Viw Magazine

Men's Weekly

.

  • Written by Valentin Christiaens, Research Fellow in Astrophysics, Monash University
The bright spot in the centre of the image is a new planet forming. Valentin Christiaens et al./ ESO, Author provided

When Italian astronomer Galileo Galilei first spotted four moons of Jupiter through a telescope, he realised that not everything goes around the Earth, as was the prevailing theory in 1610.

The presumed origin of the Galilean moons was in a swirling circumplanetary disc of gas and dust around the newborn Jupiter.

Jupiter and the four Galilean moons, a composite of several images as seen through a telescope. Flickr/Thomas Bresson, CC BY

But direct evidence of circumplanetary discs made of gas and dust eluded astronomers, despite an intensive search. Until now.


À lire aussi : How we found a white dwarf – a stellar corpse – by accident


We detected the first evidence for one of these discs in the form of an infrared glow around a baby planet called PDS 70 b, the details published in two papers this week.

It was not easy to find

The discovery required one of the largest telescopes on Earth (the creatively named Very Large Telescope in Chile), a sophisticated spectrograph (SINFONI) to acquire images at different wavelengths in the infrared, and new image-processing algorithms developed specifically for the dataset we gathered.

The newborn planet orbits a star called PDS 70, which is young and relatively close to us (a trifling 369 light years away) in what is known as the Upper Centaurus-Lupus star-forming region of the Milky Way.

The star is just a baby itself, less than 10 million years old. In stellar terms PDS 70 is barely out of nappies (our Sun is 4.6 billion years old).

Apart from its youth and proximity, the main reason we chose to study PDS 70 is that previous observations showed a large hole or gap in the disc of gas and dust surrounding the star.

This hole, covering an area almost the size of our Solar System, hints at the presence of planets orbiting the star, which are responsible for carving away the disc material.

Infrared image of the newborn planet PDS 70 b (the bright spot, bottom left) and its circumplanetary disc. The actual star is in the centre of the image (marked by *) but its glare blocked out by the processing. The second brightest spot (above right) is thought to be another planet forming and is being studied by other researchers. Valentin Christiaens et al./ESO, Author provided

The new images we gathered show that the gap is not entirely empty.

They reveal arcs and spirals of dusty material, and a bright blob, which had first been detected and interpreted as a baby planet in two studies published last year.

And it’s a whopper planet - about 10 times heavier than Jupiter.

In the infrared

What is new in our analysis is that we probed infrared light from the planet at longer wavelength than previous studies. We were able to show for the first time that the planet’s infrared colours cannot be explained by its atmosphere alone.

Instead, the measured infrared excess suggests the presence of a circumplanetary disc, just like the one imagined as the birthplace of Jupiter’s four Galilean moons – Io, Europa, Ganymede and Callisto.

Decades ago, the same argument was used as evidence for the presence of protoplanetary discs, the dusty discs of gas around baby stars that are the birthplaces of planets themselves.

An illustration of a protoplanetary disk: the rings around young star suggest planet formation in progress. Shutterstock/Jurik Peter

Now we can use the same techniques but on a smaller scale to see the birthplace of moons.

The tricky part is that spotting planets with a telescope is like staring into car headlights and trying to spot a firefly. We first had to model and subtract the bright glare of the star, to spot the feeble glow of the planet.

In our processed image (above) we carefully deleted the starlight (we show the location with an asterisk), revealing both the planet and faint structures in the disc surrounding the star.

Possible moons

The discovery of the four largest moons of Jupiter four centuries ago gave astronomers a first hint that giant planets must form surrounded by a circumplanetary disc.

Plenty of work has been done since to try to understand their properties, but we finally have direct confirmation that they exist. It’s the culmination of a long search.


À lire aussi : Observing the invisible: the long journey to the first image of a black hole


It’s also exciting. Our work shows that theoretical models of giant planet formation were not too far off. There is now the possibility that moons could be forming right now in the circumplanetary disc around PDS 70 b.

It’s hoped the new algorithm we developed can now be used to attempt to extract faint signals from other complex datasets of planets forming in other star systems.

It blows the mind to think we might see other planets and even moons in the process of formation, using the biggest telescope in the world. It’s just another reminder of how small and insignificant we really are.

