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Extrasolar Planets Z:\exo\presentations\EGS2001_exo.ppt, 24.08.2015 10:54AM, 1 Tidal interactions of close-in extrasolar planets with their host stars.

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Presentation on theme: "Extrasolar Planets Z:\exo\presentations\EGS2001_exo.ppt, 24.08.2015 10:54AM, 1 Tidal interactions of close-in extrasolar planets with their host stars."— Presentation transcript:

1 Extrasolar Planets Z:\exo\presentations\EGS2001_exo.ppt, 24.08.2015 10:54AM, 1 Tidal interactions of close-in extrasolar planets with their host stars Ludmila Carone Institut für Geophysik und Meterologie Universität zu Köln, Cologne, Germany 5th Corot Week, 11. December 2003 in Berlin

2 Extrasolar Planets Z:\exo\presentations\EGS2001_exo.ppt, 24.08.2015 10:54AM, 2 Very close-in extrasolar planets

3 Extrasolar Planets Z:\exo\presentations\EGS2001_exo.ppt, 24.08.2015 10:54AM, 3 Tides raised by the star on the planet Close-in extrasolar planets (a < 0.05 AU) experience extreme gravitational interaction ->Tidal bulge on planet -> synchronous rotation (rotation = revolution)

4 Extrasolar Planets Z:\exo\presentations\EGS2001_exo.ppt, 24.08.2015 10:54AM, 4 Time to reach synchronous rotation Tides raised by the star on the planet -> synchronous rotation of the planet -> depends on planetary mass and radius

5 Extrasolar Planets Z:\exo\presentations\EGS2001_exo.ppt, 24.08.2015 10:54AM, 5 Time to reach synchronous rotation all planets a < 0.20 AU

6 Extrasolar Planets Z:\exo\presentations\EGS2001_exo.ppt, 24.08.2015 10:54AM, 6 Tides raised by the planet on the star Tidal bulge on the host star -> increase/decrease of semi major axis -> decrease/increase of stellar rotation

7 Extrasolar Planets Z:\exo\presentations\EGS2001_exo.ppt, 24.08.2015 10:54AM, 7 Tidal evolution Tides raised by the planet on the star  decrease/increase of semi major axis  Spin-up/decrease of star rotation depends on planetary mass and star radius

8 Extrasolar Planets Z:\exo\presentations\EGS2001_exo.ppt, 24.08.2015 10:54AM, 8 The parameters k * and Q * Evolution time scale depends strongly on stellar love number k * and the stellar tidal dissipation factor Q * Pätzold & Rauer (2002) favor:

9 Extrasolar Planets Z:\exo\presentations\EGS2001_exo.ppt, 24.08.2015 10:54AM, 9 OGLE-TR-56b (an extreme planet) OGLE-TR-56b was discovered during the OGLE-survey (Konacki et al, 2003) Parameters: extremly close distance to its host star & large mass -> very strong tidal interactions

10 Extrasolar Planets Z:\exo\presentations\EGS2001_exo.ppt, 24.08.2015 10:54AM, 10 OGLE-TR-56b: Evolution of semi major axis

11 Extrasolar Planets Z:\exo\presentations\EGS2001_exo.ppt, 24.08.2015 10:54AM, 11 OGLE-TR-56b: Evolution of stellar rotation

12 Extrasolar Planets Z:\exo\presentations\EGS2001_exo.ppt, 24.08.2015 10:54AM, 12 OGLE-TR-56b: Evolution of stellar rotation (only in convection envelope)

13 Extrasolar Planets Z:\exo\presentations\EGS2001_exo.ppt, 24.08.2015 10:54AM, 13 Time to reach roche limit

14 Extrasolar Planets Z:\exo\presentations\EGS2001_exo.ppt, 24.08.2015 10:54AM, 14 Conclusion OGLE-TR-56b may reach the roche limit within the lifetime of its host star Tidal effects could lead to a considerable spin up in stellar rotation Even more so, when only spin-up in convection envelope is considered (no friction between core and envelope) The strength of tidal effects depends strongly on the planet‘s mass and the semi major axis But for a better prediction the geophyisical properties Q * and k * have to be determined -> we need more data

15 Extrasolar Planets Z:\exo\presentations\EGS2001_exo.ppt, 24.08.2015 10:54AM, 15 Very close-in extrasolar planets

16 Extrasolar Planets Z:\exo\presentations\EGS2001_exo.ppt, 24.08.2015 10:54AM, 16 OGLE-TR-3b: Evolution of semi major axis

17 Extrasolar Planets Z:\exo\presentations\EGS2001_exo.ppt, 24.08.2015 10:54AM, 17 OGLE-TR-3b: Evolution of stellar rotation

18 Extrasolar Planets Z:\exo\presentations\EGS2001_exo.ppt, 24.08.2015 10:54AM, 18 OGLE-TR-3b: Evolution of stellar rotation (only in convection envelope)

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