ALMA, VLA Trace Betelgeuse's 2,200-K Layer as Siwarha Disturbs Its Atmosphere
Updated
Updated · almaobservatory.org · Oct 28
ALMA, VLA Trace Betelgeuse's 2,200-K Layer as Siwarha Disturbs Its Atmosphere
3 articles · Updated · almaobservatory.org · Oct 28
Summary
Seven-frequency radio observations from 2021 to 2026 found fresh evidence that Siwarha is perturbing Betelgeuse’s extended atmosphere while mapping temperature changes after the 2019-2020 Great Dimming.
Betelgeuse’s outline appeared more elongated when the companion was expected farther from the star in view, and rounder when it likely passed in front of or behind it, matching a close orbit through the atmosphere.
ALMA measured a brightness temperature of about 2,200 kelvin near the visible surface, confirming a cool layer between the photosphere and the chromosphere; farther out, around 2.7 stellar radii, temperatures reached about 3,500 kelvin.
At VLA frequencies, atmospheric temperatures have risen from the unusually low 2019 readings, adding to earlier evidence that Betelgeuse’s outer atmosphere has largely rebounded while a roughly 5.9-year companion orbit may drive longer-term variability.
What if Betelgeuse's egg-like shape is actually caused by massive internal eruptions rather than the gravitational pull of an unseen companion star?
Could Betelgeuse's newly discovered hidden companion, Siwarha, be the secret trigger accelerating the giant star's highly anticipated supernova explosion?
How does a young yellow star manage to survive while orbiting deep within the scorching, chaotic atmosphere of a dying red supergiant?