Modeling distant planets has revealed that tidal forces generated by their parent stars can combine with intense radiation bombardment and strip away their...
An illustration of a red and yellow run in the top left of the screen. Three worlds are seen toward the right of the screen, two of which have leaking atmospheres. A scientist has learned more about the violent processes that rip atmospheres away from planets, finding that squashing and squeezing by a parent star can contribute to this process. The research, conducted by Guo Jianheng from the Yunnan Observatories of the Chinese Academy of Sciences, could help astronomers better determine which extrasolar planets, or "exoplanets," to look at more closely as they expand their search for life beyond the solar system. There are multiple ways planets can lose their atmospheres to space, including the upper atmosphere leaving the planet as a whole, called " hydrodynamic escape." This process is thought to be more extreme than the process by which our solar system's planets leak particles into space today, through "hydrodynamic escape," which causes a planet to lose mass while also impacting its climate and, thus, its habitability. Jianheng simulated atmosphere loss from low-mass exoplanets. In particular, Jianheng focused on the hydrodynamic escape atmosphere-loss mechanism and suggested a new classification method that can be used to understand this, and other, escape processes. Related: Possibly habitable Trappist-1 exoplanet caught destroying its own atmosphere Though it no longer occurs for the inner planets around the sun, in the early era of the solar system, hydrodynamic atmospheric escape may have actually occurred to planets like Venus and Earth. Had the process continued, our planet may have been left with only a thin,…