The Whisper of a Whimper of a Bang: 2400 Days of the Type Ia SN 2011fe Reveals the Decay of ${}^{55}$Fe

Abstract

We analyze new multi-filter Hubble Space Telescope (HST) photometry of the normal Type Ia supernova (SN Ia) 2011fe out to $\approx 2400$days after maximum light, the latest observations to-date of a SN Ia. We model the pseudo-bolometric light curve with a simple radioactive decay model and find energy input from both ${}^{57}$Co and ${}^{55}$Fe are needed to power the late-time luminosity. This is the first detection of ${}^{55}$Fe in a SN Ia. We consider potential sources of contamination such as a surviving companion star or delaying the deposition timescale for ${}^{56}$Co positrons but these scenarios are ultimately disfavored. The relative isotopic abundances place direct constraints on the burning conditions experienced by the white dwarf (WD). Additionally, we place a conservative upper limit of $<10^{-3}{M}_{\odot }$ on the synthesized mass of ${}^{44}$Ti. Only 2 classes of explosion models are currently consistent with all observations of SN2011fe: 1) the delayed detonation of a low-${\rho }_c$, near-${\mathrm{M}}_{\mathrm{Ch}}$ ($1.2-1.3M_{\odot }$) WD, or 2) a sub-${\mathrm{M}}_{\mathrm{Ch}}$ ($1.0-1.1M_{\odot }$) WD experiencing a thin-shell double detonation.

arXiv comment14 pages, 8 figures, 1 table. MNRAS, accepted

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