Quasi-periodic Dimming of the ∼130 Myr-old Debris-Disk Hosting Star HD 240779 is not Persistent
Quasi-periodic Dimming of the ∼130 Myr-old Debris-Disk Hosting Star HD 240779 is not Persistent
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DOI：
10.3847/2515-5172/ac5b7c
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发表时间：
2022-03
期刊：
影响因子：
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通讯作者：
E. Gaidos
中科院分区：
文献类型：
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作者：
E. Gaidos
2018年末，TESS在光度测量中探测到了135Myr的AB Doradus移动星团成员HD 240779的准周期(1.5天)变暗(由恒星周尘埃引起)。两年后的类似观测没有显示出这样的信号，地面测光表明，该信号在2019年末没有出现。这表明尘埃的来源在2018年后并没有持续很长时间，例如，它是一颗被破坏的小行星，或者是天体产生的尘埃是周期性的，类似于开普勒探测到的正在蒸发的行星。
Quasi-periodic (1.5 days) dimming (by circumstellar dust) of the 135 Myr-old AB Doradus moving group member HD 240779 was detected in photometry by TESS in late 2018. Similar observations two years later show no such signal, and ground-based photometry indicate that the signal was absent in late 2019. This suggests that the source of the dust did not survive long after 2018, e.g., it was a disrupted planetesimal, or that dust production by the body is episodic, analogous to the “evaporating” planets detected by Kepler.