H-alpha Variability in PTFO8-8695 and the Possible Direct Detection of Emission from a 2 Million Year Old Evaporating Hot JupiterAuthors:Johns-Krull et alAbstract:We use high time cadence, high spectral resolution optical observations to detect excess H-alpha emission from the 2 - 3 Myr old weak lined T Tauri star PTFO8-8695. This excess emission appears to move in velocity as expected if it were produced by the suspected planetary companion to this young star. The excess emission is not always present, but when it is, the predicted velocity motion is often observed. We have considered the possibility that the observed excess emission is produced by stellar activity (flares), accretion from a disk, or a planetary companion; we find the planetary companion to be the most likely explanation. If this is the case, the strength of the H-alpha line indicates that the emission comes from an extended volume around the planet, likely fed by mass loss from the planet which is expected to be overflowing its Roche lobe.
Wednesday, September 21, 2016
PTFO8-8695b: the 2 Milion Year Old Hot Jupiter Already Dying (again)
Posted by Will Baird at 4:00 PM
Labels: comet-like world, disintegrating world, gas giants, giant planets, hot jupiters, PTFO 8-8695b, roche limits
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