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

We present a novel technique to study Type Ia supernovae by constrainingsurviving companions of historical extragalactic SN by combining archivalphotographic plates and Hubble Space Telescope imaging. We demonstrate thistechnique for Supernova 1972E, the nearest known SN Ia in over 125 years. Somemodels of Type Ia supernovae describe a white dwarf with a non-degeneratecompanion that donates enough mass to trigger thermonuclear detonation.Hydrodynamic simulations and stellar evolution models show that these donorstars survive the explosion, and show increased luminosity for at least athousand years. Thus, late-time observations of the exact location of asupernova after its ejecta have faded can constrain the presence of a survivingdonor star and progenitor models. We find the explosion site of SN 1972E byanalyzing 17 digitized photographic plates taken with the European SouthernObservatory 1m Schmidt and 1 plate taken with the Cerro Tololo Inter-AmericanObservatory 1.5m telescope from 1972-1974. Using the \textit{Gaia} eDR3 catalogto determine Supernova 1972E's equatorial coordinates yields: $\alpha$ = 13$^h$39$^m$ 52.708$^s$ $\pm$ 0.004$^s$ and $\delta$ = $-$31\degree 40' 8\farcs97$\pm$ 0\farcs04 (ICRS). In 2005, HST/ACS imaged NGC 5253, the host galaxy of SN1972E, with the $F435W$, $F555W$, and $F814W$ filters covering the explosionsite. The nearest source detected is offset by 3.0 times our positionalprecision, and is inconsistent with the colors expected of a surviving donorstar. Thus, the 2005 HST observation rules out all Helium-star companionmodels, and the most luminous main-sequence companion model currently in theliterature. The remaining main-sequence companion models could be tested withdeeper HST imaging.

Blast From the Past: Constraining Progenitor Models of SN 1972E