Large Binocular Telescope image shows the supernova in M51
An otherwise nondescript binary star system in the Whirlpool Galaxy has brought astronomers tantalizingly close to their goal of observing a star just before it goes supernova.
In the first survey of its kind, the researchers have been scanning 25 nearby galaxies for stars that brighten and dim in unusual ways, in order to catch a few that are about to meet their end. In the three years since the study began, this particular unnamed binary system in the Whirlpool Galaxy was the first among the stars they’ve cataloged to produce a supernova.
The astronomers were trying to find out if there are patterns of brightening or dimming that herald the end of a star’s life. Instead, they saw one star in this binary system dim noticeably before the other one exploded in a supernova during the summer of 2011. [ … ]
The system is believed to have contained one very bright blue star and one even brighter red star. From what the astronomers can tell, it’s likely that the red star is the one that dimmed over the three years, before the blue star initiated the supernova.
Credit: Ohio State University