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 II supernovae (SNe) originate from the explosion of hydrogen-richsupergiant massive stars. Their first electromagnetic signature is the shockbreakout, a short-lived phenomenon which can last from hours to days dependingon the density at shock emergence. We present 26 rising optical light curves ofSN II candidates discovered shortly after explosion by the High cadenceTransient Survey (HiTS) and derive physical parameters based on hydrodynamicalmodels using a Bayesian approach. We observe a steep rise of a few days in 24out of 26 SN II candidates, indicating the systematic detection of shockbreakouts in a dense circumstellar matter consistent with a mass loss rate$\dot{M} > 10^{-4} M_\odot yr^{-1}$ or a dense atmosphere. This implies thatthe characteristic hour timescale signature of stellar envelope SBOs may berare in nature and could be delayed into longer-lived circumstellar materialshock breakouts in most Type II SNe.

The delay of shock breakout due to circumstellar material seen in most Type II Supernovae