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Capturing planets in the act of losing their atmospheres provides rareopportunities to probe their evolution history. Such analysis has been enabledby observations of the helium triplet at 10833 \AA, but past studies havefocused on the narrow time window right around the planet's optical transit. Wemonitored the hot Jupiter HAT-P-32 b using high-resolution spectroscopy fromthe Hobby-Eberly Telescope covering the planet's full orbit. We detected heliumescaping HAT-P-32 b at a $14\sigma$ significance, with extended leading andtrailing tails spanning a projected length over 53 times the planet's radius.These tails are among the largest known structures associated with anexoplanet. We interpret our observations using three-dimensional hydrodynamicsimulations, which predict Roche Lobe overflow with extended tails along theplanet's orbital path.

Giant Tidal Tails of Helium Escaping the Hot Jupiter HAT-P-32 b