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Title: High-energy Variability of PSR J1311-3430

Here, we have studied the variability of the black-widow-type binary millisecond pulsar PSR J1311–3430 from optical to gamma-ray energies. We confirm evidence for orbital modulation in the weak off-pulse ≳200 MeV emission, with a peak at $${\phi }_{B}\approx 0.8$$, following pulsar inferior conjunction. The peak has a relatively hard spectrum, extending above ~1 GeV. XMM-Newton and Swift UV observations also show that this source's strong X-ray flaring activity is associated with optical/UV flares. With a duty cycle of ~7%–19%, this flaring is quite prominent with an apparent power-law intensity distribution. Flares are present at all orbital phases, with a slight preference for $${\phi }_{B}=0.5\mbox{--}0.7$$. We explore possible connections of these variabilities with the intrabinary shock and magnetic activity on the low-mass secondary.
ORCiD logo [1] ; ORCiD logo [2] ;  [3] ; ORCiD logo [3] ; ORCiD logo [4]
  1. Chungbuk National Univ., Cheongju (Korea); Stanford Univ., Stanford, CA (United States)
  2. Stanford Univ., Stanford, CA (United States)
  3. George Mason Univ., Fairfax, VA (United States)
  4. Max-Planck-Institut fur Gravitationsphysik, Hannover (Germany); Leibniz Univ. Hannover, Hannover (Germany)
Publication Date:
Grant/Contract Number:
Accepted Manuscript
Journal Name:
The Astrophysical Journal (Online)
Additional Journal Information:
Journal Name: The Astrophysical Journal (Online); Journal Volume: 850; Journal Issue: 1; Journal ID: ISSN 1538-4357
Institute of Physics (IOP)
Research Org:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org:
Country of Publication:
United States
79 ASTRONOMY AND ASTROPHYSICS; binaries: close; gamma-rays: stars; pulsars: individual (PSR J1311-3430); X-rays: binaries
OSTI Identifier: