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 Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

We have analyzed the optical light curves of the blazar OJ 287 obtained withthe Transiting Exoplanet Survey Satellite (TESS) over about 80 days from 2021October 13 to December 31, with an unprecedented sampling of 2 minutes.Although significant variability has been found during the entire period, wehave detected two exceptional flares with flux nearly doubling and then nearlytripling over 2 days in the middle of 2021 November. We went through the lightcurves analysis using the excess variance, generalized Lomb-Scargleperiodogram, and Continuous Auto-Regressive Moving Average (CARMA) methods, andestimated the flux halving/doubling timescales. The most probable shortestvariability timescale was found to be 0.38 days in the rising phase of thefirst flare. We briefly discuss some emission models for the variability inradio-loud active galactic nuclei that could be capable of producing such fastflares.

Rapid Optical Flares in the Blazar OJ 287 on Intraday Timescales with TESS