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arXiv 1809.06978astro-ph.EP
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解体行星K2-22b的大型地面观测活动

A Large Ground-Based Observing Campaign of the Disintegrating Planet K2-22b

Knicole D. Colón, George Zhou, Avi Shporer, Karen A. Collins, Allyson Bieryla, Néstor Espinoza, Felipe Murgas, Petchara Pattarakijwanich, Supachai Awiphan, Jame… 展开作者

Knicole D. Colón, George Zhou, Avi Shporer, Karen A. Collins, Allyson Bieryla, Néstor Espinoza, Felipe Murgas, Petchara Pattarakijwanich, Supachai Awiphan, James D. Armstrong, Jeremy Bailey, Geert Barentsen, Daniel Bayliss, Anurak Chakpor, William D. Cochran, Vikram S. Dhillon, Keith Horne, Michael Ireland, Lucyna Kedziora-Chudczer, John F. Kielkopf, Siramas Komonjinda, David W. Latham, Tom. R. Marsh, David E. Mkrtichian, Enric Pallé, David Ruffolo, Ramotholo Sefako, Chris G. Tinney, Suwicha Wannawichian, Suraphong Yuma

摘要:

我们提供了2016年12月至2017年5月期间收集的K2-22系统的45个地面光度观测数据,我们使用这些数据来研究正在解体的行星K2- 22 b的过境演变。最后一次观测是在2015年初,在这些新的观测中,我们在多个时期恢复了凌日,并测量了<1.5%的典型深度。我们发现,我们测量的凌日深度分布与2014年和2015年观测中测量的深度范围相当。这些新的观测结果也支持了K2- 22 b凌日形状和时间的持续变化,尽管凌日的整体浅度使得对这些凌日参数的详细分析变得困难。我们没有发现强有力的证据表明波长依赖的过境深度的时代,我们有同时覆盖在多个波长,虽然我们的堆叠Las Cumbres天文台收集的数据在几天到几个月的时间尺度是暗示了一个更深的过境在蓝色波长。我们鼓励继续对这个系统进行高精度的光度和光谱监测,以进一步限制演化的时间尺度,并帮助与其他少数已知的解体行星进行比较研究。

英文摘要:

We present 45 ground-based photometric observations of the K2-22 system collected between December 2016 and May 2017, which we use to investigate the evolution of the transit of the disintegrating planet K2-22b. Last observed in early 2015, in these new observations we recover the transit at multiple epochs and measure a typical depth of <1.5%. We find that the distribution of our measured transit depths is comparable to the range of depths measured in observations from 2014 and 2015. These new observations also support ongoing variability in the K2-22b transit shape and time, although the overall shallowness of the transit makes a detailed analysis of these transit parameters difficult. We find no strong evidence of wavelength-dependent transit depths for epochs where we have simultaneous coverage at multiple wavelengths, although our stacked Las Cumbres Observatory data collected over days-to-months timescales are suggestive of a deeper transit at blue wavelengths. We encourage continued high-precision photometric and spectroscopic monitoring of this system in order to further constrain the evolution timescale and to aid comparative studies with the other few known disintegrating planets.

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