Detection and Characterization of the Temperate Super-Earth Ross 318 b
G. Conzo, M. Moriconi, S. A. Corr^ea Jr
arXiv:2605.11123v1 Announce Type: new
Abstract: Ross~318 is an M3.5V red dwarf exhibiting significant magnetic activity and a stellar rotation period of $sim51.5$,d. In this work we present a systematic re-analysis of radial velocities (RV) from CARMENES and decade-long HIRES observations, integrated with TESS space-based photometry. We identify a terrestrial-mass planet, Ross~318,b, with an orbital period $P = (39.6299 pm 0.29)$,d and a minimum mass $Msin i = (6.21 pm 0.62)M_{oplus}$. The dynamical nature of the signal is confirmed by its temporal coherence over a 15-year baseline and its achromaticity between visible and near-infrared channels. TESS photometry from Sectors 18, 19, 24, and 25 (218.6,d total baseline, 66,983 cadences) reveals no transit at $P = 39.63$,d (FAP $> 10%$, BLS). An injection-and-recovery test demonstrates that a $2200$,ppm transit signal corresponding to a $1.74R_{oplus}$ body would have been detected with Signal-to-Pink-Noise Ratio SPNR $> 12$, ruling out a transiting geometry with high confidence. The orbital inclination is constrained to $i arXiv:2605.11123v1 Announce Type: new
Abstract: Ross~318 is an M3.5V red dwarf exhibiting significant magnetic activity and a stellar rotation period of $sim51.5$,d. In this work we present a systematic re-analysis of radial velocities (RV) from CARMENES and decade-long HIRES observations, integrated with TESS space-based photometry. We identify a terrestrial-mass planet, Ross~318,b, with an orbital period $P = (39.6299 pm 0.29)$,d and a minimum mass $Msin i = (6.21 pm 0.62)M_{oplus}$. The dynamical nature of the signal is confirmed by its temporal coherence over a 15-year baseline and its achromaticity between visible and near-infrared channels. TESS photometry from Sectors 18, 19, 24, and 25 (218.6,d total baseline, 66,983 cadences) reveals no transit at $P = 39.63$,d (FAP $> 10%$, BLS). An injection-and-recovery test demonstrates that a $2200$,ppm transit signal corresponding to a $1.74R_{oplus}$ body would have been detected with Signal-to-Pink-Noise Ratio SPNR $> 12$, ruling out a transiting geometry with high confidence. The orbital inclination is constrained to $i