The early Solar System was a chaotic place, as evidenced by the Moon’s cratered surface, which bears the scars of multiple collisions. In a new study, researchers simulated a collision between two massive planets to better understand the dynamics of such events in young solar systems.
Some massive exoplanets have cores that contain over 100 times the mass of Earth in solid material. These planets likely formed through a series of collisions and mergers with smaller exoplanets, each containing about 10 Earth masses. To study the effects of such collisions, astronomers simulated a scenario where a younger, smaller gas giant collided with an older, more massive gas giant.
The research, titled “Seismic Oscillations Excited by Giant Impacts in Directly-Imaged Giant Planets,” was led by J.J. Zanazzi, a theoretical physicist at UC Berkeley. The study aimed to determine if such impacts could generate long-lived seismic waves that could be detected by instruments like the James Webb Space Telescope (JWST).
While the JWST cannot directly detect seismic waves, it can observe changes in light with extreme precision. If the seismic waves generated by a giant impact are strong enough, the telescope could detect them through photometric changes in the giant planet.
The researchers focused on a specific exoplanet known as Beta Pictoris b, a young super-Jupiter with about 13 times the mass of Jupiter. By simulating a collision between a Neptune-mass planet with 17 Earth masses and Beta Pictoris b, they found that such impacts could lead to the accumulation of heavy metals in Jupiter-mass exoplanets.
The study suggests that seismic activity triggered by giant impacts could persist over timescales comparable to the age of a young planet. By monitoring the luminosity variations of exoplanets like Beta Pictoris b, the JWST could provide valuable insights into their internal structures.
In addition to probing exoplanet interiors, the researchers propose that their method could also be used to detect planetary migrations and study regions of stable stratification within giant planets. Ultimately, their work offers a new way to understand the formation and evolution of giant planets in other solar systems.
This article was originally published by Universe Today. For more information, you can read the original article on their website.
