Philippa Kaur

A long-suspected black hole may have finally come out of hiding.

A monstrously massive black hole in a distant galaxy probably has a smaller companion that orbits it every 12 years. But that tiny partner has never been detected. Now, astronomers claim to have seen a flash of light coming directly from the smaller black hole for the first time.

“We’ve never seen anything like this before,” said astronomer Mauri Valtonen on June 7 at a meeting of the American Astronomical Society in Albuquerque.

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Astronomers have been watching this object since the 1880s, when it showed up in a survey of asteroids as a brilliant point of light. That point of light, now dubbed OJ287, is a blazar. Among the brightest-looking objects in the universe, blazars are supermassive black holes that launch bright jets of radiation into space, and those jets happen to point almost directly at Earth. This one sits about 3.5 billion light-years away.

Sometimes, OJ287 shines even brighter than usual. For the past 40 years or so, astronomers have noticed that the object has a dramatic jump in brightness every 11 to 12 years.

In 1996, Valtonen and his colleague Harry Lehto, both of the University of Turku in Finland, suggested that the outbursts could be due to one supermassive black hole orbiting an even more massive black hole. Both black holes are probably behemoths, the astronomers calculated: The smaller is around 150 million times the mass of the sun, and the bigger is around 18 billion solar masses. For perspective, the black hole in the center of the Milky Way is about 4 million solar masses (SN: 5/12/22).

The bigger black hole is thought to be surrounded by a disk of white-hot gas and dust, which glows at many wavelengths of light. If the smaller black hole exists, then every time it plunges through that disk, it would trigger a flash of light — thus explaining the recurring outbursts.

[embedded content]
This animation shows a flash of light that a smaller supermassive black hole in the blazar OJ287 emits when it crashes through the disk of gas and dust swirling around the other more massive black hole it orbits.

But until now, no light had been detected from the second black hole itself. Its presence was merely inferred from those regular flares.

Valtonen and his colleagues predicted that the most recent flare should arrive in January or February 2022 and arranged to monitor OJ287 every day using telescopes on Earth and in space. The team saw flares like the ones they had seen before, but there was a new flare that was different. It was bright and quick, fading after one night.

The team proposed that this flare came from a jet created by the smaller black hole pulling material out of the disk as it approached, before the collision.

“It swallows a whole lot of disk matter,” Valtonen said. “That matter falls into the secondary black hole, and you get a huge flare.”

Previous observations missed that flare because it is so short. The team almost missed it in 2022, due to bad weather. “We never observed OJ287 night to night to night [before], this was the first time,” he said. “That’s why we saw it.”

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Some researchers have suggested other ways for a single black hole to give off the same pattern of light. If the team’s interpretation is correct, then it marks the first time the second black hole has been seen directly, Valtonen says.

“The detection of the second black hole should put an end to this discussion,” he says. “More generally, this could be the beginning of work on secondary jets in binary black hole systems, which could open up a new research field, now that we have at least one concrete example to study.” If other binary black holes make similar flashes as the smaller black hole crosses the larger one’s disk, astronomers now know how to look for them.

The observations do suggest the presence of a second black hole, says Caltech astronomer Seppo Laine, although other ideas are still possible.

“Mauri has been basically pushing this supermassive black hole binary model for decades now,” Laine says. “It doesn’t completely confirm it, but if this interpretation is correct, then it’s a significant step forward.”

Unfortunately, it may be difficult to test. The short flares come only once a decade, so astronomers need to be ready the next time. To resolve the two black holes directly, Valtonen says, might take a radio telescope in space. More

If you’re looking to visit a gas giant planet in another solar system — or if you’re simply a science fiction writer who needs such a world for your story — you’d better steer clear of little red stars.

A search for planets like Jupiter around low-mass red dwarf stars came up empty, researchers report in the July Astronomical Journal. “Around 200 stars, we did not detect a single one of these planets,” says Emily Pass, an astronomer at the Harvard-Smithsonian Center for Astrophysics in Cambridge, Mass.

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The find — or lack thereof — lends support to a theory of giant-planet building called core accretion. In this theory, gas giant planets like Jupiter and Saturn form by gradually piecing together a solid core out of debris orbiting a young star (SN: 4/14/22). That core eventually gets massive enough to attract lots of gas. But low-mass red dwarf stars shouldn’t host much solid material to begin with, so a paucity of gas giants is in line with that theory.

About three out of every four stars in the galaxy are red dwarfs, a type of star much fainter, cooler and smaller than the sun (SN: 8/23/21). They glow dimly because they were born with little mass, about eight to 60 percent that of the sun. Previous planet searches have found that few red dwarfs have gas giant planets. But the new search targeted red dwarfs with only 10 to 30 percent of the sun’s mass, which are the most common such stars.

Pass and colleagues spent about six years searching for the Doppler shift an orbiting planet would cause in starlight as the world pulled its sun toward and away from us. All the observed stars are nearby, within 50 light-years of Earth. The closest is the well-studied Barnard’s Star, just six light-years away, which was once thought to possess two Jupiter-sized planets (SN: 4/26/69).

But no gas giants turned up around that star or any of the others. Extrapolating to the rest of the galaxy, the researchers conclude that fewer than two out of every 100 low-mass red dwarfs have planets as massive as Jupiter.

“To actually form a Jupiter [around the lowest-mass stars] is very hard,” says Edward Bryant, an astronomer at University College London, who was not one of the researchers conducting the search. “Their lack of a detection of a Jupiter analog I think is very consistent with the expectations from core accretion.” Because the disks of gas and dust around infant low-mass red dwarfs are small, there’s less material to create gas giants the size of Jupiter.

But smaller, rocky worlds stand a much better chance.