Valentin Christiaens receives funding from the Australian Research Council via DP180104235.

Daniel Price receives funding from the Australian Research Council via DP180104235 and FT130100034

Authors: Valentin Christiaens, Research Fellow in Astrophysics, Monash University

Read more http://theconversation.com/a-disc-of-dust-and-gas-found-around-a-newborn-planet-could-be-the-birthplace-of-moons-118260

Designing the Ideal Healthcare Environment with a Professional Medical Centre Fitout

When it comes to healthcare spaces, functionality, hygiene, and patient comfort take top priority. An intelligently designed medical centr...

Stay Comfortable Year-Round with Ducted Cooling Melbourne

When the temperature starts to rise, having a reliable and efficient cooling system becomes a priority. With unpredictable weather and sud...

Best Practices for Content Ownership and Tagging Across Departments

Image by kaboompics on Freepik The bigger and more complex content ecosystems grow, the more valuable ownership and tagging become. In ent...

Understanding Public Liability Insurance Australia: What You Need to Know

Image by rawpixel.com on Freepik The necessity of public liability insurance in Australia is that it acts as a financial safeguard for busi...

How HID Proximity Cards Improve Workplace Security Without Slowing Down Access

In today’s workplaces, security is non-negotiable, but so is speed. Companies are under pressure to protect their people, property, and ...

Unlock Business Insights Faster with Power BI Tools

In this digital age where data drives the consumer landscape, businesses are shipping huge amounts of data every day. To remain competit...

Why Split System Installation Is a Smart Choice for Home Climate Control

Temperature control is essential for comfort, and when it comes to efficient, versatile cooling and heating, a split system is one of the ...

The Ultimate Guide to Door Replacement: Everything You Need to Know

Image by freepik Sure, swapping out a door is a fairly easy task, but it requires careful consideration of options for materials, designs...

Common Web Development Issues Perth Businesses Face (and How Agencies Fix Them)

Image by freepik Let's be honest, in the bustling heart of Perth's business scene, a website that's not up to scratch is like trying to he...

Life With Clear Aligners: 10 Small Changes That Make a Big Difference

Image by tonodiaz on Freepik Clear aligners have transformed orthodontics, offering a nearly invisible way to straighten teeth without the...

Choosing the Right Hair Loss Treatment for Your Needs

Millions of people experience hair loss globally, and it can be a major cause of emotional discomfort and self-consciousness. Hair loss ca...

Cardboard Display Boxes: An Effective Solution for Retail Presentation

In the competitive world of retail, how products are presented can be just as important as the products themselves. Cardboard display boxe...

Why Hiring a Skilled Shopify Web Developer Can Transform Your Online Store

Shopify has become one of the most popular e-commerce platforms due to its ease of use, powerful features, and scalability. However, creat...

Selling a Home Left 1 in 3 Aussies in Tears, Survey Finds

New research on selling property found that more than 1 in 3 people who sold a property in the past two years admitted to crying at some poi...

Brisbane Motor Vehicle Accident Lawyers & Motorbike Accident Claims

Motorbike accidents in Brisbane can lead to severe injuries and complex legal challenges, given the vulnerability of riders on the road. F...

Jesse Martin, OAM Sets Sail Again with Portland Roads - Sailing the Whitsundays

Jesse Martin OAM shot to fame in 1999 as the world’s youngest sailor to circumnavigate the globe – solo, unassisted and non-stop. No...

Why Modern Roller Shutters Are the Perfect Solution for Your Home or Business

Whether you're looking to secure your home or make your business more energy-efficient, modern roller shutters are a smart choice. In this...

Everything You Need to Know About the EWPA Yellow Card

The EWPA Yellow Card is an important certification in the construction and workplace safety sectors. It plays a key role in ensuring worke...

From Residential to NDIS to Commercial: How Mr Window Cleaning Covers Every Window

Not all window cleaning jobs are created equal. A quiet suburban home, a bustling retail store, and a property under an NDIS plan each com...

How Timely Duct Inspections and Repairs Improve HVAC Efficiency

You have cranked up the air conditioning, but your home still feels unevenly cooled or stuffy. Sound familiar? Many homeowners jump straig...