A Terrestrial-mass Planet Orbiting GJ 1151: The Possible Source of Coherent Low-frequency Radio Emission from an Inactive Star

Gudmundur Stefansson, Suvrath Mahadevan, Paul Robertson, Ryan Terrien, Joe Ninan, Rae Holcomb, Samuel Halverson, William Cochran, Shubham Kanodia, Lawrence Ramsey, Alexander Wolszczan, Michael Endl (+8 others)
2021 Zenodo  
The coherent low-frequency radio emission detected by LOFAR from the quiescent M4.5 dwarf star GJ 1151 is consistent with theoretical expectations of star-planet interactions for an Earth-sized planet on a 1-5 day orbit. Using precise near-infrared radial velocities (RVs) with the Habitable-zone Planet Finder (HPF) on the 10m Hobby-Eberly Telescope at McDonald Observatory along with literature RVs from HARPS-N, we reveal a periodic Doppler signature consistent with a 2.5 Earth mass planet in a
more » ... .02-day orbit. Precise photometry from the Transiting Exoplanet Survey Satellite (TESS) shows no flares or activity signature, consistent with a quiescent M dwarf. While no planetary transit is detected in the TESS data, a weak photometric modulation is detectable in the photometry at a ~2 day period. This independent detection of a planet signal with the RV technique adds further weight to the claim to one of the first detection of star-exoplanet interactions at radio wavelengths, and helps validate this emerging technique for the detection of exoplanets.
doi:10.5281/zenodo.4563180 fatcat:noeoxegxdfhl3bhwq7b5fyvkgi