arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 1708.07589astro-ph.IMastro-ph.EP
收藏

分析系外行星相位曲线信息内容:朝向最佳观测策略

Analyzing Exoplanet Phase Curve Information Content: Toward Optimized Observing Strategies

Ben Placek, Daniel Angerhausen, Kevin H. Knuth

摘要:

二次日食和相位曲线揭示了系外行星大气的反射率和热量分布的信息。相位曲线由行星反射和热发射的光组成,对于圆形轨道,相位曲线在二次日食或轨道相位为0.5时达到峰值。物理机制已经被发现,它将相位曲线最大值的潮汐锁定在行星的右侧或左侧。这些机制包括云的形成和大气超自转,这两者都有助于将大气中的热亮热点或高反射亮点从亚恒星点转移出去。在这里,我们提出了一种优化观测策略的方法,以最大限度地获得有关行星大气的信息,同时最大限度地减少(假设)连续观测时间的目标,为日食和相位曲线。我们表明,我们可以增加占空比的观察,旨在测量相位曲线特性(振幅,相位偏移)的$50\%$为未来的平台,如CHEOPS和JWST。我们将这种方法应用于55-Cancri-e的斯皮策相位曲线的测试案例,该曲线显示其相位曲线最大值的东移,以及CHEOPS观测到的超短周期行星的模型生成观测。

英文摘要:

Secondary eclipses and phase curves reveal information about the reflectivity and heat distribution in exoplanet atmospheres. The phase curve is composed of a combination of reflected, and thermally emitted light from the planet, and for circular orbits the phase curve peaks during the secondary eclipse or at an orbital phase of 0.5. Physical mechanisms have been discovered which shift the phase curve maximum of tidally locked close in planets to the right, or left, of the secondary eclipse. These mechanisms include cloud formations, and atmospheric superrotation, both of which serve to shift the thermally bright hot-spot, or highly reflective bright spot, of the atmosphere away from the sub-stellar point. Here we present a methodology for optimizing observing strategies for both secondary eclipses and phase curves with the goal of maximizing the information gained about the planetary atmosphere while minimizing the (assumed) continuous observation time. We show that we can increase the duty cycle of observations aimed at the measurements of phase curve characteristics (Amplitude, Phase offset) by up to $50\%$ for future platforms such as CHEOPS and JWST. We apply this methodology to the test cases of the Spitzer phase curve of 55-Cancri-e, which displays an eastward shift in its phase curve maximum, as well as model-generated observations of an ultra-short period planet observed with CHEOPS.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