Séminaire Doctoral / Seminar PhD |
| « Study of the binary system LS 5039 » |
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Jolan Lavoisier |
| A binary system is an astrophysical object composed of a star and a compact object (i.e. a black hole or a neutron star) orbiting each other. It can emit different types of particles, like X-rays or gamma rays. The binary system LS 5039 was the first to be categorized as a gamma binary : it produces gamma-ray emissions that dominate the radiative output of the system. Here we report the study of its orbital period and its evolution with the High Energy Stereoscopic System (H.E.S.S.), that is specialized in the observation of very-high energy gamma rays. First, we recall some generalities about binary systems and their geometry, very-high energy gamma rays detection, and then, after having presented the binary LS 5039, we perform an optimization of the analysis criteria towards variability measurement, and finally we compute the period evolution parameter. This parameter tells us that the system might be compatible with a stable orbital period scenario. |
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vendredi 17 janvier 2025 - 16:00 Salle des séminaires Évry Schatzman, Institut d'Astrophysique |
| Page web du séminaire / Seminar's webpage |