The Open UniversitySkip to content

A compact degenerate primary-star progenitor of SN 2011fe

Bloom, Joshua S.; Kasen, Daniel; Shen, Ken J.; Nugent, Peter E.; Butler, Nathaniel R.; Graham, Melissa L.; Howell, D. Andrew; Kolb, Ulrich; Holmes, Stefan; Haswell, Carole A.; Burwitz, Vadim; Rodriguez, Juan and Sullivan, Mark (2012). A compact degenerate primary-star progenitor of SN 2011fe. Astrophysical Journal, 744(2) L17.

DOI (Digital Object Identifier) Link:
Google Scholar: Look up in Google Scholar


While a white dwarf (WD) is, from a theoretical perspective, the most plausible primary star of a Type Ia supernova (SN Ia), many other candidates have not been formally ruled out. Shock energy deposited in the envelope of any exploding primary contributes to the early SN brightness and, since this radiation energy is degraded by expansion after the explosion, the diffusive luminosity depends on the initial primary radius. We present a new non-detection limit of the nearby SN Ia 2011fe, obtained at a time that appears to be just 4 hr after explosion, allowing us to directly constrain the initial primary radius (Rp). Coupled with the non-detection of a quiescent X-ray counterpart and the inferred synthesized 56Ni mass, we show that Rp <~ 0.02 R (a factor of five smaller than previously inferred), that the average density of the primary must be ρp > 104 g cm–3, and that the effective temperature must be less than a few × 105 K. This rules out hydrogen-burning main-sequence stars and giants. Constructing the helium-burning and carbon-burning main sequences, we find that such objects are also excluded. By process of elimination, we find that only degeneracy-supported compact objects—WDs and neutron stars—are viable as the primary star of SN 2011fe. With few caveats, we also restrict the companion (secondary) star radius to R c <~ 0.1 R , excluding Roche-lobe overflowing red giant and main-sequence companions to high significance.

Item Type: Journal Item
Copyright Holders: 2012 IOP
ISSN: 1538-4357
Keywords: white dwarfs; supernova
Academic Unit/School: Faculty of Science, Technology, Engineering and Mathematics (STEM) > Physical Sciences
Faculty of Science, Technology, Engineering and Mathematics (STEM)
Item ID: 30986
Depositing User: Ulrich Kolb
Date Deposited: 10 Jan 2012 14:33
Last Modified: 07 Dec 2018 09:59
Share this page:


Altmetrics from Altmetric

Citations from Dimensions

Actions (login may be required)

Policies | Disclaimer

© The Open University   contact the OU