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 the discovery and follow-up observations of SN 2008jb, acore-collapse supernova in the dwarf irregular galaxy ESO 302-14 at 9.6 Mpc.This transient was missed by galaxy-targeted surveys and was only found inarchival optical images obtained by CRTS and ASAS. It was detected shortlyafter explosion and reached a bright optical maximum, Vmax = 13.6 mag (M_Vmax ~-16.5). The shape of the light curve shows a plateau of 100 days, followed by adrop of 1.4 mag in V-band to a decline with the approximate Co 56 decay slope,consistent with 0.04 Msun of Ni 56 synthesized in the explosion. A spectrumobtained 2 years after explosion shows a broad, boxy Halpha emission line,which is unusual for type IIP supernovae. We detect the supernova in archivalSpitzer and WISE images obtained 8-14 months after explosion, which show clearsigns of warm dust emission. The dwarf irregular host galaxy has a lowgas-phase oxygen abundance, 12 + log(O/H) = 8.2 (~1/5 Solar), similar to thoseof the SMC and the hosts of long gamma-ray bursts and luminous core-collapsesupernovae. We study the host environment using GALEX FUV, R-band, and Halphaimages and find that the supernova occurred in a large star-formation complex.The morphology of the Halpha emission appears as a large shell (R = 350 pc)surrounding the FUV and optical emission. We estimate an age of ~9 Myr and atotal mass of ~2 x 10^5 Msun for the star-formation complex. These propertiesare consistent with the expanding Halpha supershells observed in well-studiednearby dwarf galaxies, which are tell-tale signs of feedback from thecumulative effect of massive star winds and supernovae. The age estimated forthe star-forming region suggests a relatively high-mass progenitor star withinitial mass of ~20 Msun. We discuss the implications of these findings in thestudy of core-collapse supernova progenitors. (Abridged)

SN 2008jb: A "Lost" Core-Collapse Supernova in a Star-Forming Dwarf Galaxy at ~10 Mpc