Kavli Affiliate: David Charbonneau
| First 5 Authors: Tim Cunningham, Ilaria Caiazzo, Nikolaus Z. Prusinski, James Fuller, John C. Raymond
| Summary:
The recently discovered Pa 30 nebula, the putative type Iax supernova remnant
associated with the historical supernova of 1181 AD, shows puzzling
characteristics that make it unique among known supernova remnants. In
particular, Pa 30 exhibits a complex morphology, with a unique radial and
filamentary structure, and it hosts a hot stellar remnant at its center, which
displays oxygen-dominated, ultra-fast winds. Because of the surviving stellar
remnant and the lack of hydrogen and helium in its filaments, it has been
suggested that Pa 30 is the product of a failed thermonuclear explosion in a
near- or super-Chandrasekhar white dwarf, which created a sub-luminous
transient, a rare sub-type of the Ia class of supernovae called type Iax. We
here present a detailed study of the 3D structure and velocities of a full
radial section of the remnant. The Integral Field Unit (IFU) observations,
obtained with the new red channel of the Keck Cosmic Web Imager spectrograph,
reveal that the ejecta are consistent with being ballistic, with velocities
close to the free-expansion velocity. Additionally, we detect a large cavity
inside the supernova remnant and a sharp inner edge to the filamentary
structure, which coincides with the outer edge of a bright ring detected in
infrared images. Finally, we detect a strong asymmetry in the amount of ejecta
along the line of sight, which might hint to an asymmetric explosion. Our
analysis provides strong confirmation that the explosion originated from SN
1181.
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