Phase Light Curves for Extrasolar Jupiters and Saturns U. Dyudina(5/1), P.Sackett(1), D. Bayliss(1), L Dones(2), H. Throop (2), C. Porco(3), S. Seager(4)

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Phase Light Curves for Extrasolar Jupiters and Saturns U. Dyudina(5/1), P.Sackett(1), D. Bayliss(1), L Dones(2), H. Throop (2), C. Porco(3), S. Seager(4) (1)Mount Stromlo Obs., Australian National University (2)Southwest Research Institute, Boulder, USA (3)Space Science Institute, Boulder, USA (4)DTM, Carnegie Institute at Washington, USA (5)Caltech U. Dyudina(5/1), P.Sackett(1), D. Bayliss(1), L Dones(2), H. Throop (2), C. Porco(3), S. Seager(4) (1)Mount Stromlo Obs., Australian National University (2)Southwest Research Institute, Boulder, USA (3)Space Science Institute, Boulder, USA (4)DTM, Carnegie Institute at Washington, USA (5)Caltech ApJ 618: , Jan. 2005

Method. Model reflected light from extrasolar planets (as if they were Jupiter or Saturn) Rings? (yes!) Inclination? (often yes) Clouds? (sometimes) Model reflected light from extrasolar planets (as if they were Jupiter or Saturn) Rings? (yes!) Inclination? (often yes) Clouds? (sometimes) Can we detect: Dyudina, et al. ApJ 618: Jan. 2005

Full-disk albedo (Lp/L * )X (Planet radius)²/(Orbital distance) ² For Saturn at 1 AU : 1.6 X Azimuth of the planet along the orbit (deg.) Jupiter versus Saturn (orbit seen edge-on ) Dyudina, et al. ApJ 618: Jan. 2005

Full-disk albedo (L p /L * )X (Planet radius)²/(Orbital distance) ² Dyudina, et al. ApJ 618: Jan Modeled phase light curves (incl. 45 o )

Dyudina, et al. ApJ 618: Jan, 2005 Light curves for various geometries with and without rings.

Inclination: i=0° (face on) Eccentric orbits. No rings Dyudina, et al. ApJ 618: Jan. 2005

Inclination: i=10° Dyudina, et al. ApJ 618: Jan. 2005

Inclination: i=45° Dyudina, et al. ApJ 618: Jan. 2005

Inclination: i~90° (edge on) Dyudina, et al. ApJ 618: Jan. 2005

Argument of pericentre: ω=0° To observer Observer’s aziuth Dyudina, et al. ApJ 618: Jan. 2005

To observer Argument of pericentre: ω=-90° Dyudina, et al. ApJ 618: Jan. 2005

To observer Argument of pericentre: ω=90° Dyudina, et al. ApJ 618: Jan. 2005

Example - HD b Extra solar planet discovered by Pepe, Mayor, et al (2002, A&A, 388, 632). Properties: –Semi-major axis = AU –Period = 10.9 days –Eccentricity = –Inclination = ? Dyudina, et al. ApJ 618: Jan. 2005

Light curve for HD b with Jupiter’s surface Dyudina, et al. ApJ 618: Jan pericentre

Light curve for HD b viewed at different azimuth contrast t-shift Dyudina, et al. ApJ 618: Jan pericentre –Argument of pericentre = -41°

Observable contrast for ringless planets at different geometries Dyudina, et al. ApJ 618: Jan. 2005

Light curve for HD b viewed at different azimuth contrast t-shift Dyudina, et al. ApJ 618: Jan pericentre

Observable t-shift for ringless planets at different geometries Dyudina, et al. ApJ 618: Jan. 2005

Rings? (yes!) Inclination? (often yes on eccentric orbits) Clouds? (sometimes on eccentric orbits) With light curves can we detect: : : Use of our predictions for planning observations Planet’s luminosity for many geometries Effects of Jupiter’s versus Saturn’s clouds