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After <jats:italic>\u03b2<\/jats:italic> Pictoris, this is another example of a system possibly witnessing a phase of the heavy bombardment of planetesimals. In such a system, small bodies trace dynamical evolution processes. We aim to constrain 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 light curve indicate that HD 172555 is a <jats:italic>\u03b4<\/jats:italic> Scuti pulsating star. After removing those dominating oscillations, we found a hint of a transient absorption. If fitted with an exocomet transit model, it would correspond to an evaporating body passing near the star at a distance of 6.8\u00b11.4<jats:italic>R<\/jats:italic><jats:sub><jats:italic>\u2605<\/jats:italic><\/jats:sub> (or 0.05\u00b10.01 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 <jats:italic>\u03b2<\/jats:italic> Pic system. The nuclei of the Solar System's Jupiter family comets, with radii of 2-6 km, are also comparable in size. This is the first piece of evidence of an exocomet photometric transit detection in the young system of HD 172555.<\/jats:p>","DOI":"10.1051\/0004-6361\/202245104","type":"journal-article","created":{"date-parts":[[2023,1,18]],"date-time":"2023-01-18T08:59:49Z","timestamp":1674032389000},"page":"A25","source":"Crossref","is-referenced-by-count":18,"title":["Hint of an exocomet transit in the CHEOPS light curve of HD 172555"],"prefix":"10.1051","volume":"671","author":[{"given":"F.","family":"Kiefer","sequence":"first","affiliation":[]},{"given":"V.","family":"Van Grootel","sequence":"additional","affiliation":[]},{"given":"A.","family":"Lecavelier des Etangs","sequence":"additional","affiliation":[]},{"given":"Gy. 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