Astronomy

Star Formation Simulated in the lab, Using Lasers, of Course

The vacuum of space isn’t really a vacuum. A vacuum is defined by Merriam-Webster as “a space absolutely devoid of matter.” However, even empty space has some matter in it. This matter, in the form of dust and gas, tends to collect into what are called molecular clouds. Without anything interfering with them they continue to float as a cloud.

When something happens to interrupt the balance of the molecular cloud, some of that dust and gas starts clumping together. As more and more of this dust and gas clump together gravity takes over and starts forming stars. One way that the balance of a molecular cloud can be interfered with is by a supernova remnant, the remains of an exploded star. Plasma jets, radiation, and other clouds can also interact with these clouds.

It is difficult to observe this process in action and there are too many variables to use computer modeling to determine how it all happens. Recently, an international team of researchers used something a little different to model the interaction between a supernova remnant and a molecular cloud, a laser and a foam ball.

The team used a high-power laser to create a blast wave that spread through a chamber of gas with a foam ball inside of it. Using X-ray imaging, they were able to observe the compression of the foam ball being hit by the blast wave.

X-ray radiographs of the foam ball: (a) without the influence of a blast wave, for reference; (b) at t = 500 ns after the beginning of the main laser pulse. Credit: Bruno Albertazzi et al.

These observations may help us understand the mechanisms for triggering star formation. Such interactions can impact star formation rate, the evolution of a galaxy, and explain the formation of some of the most massive stars.

This experiment was more of a proof-of-concept than anything, giving researchers a new way to use lasers to find answers about astronomical questions that are difficult to deduce by other means. And who doesn’t like the idea of using lasers… for anything?

The blast wave caused a deformation of the foam ball which ended up being compressed on part of it while some of it ended up being stretched out, changing the average density of the material. In their subsequent experiments the researchers will have to take this into account to get an accurate measurement of the compressed material and the shockwave’s impact on star formation. Soon the team will be testing how radiation, magnetic fields, and turbulence can affect star formation in molecular clouds.

More:

Header: Illustration of the evolution of a massive cloud which indicates the importance of SNR propagation in forming new stars. CREDIT: Albertazzi et al.

Shawn DiCenza

Recent Posts

More Views of the 2024 Eclipse, from the Moon and Earth Orbit

It's been just over a week since millions of people flocked to places across North…

5 hours ago

Baby Stars Discharge “Sneezes” of Gas and Dust

I’m really not sure what to call it but a ‘dusty sneeze’ is probably as…

10 hours ago

How Did Pluto Get Its Heart? Scientists Suggest an Answer

The most recognizable feature on Pluto is its "heart," a relatively bright valentine-shaped area known…

11 hours ago

The Milky Way’s Role in Ancient Egyptian Mythology

Look through the names and origins of the constellations and you will soon realise that…

11 hours ago

You Can't Know the True Size of an Exoplanet Without Knowing its Star's Magnetic Field

In 2011, astronomers with the Wide Angle Search for Planets (WASP) consortium detected a gas…

16 hours ago

Stellar Winds Coming From Other Stars Measured for the First Time

An international research team led by the University of Vienna has made a major breakthrough.…

2 days ago