SAEDNEWS: According to a pair of studies published Monday in Nature Astronomy, space dwarfs may be better described as “hungry” rather than simply Bashful, Sleepy, Grumpy, or Dopey, as they are in fairy tales.
Accoridng to Saednews, These are dwarf stars, of course. Some dwarf stars are small, faint stars that can be orbited by other dwarf stars or planets. Our own Sun is a yellow dwarf star, while other types include orange and red dwarfs. White, brown and, if proven to exist, blue dwarfs are the remnants of dead stars or failed stars. Understanding these stars and their remains is essential to unlocking the history of galaxies—and planets.
In new research, scientists describe two dwarf stars—one red dwarf and one white dwarf—that appear to be acting out a dramatic cosmic process: consuming the objects orbiting them.
The observations “seek to understand the effect stars have on the planets that they host,” says Jamie Williams, lead author of one of the studies and a Ph.D. student at the University of Warwick in England.
“The key takeaway is that planets don’t exist in isolation, but their evolution is directly tied to the star they orbit,” he says. “In order to understand the life of planets, we must understand star-planet interactions.”
Williams and his colleagues observed a white dwarf displaying unusual chemical signatures, including zinc, copper and niobium. At the same time, the star’s brightness appeared to dim periodically, suggesting that a planet was orbiting it.
Together, the findings suggest that the planet formed after the star had already died and that its atmosphere is now being consumed by the white dwarf.
The discovery suggests that “planetary systems can experience a rebirth,” a phenomenon astronomers have never observed in our solar system, Williams says.
The second study reveals another never-before-seen interaction: a red dwarf slowly and steadily consuming its orbiting companion, a brown dwarf.
Usually, a star and its companion either remain relatively independent or the star completely and rapidly devours its neighbor. But in this system, material appears to be flowing from the brown dwarf toward the red dwarf in a process that could continue for millions of years.
The discovery was “a happy accident,” says Aaron Householder, lead author of the study and a graduate student at the Massachusetts Institute of Technology. Now that the team has observed this phenomenon, Householder says he is curious about what else might be out there.
“We’re excited to see if we can find a star eating a planet or maybe even two planets eating each other—different types of combinations of these objects,” he says.
Both studies could have implications for our own planet.
A second-generation planet could theoretically form after our Sun dies, Williams says. Meanwhile, Householder’s research suggests that instead of making a quick and fiery meal of Earth, the Sun might one day slowly nibble away at our atmosphere.
