Articles tagged with Gravitational Microlensing
A team of astronomers used JWST to detect the motion of stars near a galaxy's center affected by a dormant black hole's gravity. The findings suggest that densest galaxies were sites of rapid black hole growth early in cosmic history.
Researchers found that super-Earths can exist far from their host star like gas giants do from the sun. The team's results suggest these massive worlds are prevalent across the universe, with at least one super-Earth present for every three stars.
Scientists have discovered a scrawny star and its fast-moving super-Neptune world, which sets a new record for the fastest exoplanet system. The planetary system is thought to move at least 1.2 million miles per hour.
A team of astronomers discovered a planetary system that resembles the sun-Earth system, with an Earth-size companion in an orbit twice as large as Earth's today. The discovery provides insight into the evolution of main sequence stars and their impact on planets.
A team of scientists from the University of Warsaw detected a population of massive black holes, which could comprise at most a few percent of dark matter. The findings were published in Nature and the Astrophysical Journal Supplement Series.
A new study by NASA and Japan's Osaka University suggests that rogue planets, drifting through space without a star, may outnumber stars with orbiting worlds. The Roman Space Telescope could discover up to 400 Earth-mass rogue planets, according to the findings.
A team of astronomers has directly measured the mass of a dead star using gravitational microlensing, a phenomenon predicted by Einstein's General Theory of Relativity. The measurement, made for an isolated white dwarf called LAWD 37, provides new insights into star evolution and testing current theories of how white dwarfs evolve.
Astronomers using NASA's Hubble Space Telescope have directly measured the mass of a lone white dwarf for the first time. The white dwarf, LAWD 37, has a mass of 56% that of our Sun, corroborating current theories of how white dwarfs evolve.
Researchers at UC Berkeley have detected a possible free-floating black hole in the Milky Way galaxy using gravitational microlensing. The object's mass is estimated to be between 1.6 and 4.4 times that of the sun, but its nature as a black hole or neutron star remains uncertain.
A machine learning algorithm has outperformed astronomers in analyzing microlensing data to find new exoplanets, revealing connections hidden in complex mathematics from general relativity. The AI algorithm uncovered a degeneracy that had been missed by experts, suggesting a broader theory is likely incomplete.
Recent research uses gravitational waves to assess what fraction of dark matter could be in the form of massive primordial black holes. The study sets an upper limit of less than half for such heavy black holes within a mass range of 100 to 100,000 solar masses.
The Kepler Space Telescope has discovered four new planets that are consistent with Earth-sized masses and may be free-floating in space. These findings suggest the existence of a population of free-floating planets, which could have been ejected from host stars by gravitational forces.
The Roman mission will use microlensing to detect exoplanets in the Milky Way galaxy, uncovering thousands of worlds similar to those in our solar system. The survey will also reveal extreme planets and planet-like bodies, including hot Jupiters and brown dwarfs, thanks to their gravitational tug on stars.
Astronomers detect tiny free-floating planet with timescale of just 42 minutes, shedding light on turbulent past of young planetary systems. The discovery demonstrates that low-mass free-floating planets can be detected and characterized using ground-based telescopes.
The Roman Space Telescope will detect hundreds of rogue planets using microlensing surveys, improving our understanding of planetary demographics. The mission aims to narrow down competing models of planetary formation by studying isolated planets with masses as small as Mars.
Astronomers at Kazan Federal University used a powerful space exploration tool to discover a new binary star system. The team employed the gravitational lensing method to track changes in brightness and confirm the presence of two stars.
Researchers confirmed an exoplanet with a mass like Neptune, orbiting a cooler star at a similar radius to Earth's orbit. The discovery suggests Neptune-sized planets could be common in this region.
The study predicts that WFIRST will find about 100 of those not-yet-discovered planets could have the same or lower mass as Earth. The telescope will map the Milky Way and other galaxies 100 times faster than Hubble Space Telescope, scanning a small piece of the universe with high resolution.
A team of astronomers has found an intermediate-mass exoplanet, OGLE-2012-BLG-0950Lb, with a mass of 39 times that of Earth, which contradicts the current understanding of planet formation. The discovery was made using microlensing, a method sensitive to sub-Saturn planets in Jupiter-like orbits.
Researchers detected objects in extragalactic galaxies with masses ranging from the Moon to Jupiter using microlensing. The discovery marks the first time planets have been found outside the Milky Way galaxy.
A new study found that gravitational waves detected by LIGO likely originated from black holes formed during star collapse, rather than primordial black holes. The research used computer simulations to rule out the existence of intermediate-mass primordial black holes.
Researchers found that Neptune-mass worlds are likely the most common type of planet to form in icy outer realms. The study provides insight into the types of planets waiting to be found far from a host star, where scientists suspect planets form most efficiently.
Researchers at the University of Waterloo developed a new detection method that will detect approximately 10 black holes per year, doubling the current number within two years. This method combines microlensing and radio wave interferometry to extract parameters such as mass, distance, and velocity from black hole events.
A team of Spanish researchers has accurately detected a structure in the innermost region of a quasar at a distance of over 5 billion light-years using the gravitational microlensing effect. This breakthrough will help us better understand how galaxies were born and evolve.
