Transiting planets – light-curve analysis for eccentric orbits

Transiting planets – light-curve analysis for eccentric orbits
复制标题

凌日行星——偏心轨道的光曲线分析

DOI:
10.1111/j.1365-2966.2008.13658.x
复制
发表时间:
2008
影响因子:
4.8
通讯作者:
D. Kipping
D. Kipping
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
D. Kipping

文献摘要

被引文献

相似文献

A B ST R A C T凌日行星光曲线在历史上主要用于测量行星-恒星半径的深度和增密比p。Seager& M allOrnelas(2003)先前提出了用于分析总凌日光曲线和谷凌日光曲线的方程,以导出在圆轨道情况下半米主轴线与恒星半径的比值a=R λ。这里,提出了一种新的分析模型,它适用于偏心轨道的一般情况。i)光变曲线解的简并性(e > 0)ii)光变曲线的不对称性和由此产生的中间渡越时间e的偏移,(3)偏心率对进出口边坡的影响,并指出偏心率和倾斜度变化的系统可能产生长周期的过渡时间变化(LTTV)。我们使用我们的odelinare分析HD209458 barchiveddatabyRichardson埃塔尔。(2006),其中包含了一致的艾德非零偏心率,导出了24 m的行星半径RP = 1:275 RJ-0:082 RJ(其中RJ = 1木星半径),比假设每个圆轨道的总和大1%。
A B ST R A C T Transitingplanetlightcurveshavehistorically been used predom inantly form easuring thedepth and henceratio oftheplanet-starradii, p.Equationshavepreviously been presented by Seager& M allOrnelas(2003)fortheanalysisofthetotaland trough transitlightcurvetim esto derivetheratio ofsem i-m ajoraxisto stellarradius, a=R�, in thecaseofcircularorbits.Here,anew analyticm odelisproposedwhich operatesfor them oregeneralcaseofan eccentricorbit.W eaim to investigatethreem ajoreects ourm odelpredicts:i)the degeneracy in transitlightcurve solutionsforeccentricity, e > 0 ii)the asym m etry ofthe lightcurve and the resulting shiftin the m id-transit tim e, TM ID iii) the eect ofeccentricity on the ingress and egressslopes.It is also shown thata system with changing eccentricity and inclination m ay produce a long periodtransittim evariation(LTTV ).Furtherm ore,weuseourm odelinareanalysisof HD209458barchiveddatabyRichardson etal.(2006),whereweincludetheconrm ed non-zeroeccentricity and derivea 24�m planetary radiusof RP = 1:275RJ�0:082RJ (where RJ = 1Jovian radius),which is � 1% largerthan ifweassum eacircularorbit.