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2021-11-04 20:15:29
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# 2110.13754 - https://arxiv.org/abs/2110.13754 - **X-ray irradiation of three planets around Hyades star K2-136** - K2-136 is a K-type star in the star cluster Hyades. It has three planets, K2-136 b is earth-sized, K2-136 c is like a mini Neptune and K2-136d is a super-Earth. The author analysised the XMM-Newton X-ray spectrum of the star, which is invloved in modeling the evolution history for the planets. As a result, planets b and d is rocky, while planet c seems to have an evelope with 0.8% of its total mass. - by **胡祯崧** # NA - https://www.nature.com/articles/s41550-021-01495-w - **A possible planet candidate in an external galaxy detected through X-ray transit** - They report the discovery of a possible planet-transit event in the X-ray binary M51-ULS-1 in the galaxy M51. According to the phase-resovled spectrum and eclipsing properties, other possibilities, such as accretion-related dips and intrinsic variability are rule out. The transit model highly suggest the eclipser is most likely to be the size of Saturn. - by **鲍通** # 2111.01489 - https://arxiv.org/abs/2111.01489 - **Probabilistic classification of X-ray sources applied to Swift-XRT and XMM-Newton catalogs** - by **黄健** #
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