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Joachim Saur, Timo Grambusch , Stefan Duling University of Cologne, Germany

Moon-Planet and Exoplanet -Star Couplings: Common Electrodynamic Interaction Mechanisms Throughout the Universe. Joachim Saur, Timo Grambusch , Stefan Duling University of Cologne, Germany. Magnetic coupling: Satellite-planet. Clarke et al., 2002. Magnetic coupling : Planet-star.

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Joachim Saur, Timo Grambusch , Stefan Duling University of Cologne, Germany

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  1. Moon-Planet and Exoplanet-Star Couplings: Common Electrodynamic Interaction Mechanisms Throughout the Universe Joachim Saur, TimoGrambusch, Stefan Duling University of Cologne, Germany

  2. Magnetic coupling: Satellite-planet Clarke et al., 2002

  3. Magneticcoupling: Planet-star Evidence for Planet-Star Coupling: HD 179949 Radial distribution of Exoplanets Skolnik et al. (2003, 2005, 2008) Ca 3947 A line correlation with orbital period of 3.1 d Energy flux: 1020 W

  4. Ouraim: • Electromagneticplanet-starinteractionforexoplanets has beenstudiedby: • Ip et al. (2004), • Preusse et al. (2005, 2006) • Grießmeier et al. (2004, 2007) • Zarka (2007) • Lanza (2008, 2009) • Nichols (2011) • Poppenhaeger et a. (2010, 2011) • Thiswork: Energetics of thecoupling, whichisdominatedbythePoyntingflux.

  5. Model forenergyflux • CalculatePoyntingflux S= (E x B)/μ0 • Based on Alfven wingmodelby Neubauer (1980). Standard case Exoplanet geometry With internal field Neubauer 1998 Kivelson et al. 2004

  6. Total Poynting flux launched at satellite/planet • Limitation: No considerations about the fate of the energy along the flux tube • No partially reflection/transmission (Hess et al. 2010a,2010b) considered. • No nonlinear reflection at central body (Jacobsen et al. 2007) considered. • No conversion of Poynting flux into particle acceleration considered.

  7. Benchmarking at Jupiter and Saturn • Io: • Theory: 2 x 1012 W • UV Observations: 1-10 x 1010 W • Europa: • Theory: 1-7 x 1010 W • UV Observations: 1-5 x 108 W • Ganymede: • Theory: 1-3 x 1011 W • UV Observations: 2-15 x 108 W • Callisto: • Theory: 0.3-6 x 109 W • Enceladus: • Theory: 2x108 W • UV Observations: 106-107 W

  8. Estimated MA at all known 562*exoplanets * until last Friday

  9. Poynting flux for 192 exoplanets with MA<1

  10. Summary • Electromagnetic planet star coupling is possible if relative flow velocity < Alfven velocity. 192 of 562 exoplanets exhibit sub-Alfvenic interaction. • Only a few exoplanets generate energy fluxes large enough to be detectable. • HD 179949 b produces 1020 W if both exoplanet and star have magnetic fields 10 x stronger than Jupiter and sun, respectively.

  11. Parker Model for Properties near 564 Exoplanets

  12. Modelled Energy Flux:HD179949 and companion TS= 9d, FM = 1010 kg/s, r=0.045 AU, RS=1.19 Rsun, T=107 K, spectralclass: F8V

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