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gaia data release 3 documentation

10.10 Planetary transits 10.10.3 Processing steps 10.11 RR Lyrae stars

10.10.4 Quality assessment and validation

Verification

Candidates were further excluded by examining their parameters, such as orbital period, planet radius, and transit duration. In Gaia DR3 we only included candidates that were within the hot-Jupiter area of this parameter space, compared to known exoplanets.

Validation

Photometric validation was performed by examining light curves from TESS Full-Frame Image (FFI) data (Ricker et al. 2014), if available. As an example, the combined photometry of Gaia and TESS for source_id 3026325426682637824, now called Gaia-1b, can be seen in Figure 10.27, showing the exoplanetary transit.

Figure 10.27: Gaia $G$ , $G_{\rm RP}$ , $G_{\rm BP}$ , and TESS combined and normalized photometry for Gaia-1b, source_id 3026325426682637824: photometric time series (top panel), time series phase folded by the orbital period of 3.0525 days (middle panel), and a zoom-in of the transit phase (bottom panel).

This candidate was confirmed to be a hot Jupiter (see Gaia image of the week of 30 March 2021) by radial velocity measurements from the high-resolution spectrograph PEPSI (PI Klaus G. Strassmeier) at the Large Binocular Telescope observatory in Arizona (USA), courtesy of observing time from the Italian Director’s Discretionary Time program.