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

Benjamin J. S. Pope*, Megan Bedell, Joseph R. Callingham, Harish K. Vedantham, Ignas A. G. Snellen, Adrian M. Price-Whelan, Timothy W. Shimwell

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

4 Citations (Scopus)


The recent detection of circularly polarized, long-duration (>8 hr), low-frequency (∼150 MHz) radio emission from the M4.5 dwarf GJ 1151 has been interpreted as arising from a star-planet interaction via the electron cyclotron maser instability. The existence or parameters of the proposed planets have not been determined. Using 20 new HARPS-N observations, we put 99th-percentile upper limits on the mass of any close companion to GJ 1151 at M\sin i< 5.6M. With no stellar, brown dwarf, or giant planet companion likely in a close orbit, our data are consistent with detected radio emission emerging from a magnetic interaction between a short-period terrestrial-mass planet and GJ 1151 (

Original languageEnglish
Article number19
Number of pages5
JournalAstrophysical Journal Letters
Issue number2
Publication statusPublished - 20-Feb-2020


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