1. Extrasolar views of Jupiter and Saturn Planetary Timescales conference January 17, 2004 Planetary Timescales conference January 17, 2004 U. Dyudina(1), P.Sackett(1), D. Bayliss(1), L Dones(2), H. Throop (2), A. Del Genio(3), C. Porco(4), S. Seager(5) (1)Mount Stromlo Obs., Australian National University (2)Southwest Research Institute, Boulder, USA (3)NASA Goddard Institute for Space Studies, NY, USA (4)Space Science Institute, Boulder, USA (5)DTM, Carnegie Institute at Washington, USA U. Dyudina(1), P.Sackett(1), D. Bayliss(1), L Dones(2), H. Throop (2), A. Del Genio(3), C. Porco(4), S. Seager(5) (1)Mount Stromlo Obs., Australian National University (2)Southwest Research Institute, Boulder, USA (3)NASA Goddard Institute for Space Studies, NY, USA (4)Space Science Institute, Boulder, USA (5)DTM, Carnegie Institute at Washington, USA

2. Extrasolar planets: detection techniques Radial velocity of the star !!! Transits! Imaging Precise photometry (L p /L * ~10 -4 -10 -5 detectable now) … Radial velocity of the star !!! Transits! Imaging Precise photometry (L p /L * ~10 -4 -10 -5 detectable now) …

3. Phase light curve of the orbiting planet

4. Saturn as seen by Cassini spacecraft Surface scattering properties measured by Pioneer and Voyager spacecraft

5. Modeled phase light curves (edge-on) Full-disk albedo (L p /L * )X (Planet radius)²/(Orbital distance) ²

6. Modeled phase light curves (incl. 45 o ) Full-disk albedo (L p /L * )X (Planet radius)²/(Orbital distance) ²

7. Modeled phase light curves (face-on) Full-disk albedo (L p /L * )X (Planet radius)²/(Orbital distance) ²

8. Observer’s azimuth relative to the rings (0  - rings edge-on) 55 45  90  1 1 0 0 1 0

9. Jupiter versus Saturn ( orbit seen edge-on ) Azimuth of the planet along the orbit 0  180  360  0.4 0.2 Full-disk albedo (Lp/L*)X (Planet radius)²/(Orbital distance) ² For Saturn at 1 AU : 1.6 X 10 -7 Jupiter Saturn (no rings)

10. Conclusion: If the extrasolar planets have rings, they will be detectable.