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TTV's (Causes (Stellar activity (B) (C) (Magnetic cycle varying…
TTV's
Causes
Second planet (A) (B)
Small enough to not be visible in the radial velocity of star (B)
Tidal forces (A)
Relativistic precession (A)
Proper motion and parallax (A)
Stellar activity (B) (C)
Magnetic cycle varying gravitation pull and period (B)
Star spots (C)
Rotation of apsidal line about star (B) (A)
Primarily from planet tidal bulge in hot jupiters
Light time delay (B)
Due to third body around the system causing rv of star
Binary system
Nodal procession
Exomoon or satellite(A)
Trojan planets (A)
Parallax and space motion (A)
Methods
Deviations from linear ephemeris (data table of positions at linear intervals) (B)
Model light curves (B)
dependancies
Period
epoch
rstar/Rp
a/rstar
inclination
limb darkening coefficients
(B) assumes 0 eccentricity
Chi squared
Use different stellar properties
Markov chain monte carlo
Spectrum of star for activity (B)
False positives?
Refs
(A) Exoplanet handbook
(B)
Kepler 19
(C)
Kepler 9
(D) handbook of exoplanets Agol
Has most maths in for actually working it out
Other
Sensitive to small resonance (B)
To look into
Lithwick 2012
Existing studies