Pergunta 3 2 pts The discovery of \"Hot Jupiters\" -massive gas giants orbiting
ID: 118005 • Letter: P
Question
Pergunta 3 2 pts The discovery of "Hot Jupiters" -massive gas giants orbiting at Mercury-like distances from their Sun- like host stars -came as a surprise to astronomers, because... .massive gas-giant planets in Mercury-like orbits around Sun-like stars should have been the most challenging planets for astronomers to detect, not the easiest .it is not possible for gas giant planets to persist for more than a few orbits so close to their Sun-like host stars o.it is not possible for gas giant planets to "displace" the terrestrial-like planets that probably formed in the inner solar systems around these Sun-like stars. .it is not possible for most Sun-like stars to host planetary systems of any sort. ..it is not possible for gas giant planets to form so close to their Sun-like host stars.Explanation / Answer
1) Massive gas-giant planet in murcury-like orbits around Sun like stars should have been the most challenging planet for astronomers to detect, not the easiest.
->it is not possible for gas giant planets to form so close to their Sun like host star
Explanation -
Hot Jupiter are a class of extra solar planets whose mass is equal to or greater than the mass of Jupiter and whose orbit is about 0.015 to 0.5 AU away from their star. These planets orbit their sun every two or three days and are absolutely getting roasted. We know that they couldn’t have formed there – they had to have formed farther out and migrated in, so what we’re still trying to understand are what are the forces that caused them to migrate in.
we have a couple of theories for how hot jupiters may have ended up in their present day orbits. One theory is, that after they formed, that they were still embedded in the gas disc where they formed, and maybe they interacted with the disc as such that it kind of torqued and pulled them and so that’s kind of an early migration theory.
There’s also a late migration theory version where when after the disc had gone away, these planets had interacted with a third body in the system, so maybe you had another distant massive planet or maybe you had a planet that was part of a binary star system, and those three body interactions excited a large orbital eccentricity in the innermost planet, and once it starts coming in closer to the star, the tides start to damp out the eccentricities, so what you end up with is something which is a gas giant planet in a very short period circular orbit.