Tech & Science Vampire white dwarf star feeding on neighbour spotted in Kepler data
First fines issued under tougher Fraser Island dingo-feeding laws
One person was given an on-the-spot fine of $2135 after footage was provided to park rangers of them allegedly luring and feeding a dingo in a residential area.The first fine was issued after an observer gave park rangers footage showing a person luring and feeding a dingo in the Orchid Beach residential area of the island, which is also known as K'Gari.
A newly discovered "vampire system" offers a glimpse of what could befall our solar system in a few billion years, say astronomers.
They uncovered the cosmic feeding frenzy while trawling through data from the now-defunct Kepler Space Telescope.
The astronomers found a white dwarf star — the dense remains of an exploded star — feasting on an object known as a brown dwarf in a system 3,000 light years away in the constellation of Scorpius.
They say the discovery, published in the journal, provides new insights into periodic outbursts known as dwarf novas.
Fines for feeding dingoes on Qld island
Fines have been issued against two individuals caught feeding dingoes in separate incidences on an island off Queensland. Two people have been slapped with hefty fines for feeding dingoes on K'Gari (Fraser Island) off the Queensland coast.Fines of $2135 were issued to a person filmed feeding a dingo in the island's Orchid Beach residential area on December 28, and to another at Waddy Point beach on January 16.The state government has cracked down on anyone caught approaching or giving food to the canines following a spate of attacks in the past year.
Capturing such an event is tricky, said study co-author Brad Tucker of the Australian National University.
"These outbursts happen so quickly," Dr Tucker said.
"That's why this unique ability to harness Kepler has allowed us to see it and spy on it in a way that hasn't really been done before."
What's a dwarf nova?
Dwarf novas are created when the gravity of a white dwarf star sucks the hydrogen off a brown dwarf.
"A brown dwarf is kind of like a big Jupiter," Dr Tucker explained.
"We joke that it's a failed star, but it's really something that's bigger than Jupiter but not quite as big as another star."
Hydrogen sucked off the companion builds up around the white dwarf until it reaches a critical level.
The same process happens in some types of supernovas, but instead of a brown dwarf the neighbour is much bigger.
Hero father who made headlines for rescuing his neighbour from a burning home avoids jail after stealing a Good Samaritan's phone and emptying their bank account
Darren Kyle Hunter, 31, was involved in an incident in April 2017 and was helped by a man who offered his iPhone so Hunter could call a taxi, the a Western Australian court heard on Friday.Darren Kyle Hunter, 31, was involved in an incident at Spearwood Tavern in April 2017 and was helped by a man who offered his iPhone so Hunter could call a taxi, the Western Australia District Court heard on Friday.
"If that brown dwarf was bigger and was just another star [the white dwarf] would eventually explode as a type 1a supernova," Dr Tucker said.
Instead, he said, only the disc of material surrounding the white dwarf explodes in flashes, a bit like a car spluttering.
Ultimately, the white dwarf will suck the life out of its brown dwarf neighbour if it is close enough.
"It's in some ways a better analogy of a vampire than [a supernova].
"A supernova will steal some hydrogen and explode, where these will take it all."
We don't know what will happen to the brown dwarf in this system, but the outlook is grim.
The two objects are very close — a distance equivalent from our Sun to Mars — and orbit each other every 82 minutes.
A similar scenario could play out in our own solar system billions of years in the future.
"Our Sun will turn into a white dwarf," Dr Tucker said.
"Our white dwarf will eventually, if it is close enough, feed off Jupiter."
'It would have killed me': Elderly man attacked by neighbour in his home over horn spat
Orelia resident Peppe, 88, said he is "very lucky" to be alive after a neighbour allegedly forced his way into his Menli Place home on Friday morning.Orelia resident Peppe, 88, said he is "very lucky" to be alive after a neighbour allegedly forced his way into his Menli Place home and confronted him in his backyard on Friday morning.
How to hunt down a vampire
About 100 dwarf nova have been found so far in a sky full of billions of stars.
"We think white dwarf stars are common, but they are really hard to find because they are small," Dr Tucker said.
"Its hard to get a picture of them without seeing them do something like this."
Using specially designed software developed by Ryan Ridden-Harper, now at the Space Telescope Science Institute, the team were able to track the 30-day feeding frenzy from beginning to end.
"With the precise data from the Kepler Space Telescope we could study the first hours of the super-outburst," Dr Ridden-Harper.
"Surprisingly, we found the system begins to brighten very slowly for the first 10 hours, before rapidly brightening by 1,600 times."
At the peak of the outburst temperatures reached up to 11,700 degrees Celsius — a phenomenon that hadn't been previously predicted by models.
The astronomers will now use the software to comb through more data from, the Transiting Exoplanet Survey Satellite for similar events.
NASA’s Kepler spots a star slurping up a planet
NASA's Kepler space telescope is extremely good at spotting the subtle hints of distant exoplanets. It does this by detecting slight drops in the brightness of stars, signaling the presence of one or more planets hanging out in orbit. Kepler has spotted many new worlds during its mission, but one of its latest might be its most interesting discovery yet. As researchers describe in a new paper in Monthly Notices of the Royal Astronomical Society, Kepler detected what is being described as a “super-outburst” centered in a distant system.
"We know about the big things like supernova decently well," Dr Tucker said.
"But we do not have a good handle on [smaller fainter things at the ends of their lives] because we've never been able to look at these things on such short time scales."
The power of space surveys
Astronomer Jonti Horner of the University of Southern Queensland said the discovery is a testament to the power of large survey telescopes such as Kepler and TESS.
"This gives you a whole new window on the Universe where you can dig through all these databases and find things that are just waiting to be discovered," said Dr Horner, whose own team recently found t.
He said the latest discovery highlighted the diversity of stars.
"Binary systems are interesting, they are peculiar, and they are not what you could imagine."
Around 40 to 50 per cent of what you see in the night sky are multiple-star systems.
"[Dwarf nova] are not hugely rare, but they are not all that common either because you need a binary star system that is close enough.
"This is just another of those discoveries that reminds us that everything in the night sky is more complicated."
We’ve Observed A Spinning Star That Drags The Very Fabric Of Space And Time .
One of the predictions of Einstein’s general theory of relativity is that any spinning body drags the very fabric of space-time in its vicinity around with it. This is known as “frame-dragging”. In everyday life, frame-dragging is both undetectable and inconsequential, as the effect is so ridiculously tiny. Detecting the frame-dragging caused by the entire Earth’s spin requires satellites such as the US$750 million Gravity Probe B, and the detection of angular changes in gyroscopes equivalent to just one degree every 100,000 years or so.