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AI summary · arXiv: 2301.07418v1 · astro-ph.EP

Hint of an exocomet transit in the CHEOPS lightcurve of HD 172555

F. Kiefer, V. Van Grootel, A. Lecavelier des Etangs, Gy. M. Szabó, A. Brandeker, C. Broeg, A. Collier Cameron, A. Deline,
and 67 more authorsG. Olofsson, T. G. Wilson, S. G. Sousa, D. Gandolfi, G. Hébrard, Y. Alibert, R. Alonso, G. Anglada, T. Bárczy, D. Barrado, S. C. C. Barros, W. Baumjohann, M. Beck, T. Beck, W. Benz, N. Billot, X. Bonfils, J. Cabrera, S. Charnoz, Sz. Csizmadia, M. B. Davies, M. Deleuil, L. Delrez, O. D. S. Demangeon, B. -O. Demory, D. Ehrenreich, A. Erikson, A. Fortier, L. Fossati, M. Fridlund, M. Gillon, M. Güdel, K. Heng, S. Hoyer, K. G. Isaak, L. L. Kiss, J. Laskar, M. Lendl, C. Lovis, D. Magrin, P. F. L. Maxted, M. Munari, V. Nascimbeni, R. Ottensamer, I. Pagano, E. Pallé, G. Peter, D. Piazza, G. Piotto, D. Pollacco, D. Queloz, R. Ragazzoni, N. Rando, F. Ratti, H. Rauer, C. Reimers, I. Ribas, N. C. Santos, G. Scandariato, D. Ségransan, A. E. Simon, A. M. S. Smith, M. Steller, N. Thomas, S. Udry, I. Walter, N. A. Walton
Original paper · DOI 10.1051/0004-6361/202245104 Submitted to arXiv on 18 Jan. 2023 A&A 671, A25 (2023) 12 pages, 10 figures, 5 tables, accepted for publication in A&A License: CC BY 4.0

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The essentials

  • HD 172555 is a young A7V star estimated to be around 20 million years old
  • It has a debris disk spanning about 10 astronomical units (AU) that is replenished in part by collisions between large planetesimals
  • The system hosts small evaporating transiting bodies known as exocomets, detected through spectroscopy
  • Researchers used transit photometry to detect shallow transits of exocomets with expected durations of just a few hours
  • They conducted a two-day-long photometric monitoring campaign using data from the CHEOPS space telescope
  • Analysis revealed that HD 172555 is actually a $\delta$ Scuti pulsating star exhibiting large oscillations in its brightness over time
  • Evidence for a transient absorption event was found after removing dominating oscillations, which could be attributed to an exocomet transit
  • The model suggests that this evaporating body passed near the star at a distance of $6.8\pm1.4\,$R$_\star$ (or $0.05\pm 0.01\,$au) with a radius estimated at around 2.5 km - properties consistent with those observed for exocomets previously detected in this system using spectroscopy and those found in the $\beta$ Pic system as well as Jupiter family comets in our own solar system.
  • This marks the first evidence for an exocomet photometric transit detection in HD 172555's young system and provides valuable insights into its dynamics and evolution.

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AI-generated keywords: HD 172555 exocomets debris disk $\beta$ Pictoris system CHEOPS

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  • Original abstract
HD 172555 is a young A7V star with an estimated age of around 20 million years. It is surrounded by a debris disk that spans about 10 astronomical units (AU) and is believed to be replenished in part by collisions between large planetesimals. The system has also been found to host small evaporating transiting bodies, known as exocomets, which have been detected through spectroscopy. This makes HD 172555 another example of a system that may have experienced a phase of heavy bombardment by planetesimals, similar to the well-known $\beta$ Pictoris system. To better understand the dust content of these small bodies and their role in the dynamical evolution of the system, researchers aimed to use transit photometry to detect shallow transits of exocomets with expected durations of just a few hours. They conducted a two-day-long photometric monitoring campaign using data from the CHEOPS space telescope. Analysis of the lightcurve revealed that HD 172555 is actually a $\delta$ Scuti pulsating star exhibiting large oscillations in its brightness over time. However, after removing these dominating oscillations, researchers found evidence for a transient absorption event that could be attributed to an exocomet transit. The model suggests that this evaporating body passed near the star at a distance of $6.8\pm1.4\,$R$_\star$ (or $0.05\pm 0.01\,$au) with a radius estimated at around 2.5 km - properties consistent with those observed for exocomets previously detected in this system using spectroscopy and those found in the $\beta$ Pic system as well as Jupiter family comets in our own solar system. This marks the first evidence for an exocomet photometric transit detection in HD 172555's young system and provides valuable insights into its dynamics and evolution.
Created on 08 Apr. 2023

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