(Originally published by Stanford University)
February 23, 2012
For every typical star in our galaxy, there may be up to 100,000 “nomad planets” not tied to any solar system, according to a new study by researchers at the Kavli Institute for Particle Physics and Cosmology (KIPAC), a joint institute of Stanford University and the SLAC National Accelerator Laboratory.
An artistic rendition of a nomad object wandering the interstellar medium. The object is intentionally blurry to represent uncertainty about whether or not it has an atmosphere. A nomadic object may be an icy body akin to an object found in the outer Solar System, a more rocky material akin to asteroid, or even a gas giant similar in composition to the most massive Solar System planets and exoplanets. Image by Greg Stewart/SLAC
If observations confirm the estimate, this new class of celestial objects will impact current theories of planet formation and could change our understanding of the origin and abundance of life.
“If any of these nomad planets are big enough to have a thick atmosphere, they could have trapped enough heat for bacterial life to exist,” said Louis Strigari, leader of the team that reported the result in a paper submitted to the Monthly Notices of the Royal Astronomical Society. Although nomad planets don’t bask in the warmth of a star, they may generate heat through internal radioactive decay and tectonic activity.
Searches over the past two decades have identified more than 500 planets outside our solar system, almost all of which orbit stars. Last year, researchers detected about a dozen nomad planets using a technique called gravitational microlensing, which looks for stars whose light is momentarily refocused by the gravity of passing planets.
Their research produced evidence that roughly two nomads exist for every typical, so-called main-sequence star in our galaxy. The new study estimates that nomads may be up to 50,000 times more common than that.
To arrive at what Strigari himself called "an astronomical number," the KIPAC team took into account the known gravitational pull of the Milky Way galaxy, the amount of matter available to make such objects and how that matter might divvy itself up into objects ranging from the size of Pluto to larger than Jupiter. Not an easy task, considering no one is quite sure how these bodies form. According to Strigari, some were probably ejected from solar systems, but research indicates that not all of them could have formed in that fashion.
"To paraphrase Dorothy from The Wizard of Oz, if correct, this extrapolation implies that we are not in Kansas anymore, and in fact we never were in Kansas," said Alan Boss of the Carnegie Institute for Science and author of The Crowded Universe: The Search for Living Planets, who was not involved in the research. "The universe is riddled with unseen planetary-mass objects that we are just now able to detect."
A good count, especially of the smaller objects, will have to wait for the next generation of big survey telescopes, especially the space-based Wide-field Infrared Survey Telescope and the ground-based Large Synoptic Survey Telescope, both set to begin operation in the early 2020s.
A confirmation of the estimate could lend credence to another possibility mentioned in the paper – that as nomad planets roam their starry pastures, collisions could scatter their microbial flocks to seed life elsewhere.
"Few areas of science have excited as much popular and professional interest in recent times as the prevalence of life in the universe," said co-author and KIPAC Director Roger Blandford. “What is wonderful is that we can now start to address this question quantitatively by seeking more of these erstwhile planets and asteroids wandering through interstellar space, and then speculate about hitchhiking bugs."
Additional authors included KIPAC member Matteo Barnabè and affiliate member Philip Marshall of Oxford University. The research was supported by NASA, the National Science Foundation and the Royal Astronomical Society. For more information, visit http://kipac.stanford.edu.
Original press release.