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The number of multi-planet systems known to be orbiting their host stars withorbital periods that place them in mean motion resonances is growing. For themost part, these systems are in first-order resonances and dynamical studieshave focused their efforts towards understanding the origin and evolution ofsuch dynamically resonant commensurabilities. We report here the discovery oftwo super-Earths that are close to a second-order dynamical resonance, orbitingthe metal-poor ([Fe/H]=-0.43 dex) and inactive G2V star HD41248. We analysed 62HARPS archival radial velocities for this star, that until now, had exhibitedno evidence for planetary companions. Using our new Bayesian Doppler signaldetection algorithm, we find two significant signals in the data, with periodsof 18.357 days and 25.648 days, indicating they could be part of a 7:5second-order mean motion resonance. Both semi-amplitudes are below 3m/s and theminimum masses of the pair are 12.3 and 8.6Mearth, respectively. Oursimulations found that apsidal alignment stabilizes the system, and even thoughlibration of the resonant angles was not seen, the system is affected by thepresence of the resonance and could yet occupy the 7:5 commensurability, whichwould be the first planetary configuration in such a dynamical resonance. Giventhe multitude of low-mass multiplanet systems that will be discovered in thecoming years, we expect more of these second-order resonant configurations willemerge from the data, highlighting the need for a better understanding of thedynamical interactions between forming planetesimals.

Two Super-Earths Orbiting the Solar Analogue HD41248 on the edge of a 7:5 Mean Motion Resonance