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The 20th (and a half) Cambridge Workshop on Cool Stars, Stellar Systems, and the Sun
Published February 25, 2021 | Version v1
Poster Open

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

Creators

  • 1. Princeton University
  • 2. Penn State University
  • 3. University of California, Irvine
  • 4. Carleton College
  • 5. Jet Propulsion Laboratory
  • 6. University of Texas, Austin
  • 7. University of Arizona
  • 8. University of Colorado, Boulder
  • 9. Air Force Research Laboratory
  • 10. Space Telescope Science Institute
  • 11. Macquarie University

Description

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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stefansson_cool_stars_2021.pdf

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