Exoplanets dance around distant star in stunning 12-year timelapse (video)

[Admin]

A new video shows us 12 years in the lives of orbiting exoplanets, crunched down to just a few dramatic seconds.

Exoplanets dance around distant star in stunning 12-year timelapse (video) : Read more

 

[rod]

HR8799 is a well-studied and documented system over the years. Here are some past examples.

Exoplanet Atmospheres Reveal 'Peculiar' Fingerprints, http://www.livescience.com/28851-exoplanet-atmospheres-reveal-peculiar-fingerprints.html

GRAVITY instrument breaks new ground in exoplanet imaging, https://phys.org/news/2019-03-gravity-instrument-ground-exoplanet-imaging.html

 

[rod]

The Extrasolar Planets Encyclopaedia (exoplanet.eu), this site shows masses ranging for HR 8799 exoplanets, 7 Jupiter to 9.6 Jupiter with semi-major axes ranging 16.4 to 68 au from the star.

NASA Exoplanet Archive (caltech.edu), this site is similar. Mass range 7 to 10 Jupiter masses, sem-major axes 14.5 to 70 au. Host star mass 1.5 to 1.61 solar masses.

 

[Helio]

GRAVITY instrument breaks new ground in exoplanet imaging, https://phys.org/news/2019-03-gravity-instrument-ground-exoplanet-imaging.html

Interesting.

They, apparently, were able to get 10x better resolution of the system's spectrum. Then they tickled-out the planet's contribution to isolate its spectrum, I assume. I believe this would require it to be a transiting planet.

 

[rod]

I went back and reviewed the exoplanet.eu site and NASA archive site for stars with multiple planets.

exoplanet.eu site shows 853, the NASA archive site shows 880, both include HR 8799 system (4 planets). Both sites show stars with 4 or more, up to 8 (107 systems). This includes TRAPPIST-1 system. Comparing these multi-planet systems is very interesting when looking at our solar system. HR 8799 is a good example. Another interesting example, Kepler-11 system with 6.