2021-10-16

Scientists uncover the fate of exoplanets with ultra short periods

By yqqlm yqqlm

For example, a high proportion of the discovered massive Jupiter like planets operate in the region very close to the star, which is contrary to the situation shown by the planetary formation model, which believes that giant planets should form in the outermost region of the protoplanetary disk. It is worth noting that the obvious excessive phenomenon of such planets is related to the observation deviation. The sensitivity of the equipment used to detect exoplanets is limited. At present, they can only easily identify huge exoplanets

Scientists uncover the fate of exoplanets with ultra short periods

that is, the orbits of large planets (mass and size) are very close to their stars. These characteristics ensure that when planets pass in front of stars, they will cover a large area of the stellar disk. In addition, they can also bring good gravity to stars. We can detect the existence of these giant planets by measuring the radial velocity of stars. In any case, this raises important questions about how these structures are formed and what the fate of these exoplanets with short orbital periods will be

a study published in the famous monthly journal of the Royal Astronomical Society (mnras) studied a subcategory of these abnormal planets called “ultra short period planets” (USP). These planets orbit their stars in a nearly circular orbit in less than one earth day, and may be locked by tides, that is, they always show the same face to the stars in their whole orbit, just as our moon is relative to the earth

studies conducted so far have shown that tidal locking can greatly or fundamentally change the structure and possible fate of planetary systems. Modeling the migration speed of exoplanets provides a better prediction model to understand the fate of these exoplanets. Such a model takes into account several effects related to stars and planets, and some exoplanets have been monitored for decades to measure the changes of their orbital periods

this work predicts the gradual change of transit cycles of two giant USP exoplanets wasp 19b and NGTs 10B, which orbit the star every 20 hours or so. These cycles indicate that they are very close to stars, so their surface temperatures are extremely high. The model of this work predicts that the former has higher orbital mobility and the latter has lower mobility. These predictions can be confirmed in the next decade