论文标题
用立方体证明高精度光度法：55个cancri e的星星观察结果
Demonstrating high-precision photometry with a CubeSat: ASTERIA observations of 55 Cancri e
论文作者
论文摘要
Asteria（Arcsecond Space望远镜在天体物理学中启用研究）是6U Cubesat太空望远镜（10 cm x 20 cm x 30 cm，10 kg）。 Asteria的主要任务目标是展示两种关键技术，用于减少光度观察中系统噪声：高精度指向控制和高稳定的热控制。 Asteria在其主要任务期间表现出0.5弧秒指向稳定性的稳定性和$ \ pm $ 10 millikelvin的摄像机有效载荷，与Asteria的大小和质量类别中的其他航天器相比，指向和热性能的显着改善。 Asteria于2017年8月启动，并从2017年11月的国际空间站（ISS）部署。在主要任务（2017年11月至2018年2月）和随后的第一个扩展任务（2018年3月至2018年5月），进行了机会科学观察，其中包括在55 Cancri上收集了55 Cancri，exoplanet System a transit transit transit transit transity Super -Alectistity Super -Alectial -super -Alectial -super -Alectial -super -Alectial -super -Aexair -super -Aexair -super -Alectiactial transition collection。使用自定义管道来纠正CMOS检测器列依赖性增益变化，从而减少了55个CANCRI数据。 Markov链蒙特卡洛（MCMC）方法用于使用简单的基线模型同时降低光度法并拟合过境模型。 Asteria对已知的过境系外行星55（$ \ sim2 $〜\ partth）进行了边际检测，尺寸为$ 374 \ pm170 $ ppm的运输深度。这是立方体对系外行星传输的首次检测。超级地球55的成功检测表明，小的，廉价的航天器可以提供高精度的光度测量值。
ASTERIA (Arcsecond Space Telescope Enabling Research In Astrophysics) is a 6U CubeSat space telescope (10 cm x 20 cm x 30 cm, 10 kg). ASTERIA's primary mission objective was demonstrating two key technologies for reducing systematic noise in photometric observations: high-precision pointing control and high-stabilty thermal control. ASTERIA demonstrated 0.5 arcsecond RMS pointing stability and $\pm$10 milliKelvin thermal control of its camera payload during its primary mission, a significant improvement in pointing and thermal performance compared to other spacecraft in ASTERIA's size and mass class. ASTERIA launched in August 2017 and deployed from the International Space Station (ISS) November 2017. During the prime mission (November 2017 -- February 2018) and the first extended mission that followed (March 2018 - May 2018), ASTERIA conducted opportunistic science observations which included collection of photometric data on 55 Cancri, a nearby exoplanetary system with a super-Earth transiting planet. The 55 Cancri data were reduced using a custom pipeline to correct CMOS detector column-dependent gain variations. A Markov Chain Monte Carlo (MCMC) approach was used to simultaneously detrend the photometry using a simple baseline model and fit a transit model. ASTERIA made a marginal detection of the known transiting exoplanet 55 Cancri e ($\sim2$~\Rearth), measuring a transit depth of $374\pm170$ ppm. This is the first detection of an exoplanet transit by a CubeSat. The successful detection of super-Earth 55 Cancri e demonstrates that small, inexpensive spacecraft can deliver high-precision photometric measurements.
