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DYNAMICAL HABITABILITY IN THE EXTRASOLAR PLANETARY SYSTEMS 47 URSAE MAJORIS AND 55 CANCRI

DYNAMICAL HABITABILITY IN THE EXTRASOLAR PLANETARY SYSTEMS 47 URSAE MAJORIS AND 55 CANCRI. Siegfried Franck Christine Bounama Werner von Bloh. Potsdam Institute for Climate Impact Research. 35 th Meeting of the AAS Devision on Dynamical Astronomy Cannes/ France, April 19-24, 2004.

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DYNAMICAL HABITABILITY IN THE EXTRASOLAR PLANETARY SYSTEMS 47 URSAE MAJORIS AND 55 CANCRI

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  1. DYNAMICAL HABITABILITY IN THE EXTRASOLAR PLANETARY SYSTEMS 47 URSAE MAJORIS AND 55 CANCRI Siegfried Franck Christine Bounama Werner von Bloh Potsdam Institute for Climate Impact Research 35th Meeting of the AAS Devision on Dynamical Astronomy Cannes/ France, April 19-24, 2004

  2. HABITABLE ZONES HZ: range of orbital distances, where the physical conditions at the planet‘s surface are favorable for the existence of life

  3. HABITABLE ZONES HZ := {R| Π(Patm(R,t), Ts(R,t)) > 0}

  4. THE EXOPLANETARY SYSTEM 47UMa The Star47 Ursae Majoris Spectral Class: G0V Distance:45 lightyears Luminosity:1.54 Lsolar ( 0.13) Mass:1.03 Solar Masses Age:6.3 Gyr (+1.2, –1.0)

  5. DYNAMICAL HABITABILITY Jones et al. (2001, 2002, 2003) MVS (Mixed Variable Symplectic Integration Method) eccentricity small (inside HZ); R outside 3 RHill Rout ~ 1.32 AU Noble et al. (2002) Gozdziewski (2002) Rout ~ 1.25 AU MEGNO (Mean Exponential GrowthFactor of Nearby Orbits) Rout ~ 1.30 AU

  6. RESULTS FOR 47UMa Cuntz, M., von Bloh, W., Bounama, C., Franck, S., Icarus 162, 214, 2003 Franck, S., Cuntz, M., von Bloh, W., Bounama, C., Int. J. Astrobiology 2(1), 35, 2003

  7. CONCLUSIONS • Possibility for dynamicallyhabitable Earth-like planets in the systems 47 UMa and55 Cnc • Higher probability for „water worlds“ ofbeinghabitable www.pik-potsdam.de/PLACES

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