benjaminpope.github.io/talks/mad/mad

Exoplanet-style transit light curve of Venus from James Gilbert on Vimeo.

The best options are those around bright stars, like 55 Cancri e - subject of 367 papers in the last decade!

Their frequencies tell us about stellar interior structure.

Power spectrum of the Sun's 5-minute oscillations

but the pixels have different gains ("inter- and intra-pixel sensitivity variation")...

and the pixel window doesn't necessarily track the whole PSF perfectly ("aperture losses").

Raw - GP in position - GP in time

By subtracting the GP time and spatial components, we can find a transiting planet!

We will be motivated by this here.

\[ f_i \equiv \sum\limits_i w_j p_{ij} \]

\[\begin{align} TV \equiv \dfrac{\sum_i |f_i - f_{i-1}|} {\sum_i f_i } \end{align} \]

This is the L1 norm on the derivative of the time series.

This has analytic derivatives in Theano - easy to optimize.

But they're sparse in the Fourier domain... perhaps this is relevant?

Πλειάδες, the Seven Sisters

Alcyone, Atlas (dad), Electra, Maia, Merope, Taygeta, Pleione (mum)

Atlas lightcurve: raw (top) and halo (bottom)

Lightcurves of All Seven Bright Pleiades

I am currently searching all bright stars in K2 for transiting planets - none so far, but plenty of asteroseismology!

We need your help to be able to understand and improve photometry tools.