Akademik Veri Yönetim Sistemi
1st INTERNATIONAL SYMPOSIUM ON RECENT ADVANCES IN FUNDAMENTAL AND APPLIED SCIENCES (ISFAS-2021), Erzurum, Türkiye, 10 - 12 Eylül 2021, cilt.1, sa.1284, ss.174
Timing
Method For Exoplanets
Department of Astronomy and Space Science,
Ataturk University, Yakutiye, 25240 Erzurum, Turkey
In the past three decades, exoplanet research has led to the discovery
of thousands of exoplanets with the development of technology and detection
methods. One of these methods is the timing method which used for both single
stars (star-planet systems detected by transit method) and eclipsing binary
star systems. In these systems, the eclipse timings are examined by
fitting with a linear ephemeris, and the residuals (O–C: Observed – Calculated)
may show cyclical variations. These variations can result from the
gravitational effects of distant orbiting 3rd body which lead to swing the
stellar system (eclipsing binary stars or star-planet), causing the timing of
the eclipses to appear slightly early, on time, or late. This Light-Time (LTT:
Light-Travel Time for binary stars and TTV: Transit Time Variation for
star-planet systems) effect can then be measured and used to infer the presence
of 3rd body (exoplanet or brown dwarf) around the stellar system. In order to
determine whether the variations obtained from the O–C diagrams of the systems
to be examined are caused by the third body or not, the LTT/TTV signal must
show cyclic structures. These structures can be explained by N-body (single or
multi-planet model) models created by solving Kepler equations based on the
two-body problem. Characterization
of such bodies is potentially of great interest because it can lead to a better
understanding of the formation and evolution of planetary systems and the
orbital period evolution of their host stars. As a result of previous studies,
it has been determined that several eclipsing systems have variations in their
orbital periods. These variations are thought to be caused by the existence of
additional bodies in the system and/or other physical effects.