In fact, many red dwarfs do have Earth-sized planets, some at the right distances from their suns to sport pleasant temperatures. “We are talking about strange new worlds, not an Earth 2.0,” Pass says.

In our solar system, she says, Jupiter’s gravity may have prevented lots of ice from reaching Earth. As a result, our world didn’t end up completely underwater. In a planetary system lacking such a massive gas giant, an Earth-sized planet could turn into a water world that might still give rise to a highly intelligent species, but one that would live underwater — think dolphins — and not do any astronomy at all.

“It’s not saying that you can’t have life on these planets,” Pass says. “But those planets are just going to be so different than our own experiences.” More

A spacecraft plunging into the sun’s atmosphere has revealed the likely source of powerful blasts of plasma in fast solar winds.

Far from the sun, the solar wind is a nebulous, turbulent plasma. But when NASA’s Parker Solar Probe dipped within about 8 million kilometers of the sun’s surface, it detected narrow plasma streams (SN: 12/15/21). The streams appear to be guided by magnetic fields tracing back to two relatively cool regions of the sun’s atmosphere known as coronal holes, researchers report June 7 in Nature.

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The solar wind — the steady stream of charged particles flowing from the sun — has two distinct speeds, dubbed as “slow” and “fast.” Until now, it wasn’t clear what was speeding the fast solar wind along. The plasma in most of the solar wind consists of protons, electrons and the nuclei of atoms blowing at hundreds of kilometers a second. But plasma from the area above the coronal holes can travel more than 10 times as fast.

The fast plasma streams were associated with events known as switchbacks, in which portions of the magnetic fields near the sun reverse direction (SN: 1/15/21). Switchbacks can result when magnetic field loops close to the sun’s surface connect to long field lines extending away from the sun. The reconnection leads to a sharp switchback kink that kicks the plasma on its way into space as the kink straightens out.

Higher energy streams, the researchers propose, are the result of newly reconnected field lines with sharply kinked switchbacks, while lower energy streams come from field lines with older kinks that had become more smoothed out.

Although the evidence that the fast solar wind is due to magnetic reconnections is compelling, it’s still circumstantial, says astrophysicist Stuart Bale of the University of California, Berkeley. “Our results suggest that the solar wind can be accelerated to high speeds very close to the sun,” Bale says. “This is somewhat different [than the] standard scenario of wind energization,” where the acceleration takes place farther from the sun.

Getting a handle on processes like the origin of the fast solar wind is important for practical reasons, Bale says. “We also believe that magnetic reconnection is responsible for solar flares and is involved in the release of coronal mass ejections, which have a major impact in space weather.” Solar flares and the space weather they create have led to electrical grid disruptions on Earth and interrupted radio communications, and they may threaten astronauts (SN: 7/30/2020).

The findings are also an important clue in the enduring mystery of why the sun’s atmosphere is millions of degrees Celsius hotter than its surface, says astrophysicist Gary Zank, who was not involved in the study (SN: 8/20/17). “But they do not identify the heating mechanism.”

The observations identify the importance of magnetic reconnection close to the sun, says Zank, of the University of Alabama in Huntsville. “The next step is to link that to the dissipation of the magnetic energy in determining the actual heating process.”

Another interesting aspect of the study is how the structure of the solar surface seems to be imprinted on the solar wind near the sun despite the presence of turbulence, says Amitava Bhattacharjee, a Princeton University astrophysicist who was not involved with the study. Other researchers have proposed that it can happen, he says, but in the new study, “the experimental and simulation evidence is more convincing.”

Parker’s ever closer encounters with the sun could confirm the source of the fast solar wind more definitively. And future passes will come as the sun heads into a phase with increasing numbers of sunspots and more solar wind, on the way to peak solar activity around July 2025.  “As we move into solar maximum,” Bale says, “we expect some serious surprises.” More

Cocoons of debris around dying stars could shake ripples in spacetime unlike any astronomers have ever seen.

“This is a potential source of gravitational waves that has never been investigated before,” astrophysicist Ore Gottlieb of Northwestern University in Evanston, Ill., said June 5 in a news conference at the American Astronomical Society meeting in Albuquerque.

The waves could potentially be picked up in the latest run of LIGO, which began on May 24.

Since LIGO’s first detection in 2015, all the gravitational waves seen thus far have been from the spiraling death dance of two compact objects — black holes, neutron stars or both (SN: 2/11/16). These events give off what are called coherent gravitational waves. “You can think of it as an orchestra playing harmonically,” Gottlieb said.

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A second type, incoherent waves, are expected to come from stellar explosions like supernovas (SN: 5/6/19). Because those bursts are spherically symmetrical and relatively slow, their waves are difficult for LIGO to detect. They’re more analogous to individual instruments playing different songs at the same time.

Gottlieb and colleagues considered another type of stellar death called a collapsar. When massive stars collapse into a black hole, they can emit jets of material traveling close to the speed of light. Computer simulations of how those jets form revealed a cocoon of material surrounding the jet, full of hot, turbulent gas and debris that expand in an asymmetric bubble around the dying star, says Gottlieb, who presented the research June 6.

As the bubble expands and pushes its way through the star, it could bump spacetime enough to produce incoherent gravitational waves, Gottlieb and colleagues concluded.

[embedded content]
As a massive star collapses, it emits jets of material (red) and a cocoon of other debris around the jets (yellow and green). This simulation shows how the turbulence in the jets and cocoon could shake spacetime, and translates the gravitational waves they might emit into sound.

LIGO and its fellow detectors — Virgo in Italy and KAGRA in Japan — currently have about a 1 percent chance of detecting cocoon gravitational waves. In future runs with improved detectors, that chance will go up.

Catching these waves could give astronomers a glimpse into the innermost parts of dying stars, which can’t be studied any other way, Gottlieb said. More