Multi-Color Simultaneous Photometry of the T-Tauri Star Having A Planetary Candidate CVSO 30

Abstract

We present three-band simultaneous observations of a weak-line T-Tauri star CVSO~30 (PTFO~8-8695), which is one of the youngest objects having a candidate transiting planet. The data were obtained with the Multicolor Simultaneous Camera for studying Atmospheres of Transiting exoplanets (MuSCAT) on the 188 cm telescope at Okayama Astrophysical Observatory in Japan. We observed the fading event in the $g_2^{\prime }$-, $r_2^{\prime }$-, and $z_{\mathrm{s},2}$-bands simultaneously. As a result, we find a significant wavelength dependence of fading depths of about 3.1\%, 1.7\%, 1.0\% for the $g_2^{\prime }$-, $r_2^{\prime }$-, and $z_{\mathrm{s},2}$-bands, respectively. A cloudless H/He dominant atmosphere of a hot Jupiter cannot explain this large wavelength dependence. Additionally, we rule out a scenario by the occultation of the gravity-darkened host star. Thus our result is in favor of the fading origin as circumstellar dust clump or occultation of an accretion hotspot.

arXiv comment6 pages, 3 figures, Accepted for PASJ Letters

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Cited by in corpus (7)

• Subaru/HiCIAO $H{K}_{\mathrm{s}}$ imaging of LkH$\alpha$ 330 - multi-band detection of the gap and spiral-like structures
• Evidence for Centrifugal Breakout around the Young M Dwarf TIC 234284556
• Evidence for planetary hypothesis for PTFO 8-8695b with five-year optical/infrared monitoring observations
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• YETI follow-up observations of the T Tauri star CVSO30 with transit-like dips