Hot Stars Blast Away at gas Giants Until Only Their Rocky Cores Remain - by BrianKoberlein
In our solar system, we have two types of planets. Small, warm, rocky worlds populate the inner region, while the outer region has cold gas giants. Intuitively this makes a lot of sense. When the solar system was forming, the Sun’s light and heat must have pushed much of the gas toward the outer system, leaving heavier dust and rock to form the inner worlds. Giants could only grow in the cold, dark outer solar system. But we now know our solar system is more the exception than the rule.
One way to study warm gas planets is by looking at the distribution of known exoplanets. Currently, close orbiting planets are easier to detect than more distant ones, so we have plenty of examples of gas planets that closely orbit their stars. But as a recent study shows, there’s an interesting pattern when it comes to Neptune-sized worlds.Close orbiting warm Neptunes can be found around several stars, including A-type stars, which emit powerful ultraviolet and x-ray light.
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