Exocomets size distribution in the [Formula: see text] Pictoris planetary system.

Area of Science:

• Astronomy and Astrophysics
• Exoplanetary Science
• Planetary System Dynamics

Background:

• Beta Pictoris hosts a young planetary system (approx. 20 million years old) with a debris disk, planets, and minor bodies.
• Exocomets have been detected via spectroscopy for over 30 years, probing their gaseous components.
• Photometric observations offer a method to detect the dusty tails of transiting exocomets.

Purpose of the Study:

• To analyze Transiting Exoplanet Survey Satellite (TESS) photometric data for Beta Pictoris.
• To identify and quantify exocomet transits and their characteristics.
• To determine the size distribution of exocomets based on observed transit data.

Main Methods:

• Analysis of 156 days of TESS photometric data for Beta Pictoris.
• Identification of 30 exocomet transit events.
• Statistical analysis of absorption depth and number of events to derive size distribution.

Main Results:

• 30 exocomet transits were identified in the TESS dataset.
• The number of exocomet events follows a power law with absorption depth (N ∝ AD^-0.7).
• The differential comet size distribution is proportional to s^-3.7, similar to Solar System comets.

Conclusions:

• The dust tail size distribution of exocomets in the Beta Pictoris system is consistent with Solar System comets.
• This suggests common formation or evolutionary processes for comets across planetary systems.
• TESS data provides valuable insights into the dusty component of exocomet tails.