Variability in the orbital profiles of the X-ray emission of the gamma-ray binary LS I +61 303

Abstract

We report on the analysis of Rossi X-ray Timing Explorer (RXTE) Proportional Counter Array (PCA) monitoring observations of the $\gamma$-ray binary system LS I +61 303, covering 35 full cycles of its orbital motion. This constitutes the largest continuous X-ray monitoring dataset analyzed to date for this source. Such an extended analysis allows us to report: a) the discovery of variability in the orbital profiles of the X- ray emission, b) the existence of a few (recent) short flares on top of the overall behavior typical of the source, which, given the PCA field-of-view, may or may not be associated with LS I +61 303, and c) the determination of the orbital periodicity using soft X-ray data alone.

The Astrophysical Journal Letters (2010), in press

References in corpus (14)

• Gamma-ray binaries: pulsars in disguise ?
• Fermi LAT Observations of LS I +61 303: First detection of an orbital modulation in GeV Gamma Rays
• Joint H-alpha and X-Ray Observations of Massive X-Ray Binaries. II. The Be X-ray Binary and Microquasar LS I +61 303
• INTEGRAL and XMM-Newton observations of LSI +61 303
• Propagation of very high energy gamma-rays inside massive binaries LS 5039 and LSI +61 303
• XMM-Newton observation of a spectral state transition in the peculiar radio/X-ray/gamma-ray source LS I +61 303
• Correlated X-ray and Very High Energy emission in the gamma-ray binary LS I +61 303
• Chandra Observations of the Gamma-ray Binary LSI+61303: Extended X-ray Structure?
• Pulsar wind zone processes in LS 5039
• Multiwavelength Observations of LS I +61 303 with VERITAS, Swift and RXTE
• Radio Spectral Index Analysis and Classes of Ejection in LS I +61 303
• Deep Chandra observations of TeV binaries I: LSI +61 303
• gamma-ray emission from LS I +61 303: The impact of basic system uncertainties
• Swift/XRT monitoring of five orbital cycles of LSI +61 303

Cited by in corpus (25)

• Gamma-ray binaries and related systems
• Long-term monitoring of the high-energy gamma-ray emission from LS I +61° 303 and LS 5039
• A magnetar-like event from LS I +61 303 and its nature as a gamma-ray binary
• Associating long-term gamma-ray variability with the superorbital period of LS I 61 303
• VERITAS Observations of the TeV Binary LS I +61 303 During 2008-2010
• Unveiling the super-orbital modulation of LS I +61 303 in X-rays
• Superorbital modulation of X-ray emission from gamma-ray binary LSI +61 303
• Deep Chandra observations of TeV binaries II: LS 5039
• Possible changes of state and relevant timescales for a neutron star in LS I +61°303
• Long-term X-ray monitoring of LS I +61 303: analysis of spectral variability and flares
• A Radio Pulsar Search of the Gamma-ray Binaries LS I +61 303 and LS 5039
• GeV detection of HESS J0632+057
• Extended X-ray emission in the vicinity of the microquasar LS 5039: pulsar wind nebula?
• H-alpha observations of the gamma-ray-emitting Be/X-ray binary LSI+61303: orbital modulation, disk truncation, and long-term variability
• Spectral analysis in orbital/superorbital phase space and hints of superorbital variability in the hard X-rays of LS I +61 303
• Detection of the gamma-ray binary LS I +61 303 in a low flux state at Very High Energy gamma-rays with the MAGIC Telescopes in 2009
• Search for radio pulsations in 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
• Searches for periodic neutrino emission from binary systems with 22 and 40 strings of IceCube
• Very high energy Fermi/LAT detection of HESS J0632+057
• Connection between orbital modulation of H-alpha and gamma-rays in the Be/X-ray binary LSI+61303
• Decade-long X-ray observations of HESS J0632+057
• Does the gamma-ray binary LS I +61°303 harbor a magnetar?
• Rapid X-ray variability of the gamma-ray binary LS I+61 303
• Spectral lags of flaring events in $LSI+61^o$ 303 from RXTE Observations