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The Habitable-zone Planet Finder Detects a Terrestrial-mass Planet Candidate Closely Orbiting Gliese 1151: The Likely Source of Coherent Low-frequency Radio Emission from an Inactive Star

  • Authors: Suvrath Mahadevan, Gudmundur Stefánsson, Paul Robertson, Ryan C. Terrien, Joe P. Ninan, Rae J. Holcomb, Samuel Halverson, William D. Cochran, Shubham Kanodia, Lawrence W. Ramsey, Alexander Wolszczan, Michael Endl, Chad F. Bender, Scott A. Diddams, Connor Fredrick, Fred Hearty, Andrew Monson, Andrew J. Metcalf, Arpita Roy, and Christian Schwab

2021 The Astrophysical Journal Letters 919 L9.

  • Provider: AAS Journals

Caption: Figure 2.

(a) Available photometry from TESS from Sector 22, obtained in two orbits: TESS Orbits 51 and 52. The unbinned 2-minute TESS cadence is shown in black, and 30-minute bins are shown in blue. No transits are seen. (b) TESS photometry folded on the expected transit ephemeris from our best-fit RV fit. The red curve shows a nominal expected transit model if the planet was transiting. The data rule out such transits to a high degree of confidence. (c) TESS photometry of both orbits phased to the 2.02-day period of the RV planet shows a ∼100ppm sinusoidal amplitude. (d) Lomb–Scargle periodograms of (i) all available TESS photometry, (ii) photometry from Orbit 51, and (iii) photometry from Orbit 52. The data show clear peaks in and around the periodicity of the momentum dumps (6–7 days) and show hints of a moderately significant peak (false-alarm probability ∼1%) at the 2.02-day RV planet period.

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