By Sara Seager and Gabriela Mallén-Ornelas. Section3.1,equations1–4 specify depth, contact durations and the circular-orbit scale. The2002 manuscript was published in The Astrophysical Journal585,1038–1055(2003).
By Sara Seager and Dimitar Sasselov. The2000 study calculates transmission absorption through an atmospheric annulus and discusses how weak contrast and clouds affect sensitivity. The Astrophysical Journal537,916–921.