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Sandbox Physics

AC21

Exoplanet day and night

Follow a warm parcel across the evening edge. Calculate how the globe emits, then compare its changing light with a fixed JWST observation.

  1. L1

    Seeing day and night on an unresolved planet

    How an unresolved planet reveals its bright dayside and warm nightside through changing infrared light.

  2. L1

    The areas that set a planet's temperature

    Derive planetary equilibrium temperatures from intercepted and emitted areas, then distinguish a parcel from a visible hemisphere.

  3. L2

    Follow a gas parcel into the night

    Follow a gas parcel through heating, advection and nonlinear cooling; derive the thermal timescale and the capacity-flow degeneracy.

  4. L3

    Add a globe's light to make a phase curve

    Derive hemisphere projection, secondary eclipses, Lambert reflection and the brightness-map null space.

  5. L3

    Replay the WASP-43b MIRI phase curve

    Replay fixed WASP-43b MIRI products, propagate a conditional harmonic posterior and examine ephemeris, map and thermal degeneracies.

  6. L4

    Read the chemistry, clouds and maps behind a phase curve

    Read pinned primary papers on hydrogen chemistry, WASP-43b clouds and occultation mapping, following their equations and figures.

Move the wind and follow its heat

Sources and calculation scope

  1. Nicolas B. Cowan and Eric Agol, A Model for Thermal Phase Variations of Circular and Eccentric Exoplanets

    arXiv:1011.0428v1, submitted 2010-11-01. Sections 2–3, equations 1–10; section 4, equation 13; section 6; figures 1 and 6.

  2. Nicolas B. Cowan and Eric Agol, Inverting Phase Functions to Map Exoplanets

    arXiv:0803.3622v1, submitted 2008-03-25. Section 2, equations 1–4; section 3.2, equation 7; figure 1.

  3. Nicolas B. Cowan and Eric Agol, The Statistics of Albedo and Heat Recirculation on Hot Exoplanets

    arXiv:1001.0012v2, revised 2010-12-20. Sections 1, 2.1 and 2.2; equation 3.

  4. Nikku Madhusudhan and Adam Burrows, Analytic Models for Albedos, Phase Curves, and Polarization of Reflected Light from Exoplanets

    arXiv:1112.4476v1, submitted 2011-12-19. Albedo definitions; section 3.1, equation 33 and figure 7; local illumination conventions checked against the hemisphere integral.

  5. Taylor J. Bell and Nicolas B. Cowan, Increased Heat Transport in Ultra-Hot Jupiter Atmospheres Through H2 Dissociation/Recombination

    arXiv:1802.07725v2, revised 2018-04-09. Sections 2.1–2.3, equations 1–8; figures 1–4.

  6. Taylor J. Bell et al., Nightside clouds and disequilibrium chemistry on the hot Jupiter WASP-43b

    arXiv:2401.13027v1, submitted 2024-01-23; dataset v1 published 2024-04-30. Main figures 1–4; Methods Observations and Data Reduction, PDF pages 12–21 including spectral binning, shadowed region, harmonics and Eureka v1 equations 1–7; Data Availability, PDF page 33. Published methods also checked for trimming and light-travel convention.

  7. Rodrigo Luger et al., STARRY: Analytic Occultation Light Curves

    arXiv:1810.06559v1, submitted 2018-10-15. Section 2.4, equation 16; section 3.1, equations 17–20; sections 3.2–3.3; section 4.2 and figure 5.

  8. Taylor James Bell and the 17 other named Zenodo creators, Products and Models for Nightside clouds and disequilibrium chemistry on the hot Jupiter WASP-43b

    Zenodo record 10525170, v1, published 2024-04-30. Original API metadata, archive directory, selected HDF5 arrays and attributes, S3/S4/S5 configuration and EPF.

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