I'm interested in the idea that Sirius B is actually an exoplanet. Sirius A has a variation in proper motion of 6.2 arc second over 50 years. A heavy gas giant would cause it to orbit around a barycenter, similar to Jupiters effect on our sun, and that orbital period would be similar to the orbital period of the gas giant.

The Hubble Space Telescope took pictures of Sirius B, or, the gas giant that has been believed to be a "super dense star", close to apastron in August 2016, when the separation was 10.7 arcsecs, here is the raw image, the right one with the brightness turned up.

The light spectrum from "Sirius B" is equivalent to that from Sirius ("A"), what would be expected from an exoplanet reflecting the light of its star.

Based on the distance between the exoplanet (gas giant) and Sirius, 11 arc seconds at most, it looks like Sirius has a very large corona.

12 solar radii, could be within the boundaries necessary to support a gas giant around Sirius in that video, extending outwards 6 diameters in either direction, making the star appear 13x its size.

With a corona same as our sun, the stellar body looks like this,

20x Sirius diameter, if the diameter is 1/13th of the corona

Synapses

NASA's STEREO Maps Much Larger Solar Atmosphere Than Previously Observed - nasa.gov