Arcs, rings and spirals appear in the debris disk
around the star HD 141569A. The black region in the center is caused by a
mask that blocks direct light from the star. This image incorporates
observations made in June and August 2015 using the Hubble Space
Telescope's STIS instrument. Credits: NASA/Hubble/Konishi et al. 2016 . Unlabeled version
When exoplanet scientists first spotted patterns in disks of dust and
gas around young stars, they thought newly formed planets might be the
cause. But a recent NASA study cautions that there may be another
explanation — one that doesn’t involve planets at all.
Exoplanet hunters watch stars for a few telltale signs that there might be planets in orbit, like changes in the color and brightness of the starlight. For young stars, which are often surrounded by disks of dust and gas, scientists look for patterns in the debris — such as rings, arcs and spirals — that might be caused by an orbiting world.
“We’re exploring what we think is the leading alternative contender to the planet hypothesis, which is that the dust and gas in the disk form the patterns when they get hit by ultraviolet light,” said Marc Kuchner, an astrophysicist at NASA's Goddard Space Flight Center in Greenbelt, Maryland.
Kuchner presented the findings of the new study on Thursday, Jan. 11, at the American Astronomical Society meeting in Washington. A paper describing the results has been submitted to The Astrophysical Journal.
Exoplanet hunters watch stars for a few telltale signs that there might be planets in orbit, like changes in the color and brightness of the starlight. For young stars, which are often surrounded by disks of dust and gas, scientists look for patterns in the debris — such as rings, arcs and spirals — that might be caused by an orbiting world.
“We’re exploring what we think is the leading alternative contender to the planet hypothesis, which is that the dust and gas in the disk form the patterns when they get hit by ultraviolet light,” said Marc Kuchner, an astrophysicist at NASA's Goddard Space Flight Center in Greenbelt, Maryland.
Kuchner presented the findings of the new study on Thursday, Jan. 11, at the American Astronomical Society meeting in Washington. A paper describing the results has been submitted to The Astrophysical Journal.
When high-energy UV starlight hits dust grains, it strips away
electrons. Those electrons collide with and heat nearby gas. As the gas
warms, its pressure increases and it traps more dust, which in turn
heats more gas. The resulting cycle, called the photoelectric
instability (PeI), can work in tandem with other forces to create some
of the features astronomers have previously associated with planets in
debris disks.
Kuchner and his colleagues designed computer simulations to better
understand these effects. The research was led by Alexander Richert, a
doctoral student at Penn State in University Park, Pennsylvania, and
includes Wladimir Lyra, a professor of astronomy at California State
University, Northridge and research associate at NASA’s Jet Propulstion
Laboratory in Pasadena, California. The simulations were run on the Discover supercomputing cluster at the NASA Center for Climate Simulation at Goddard.
In 2013, Lyra and Kuchner suggested that PeI could explain the narrow rings seen in some disks. Their model also predicted that some disks would have arcs, or incomplete rings, which were first directly observed in 2016.
“People very often model these systems with planets, but if you want
to know what a disk with a planet looks like, you first have to know
what a disk looks like without a planet,” Richert said.
Richert is lead author on the new study, which builds on Lyra and
Kuchner’s previous simulations by including an additional new factor:
radiation pressure, a force caused by starlight striking dust grains.
Light exerts a minute physical force on everything it encounters.
This radiation pressure propels solar sails and helps direct comet tails
so they always point away from the Sun. The same force can push dust
into highly eccentric orbits, and even blow some of the smaller grains
out of the disk entirely.
The researchers modeled how radiation pressure and PeI work together
to affect the movement of dust and gas. They also found that the two
forces manifest different patterns depending on the physical properties
of the dust and gas.
The 2013 simulations of PeI revealed how dust and gas interact to
create rings and arcs, like those observed around the real star HD
141569A. With the inclusion of radiation pressure, the 2017 models show
how these two factors can create spirals like those also observed around
the same star. While planets can also cause these patterns, the new
models show scientists should avoid jumping to conclusions.
“Carl Sagan used to say extraordinary claims require extraordinary
evidence,” Lyra said. “I feel we are sometimes too quick to jump to the
idea that the structures we see are caused by planets. That is what I
consider an extraordinary claim. We need to rule out everything else
before we claim that.”
Kuchner and his colleagues said they would continue to factor other
parameters into their simulations, like turbulence and different types
of dust and gas. They also intend to model how these factors might
contribute to pattern formation around different types of stars.
A NASA-funded citizen science project spearheaded by Kuchner, called Disk Detective,
aims to discover more stars with debris disks. So far, participants
have contributed more than 2.5 million classifications of potential
disks. The data has already helped break new ground in this research.
By Jeanette Kazmierczak
NASA's Goddard Space Flight Center, Greenbelt, Md.
Editor: Rob Garner
Source: NASA/Solar System and Beyond
