The New Variability Phase of OJ 287 and Emergence of New Components in
  NIR to X-ray Region
  We present a multi-wavelength (MW) spectral and temporal study of the recent
activity of the claimed super-massive binary black hole system OJ 287 since
December 2015. The overall MW activity can be divided into two durations:
December 2015 - April 2016 (MJD: 57360 - 57500), showing strong activity from
near-infrared (NIR) to $\gamma$-rays and September 2016 - June 2017 (MJD: 57650
- 57930), showing intense NIR to X-ray variability concurrent with detection at
very high energies (VHE) by VERITAS, but without any signatures of variability
in the Fermi-LAT band. In the first duration, the variations are almost
simultaneous and the SEDs show new components in NIR-optical and optical-UV
region. The NIR-optical bump is consistent with standard accretion-disk (AD)
description while the optical-UV appears consistent with contributions from the
broad-line region. The extracted broadband SEDs also show a clear shift in
gamma-ray SED peak and can be explained with inverse Compton scattering of
photons from broad line region. In the second period, the variations are also
simultaneous except for one duration during which X-ray leads the optical/UV by
$\sim$ 5-6 day. The broadband SEDs, on the other hand, show mixture of a
typical OJ 287 SED and an HBL SED, consistent with an origin from two different
zones, one located at sub-parsec scales and other at parsec scales.
