Unveiling the super-orbital modulation of LS I +61 303 in X-rays

Abstract

From the longest monitoring of LS I +61 303 done to date by the Rossi X-ray Timing Explorer (RXTE) we found evidence for the long-sought, years- long modulation in the X-ray emission of the source. The time evolution of the modulated fraction in the orbital lightcurves can be well fitted with a sinusoidal function having a super-orbital period of 1667 days, the same as the one reported in non-contemporaneous radio measurements. However, we have found a 281.8 \pm 44.6 days shift between the super-orbital variability found at radio frequencies extrapolated to the observation time of our campaign and what we found in the super-orbital modulation of the modulated fraction of our X-ray data. We also find a super-orbital modulation in the maximum count rate of the orbital lightcurves, compatible with the former results, including the shift.

11 pages, 3 figures, 1 table, Accepted to ApJ Letters

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• Long-term TeV and X-ray Observations of the Gamma-ray Binary HESS J0632+057
• Associating long-term gamma-ray variability with the superorbital period of LS I 61 303
• Superorbital modulation of X-ray emission from gamma-ray binary LSI +61 303
• Super-orbital variability of LS I +61°303 at TeV energies
• Possible changes of state and relevant timescales for a neutron star in LS I +61°303
• Exceptionally bright TeV flares from the binary LS I +61${}^{\circ }$ 303
• GeV detection of HESS J0632+057
• Observation of the gamma-ray binary HESS J0632+057 with the H.E.S.S., MAGIC, and VERITAS telescopes
• H-alpha observations of the gamma-ray-emitting Be/X-ray binary LSI+61303: orbital modulation, disk truncation, and long-term variability
• Study of orbital and superorbital variability of LSI +61 303 with X-ray data
• Spectral analysis in orbital/superorbital phase space and hints of superorbital variability in the hard X-rays of LS I +61 303
• Evidence of coupling between the thermal and nonthermal emission in the gamma-ray binary LS I +61 303
• Multiwavelength Observations of The TeV Binary LS I +61 303 with VERITAS, Fermi-LAT and Swift-XRT During a TeV Outburst
• The GeV emission of PSR B1259-63 during its last three periastron passages observed by Fermi-LAT
• Superorbital modulation at GeV energies in the gamma-ray binary LS I +61 303
• The Multi-wavelength Characteristics of the TeV Binary LS I +61${}^{\circ }$ 303
• Connection between orbital modulation of H-alpha and gamma-rays in the Be/X-ray binary LSI+61303
• Temporal features of LS I +61${}^{\circ }$303 in hard X-rays from the Swift/BAT survey data
• A Precessing Jet Scenario for the Multi-Wavelength Long-Term Modulation of LS I +61${}^{\circ }$303
• A precessing stellar disk model for superorbital modulations of the gamma-ray binary LS I+61${}^{\circ }$ 303
• Achromatic rapid flares in hard X-rays in the $\gamma$-ray binary LS I +61-303
• Rapid X-ray variability of the gamma-ray binary LS I+61 303
• Recurrent outbursts revealed in 3XMM J031820.8-663034
• Optical microflares in LS I +61 303 and the search for their multiwavelength counterpart
• INTEGRAL View of TeV Sources: A Legacy for the CTA Project
• Unveiling the super-orbital modulation of LSI +61 303 in X-rays
• Spectral lags of flaring events in $LSI+61^o$ 303 from RXTE Observations