The Orbits of the Gamma-ray Binaries LS I +61 303 and LS 5039

Abstract

LS I +61 303 and LS 5039 are two of only a handful of known high mass X-ray binaries (HMXBs) that exhibit very high energy emission in the MeV-TeV range, and these "gamma-ray binaries" are of renewed interest due to the recent launch of the Fermi Gamma-ray Space Telescope. Here we present new radial velocities of both systems based on recent red and blue optical spectra. Both systems have somewhat discrepant orbital solutions available in the literature, and our new measurements result in improved orbital elements and resolve the disagreements. The improved geometry of each orbit will aid in studies of the high energy emission region near each source.

arXiv commentAccepted to ApJ, 13 pages, preprint2 style

References in corpus (17)

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• Exploring the connection between the stellar wind and the non-thermal emission in LS 5039
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Cited by in corpus (90)

• Gamma-ray binaries and related systems
• Fermi LAT Observations of LS I +61 303: First detection of an orbital modulation in GeV Gamma Rays
• Fermi LAT Observations of LS 5039
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• Relativistic Doppler-boosted emission in gamma-ray binaries
• A catalogue of high-mass X-ray binaries in the Galaxy: from the INTEGRAL to the Gaia era
• Long-term monitoring of the high-energy gamma-ray emission from LS I +61° 303 and LS 5039
• On the orbital parameters of Be/X-ray binaries in the Small Magellanic Cloud
• A magnetar-like event from LS I +61 303 and its nature as a gamma-ray binary
• On the binary nature of the gamma-ray sources AGL J2241+4454 (=MWC 656) and HESS J0632+057 (=MWC 148)
• A compact pulsar wind nebula model of the gamma-ray loud binary LS I +61 303
• A search for cyclical sources of gamma-ray emission on the period range from days to years in the Fermi-LAT sky
• Discovery of extended and variable radio structure from the gamma-ray binary system PSR B1259-63/LS 2883
• Correlated X-ray and Very High Energy emission in the gamma-ray binary LS I +61 303
• The gamma-ray binary LS 5039: mass and orbit constraints from MOST observations
• Orbital evolution of colliding star and pulsar winds in 2D and 3D; effects of: dimensionality, EoS, resolution, and grid size
• Sign of hard X-ray pulsation from the gamma-ray binary system LS 5039
• Associating long-term gamma-ray variability with the superorbital period of LS I 61 303
• Fermi Gamma-ray Space Telescope: High-Energy Results from the First Year
• Long-term optical variability of high-mass X-ray binaries. II. Spectroscopy
• VERITAS Observations of the TeV Binary LS I +61 303 During 2008-2010
• Evidence for mass-dependent peculiar velocities in compact object binaries: Towards better constraints on natal kicks
• Superorbital modulation of X-ray emission from gamma-ray binary LSI +61 303
• The Be Star HD 215227: A Candidate Gamma-ray Binary
• Periodic morphological changes in the radio structure of the gamma-ray binary LS 5039
• Physical properties of the gamma-ray binary LS 5039 through low and high frequency radio observations
• Deep Chandra observations of TeV binaries I: LSI +61 303
• On the origin of correlated X-ray/VHE emission from LS I +61 303
• Deep Chandra observations of TeV binaries II: LS 5039
• NuSTAR observation of LS 5039
• Possible changes of state and relevant timescales for a neutron star in LS I +61°303
• Modeling the three-dimensional pair cascade in binaries. Application to LS 5039
• Exploiting Orbital Constraints from Optical Data to Detect Binary Gamma-ray Pulsars
• Estimating the contribution of Galactic sources to the diffuse neutrino flux
• Super-orbital variability of LS I +61°303 at TeV energies
• Variability in the orbital profiles of the X-ray emission of the gamma-ray binary LS I +61 303
• Long-term X-ray monitoring of LS I +61 303: analysis of spectral variability and flares
• Overview of non-transient gamma-ray binaries and prospects for the Cherenkov Telescope Array
• High-energy emissions from the gamma-ray binary LS 5039
