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The recent detection of circularly polarized, long-duration (>8 hr)low-frequency (~150 MHz) radio emission from the M4.5 dwarf GJ 1151 has beeninterpreted as arising from a star-planet interaction via the electroncyclotron maser instability. The existence or parameters of the proposedplanets have not been determined. Using 20 new HARPS-N observations, we put99th-percentile upper limits on the mass of any close companion to GJ 1151 atMsini < 5.6 M earth. With no stellar, brown dwarf, or giant planet companionlikely in a close orbit, our data are consistent with detected radio emissionemerging from a magnetic interaction between a short-period terrestrial-massplanet and GJ 1151.

No Massive Companion to the Coherent Radio-Emitting M Dwarf GJ 1151