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Multi-planetary systems:

Multi-planetary systems:. Multi-planetary systems. Binaries. Single Star and Single Planetary Systems. Classification of the known multi-planet systems (S.Ferraz-Mello, 2005). Class Ia –> Planets in mean motion resonance Class Ib  Low-eccentricity near-resonant planet

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Multi-planetary systems:

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  1. Multi-planetary systems:

  2. Multi-planetary systems • Binaries • Single Star and Single Planetary Systems

  3. Classification of the known multi-planet systems (S.Ferraz-Mello, 2005) • Class Ia –>Planets in mean motion resonance • Class Ib Low-eccentricity near-resonant planet pairs • Class IINon-resonant planets with significant secular dynamics • Class IIIHierarchical planet pairs

  4. Class Ia -- Planets in mean-motion resonance This class contains planet pairs with large masses and eccentric orbits that are relatively close to each other, where strong gravitational interactions occur. Such systems remain stable if the two planets are in mean motion resonance (MMR).

  5. Star Planet mass_P a_P e_P Period [M_Sun] [M_Jup] [AU] [days] GJ 876 b 0.597 0.13 0.218 30.38 (0.32) c 1.90 0.21 0.029 60.93 55 Cnc b 0.784 0.115 0.02 14.67 (1.03) c 0.217 0.24 0.44 43.93 HD82942 b 1.7 0.75 0.39 219.5 (1.15) c 1.8 1.18 0.15 436.2 HD202206 b 17.5 0.83 0.433 256.2 (1.15) c 2.41 2.44 0.284 1296.8

  6. Class 1b -- Low-eccentricity near-resonant planet pairs A mean motion resonance of the planet pair is not needed to guarantee the long-term stability of the system. Therefore, the eccentricities of the planets have to be small to exclude a crossing of the orbits. As an example we state the 47Uma system, which is possibly near the 5:2 or 7:3 MMR but the orbital parameters show that a resonance is not needed for the stability of the system. Star Planet mass_P a_P e_P Period [M_Sun] [M_Jup] [AU] [days] 47Uma b 2.9 2.1 0.05 1079.2 (1.03) c 1.1 4.0 0.0 2845.0

  7. Unstable orbits • 2:1 1.3 AU • 3:1 1 AU • SR 0.8 – 0.9 AU • 4:1 0.82 AU • Stable orbits • Between resonances habitable zone Terrestrial planet is possible!

  8. Class II -- Non-resonant planets with significant secular dynamics Planet pairs of this class can have strong gravitational interactions, where long-term variations are ascribed to secular perturbations, large variations of the eccentricities and dynamical effects like the alignment and anti-alignment for the apsidal lines. For the long-term stability of such a system, it is not necessary hat the planets are in MMR.

  9. Star Planet mass_P a_P e_P Period [M_Sun] [M_Jup] [AU] [days] 55 Cnc e 0.045 0.038 0.17 2.808 (1.03) b 0.784 0.115 0.02 14.67 HD169830 b 2.88 0.81 0.31 225.62 (1.4) c 4.04 3.6 0.33 2102 HD37124 b 0.72 0.54 0.1 153 (0.91) c ? 1.3 2.5 0.7 1595 (Ups And, HD12661, HD160691)

  10. Class III -- Hierarchical planet pairs Roughly speaking this class is for all planet pairs with a large ratio of their orbital periods -- P1/P2 > 10. Due to the large ratio of periods the gravitational interaction are not so strong like in class II and the probability of a capture in a MMR is negligible. The weaker interactions lead to stable motion in the numerical simulations, even if the orbits of the planet are not so good determined.

  11. Star Planet mass_P a_P e_P Period [M_Sun] [M_Jup] [AU] [days] HD168443 b 7.7 0.29 0.529 58.116 (1.01) c 16.9 2.85 0.228 1739.5 HD74156 c 1.86 0.294 0.636 51.643 (1.27) b 6.17 3.40 0.583 2025.0 HD38529 b 0.78 0.129 0.29 14.309 (1.39) c 12.7 3.68 0.36 2174.3

  12. Class 1b -- Low-eccentricity near-resonant planet pairs A mean motion resonance of the planet pair is not needed to guarantee the long-term stability of the system. Therefore, the eccentricities of the planets have to be small to exclude a crossing of the orbits.

  13. Motivation A study of Extra-solar planetary systems similar to our solar system

  14. Initial Conditions and Computations Jupiter:on its orbit Saturn: a_sat = 8 ..... 11 AU m_sat = 1 .... 30xm_Sat Testplanets in the HZ: a_tp = 0.6 ..... 1.6 AU Mercury 6 (J. Chambers) Integration time: 20 mio years HZ: maximum ecc.

  15. HZ im Sonnensystem: • Kasting: 0.93 – 1.3 AU • Mischna: 0.93 – 1.7 AU • Forget: 0.93 – 2 AU a< 0.93 AU H2O becomes a major atmospheric compound and is rapidly lost to space after UV photolysis a>1.3 AU  CO2 condensates in the atmosphere producing CO2-clouds, that can affect significantly the T-CO2 coupling

  16. Sun – Jupiter – Saturn

  17. Sun – Jupiter – Saturn

  18. Influence of a third giant planet Jupiter – Saturn -Uranus Jupiter -- Saturn

  19. Influence of a third giant planet Jupiter – Saturn -Uranus Jupiter -- Saturn

  20. Sun-Jupiter-Saturn-Uranus Influence on an Earth-like planet at 1 AU

  21. Earth-like planets in inclined multi-planetary systems similar to the Solar system

  22. Motivation The discovery of the planetary system OGLE 06-109l

  23. Initial Conditions and Computations Jupiter:on its orbit Saturn: a_sat = 8 ..... 11 AU i_sat = 10 .... 60 deg Testplanets in the HZ: a_tp = 0.6 ..... 1.6 AU Mercury 6 (J. Chambers) Integration time: 20 mio years HZ: maximum ecc.

  24. Sun – Jupiter – Saturn

  25. Increase of iSaturn= 10deg

  26. Orbits of Venus, Earth and Mars

  27. iSaturn = 20deg Escape of Saturn for a_Sat = 8.2 AU

  28. iSaturn =30deg

  29. iSaturn = 40deg

  30. iSaturn = 50 deg

  31. Conclusion • The inclination of Saturn influences the inner Solar system • For small i -- the two planets in MMR • High i -- may lead to escapes of Saturn • For i > 60 all systems are unstable

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