Warm spitzer phase variations of wasp 12b defying predictions
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WARM SPITZER PHASE VARIATIONS OF WASP-12B: DEFYING PREDICTIONS. Nick Cowan CIERA Postdoctoral Fellow Northwestern University September 15 th 2011. with Louis Shekhtman (NU undergrad) Machalek, Croll, Burrows, Deming. WASP-12b: a Tortured World. ~1 day orbit: Oblate Planet

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WARM SPITZER PHASE VARIATIONS OF WASP-12B: DEFYING PREDICTIONS

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Warm spitzer phase variations of wasp 12b defying predictions

WARM SPITZER PHASE VARIATIONS OF WASP-12B: DEFYING PREDICTIONS

Nick Cowan

CIERA Postdoctoral Fellow

Northwestern University

September 15th 2011

with Louis Shekhtman (NU undergrad)

Machalek, Croll, Burrows, Deming


Wasp 12b a tortured world

WASP-12b: a Tortured World

  • ~1 day orbit: Oblate Planet

  • Tidally Warped: Prolate Planet

  • Tday≈3000 K: MHD Effects

  • Big Rp, small a:

    Roche-Lobe Overflow

  • Accretion on Star/ Bow Shock

  • Peculiar Eclipse Depths:

    High C/O ratio

    (Hebb et al. 2009; Ragozzine & Wolf 2009; Li et al. 2010; Lai et al. 2011; Leconte et al. 2011; Fossati et al. 2010; Vidotto et al. 2010; Llama et al. 2011; Madhusudhan et al. 2011)

    Check Out These Posters:

    Crossfield 40.08

    Petigura 33.03

    Moses 40.04

Li et al. (2010)

Nick Cowan's Talk at ESS II


Thermal ellipsoidal variations

Thermal + Ellipsoidal Variations

Brightness Phases:

Planet Light

  • Optical Light Observations

  • Reflected Light Dominates Phases

  • Star’s Shape Dominates Geometry

  • Infrared Observations

  • Thermal Emission Dominates Phases

  • Planet’s Shape Dominates Geometry

Geometrical Phases:

Projected Area

HAT-P-7b as seen by Kepler

(Welsh et al. 2010)

Nick Cowan's Talk at ESS II


Raw wasp 12b photometry

Raw WASP-12b Photometry

Phase Function

Eclipse

Eclipse

3.6 micron

4.5 micron

Transit

Intra-pixel sensitivity variations

are the dominant systematic

Gaussian Decorrelation (Ballard et al. 2010)

Polynomial in Centroid x and y

Nick Cowan's Talk at ESS II


Wasp 12b at 3 6 micron

WASP-12b at 3.6 micron

Atherm/<Fp> = 0.9(3)

max = -53(7)°

Nick Cowan's Talk at ESS II


What planets are supposed to do

What Planets Are Supposed To Do

Increasing Heat Capacity

1) Decreases Thermal Phase Amplitude

2) Increases Hot Spot Offset

Noon

SOP

Dawn

SOP

Midnight

SOP

Dusk SOP

Cowan & Agol (2011a)

Nick Cowan's Talk at ESS II


Wasp 12b at 3 6 micron1

WASP-12b at 3.6 micron

Atherm/<Fp> = 0.9(3)

max = -53(7)°

Aellips = 2(2)x10-4

Nick Cowan's Talk at ESS II


Wasp 12b at 4 5 micron

WASP-12b at 4.5 micron

Atherm/<Fp> = 0.7(1)

max = -16(4)°

The Null Hypothesis

Consistent with Cowan & Agol (2011a) Toy Model

Aellips = 1.2(2)x10-4

Nick Cowan's Talk at ESS II


Interpreting ellipsoidal variations

Interpreting Ellipsoidal Variations

most of cos(2) due to geometry

cos(2) all due to geometry

Spherical planet

4.5 micron phase variations

Phases

Geometry

Temperature profile is cos(- 0)

But applying Cowan & Agol (2008) deconvolution

leads to unphysical longitudinal brightness map

Brightness

All of cos(2) due to temperature

some of cos(2) due to temperature

Nick Cowan's Talk at ESS II


Day side emergent spectrum

Day-Side Emergent Spectrum

Null Hypothesis

(Campo et al. 2010)

This Study

(López- Morales et al. 2010)

(Croll et al. 2011)

Day-Side 1D Model Spectra

(Burrows et al. 2007, 2008)

Nick Cowan's Talk at ESS II


Transmission spectrum

Transmission Spectrum

Transit Spectrum Assuming

Day-Like T-P Profile

(Burrows et al. 2007, 2008)

(Maciejewski et al. 2011)

(Chan et al. 2011)

Nick Cowan's Talk at ESS II


Choose your own adventure

Choose Your Own Adventure

1. Prediction-Buster

Roche-Lobe Opaque at 4.5 m + Gravity Brightened Terminator

Weird Composition (not just high C/O)

2. Null Hypothesis

Ellipsoidal Variations As Predicted

Solar Composition?

Nick Cowan's Talk at ESS II


Wasp 12b power budget

WASP-12b Power Budget

Eclipse Observations

AB ≈ 0.25

 ≈ rad/(adv +rad) ≈ 0.1

Phase Observations

Hot Planets are Poor Recirculators (Cowan & Agol 2011b)

Magnetic Drag (Perna et al. 2010, Menou 2011)

Short Radiative Timescale (rad ≈ T-3)

Nick Cowan's Talk at ESS II


Exoclimes 2012 aspen co jan 16 20 2012

EXOCLIMES 2012Aspen, COJan 16-20, 2012

Registration Open

www.aspenphys.org

Nick Cowan's Talk at ESS II


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