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Reflected starlight measurements will open a new path in the characterizationof directly imaged exoplanets. However, we still lack a population study ofknown targets amenable to this technique. Here, we investigate which of theabout 4300 exoplanets confirmed to date are accessible to the Roman SpaceTelescope's coronagraph (CGI) in reflected starlight at reference wavelengths$\lambda$=575, 730 and 825 nm. We carry out a population study and also addressthe prospects for phase-curve measurements. We used the NASA Exoplanet Archiveas a reference for planet and star properties, and explored the impact of theiruncertainties on the exoplanet's detectability by applying statisticalarguments. We define a planet as Roman-accessible on the basis of theinstrument inner and outer working angles and its minimum planet-to-starconstrast (IWA, OWA, $C_{min}$). We adopt for these technical specificationsthree plausible configurations labeled as pessimistic, intermediate andoptimistic. Our key outputs for each exoplanet are its probability of beingRoman-accessible ($P_{access}$), the range of observable phase angles, theevolution of its equilibrium temperature, the number of days per orbit that itis accessible and its transit probability. In the optimistic scenario, we find26 Roman-accessible exoplanets with $P_{access}$>25% and host stars brighterthan $V$=7 mag. This population is biased towards planets more massive thanJupiter but also includes the super-Earths tau Cet e and f which orbit neartheir star's habitable zone. A total of 13 planets are part of multiplanetsystems, 3 of them with known transiting companions, offering opportunities forcontemporaneous characterization. The intermediate and pessimistic scenariosyield 10 and 3 Roman-accessible exoplanets, respectively. We find thatinclination estimates (e.g. with astrometry) are key for refining thedetectability prospects.

astronomy and astrophysics

Catalogue of exoplanets accessible in reflected starlight to the Nancy  Grace Roman Space Telescope. A population study and prospects for phase-curve  measurements