Journal
ASTROPHYSICAL JOURNAL LETTERS
Volume 922, Issue 1, Pages -Publisher
IOP Publishing Ltd
DOI: 10.3847/2041-8213/ac33b4
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The study places the first constraints on binary planets and exomoons from Doppler monitoring of directly imaged exoplanets. At 95% confidence, companions orbiting the three planets with masses greater than 2 M-J and orbital periods shorter than 5 days were ruled out. The tightest constraints were achieved on moons orbiting HR 8799c, ruling out edge-on Jupiter-mass companions in periods shorter than 5 days and edge-on half-Jupiter-mass moons in periods shorter than 1 day.
We place the first constraints on binary planets and exomoons from Doppler monitoring of directly imaged exoplanets. We model radial velocity observations of HR 8799 b, c, and d from Ruffio et al. and determine upper limits on the m sin i of short-period binary planets and satellites. At 95% confidence, we rule out companions orbiting the three planets more massive than m sin i = 2 M-J with orbital periods shorter than 5 days. We achieve our tightest constraints on moons orbiting HR 8799c, where with 95% confidence we rule out out edge-on Jupiter-mass companions in periods shorter than 5 days and edge-on half-Jupiter-mass moons in periods shorter than 1 day. These radial velocity observations come from spectra with resolution 20 times lower than typical radial velocity instruments and were taken using a spectrograph that was designed before the first directly imaged exoplanet was discovered. Similar data sets from new and upcoming instruments will probe significantly lower exomoon masses.
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