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 report the Fermi Large Area Telescope (LAT) detections of high-energy(>100 MeV) gamma-ray emission from two recent optically bright classical novae,V1369 Centauri 2013 and V5668 Sagittarii 2015. At early times, Fermitarget-of-opportunity observations prompted by their optical discoveriesprovided enhanced LAT exposure that enabled the detections of gamma-ray onsetsbeginning ~2 days after their first optical peaks. Significant gamma-rayemission was found extending to 39-55 days after their initial LAT detections,with systematically fainter and longer duration emission compared to previousgamma-ray detected classical novae. These novae were distinguished by multiplebright optical peaks that encompassed the timespans of the observed gamma rays.The gamma-ray light curves and spectra of the two novae are presented alongwith representative hadronic and leptonic models, and comparisons to othernovae detected by the LAT are discussed.

Fermi LAT Gamma-ray Detections of Classical Novae V1369 Centauri 2013 and V5668 Sagittarii 2015