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

Searches for circumstellar material around Type Ia supernovae (SNe Ia) areone of the most powerful tests of the nature of SN Ia progenitors, and radioobservations provide a particularly sensitive probe of this material. Here wereport radio observations for SNe Ia and their lower-luminosity thermonuclearcousins. We present the largest, most sensitive, and spectroscopically diversestudy of prompt (delta t <~ 1 yr) radio observations of 85 thermonuclear SNe,including 25 obtained by our team with the unprecedented depth of the Karl G.Jansky Very Large Array. With these observations, SN 2012cg joins SN 2011fe andSN 2014J as a SN Ia with remarkably deep radio limits and excellent temporalcoverage (six epochs, spanning 5--216 days after explosion, yielding Mdot/v_w<~ 5 x 10^-9 M_sun/yr / (100 km/s), assuming epsilon_B = 0.1 and epsilon_e =0.1).  All observations yield non-detections, placing strong constraints on thepresence of circumstellar material. We present analytical models for thetemporal and spectral evolution of prompt radio emission from thermonuclear SNeas expected from interaction with either wind-stratified or uniform densitymedia. These models allow us to constrain the progenitor mass loss rates, withlimits ranging from Mdot <~ 10^-9--10^-4 M_sun/yr, assuming a wind velocityv_w=100 km/s. We compare our radio constraints with measurements of Galacticsymbiotic binaries to conclude that <~10% of thermonuclear SNe have red giantcompanions.

A Deep Search for Prompt Radio Emission from Thermonuclear Supernovae with the Very Large Array