According to a newly-published study, a rare triple-star system containing a planet in a stable orbit was recently discovered by researchers at the Harvard-Smithsonian Center for Astrophysics.
Published in the Astronomical Journal, the study detailed the discovery of distant world, known as KELT-4Ab.
While the planet orbits one star in the system, that star is circled by a pair of stars. Standing on the surface of the KELT-4Ab, the two orbiting stars would appear as bright as the full moon does in our sky.In addition to describing an exotic solar system, the study also provides new details on the evolution of a “hot Jupiter,” or a gas giant that orbits close to its host star.
KELT-4Ab, which is approximately the same size as Jupiter, orbits KELT-A once every three days. The nearby stars KELT-B and KELT-C orbit each other once every three decades, and jointly they travel around KELT-A and its planet about every 4,000 years.
Scientists combined telescopes on Earth and in space to learn that this famous quasar has a core temperature hotter than 10 trillion degrees! That’s much hotter than formerly thought possible.
By combining signals recorded from radio antennas on Earth and in space – effectively creating a telescope of almost 8-Earth-diameters in size – scientists have, for the first time, gotten a look at fine structure in the radio-emitting regions of quasar 3C273, which was the first quasar known and is still one of the brightest quasars known. The result has been startling, violating a theoretical upper temperature limit. Yuri Kovalev of the Lebedev Physical Institute in Moscow, Russia, commented:
We measure the effective temperature of the quasar core to be hotter than 10 trillion degrees!
This result is very challenging to explain with our current understanding of how relativistic jets of quasars radiate.
The astronomers’ achievement produced a pair of scientific surprises that promise to advance the understanding of quasars, supermassive black holes at the cores of galaxies.
Astronomers using an orbiting radio telescope in conjunction with four ground-based radio telescopes have achieved the highest resolution, or ability to discern fine detail, of any astronomical observation ever made. Their achievement produced a pair of scientific surprises that promise to advance the understanding of quasars, supermassive black holes at the cores of galaxies.
The scientists combined the Russian RadioAstron satellite with the ground-based telescopes to produce a virtual radio telescope more than 100,000 miles across. They pointed this system at a quasar called 3C 273, more than 2 billion light-years from Earth. Quasars like 3C 273 propel huge jets of material outward at speeds nearly that of light. These powerful jets emit radio waves.
I was sitting at my favorite corner table, enjoying a cup of coffee and a plate of bacon and eggs. While scanning the front page of the Record-Eagle, I noticed a man sitting alone at a table facing me. He was looking my way and talking but I couldn’t make out what he was saying. I wondered why he would be talking to me, since I had never seen him before.
As it turned out, he had a hands-free cellphone and was carrying on a conversation with someone else. The dialog continued throughout his meal. After paying the bill he took his conversation into the parking lot and probably on down the highway. I wonder if he remembered what he had eaten for breakfast. Have we become obsessed with always being electronically in touch?
When leaders of the Laser Interferometer Gravitational-wave Observatory, or LIGO, announced in February the first-ever direct detection of a gravitational wave, astrophysicists Scott Ransom from the National Radio Astronomy Observatory and Andrea Lommen at Franklin and Marshall University in Lancaster, Pennsylvania, had mixed feelings.
On the one hand, it meant that the team they and others lead, which searches for gravitational waves using radio telescopes aimed at special stars called pulsars, would not score the first detection. “We loved the idea of being kind of a dark horse,” Ransom admitted.
On the other hand, they were thrilled for their colleagues at LIGO—and for gravitational wave astronomy. “I was really excited, for a whole day I think, before I got jealous,” said Lommen. “We’ve all been working in this field that’s had no detections for 20, 30 years—and now we have a detection. People can no longer make fun of us.”
Above all, Ransom, Lommen and their colleagues hope that, like a rising tide, the excitement around the finding will boost all gravitational wave research—including their own.