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HD 158259: 6 Planets, Slightly Off-Tune

23 Apr 2020, 14:03 UTC
HD 158259: 6 Planets, Slightly Off-Tune ESO/L. Calçada

What an exceptional system the one around HD 158259 is! Here we have six planets, uncovered with the SOPHIE spectrograph at the Haute-Provence Observatory in the south of France, with the innermost world also confirmed through space-based TESS observations. Multiple things jump out about this system. For one thing, all six planets are close to, but not quite in, a 3:2 resonance. That ‘close to’ tells the tale, for researchers believe there are clues to the formation history of the system within their observations of this resonance.

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