• On the origin of LS 5039 and PSR J1825-1446
• A Radio Pulsar Search of the Gamma-ray Binaries LS I +61 303 and LS 5039
• X-ray absorption and occultation in LS 5039
• Constraints to neutron-star kicks in High-Mass X-ray Binaries with Gaia EDR3
• Exceptionally bright TeV flares from the binary LS I +61${}^{\circ }$ 303
• MONOS.II. Orbit review and analysis for 35 single-lined spectroscopic binary systems and candidates
• Long-term monitoring of LS I+61303 with INTEGRAL
• H-alpha observations of the gamma-ray-emitting Be/X-ray binary LSI+61303: orbital modulation, disk truncation, and long-term variability
• Orbital variability of the optical linear polarization of the $\gamma$-ray binary LS I +61 303 and new constraints on the orbital parameters
• Study of orbital and superorbital variability of LSI +61 303 with X-ray data
• Optical spectroscopy of Be/gamma-ray binaries
• A Faraday Rotation Study of the Stellar Bubble and HII Region Associated with the W4 Complex
• Feasibility Study of Lense-Thirring Precession in LS I +61303
• Evidence of coupling between the thermal and nonthermal emission in the gamma-ray binary 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
• H-alpha Emission Variability in the gamma-ray Binary LS I +61 303
• Radio absorption in high-mass gamma-ray binaries
• Revisiting LS I +61 303 with VLBI astrometry
• Multiwavelength Observations of The TeV Binary LS I +61 303 with VERITAS, Fermi-LAT and Swift-XRT During a TeV Outburst
• Monte-Carlo Simulations of Radio Emitting Secondaries in Gamma-Ray Binaries
• Impact of the orbital uncertainties on the timing of pulsars in binary systems
• Superorbital modulation at GeV energies in the gamma-ray binary LS I +61 303
• Finding the birthplace of HMXBs in the Galaxy using Gaia EDR3: kinematical age determination through orbit integration
• Chandra Imaging of Gamma-Ray Binaries
• 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
• Modelling the correlated keV/TeV light curves of Be/gamma-ray binaries
• Broad-Band High-Energy Emission of the Gamma-ray Binary System LS 5039: Spectral and Temporal Features using NuSTAR and Fermi Observations
• Gamma-ray binaries beyond one-zone models: an application to LS 5039
• Phase-resolved hard X-ray emission of the high-mass binary LS 5039: a spectral hardening above 50 keV detected with INTEGRAL
• Orbital and superorbital variability of LS I +61 303 at low radio frequencies with GMRT and LOFAR
• Fast time optical variability in Be/X-ray binaries. Pulsation and rotation
• Temporal features of LS I +61${}^{\circ }$303 in hard X-rays from the Swift/BAT survey data
• Optical spectroscopy of the Be/black hole binary MWC656 -- interaction of a black hole with a circumstellar disc
• Inverse Compton Scattering Model for X-ray Emission of the Gamma-ray Binary LS 5039
• Owens Valley Radio Observatory monitoring of LS I +61°303 completes three cycles of the super-orbital modulation
• A precessing stellar disk model for superorbital modulations of the gamma-ray binary LS I+61${}^{\circ }$ 303
• Optical and Near-Infrared Monitoring of Gamma-ray Binaries Hosting Be Stars
• Tracing colliding winds in the UV line orbital variability of gamma-ray binaries
• Achromatic rapid flares in hard X-rays in the $\gamma$-ray binary LS I +61-303
• Unveiling properties of the non-thermal X-ray production in the gamma-ray binary LS 5039 using the long-term pattern of its fast X-ray variability
• Implications of the radio spectral index transition in LS I +61°303 for its INTEGRAL data analysis
• Looking into the heart of a beast: the black hole binary LS 5039
• Uncovering the identities of compact objects in high-mass X-ray binaries and gamma-ray binaries by astrometric measurements
• Gamma ray attenuation in X-ray binaries: An application to LSI +61 303
• VERITAS Observations of LS I +61 303 in the Fermi Era
• Secondary emission behind the radio outflows in gamma-ray binaries?
• Further evidence for natal kick segregation by spectral type in high-mass X-ray binaries
• Long-term optical variability of high-mass X-ray binaries. III. Polarimetry
• Mass and orbit constraints of the gamma-ray binary LS 5039