Mass and orbit constraints of the gamma-ray binary LS 5039

Details Mass and orbit constraints of the gamma-ray binary LS 5039 Mass and orbit constraints of the gamma-ray binary LS 5039

2011-08-16

arxiv.org/abs/1108.3205v1

Astronomy and Astrophysics

Astrophysics

Solar and Stellar Astrophysics

2 pages, 1 figure (with 2 panels); to be published in the Proceedings: From Interacting Binaries to Exoplanets: Essential Mode

Scientific paper

We present the results of space-based photometric and ground-based spectroscopic observing campaigns on the gamma-ray binary LS 5039. The new orbital and physical parameters of the system are similar to former results, except we found a lower eccentricity. Our MOST-data show that any broad-band optical photometric variability at the orbital period is below the 2 mmag level. Light curve simulations support the lower value of eccentricity and imply that the mass of the compact object is higher than 1.8 solar masses.

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