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Light curve of the week

23 Jan 2020, 17:05 UTC
Light curve of the week
(200 words excerpt, click title or image to see full post)

TESS looks at thousands of stars every night providing us with some of the most beautiful, strange and mysterious light curves. Here is my favourite one of the week: TIC 300446218.

This specific light curve was extracted from the TESS full frame images (FFIs) and it shows multiple dips of different depths. There appear to be two sets of alternating signals which have been highlighted in different colours. The signals highlighted with the red solid lines and the yellow dashed lines are equally spaces but have alternating depths (the yellow signal is deeper) and therefore look like they are caused by an eclipsing binary. Similarly, the signal highlighted by the blue dotted lines and the purple dot-dash lines are also periodic but have different depths. We are, therefore, likely seeing two sets of eclipsing binaries, which, if they are physically close together and tidally locked to one another, could be in a quadruple system!
TIC 300446218 is located close to the ecliptic pole, in the ‘continuous viewing zone’, and was continuously observed by TESS throughout the first year of operation. While the image above only shows a small segment of the light curve, you can see the entire coverage in ...

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