An alien planet lost its atmosphere to a giant impact

I note an important statement here in the report. "The scientists quickly ruled out a scenario in which the carbon monoxide arose from the debris of a newly formed star. Prior work suggested carbon monoxide would scarcely last beyond the first 3 million years of a star's life, much less HD 172555's age of 23 million years."

My observation. There is no direct observation of a giant impact event. The CO gas observed has a short lifetime relative to the postulated age of 23 million years for the star. This looks more like a model for reconciling different ages obtained in the system using a postulated giant impact. It is interesting.
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