Precise and frequent photometric follow-up studies of transit light curves are indispensable when accurately characterizing extrasolar planets. We present new multi-wavelength photometry of three transiting “Hot Jupiters” — TrES-3b, WASP-2b and HAT-P-30b (WASP-51b). Data were acquired from an 0.8 meter telescope at Tarleton State University. When combined with data from the literature, this allowed us to redetermine system parameters. GCX reduction pipeline and TAP - modeling and light curve fitting package was used to analyze the extracted light curves. Weighted mean values were used to estimate the parameters from BVRI filters for three exoplanetary systems and compared them with previous published results. From our study, TreS-3b with a mass of $M_p$ = 1.7730±0.02$M_{jup}$ and $R_p$ = 1.3047±0.04$R_{jup}$, appears to be 0.2±0.03$M_{jup}$ less massive than previously published by O’donovan et al. (2007) and Sozzetti et al. (2009), while HAT-P-30b, which has a mass of $M_p$ = 0.7006±0.041$M_{jup}$ and $R_p$ = 1.5109±0.0557$R_{jup}$ appears to be a bloated “Hot Jupiter”. Additionally, we compared the results of our broadband photometric analysis with previous studies to search for transit depth wavelength dependence. We found a flat spectrum across optical wavelengths (except WASP-2b in R-band) for TrES-3b and WASP-2b, indicating the presence of clouds in their atmospheres. HAT-P-30b had a significantly larger radius in B filter with $R_p$ = 1.613±0.05$R_{jup}$, resulting from $R_p$/$R_{\ast }$ = 0.1334±0.004, which was secondarily confirmed by the atmospheric scale height value, H = 1450±38km, indicating that HAT-P-30b is an inflated “Hot Jupiter”.

在准确表征太阳系外行星时，对凌日光曲线进行精确和频繁的光度跟踪研究是必不可少的。我们展示了三个凌日“热木星”——TrES-3b、WASP-2b 和 HAT-P-30b (WASP-51b) 的新多波长测光。数据来自塔尔顿州立大学的 0.8 米望远镜。结合文献中的数据，这使我们能够重新确定系统参数。GCX 减少管道和 TAP - 建模和光曲线拟合包用于分析提取的光曲线。加权平均值用于估计来自三个系外行星系统的 BVRI 滤波器的参数，并将它们与先前公布的结果进行比较。根据我们的研究，TreS-3b 的质量为${米}_{磷}$ = 1.7730±0.02${米}_{j你磷}$ 和 ${\mathrm{电阻}}_{磷}$ = 1.3047±0.04${\mathrm{电阻}}_{j你磷}$, 似乎是 0.2±0.03${米}_{j你磷}$比 O'donovan 等人先前发表的质量要小。(2007) 和 Sozzetti 等人。(2009)，而 HAT-P-30b 的质量为${米}_{磷}$ = 0.7006±0.041${米}_{j你磷}$ 和 ${\mathrm{电阻}}_{磷}$ = 1.5109±0.0557${\mathrm{电阻}}_{j你磷}$似乎是一颗臃肿的“热木星”。此外，我们将宽带光度分析的结果与之前的研究进行了比较，以寻找传输深度波长的相关性。我们发现 TrES-3b 和 WASP-2b 的整个光学波长（R 波段的 WASP-2b 除外）具有平坦的光谱，表明它们的大气中存在云。HAT-P-30b 在 B 过滤器中具有明显更大的半径${\mathrm{电阻}}_{磷}$ = 1.613±0.05${\mathrm{电阻}}_{j你磷}$, 产生于 ${\mathrm{电阻}}_{磷}$/${\mathrm{电阻}}_{＊}$ = 0.1334±0.004，由大气标高值H = 1450±38km二次证实，表明HAT-P-30b是一颗膨胀的“热木星”。