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arXiv 1310.5397astro-ph.EP
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HAT-P-16 b在近紫外波段的光度观测

Photometric observation of HAT-P-16b in the near-UV

Kyle A. Pearson, Jake D. Turner, Thomas A. G. Sagan

摘要:

本文给出了热木星HAT-P-16 b在近紫外波段的第一条主凌日光变曲线。我们于2012年12月29日观测到该天体,目的是更新凌日星历,约束其行星参数并寻找磁场干扰。Vidotto等人(2011 a)假设,如果HAT-P-16 b的近紫外光曲线显示出与其光学光曲线相比的早期进入,而其出口保持不变,则HAT-P-16 b的磁场可以受到限制。然而,当我们使用60秒的步频和2.26毫等的平均测光精度时,我们在夜间的观测中没有发现早期的侵入。我们发现一个近紫外行星半径为Rp = 1.274 +-0.057RJup,这与它的近红外半径Rp = 1.289 +-0.066RJup一致(Buchhave等人,2010年)。我们开发了一个自动化的还原管道和建模包来处理我们的数据。数据简化包综合了一组IRAF脚本来校准图像和执行孔径测光。建模包利用Levenberg-Marquardt最小化算法来找到最小二乘最佳拟合,并利用差分进化马尔可夫链蒙特卡罗算法来找到最佳拟合的光变曲线。为了抑制两种拟合模型中的红噪声,我们使用残差排列(念珠)方法和时间平均方法。

英文摘要:

We present the first primary transit light curve of the hot Jupiter HAT-P-16b in the near-UV photometric band. We observed this object on December 29,2012 in order to update the transit ephemeris, constrain its planetary parameters and search for magnetic field interference. Vidotto et al. (2011a) postulate that the magnetic field of HAT-P-16b can be constrained if its near-UV light curve shows an early ingress compared to its optical light curve, while its egress remains unchanged. However, we did not detect an early ingress in our night of observing when using a cadence of 60 seconds and an average photometric precision of 2.26mmag. We find a near-UV planetary radius of Rp=1.274+-0.057RJup which is consistent with its near-IR radius of Rp=1.289+-0.066RJup (Buchhave et al., 2010). We developed an automated reduction pipeline and modeling package to process our data. The data reduction package synthesizes a set of IRAF scripts to calibrate images and perform aperture photometry. The modeling package utilizes the Levenberg-Marquardt minimization algorithm to find a least-squares best fit and a differential evolution Markov Chain Monte Carlo algorithm to find the best fit to the light curve. To constrain the red noise in both fitting models we use the residual permutation (rosary bead) method and time-averaging method.

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