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.

6 pages, 3 figures, Accepted for PASJ Letters

References in corpus (7)

• Achieving better than 1 minute accuracy in the Heliocentric and Barycentric Julian Dates
• The effect of red noise on planetary transit detection
• The Transit Light Curve Project. IX. Evidence for a Smaller Radius of the Exoplanet XO-3b
• Results of the ROTOR-program. II. The long-term photometric variability of weak-line T Tauri stars
• Predicting Photometric and Spectroscopic Signatures of Rings around Transiting Extrasolar Planets
• High-precision photometry by telescope defocussing. VII. The ultra-short period planet WASP-103
• Extinction law in the range 0.4-4.8 $\mu$m and the 8620 $\mathring{A}$ DIB towards the stellar cluster Westerlund 1

Cited by in corpus (5)

• 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
• Evidence that the planetary candidate CVSO30c is a background star from optical, seeing-limited data
• PTFO 8-8695: Two Stars, Two Signals, No Planet
• YETI follow-up observations of the T Tauri star CVSO30 with transit-like dips