Poster Open Access
A Terrestrial-mass Planet Orbiting GJ 1151: The Possible Source of Coherent Low-frequency Radio Emission from an Inactive Star
Stefansson, Gudmundur;
Mahadevan, Suvrath;
Robertson, Paul;
Terrien, Ryan;
Ninan, Joe;
Holcomb, Rae;
Halverson, Samuel;
Cochran, William;
Kanodia, Shubham;
Ramsey, Lawrence;
Wolszczan, Alexander;
Endl, Michael;
Bender, Chad;
Diddams, Scott;
Frederick, Connor;
Hearty, Frederick;
Monson, Andrew;
Metcalf, Andrew;
Roy, Arpita;
Schwab, Christian
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 2.02-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.
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- Publication date:
- February 25, 2021
- DOI:
-
- Keyword(s):
- Very low mass stars exoplanets
- Meeting:
- The 20.5th Cambridge Workshop on Cool Stars, Stellar Systems, and the Sun (CS20.5), virtually anywhere, March 2-4, 2021
- Communities:
- License (for files):
- Creative Commons Attribution 4.0 International