Very good and interesting report here. I note "Three of the four newfound worlds are gaseous planets slightly smaller than Neptune. The fourth is a super-Earth, a rocky planet a bit larger than our own, the researchers said. All four exoplanets lie very close to HD 108236; their orbital periods range from just under four Earth days to 19.5 Earth days. For perspective: Our solar system's innermost planet, Mercury, completes one lap around the sun every 88 days."
This site has 5 exoplanets orbiting HD 108236 star,
https://exoplanetarchive.ipac.caltech.edu/index.html, example, b-f.
https://exoplanetarchive.ipac.calte...p=ExoTbls&config=PS&constraint=default_flag=1
From another report, TESS Discovery of a Super-Earth and Three Sub-Neptunes Hosted by the Bright, Sun-like Star HD 108236,
https://iopscience.iop.org/article/10.3847/1538-3881/abd73e, “Abstract We report the discovery and validation of four extrasolar planets hosted by the nearby, bright, Sun-like (G3V) star HD 108236 using data from the Transiting Exoplanet Survey Satellite (TESS)..."
My observation. A super-earth with 1.586 earth radii, mean density model = 5.5 g cm^-3 (my guess), mass = 4 earth masses. Exoplanet systems like this make studying exoplanets fun
The host star is a G3V and has a solar system very different than our Sun, G2V star.
Here is a report reviewing how our solar system formed. 'What did the solar system look like before all the planets migrated?',
https://phys.org/news/2021-01-solar-planets-migrated.html
Cataclysmic bashing from giant planets occurred early in our Solar System's history,
https://www.sciencemag.org/news/202...nets-occurred-early-our-solar-systems-history, “An early maelstrom shaped our Solar System. Sometime after the planets took shape from primordial gas and dust, resonant tugs between the giant planets threw their orbits out of kilter. The gravity of the errant giants blasted Pluto and its many icy neighbors into the far-out Kuiper belt. The instability also scattered oddball moons and asteroids and triggered smaller bodies to pummel the inner planets. Now, that scenario is experiencing some upheaval of its own..."
My observation. Early catastrophism needed to *create* our solar system
It is apparent when we compare reports for exoplanets around HD 108236 solar system and our own solar system, catastrophism can be very selective it appears
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