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We present the discovery of NGTS-3Ab, a hot Jupiter found transiting theprimary star of an unresolved binary system. We develop a joint analysis ofmulti-colour photometry, centroids, radial velocity (RV) cross-correlationfunction (CCF) profiles and their bisector inverse slopes (BIS) to disentanglethis three-body system. Data from the Next Generation Transit Survey (NGTS),SPECULOOS and HARPS are analysed and modelled with our new blendfittersoftware. We find that the binary consists of NGTS-3A (G6V-dwarf) and NGTS-3B(K1V-dwarf) at <1 arcsec separation. NGTS-3Ab orbits every P = 1.675 days. Theplanet radius and mass are R_planet = 1.48+-0.37 R_J and M_planet = 2.38+-0.26M_J, suggesting it is potentially inflated. We emphasise that only combiningall the information from multi-colour photometry, centroids and RV CCF profilescan resolve systems like NGTS-3. Such systems cannot be disentangled fromsingle-colour photometry and RV measurements alone. Importantly, the presenceof a BIS correlation indicates a blend scenario, but is not sufficient todetermine which star is orbited by the third body. Moreover, even if no BIScorrelation is detected, a blend scenario cannot be ruled out without furtherinformation. The choice of methodology for calculating the BIS can influencethe measured significance of its correlation. The presented findings arecrucial to consider for wide-field transit surveys, which require wide CCDpixels (>5 arcsec) and are prone to contamination by blended objects. With TESSon the horizon, it is pivotal for the candidate vetting to incorporate allavailable follow-up information from multi-colour photometry and RV CCFprofiles.

Unmasking the hidden NGTS-3Ab: a hot Jupiter in an unresolved binary system