On this Student Spotlight: White Dwarf stars may create a potentially viable environment for life.
Cal Whyte, PhD student in the Department of Aerospace, Physics and Space Science at Florida Institute of Technology, looks into this.
Caldon T. Whyte is a PhD student in the Department of Aerospace, Physics and Space Science at Florida Institute of Technology (Florida Tech) with a research focus on space exploration and serves as an Ortega Observatory Assistant. After graduating from Florida Tech with a bachelor’s degree in astrobiology in 2023, Whyte has pursued his interest in studying white dwarf stars—the cooling remnants of low-mass stars that have exhausted their nuclear fuel source—and the likelihood of life surviving in their orbits. Whyte’s findings can help scientists make real-world decisions about future space exploration. When embarking on a search for star systems that could sustain photosynthesis, for example, astronomers can now know that white dwarfs create a potentially viable environment for some planets, thanks to Whyte’s research.
Exoplanets
Exoplanets are planets outside of our solar system that orbit another star in our galaxy. Recent advances in instrumentation provided by the James Webb Space Telescope have made the search for habitable planets become very promising—and the ability to probe into the atmospheres of exoplanets possible.
Since our own Sun is the only known star to host a habitable planet, other Sun-like stars have long been perceived as ideal hosts for habitable exoplanets. But my research looks at the possible habitability of planets orbiting White Dwarf stars. White Dwarfs are like the old dead remnants of stars, and have not been considered good places to look for life. But we have observed that exoplanets do exist around these stars—and we started to look at whether any of these exoplanets could be like Earth.
There’s growing momentum to figure out whether these planets could exist within what we call the habitable zone, or the Goldilocks zone, where life could exist. And what’s so exciting about White Dwarfs is their long-term stability.
It’s believed that our Sun will only be habitable for a total of six or seven billion years. Since White Dwarf stars don’t have that same brief window, it is possible that the planets around them with an atmosphere that could support life may exist in the habitability zone for a much longer period of time.
Exploring processes that contribute to habitability, such as the atmospheric circulation and chemistry that occur on these planets, would help us in understanding whether they can host life. So, I analyzed whether two key processes–photosynthesis and ultraviolet-driven abiogenesis–would receive enough energy in a White Dwarf’s habitable zone to occur. We found that white dwarfs can fuel both processes simultaneously.
The discovery of this potential Earth-like similarity could change the trajectory of the search for life in the universe.
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Ortega Observatory
[FloridaTechNews] – Ph.D. Student Makes Case for Exploring Likelihood of Life Around White Dwarf Stars
