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- W4317551323 abstract "HD$,$172555 is a young ($sim$20$,$Myr) A7V star surrounded by a 10$,$au wide debris disk suspected to be replenished partly by collisions between large planetesimals. Small evaporating transiting bodies, exocomets, have also been detected in this system by spectroscopy. After $beta,$Pictoris, this is another example of a system possibly witnessing a phase of heavy bombardment of planetesimals. In such system, small bodies trace dynamical evolution processes. We aim at constraining their dust content by using transit photometry. We performed a 2-day-long photometric monitoring of HD$,$172555 with the CHEOPS space telescope in order to detect shallow transits of exocomets with a typical expected duration of a few hours. The large oscillations in the lightcurve indicate that HD$,$172555 is a $delta,$Scuti pulsating star. Once removing those dominating oscillations, we find a hint for a transient absorption. If fitted with an exocomet transit model, it corresponds to an evaporating body passing near the star at a distance of $6.8pm1.4,$R$_star$ (or $0.05pm 0.01,$au) with a radius of 2.5 km. These properties are comparable to those of the exocomets already found in this system using spectroscopy, as well as those found in the $beta,$Pic system. The nuclei of solar system's Jupiter family comets, with radii of 2-6$,$km, are also comparable in size. This is the first evidence for an exocomet photometric transit detection in the young system of HD$,$172555." @default.
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- W4317551323 date "2023-01-18" @default.
- W4317551323 modified "2023-09-30" @default.
- W4317551323 title "Hint of an exocomet transit in the CHEOPS lightcurve of HD 172555" @default.
- W4317551323 doi "https://doi.org/10.48550/arxiv.2301.07418" @default.
- W4317551323 hasPublicationYear "2023" @default.
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