Hint of an exocomet transit in the CHEOPS light curve of HD 172555
2023
unknown
Zugriff:
HD 172555 is a young (∼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, that is exocomets, have also been detected in this system by spectroscopy. After β 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 δ 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±1.4R∗ (or 0.05±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 β 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.
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Hint of an exocomet transit in the CHEOPS light curve of HD 172555
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Autor/in / Beteiligte Person: | Kiefer, F. ; Van Grootel, V. ; des Etangs, A. L. ; Szabó, Gy M. ; Brandeker, A. ; Broeg, C. ; Collier Cameron, A. ; Deline, A. ; Olofsson, G. ; Wilson, T. G. ; Sousa, S. G. ; Gandolfi, D. ; Hebrard, G. ; Alibert, Y. ; Alonso, R. ; Anglada, G. ; Bárczy, T. ; Barrado, D. ; Barros, S. C.C. ; Baumjohann, W. ; Beck, M. ; Beck, T. ; Benz, W. ; Billot, N. ; Bonfils, X. ; Cabrera, J. ; Charnoz, S. ; Csizmadia, Szilard ; Davies, M. B. ; Deleuil, M. ; Delrez, L. ; Demangeon, O. ; Demory, B.O. ; Ehrenreich, D. ; Erikson, Anders ; Fortier, A. ; Fossati, L. ; Fridlund, Malcolm ; Gillon, Michaël ; Gudel, M. ; Heng, Kevin ; Hoyer, S. ; Isaak, K. ; Kiss, L.L. ; Laskar, J. ; Lendl, M. ; Lovis, C. ; Magrin, D. ; Maxted, P. ; Munari, M. ; Nascimbeni, Valerio ; Ottensamer, R. ; Pagano, I. ; Palle, E. ; Peter, G. ; Piazza, D. ; Piotto, Giampaolo P. ; Pollacco, D. ; Queloz, D. ; Ragazzoni, Roberto ; Rando, N. ; Ratti, F. ; Rauer, H. ; Reimers, C. ; Ribas, I. ; Santos, N. C. ; Scandariato, Gaetano ; Segransan, D. ; Simon, A.E. ; Smith, A. M.S. ; Steller, Manfred B. ; Thomas, N. ; Udry, S. ; Walter, I. ; Walton, N. A. |
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Veröffentlichung: | 2023 |
Medientyp: | unknown |
DOI: | 10.1051/0004-6361/202245104 |
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