at ~6 hr post-explosion) spectra, map the distribution of material in the immediate environment (<~ 10^15 cm) of the exploding star and establish that it was surrounded by circumstellar material (CSM) that was ejected during the final ~1 yr prior to explosion at a high rate, around 10^-3 solar masses per year. The complete disappearance of flash-ionised emission lines within the first several days requires that the dense CSM be confined to within <~ 10^15 cm, consistent with radio non-detections at 70--100 days. The observations indicate that iPTF13dqy was a regular Type II SN; thus, the finding that the probable red supergiant (RSG) progenitor of this common explosion ejected material at a highly elevated rate just prior to its demise suggests that pre-supernova instabilities may be common among exploding massive stars.

@misc{yaron2017confined, abstract = {With the advent of new wide-field, high-cadence optical transient surveys, our understanding of the diversity of core-collapse supernovae has grown tremendously in the last decade. However, the pre-supernova evolution of massive stars, that sets the physical backdrop to these violent events, is theoretically not well understood and difficult to probe observationally. Here we report the discovery of the supernova iPTF13dqy = SN 2013fs, a mere ~3 hr after explosion. Our rapid follow-up observations, which include multiwavelength photometry and extremely early (beginning at ~6 hr post-explosion) spectra, map the distribution of material in the immediate environment (<~ 10^15 cm) of the exploding star and establish that it was surrounded by circumstellar material (CSM) that was ejected during the final ~1 yr prior to explosion at a high rate, around 10^-3 solar masses per year. The complete disappearance of flash-ionised emission lines within the first several days requires that the dense CSM be confined to within <~ 10^15 cm, consistent with radio non-detections at 70--100 days. The observations indicate that iPTF13dqy was a regular Type II SN; thus, the finding that the probable red supergiant (RSG) progenitor of this common explosion ejected material at a highly elevated rate just prior to its demise suggests that pre-supernova instabilities may be common among exploding massive stars.}, added-at = {2022-06-15T10:56:51.000+0200}, author = {Yaron, O. and Perley, D. A. and Gal-Yam, A. and Groh, J. H. and Horesh, A. and Ofek, E. O. and Kulkarni, S. R. and Sollerman, J. and Fransson, C. and Rubin, A. and Szabo, P. and Sapir, N. and Taddia, F. and Cenko, S. B. and Valenti, S. and Arcavi, I. and Howell, D. A. and Kasliwal, M. M. and Vreeswijk, P. M. and Khazov, D. and Fox, O. D. and Cao, Y. and Gnat, O. and Kelly, P. L. and Nugent, P. E. and Filippenko, A. V. and Laher, R. R. and Wozniak, P. R. and Lee, W. H. and Rebbapragada, U. D. and Maguire, K. and Sullivan, M. and Soumagnac, M. T.}, biburl = {https://www.bibsonomy.org/bibtex/28fdc6865358b376d079220920306ba1a/jnecker}, description = {[1701.02596] Confined Dense Circumstellar Material Surrounding a Regular Type II Supernova: The Unique Flash-Spectroscopy Event of SN 2013fs}, doi = {10.1038/nphys4025}, interhash = {611bb5faa00cb5e3c03d1a98447839f1}, intrahash = {8fdc6865358b376d079220920306ba1a}, keywords = {CSM IIP interaction supernovae}, note = {cite arxiv:1701.02596Comment: Published in Nature Phys., including methods and SI}, timestamp = {2022-06-15T10:56:51.000+0200}, title = {Confined Dense Circumstellar Material Surrounding a Regular Type II Supernova: The Unique Flash-Spectroscopy Event of SN 2013fs}, url = {http://arxiv.org/abs/1701.02596}, year = 2017 }