Transit SNR Calculator (ppt)

Computes the signal-to-noise ratio (SNR) of an exoplanet transit using transit depth, RMS scatter, and the number of in-transit and out-of-transit points (all values assumed in ppt where applicable).  * Methodology

 

Inputs

Results

White-noise in-vs-out (difference of means)
Transit SNR
Potential SNR (if OOT → ∞)
Effective points (Neff)
Depth / RMS
SNR = depth / ( RMS * sqrt( 1/N_in + 1/N_out ) )
Potential SNR (OOT → ∞) = (depth / RMS) * sqrt(N_in)
N_eff = (N_in * N_out) / (N_in + N_out)

Note: this assumes independent (white) noise. Time-correlated (“red”) noise can make the true significance lower.