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We present the first follow‐up study of the transiting system WASP‐41 after its discovery in 2011. The main goal of this paper is to refine the physical parameters of the system and search for possible signs of transit timing variations. The observations used for analysis were taken from the public archive of the Exoplanet Transit Database (ETD). Assuming three different limb darkening laws, we found the best‐fitting model and redetermined parameters of the system. Although system parameters obtained in this study were found to be in good agreement with the discovery study, the planetary radius determined here is notably smaller, namely 1.12+0.06 –0.07 RJup. The Safronov number Θ = 0.071 ± 0.002 and equilibrium temperature Teq = 1271 ± 50 K were also determined. Both values indicate that the planet WASP‐41b belongs to Class I of transiting planets. No significant transit timing variations were detected. (© 2015 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim) 相似文献
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为更好地了解和使用近岸海域水质模型,总结和比较了EFDC(environmentalfluiddynamics code)、WASP(waterqualityanalysissimulationprogram)和MIKE三种模型的概念、性能、优势和局限性,介绍了其在近岸海域的应用,强调了选用合适的模型和降低不确定性是减小模拟结果误差的重要保证,对近海水质模型进行了展望。分析表明, WASP和EFDC的扩展性和开发性较强, MIKE的选择性更大;虽然水质模型在近岸海域已有较多应用,但仍有较大的发展空间,可通过模型内部完善、新技术耦合以及应用范围拓宽等途径使近岸海域水质模型得到进一步发展。 相似文献
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池塘、河渠、水库是乡村流域水环境的重要组成.基于WASP模型,综合运用现场调查、GIS空间分析、污染负荷估算等方法,构建茅山地区李塔陈庄乡村流域的水质模拟模型.结果表明,主要水质指标的污染程度从高至低依次为总氮(TN)、总磷(TP)和高锰酸盐指数、氨氮.TN全年在不同水体中达到劣Ⅴ类的比例在52%~100%,而池塘、河渠的污染程度较为接近.夏、冬季,超过TP劣Ⅴ类限值的河渠占2%~6%,池塘占8%~14%,而流域中部乡村周边的池塘明显更为严重.负荷输入是模型主要不确定性因素,细化种植模式能够提高总体模拟效果,而禽畜散养与农村生活造成的污染则分别对池塘、河渠的水质影响更为明显.本研究建立了乡村流域多种水体在面源污染影响下的水质联系,能够为乡村水环境治理提供决策参考. 相似文献
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V. Granata V. Nascimbeni G. Piotto L. R. Bedin L. Borsato A. Cunial M. Damasso L. Malavolta 《Astronomische Nachrichten》2014,335(8):797-803
We present four new light curves of the transiting exoplanets WASP‐1b and HAT‐P‐20b, observed within the TASTE (The Asiago Search for Transit timing variations of Exoplanets) project. We re‐analyzed light curves from the literature in a homogeneous way, calculating a refined ephemeris and orbital‐physical parameters for both objects. WASP‐1b does not show any significant Transit Timing Variation signal at the 120 s level. As for HAT‐P‐20b, we detected a deviation from our re‐estimated linear ephemeris that could be ascribed to the presence of a perturber or, more probably, to a previously unnoticed high level of stellar activity. The rotational period of HAT‐P‐20 A that we obtained from archival data (Prot ≃ 14.5 d), combined with its optical variability and strong emission of Ca ii H & K lines, is consistent with a young stellar age (<1 Gyr) and support the hypothesis that stellar activity may be responsible of the measured deviations of the transit times. (© 2014 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim) 相似文献
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象山港围隔生态系水质模型研究 总被引：1，自引：0，他引：1
在美国环保局开发的WASP(the water quality analysis simulation program,水质分析模拟程序)中的概念模型基础上,运用系统动力学软件Stella9.0.2建立了适用于海洋围隔生态系水质动力学模型.模型包括浮游植物、磷循环、氮循环、碳生化需氧量-溶解氧4个模块,涉及叶绿素a、有机磷、无机磷、有机氮、氨氮、硝酸-亚硝酸盐氮、生化需氧量、溶解氧8个水质指标.利用2010年10月初象山港围隔生态实验数据进行了模型验证和参数率定工作,成功模拟了不同水温条件下围隔水质情况,并确定了30余个模型参数,展现了系统动力学模拟的优势,为揭示象山港海域生态系统的动力学机制,模拟和预测他的变化提供科学依据. 相似文献
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河流一维水质时空扩散动态模拟 总被引：1，自引：0，他引：1
提出了一种有效模拟、可视化河流一维水质时空动态变化趋势的方法:首先将研究区河流分段,根据流域水环境、水动力及排污状况,利用WASP7.4水质模拟模型模拟各河段水质动态变化情况,并将模拟结果输出为水质变化时间序列表,在ArcGIS的追踪分析扩展模块中与空间数据联结,实现了水质等级时空变化状况的动态显示,可为河流水质管理提供决策支持. 相似文献
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