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- W3209486047 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-$rm{M}_{rm{Ch}}$ ($1.2-1.3~M_odot$) WD, or 2) a sub-$rm{M}_{rm{Ch}}$ ($1.0-1.1~M_odot$) WD experiencing a thin-shell double detonation." @default.
- W3209486047 created "2021-11-08" @default.
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- W3209486047 date "2021-11-01" @default.
- W3209486047 modified "2023-09-23" @default.
- W3209486047 title "The Whisper of a Whimper of a Bang: 2400 Days of the Type Ia SN 2011fe Reveals the Decay of $^{55}$Fe" @default.
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- W3209486047 doi "https://doi.org/10.48550/arxiv.2111.01144" @default.
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