Mysterious 'hot Jupiter' planets can form quickly or slowly, Gaia spacecraft reveals

[Admin]

The Gaia spacecraft is helping to fill the gaps in our understanding of "hot Jupiters," mysterious, massive planets that orbit very close to their stars.

Mysterious 'hot Jupiter' planets can form quickly or slowly, Gaia spacecraft reveals : Read more

 

[Catastrophe]

Mysterious 'hot Jupiters' can form quickly or slowly | Space

Imgur: The magic of the Internet

The existence of "hot Jupiters" is one of the oldest mysteries of the exoplanet-hunting era, but a European spacecraft is revealing some clues about how these enigmatic worlds form.
So-called hot Jupiters are planets that are roughly as massive as Jupiter and orbit very close to their stars, usually less than one-tenth the distance at which Earth orbits the sun. Hot Jupiters are very different from anything seen in the solar system, posing questions about their formation

Cat :_

 

[rod]

This site shows 1552 exoplanets orbiting where semi-major axis 0.1 au or closer, The Extrasolar Planets Encyclopaedia (exoplanet.eu)

5106 are now listed as confirmed so 1552 is a bunch. Another interesting stat. When I selected using a < = 0.73 au (as close as Venus here or closer), I found 2516 exoplanets listed. That is a bunch too with average mass 2.5 Mjup and min a = 0.0026 au out to 0.73 au. There are plenty of exoplanets with large masses moving around their parent stars, very close compared to what we see in our solar system.

 

[rod]

This site has even more exoplanets orbiting 0.1 au or closer to their stars. 2365 I find using MS SQL. NASA Exoplanet Archive (caltech.edu)

 

[rod]

I examined the research paper cited in this article. Reference paper cited, Evidence for the Late Arrival of Hot Jupiters in Systems with High Host-star Obliquities, 29-April-2022, https://arxiv.org/pdf/2205.00040.pdf, 35-pages.

My observation. The paper has a table of hot jupiters studied on page 7. "Table 1. Isochrone Analysis Input Data". WASP-32 is an example listed first with stellar parallax 3.57 mas. Properties listed http://exoplanet.eu/catalog/wasp-32_b/

I calculate P = 2.7194E+00 day, listed P = 2.71865 day. In 1 Gyr period, this hot Jupiter could complete 1.3431E+11 or more than 134 billion revolutions around the host star near 1.1 Msun. The radius listed for WASP-32 b is 1.18 Rjup so mean density near 2.7 g cm^-3 with mass 3.6 Mjup. Applying the MMSN to 1.1 Msun star, a postulated disc could be 3.662554E+03 or 3662.554 earth masses for total dust and gas. No disc is observed presently at WASP-32 b. The exoplanet.eu site shows if disc detected. 5106 exoplanets listed and 89 have possible disc detected. The vast majority show no disc detected in these exoplanet systems.

 

[Unclear Engineer]

I am wondering if our own solar system ever had a "hot Jupiter". Would we know if our Sun swallowed such a planet something like 4 billion years ago? Or maybe just blew off/sucked off the gases and left a rock like Mercury?