Astronomers confirm exoplanet orbiting far from its central star using gravitational microlensing, opening new discovery space for long-period orbits. The Uranus-sized planet is about 370 million miles from its parent star, with a host star about 70% as massive as our Sun.
A recent study found that a large fraction of planets have orbital distances between 0.5 and 10 sun-Earth distances, challenging the previous assumption that most extrasolar planets were gas giants closer to their stars.
A team of astronomers using gravitational microlensing detected three exoplanets, including a super-Earth and planets comparable to Neptune and Jupiter. Combining this data with previous findings, the researchers conclude that planets are more common than stars in the Milky Way.
Astronomers detect first low-mass star in globular cluster M22 using gravitational microlensing, suggesting alternative explanation for cluster mass. The star has less than a fifth of the sun's mass and is 3.2 kiloparsecs from it.
A recent study using data collected between 2006 and 2007 found evidence for 10 free-floating planets roughly the mass of Jupiter, suggesting they are common. The discovery supports the 'ejection' scenario where planets are kicked out from their solar systems due to close gravitational encounters with other planets or stars.
Bennett's team found 10 free-floating planets roughly the mass of Jupiter, suggesting planetary systems often become unstable, ejecting planets from their orbits. The discovery confirms that free-floating planets exist and are quite common, estimated to be twice as many as stars.
Researchers are exploring the possibility of life on giant, cold planets called Super-Earths that could harbor a liquid ocean beneath their icy surface. The team uses a novel approach involving gravitational microlensing to detect these potentially habitable worlds.
A team of astronomers led by David Bennett discovered a planet with a mass about three times that of Earth, orbiting a star with a mass 6% of the sun's, potentially hosting conditions suitable for life. The discovery was made using the gravitational microlensing method and confirms predictions made in 1996.
The discovery of the double planet system provides crucial evidence for the presence of multiple planet systems similar to our own solar system. The findings suggest that if OGLE-2006-BLG-109L is typical, it is possible that other systems have Jupiter- and Saturn-sized planets.
Researchers have discovered a multi-planet system with two large planets similar to Jupiter and Saturn, suggesting that planetary systems like our own may be common in the Milky Way galaxy. This is the first discovery of its kind, using a new gravitational microlensing technique.
An international team of astronomers has discovered two planets resembling smaller versions of Jupiter and Saturn in a solar system nearly 5,000 light years away. The newly-discovered planets appear to be gaseous planets with masses similar to those of the giant planets in our own solar system.
Astronomers propose that super-Earths can form around red dwarf stars via ultraviolet stripping, a process previously thought to only create gas giant planets. The new theory suggests that the mass of the central star determines whether a planet forms as a gas giant or a super-Earth.
Astronomers discover an Earth-like planet with a solid core, orbiting a red dwarf star five times less massive than the sun. The discovery, made using microlensing technique, reveals thousands of potentially habitable planets in distant parts of the galaxy.
The discovery of OGLE-2005-BLG-390Lb provides strong evidence that low-mass planets, potentially supporting life, are more common than Jupiter-like gas giants. Researchers hope the gravitational microlensing technique will reveal more habitable worlds in the Milky Way galaxy.
Astronomers have found a small planet with a mass about five times that of Earth, orbiting a small star near the center of the galaxy. The discovery suggests there are many other small planets in habitable zones, where temperatures are moderate enough for liquid water to appear on their surfaces.
Astronomers have detected a rocky, icy planet about five-and-a-half times the mass of Earth, located over 20,000 light years away. The discovery was made possible by gravitational microlensing, which may lead to finding smaller planets in habitable zones around stars.
Astronomers have discovered the first and only icy exoplanet that matches theoretical predictions for Solar System formation. OGLE-2005-BLG-390Lb orbits a small red star at an extremely close distance, with a surface temperature of -220°C, and is likely to resemble Pluto more than rocky planets like Earth.
Astronomers have directly measured the mass of a single star, the first time this feat has been accomplished for any star other than our own sun. The star, nearly 2,000 light-years away, was found to have one-tenth the mass of the Sun using a combination of old and new astronomical techniques.
Researchers from Ohio State University have successfully measured the mass of a gravitational microlens in a dim binary star system 6,500 light-years away. This technique could be used to detect dark matter within our galaxy and help explain the missing mass of the universe.
Researchers from the Lawrence Livermore National Laboratory have detected a dark matter object in the Milky Way using microlensing light data and spectroscopy. The team measured the mass, distance, and velocity of the MACHO, a small star with a mass between 5% and 10% of the sun's mass at a distance of 600 light-years.
Researchers have detected a massive compact halo object, or MACHO, using gravitational microlensing event data from the Hubble Space Telescope and European Southern Observatory's Very Large Telescope. The object is estimated to be 5-10% the mass of the sun and is thought to comprise up to 50% of the Milky Way's dark matter content.
NASA's Hubble Space Telescope has detected unusual microlensing events in the M22 globular cluster, hinting at a new population of wandering, planet-sized objects. These bodies are estimated to have masses as low as 80 times that of Earth, a discovery that could challenge current understanding of celestial mechanics.
Astronomers have discovered over 154 rapidly moving stars towards the center of the Milky Way and its brightest neighboring galaxy. The findings are significant as these stars were previously difficult to detect due to their extreme density, allowing scientists to gain insights into the galaxy's most densely packed regions.