Phase Light Curves for Extrasolar Jupiters and Saturns ASA meeting, July 6, 2004 U. Dyudina(1),...

Phase Light Curves for Extrasolar Jupiters and

Saturns

Phase Light Curves for Extrasolar Jupiters and

Saturns

ASA meeting, July 6, 2004ASA meeting, July 6, 2004

U. Dyudina(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

U. Dyudina(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

astro-ph/0406390astro-ph/0406390

Method.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:Can we detect:

Sackett, Dyudina, et al. astro-ph/0406390Sackett, Dyudina, et al. astro-ph/0406390

Phase light curve of the orbiting planetPhase light curve of the orbiting planet


Ful

l-di

sk a

lbed

o(L

p/L

*)X

(P

lane

t rad

ius)

²/(O

rbit

al d

ista

nce)

²F

or S

atur

n at

1 A

U :

1.6

X 1

0-7

Azimuth of the planet along the orbit (deg.)

Jupiter versus Saturn (orbit seen edge-on )Sackett, Dyudina, et al. astro-ph/0406390

Saturn as seen by Cassini spacecraftSaturn as seen by Cassini spacecraft

Surface scattering properties measured by Pioneer and Voyager spacecraft

Surface scattering properties measured by Pioneer and Voyager spacecraft


Ful

l-di

sk a

lbed

o

(Lp/

L*)

X (

Pla

net r

adiu

s)²/

(Orb

ital d

ista

nce)

²


Modeled phase light curves (edge-on)Modeled phase light curves (edge-on)

Ful

l-di

sk a

lbed

o

(Lp/

L*)

X (

Pla

net r

adiu

s)²/

(Orb

ital d

ista

nce)

²


Modeled phase light curves (incl. 45 o)Modeled phase light curves (incl. 45 o)

Ful

l-di

sk a

lbed

o

(Lp/

L*)

X (

Pla

net r

adiu

s)²/

(Orb

ital d

ista

nce)

²


Modeled phase light curves (face-on)Modeled phase light curves (face-on)

Sackett, Dyudina, et al. astro-ph/0406390

Light curves. Planet with rings at different geometries. -ring’s tilt to eclipticωr-observer’s azimuthi -orbital inclination

Inclination: i=0° (face on)

Eccentric orbits. No ringsSackett, Dyudina, et al. astro-ph/0406390Sackett, Dyudina, et al. astro-ph/0406390

Inclination: i=10°


Inclination: i=45°


Inclination: i~90° (edge on)


Argument of pericentre: ω=0°

To observer

Orientation of the orbital plane - Argument of Pericentre


To observer

Argument of pericentre: ω=-90°


To observer

Argument of pericentre: ω=90°


Example - HD 108147b

• Extra solar planet discovered by Pepe, Mayor, et al (2002, A&A , 388, 632).

• Properties:

– Semi-major axis = 0.104 AU

– Period = 10.9 days

– Eccentricity = 0.498

– Argument of pericentre = -41°

– Inclination = ?


Light curve for HD 108147b with Jupiter’s surface


pericentre pericentre

Light curve for HD 108147b viewed at different azimuth

contrast

t-shift



Contrast for e=0.6In

clin

atio

n (i

)

90

0-90

Scale at 1 AU (x10-7)

Argument of pericentre (ω)

090

100

10

1

0.1


Observable contrast for

ringless planets at different geometries


Light curve for HD 108147b viewed at different azimuth

contrast

t-shift



Observable t-shift

for ringless planets at different

geometries



Rings? (yes!)Inclination? (often yes)Clouds? (sometimes)

Rings? (yes!)Inclination? (often yes)Clouds? (sometimes)

With light curves can we detect:

With light curves can we detect:

::Use of our predictions for planning observations

Use of our predictions for planning observations

Planet’s luminocity for many geometriesEffects of Jupiter’s or Saturn’s cloudsPlanet’s luminocity for many geometriesEffects of Jupiter’s or Saturn’s clouds

Phase Light Curves for Extrasolar Jupiters and Saturns ASA meeting, July 6, 2004 U. Dyudina(1),...

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