In December 2024, astronomers in Chile successfully captured clear images of a companion star orbiting the well-known red supergiant Betelgeuse. This significant achievement was made possible using the SPHERE instrument on the Very Large Telescope. The discovery marks the most definitive detection of Betelgeuse's companion star, which has been speculated about for over a century. The companion star, named Siwarha, is believed to be 2.6 to 3.1 times the mass of the sun, which is more massive than previously anticipated. The findings were reported in a paper set to appear in Astronomy & Astrophysics, highlighting the importance of this discovery in understanding the dynamics of star systems. The research team, led by astronomer Andrea Dupree from the Harvard-Smithsonian Center for Astrophysics, linked a six-year brightness cycle of Betelgeuse to the presence of this smaller star. This cycle had puzzled astronomers for years, as it was longer than the pulsation variations typically observed in Betelgeuse itself. The companion star is expected to reach its farthest point from Betelgeuse as seen from Earth in December 2024, providing a unique opportunity for further observations. The excitement surrounding this discovery reflects the ongoing interest in Betelgeuse, which is one of the most recognizable stars in the night sky, marking one shoulder of the constellation Orion.
