ANALYSIS OF THE EARLY-TIME OPTICAL SPECTRA OF SN 2011fe IN M101
Jerod T. Parrent,Jerod T. Parrent,D. A. Howell,D. A. Howell,Brian Friesen,R. C. Thomas,Robert A. Fesen,Dan Milisavljevic,Federica B. Bianco,Federica B. Bianco,Ben Dilday,Ben Dilday,Peter Nugent,Peter Nugent,E. Baron,E. Baron,Iair Arcavi,Sagi Ben-Ami,D. Bersier,Lars Bildsten,Josh Bloom,Yi Cao,S. B. Cenko,Alexei V. Filippenko,Avishay Gal-Yam,Mansi M. Kasliwal,Nick P. Konidaris,Shrinivas R. Kulkarni,Nicholas M. Law,David Levitan,Kate Maguire,Paolo A. Mazzali,Eran O. Ofek,Yen-Chen Pan,David Polishook,Dovi Poznanski,Robert M. Quimby,J. M. Silverman,Assaf Sternberg,Mark Sullivan,Emma S. Walker,Dong Xu,C. Buton,R. Pereira +43 more
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TLDR
In this article, the authors studied the early evolution of a "normal" SN Ia, its compositional structure, and its elusive progenitor system using high signal-to-noise spectra.Abstract:
The nearby Type Ia supernova (SN Ia) SN 2011fe in M101 (cz = 241 km s^(–1)) provides a unique opportunity to study the early evolution of a "normal" SN Ia, its compositional structure, and its elusive progenitor system. We present 18 high signal-to-noise spectra of SN 2011fe during its first month beginning 1.2 days post-explosion and with an average cadence of 1.8 days. This gives a clear picture of how various line-forming species are distributed within the outer layers of the ejecta, including that of unburned material (C+O). We follow the evolution of C II absorption features until they diminish near maximum light, showing overlapping regions of burned and unburned material between ejection velocities of 10,000 and 16,000 km s^(–1). This supports the notion that incomplete burning, in addition to progenitor scenarios, is a relevant source of spectroscopic diversity among SNe Ia. The observed evolution of the highly Doppler-shifted O I λ7774 absorption features detected within 5 days post-explosion indicates the presence of O I with expansion velocities from 11,500 to 21,000 km s^(–1). The fact that some O I is present above C II suggests that SN 2011fe may have had an appreciable amount of unburned oxygen within the outer layers of the ejecta.read more
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Spectrophotometric time series of SN 2011fe from the Nearby Supernova Factory
R. Pereira,R. C. Thomas,Greg Aldering,P. Antilogus,C. Baltay,S. Benitez-Herrera,S. Bongard,C. Buton,A. Canto,F. Cellier-Holzem,J. Chen,M. J. Childress,M. J. Childress,N. Chotard,N. Chotard,Y. Copin,H. K. Fakhouri,H. K. Fakhouri,M. Fink,Dominique Fouchez,E. Gangler,Julien Guy,Wolfgang Hillebrandt,Eric Hsiao,M. Kerschhaggl,M. Kowalski,Markus Kromer,Jakob Nordin,Jakob Nordin,Peter Nugent,K. Paech,Reynald Pain,E. Pecontal,Saul Perlmutter,Saul Perlmutter,David Rabinowitz,M. Rigault,K. Runge,C. Saunders,G. Smadja,Charling Tao,Charling Tao,S. Taubenberger,A. Tilquin,C. Y. Wu,C. Y. Wu +45 more
TL;DR: In this paper, 32 epochs of optical (3300−9700 A) spectrophotometric observations of the nearby quintessential "normal" type Ia supernova (SN Ia) SN 2011fe in the galaxy M101, extending from −15 to +97 d with respect to B -band maximum, obtained by the Nearby Supernova Factory collaboration.
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