English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

Type Iax supernovae (SN Iax) are the largest known class of peculiar whitedwarf supernovae, distinct from normal Type Ia supernovae (SN Ia). The uniqueproperties of SN Iax, especially their strong photospheric lines out toextremely late times, allow us to model their optical spectra and derivephysical parameters for the long-lasting photosphere. We present an extensivespectral timeseries, including 21 new spectra, of SN Iax 2014dt from +11 to+562 days after maximum light. We are able to reproduce the entire timeserieswith a self-consistent, nearly unaltered deflagration explosion model from Finket al. (2014) using TARDIS, an open-source radiative transfer code (Kerzendorf& Sim 2014; Kerzendorf et al. 2023). We find that the photospheric velocity ofSN 2014dt slows its evolution between +64 and +148 days, which closely overlapsthe phase when we see SN 2014dt diverge from the normal spectral evolution ofSN Ia (+90 to +150 days). The photospheric velocity at these epochs,~400$-$1000 km s$^{-1}$, may demarcate a boundary within the ejecta below whichthe physics of SN Iax and normal SN Ia differ. Our results suggest that SN2014dt is consistent with a weak deflagration explosion model that leavesbehind a bound remnant and drives an optically thick, quasi-steady-state windcreating the photospheric lines at late times. The data also suggest that thiswind may weaken at epochs past +450 days, perhaps indicating a radioactivepower source that has decayed away.

Over 500 Days in the Life of the Photosphere of the Type Iax Supernova SN 2014dt