FM1p.10 — Long-term transit observations for a hot Jupiter around a T-Tauri star

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Aug 10th at 6:00 PM until 7:30 PM

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Author(s): Norio Narita1, Masahiro Onitsuka2, Akihiko Fukui1, PEaCH team3

Institution(s): 1. National Astronomical Observatory of Japan, 2. SOKENDAI (The Graduate University for Advanced Studies), 3. University of Tokyo

PTFO 8-8695 (aka CVSO30) is an M3 weak-lined T-Tauri star in the Orion-OB1a/25-Ori star forming region. The age of CVSO30 is estimated as ~2.6 Myr (Briceno et al. 2005). van Eyken et al. (2012) reported a possible transiting hot Jupiter around this T-Tauri star. Thus CVSO30b is the first-discovered newborn hot Jupiter candidate. To characterize this planet, we have performed long-term transit observations for the hot Jupiter since 2012. In this presentation, we report our results including (1) J band transit light curves observed from 2012 to 2014 with ISLE on Okayama 188cm telescope, (2) simultaneous JHKs band transit light curve taken in 2012 with SIRIUS on IRSF 1.4m telescope, and (3) transit light curves for 1.3-2.3 micron taken in 2014 via multi-object spectro-photometry with MOIRCS on Subaru 8.2m telescope. Our observations indicate changes of transit shape, timing, duration in the three years, which may be explained by precession of the planetary orbit. We have also detected likely large-spot crossing events in 2014 season, providing insights on the relation between the stellar rotation and the planetary orbit.