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 extensive ultraviolet (UV) and optical photometry, as well asdense optical spectroscopy for type II Plateau (IIP) supernova SN 2016X thatexploded in the nearby ($\sim$ 15 Mpc) spiral galaxy UGC 08041. Theobservations span the period from 2 to 180 days after the explosion; inparticular, the Swift UV data probably captured the signature of shock breakoutassociated with the explosion of SN 2016X. It shows very strong UV emissionduring the first week after explosion, with contribution of $\sim$ 20 -- 30% tothe bolometric luminosity (versus $\lesssim$ 15% for normal SNe IIP). Moreover,we found that this supernova has an unusually long rise time of about 12.6$\pm$ 0.5 days in the $R$ band (versus $\sim$ 7.0 days for typical SNe IIP).The optical light curves and spectral evolution are quite similar to thefast-declining type IIP object SN 2013ej, except that SN 2016X has a relativelybrighter tail. Based on the evolution of photospheric temperature as inferredfrom the $Swift$ data in the early phase, we derive that the progenitor of SN2016X has a radius of about 930 $\pm$ 70 R$_{\odot}$. This large-size star isexpected to be a red supergiant star with an initial mass of $\gtrsim$ 19 -- 20M$_{\odot}$ based on the mass $--$ radius relation of the Galactic redsupergiants, and it represents one of the most largest and massive progenitorsfound for SNe IIP.

SN 2016X: A Type II-P Supernova with A Signature of Shock Breakout from Explosion of A Massive Red Supergiant