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S19A0011abst

S19A0011

We propose follow-up high-contrast imaging for an intriguing young system of CI Tau, using Subaru/SCExAO+CHARIS in broad-band mode. This intriguing target has a lot of signatures of outer companions; an eccentric hot Jupiter, a gap in its protoplanetary disk, and a pair of spiral structures. Previously we observed CI Tau with HiCIAO+AO188 and detected a point-like source at 0.15β€²β€². At that time we regarded this as a speckle noise because of its blurred PSF, but considering these premising features we need to confirm whether this source is a planet signal or not. The expected contrast of the possible source is about ∼10βˆ’3, which is achievable with our proposed observation in the median conditions. Our observation and data reduction schematic requires sufficient field rotation and thus we require the former half night between February 1–9. The latest ALMA archival, which was released just in August 2018, has shown intriguing disk structures in CI Tau and follow-up observation of this system is urgent. A confirmation of the point source will be a great discovery of very young planet and multiple planetary system. Even if we do not detect any companion candidates, detection limits will be a direct and crucial constraint on migration mechanism of the inner planets.

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