What stats and follow-ups confirm Earth-size exoplanets in crowded fields?

[StephenP]

I'm an astronomy graduate student focusing on exoplanet detection methods, and I'm analyzing data from a transit survey that has several promising candidate signals. I'm currently working through the process of ruling out false positives like eclipsing binaries, which is more complex than I anticipated. For researchers experienced with transit photometry, what specific statistical tools or follow-up observation strategies (like radial velocity or high-resolution imaging) have you found most critical for confidently validating a terrestrial-sized exoplanet candidate in a crowded stellar field?

[Jonathan99]

Great topic. Start with solid vetting: check for odd-even transit depth and search for a secondary eclipse. That centroid motion test is key—if the transit centroid shifts toward another star, you might have a blend. Quantify false-positive probability with Vespa or a similar Bayesian vetting tool, then decide if you want to validate vs. confirm.