The international group of scientists calculated how intensively exoplanets of the TRAPPIST-1 system was subjected to bombardments in the early stages of their existence. It was possible to do this by simulation, which showed, with what intensity of collisions with celestial bodies could be preserved a harmonious relationship between the orbital periods of the planets. The results of the study revealing the possibility of water existence published in the Nature Astronomy magazine.
Scientists have created a computer model of the phase of the bombing of the formation of planets in TrapPist-1 to study the impact that its planets could resist without losing harmony in the form of an orbital resonance. So, the time required to complete one appeal around the star is 1.5 days on the planet B and 19 days on the planet H. Eight “Years” on Planet B correspond to five years on planet C, three on planet d, two on planet E and so on.
Resonance orbits of planets, similar to Trappist-1, are formed when young planets in the protoplanetic disk of gas and dust move closer to their star. The resonance must be established before the disk disappearance, so the TrapPist-1 planets were formed quickly, in about one tenth of time, which was required to form the Earth. This means that the system has survived a minor meteoric bombard. Scientists emphasize that in this case the planets could get less volatile elements that could come in handy for the appearance of life.
One of the main differences with the Earth is that the planets could initially have a hydrogen atmosphere, and at the same time not to experience gigantic clashes like that led to the appearance of the Moon in the Earth. It can change the evolution of the subsoil of planets, degassing, the accumulation of water and other processes that matter to their future inhabitants.