Articles tagged with White Dwarfs
Researchers used NASA's IXPE telescope to study the innermost region of an intermediate polar, revealing a surprisingly high degree of X-ray polarization and an unexpected direction of polarization. The team found that X-rays were emitted from a column of white-hot material pulled in by the white dwarf's strong magnetic field.
Recent studies reveal a class of short period binary systems where white dwarfs are inflated and their surface temperatures can reach 10-30 thousand degrees Kelvin. Tidal forces can strongly influence the evolution of these stars, causing them to inflate and increase in temperature.
Astronomers detected phosphine in the atmosphere of a cool, ancient brown dwarf named Wolf 1130C using the James Webb Space Telescope. The discovery challenges previous theories and suggests that phosphorus chemistry might be more complex than initially thought.
Astronomers detected water ice and nitrogen in fragments torn apart from a Kuiper Belt analog, revealing the presence of volatile-rich material. The discovery sheds light on planet formation and the delivery of water to rocky planets.
Astronomers have discovered a frozen, water-rich planetary fragment being consumed by a white dwarf star outside our Solar System. The object is thought to be an icy planetesimal, possibly similar to Halley's Comet or Pluto, and has a high nitrogen abundance, making it a rare finding in the field.
Astronomers discovered a greedy white dwarf star consuming its closest celestial companion at an unprecedented rate. The study found that the super-dense white dwarf is burning brightly due to the mass transfer between the two stars, potentially leading to a massive explosion visible from Earth.
Researchers have discovered a rare white dwarf remnant with a carbon signature, suggesting it formed from the merger of two stars. The high-mass white dwarf, WD 0525+526, has a thin atmosphere that allows carbon to reach its surface, providing insights into the early stages of stellar evolution.
Kilonova Seekers, a public participation project, has announced its first major discovery - a bright exploding star named GOTO0650. The team collected highly complete dataset on the star through fast response from volunteers, suggesting it's a period bouncer and rare object to find in wide-field imaging surveys.
Warwick astronomers have discovered the first double white dwarf binary system, which will explode as a type 1a supernova in 23 billion years. The system is located 150 light-years away and consists of two compact white dwarfs with a combined mass of 1.56 times that of the Sun.
Astronomers have discovered entwined dwarf stars emitting radio pulses, challenging the long-held assumption that only neutron stars were responsible for these emissions. The discovery was made using follow-up observations of two stars orbiting each other every two hours.
An international team has traced radio pulses to a binary system with a dead star, where a red dwarf and white dwarf orbit each other, emitting a radio blast every two hours. This discovery shows that the movement of stars within a binary system can also emit long-period radio bursts.
Researchers have discovered that radio pulses lasting seconds to minutes are due to two stars coming together, rather than emissions from a single star. The study used a novel imaging technique to detect periodic radio signals in data taken with the Low Frequency Array (LOFAR), an international radio telescope.
The Einstein Probe mission aims to probe X-ray transient sources and explosive astrophysical phenomena, contributing significantly to astronomical research. The mission's sophisticated observational instruments will enhance the detection of sudden X-ray transients and monitor variability in known celestial sources.
Astronomers observe an ultra-hot nova, LMC68, using Gemini South's FLAMINGOS-2 instrument, detecting ionized silicon atoms. The signal is unprecedented, shining up to 100 times brighter than the Sun. This is the first near-infrared spectroscopic observation of an extragalactic recurrent nova.
Scientists discovered a rare binary system consisting of a massive Be star and a compact white dwarf, with the Einstein Probe catching the X-ray signal from its initial flare-up to its fading away. The analysis revealed clues about the elements present in the exploding material, including nitrogen, oxygen, and neon.
The release of a unique Type Ia Supernovae dataset has significant implications for cosmologists measuring the universe's expansion history. The dataset, comprising 3628 supernovae, provides unprecedented precision and accuracy in exploring the properties of these events.
A new dataset of nearly 4,000 nearby supernovae has revealed a surprising diversity in the explosive transients of white dwarf stars, with multiple exotic ways they can blow up. These discoveries have implications for measuring distances in the Universe and understanding dark energy.
Researchers found that white dwarf exoplanets could have more habitable surface area than previously thought due to their fast rotation periods. The study suggests these stars may present new avenues for exoplanet and astrobiology research.
Astronomers have observed the same supermassive black hole exhibiting unprecedented behavior, with X-ray flashes increasing in frequency over two years. The source of these flashes is believed to be a spinning white dwarf core orbiting around the black hole's edge.
The Hubble Space Telescope has discovered a rare blue lurker star in the open cluster M67, which is spinning much faster than expected. The star's unusual behavior suggests it siphoned material from a companion star, leading to its high spin rate and unique evolutionary history as part of a triple-star system.
A study of over 26,000 white dwarf stars confirmed that hotter stars are slightly larger due to higher temperatures. This finding brings scientists closer to understanding the effects of extreme gravity and potentially detecting dark matter particles.
Researchers identified a group of unusual objects emitting long-duration outbursts of X-rays, which may be caused by binary star systems with white dwarfs and subgiant stars. The discovery of millinovae could provide insights into the astrophysics of Type Ia supernovae.
The discovery provides a unique way to investigate the extreme phase of stellar evolution, bridging the gap between the earliest and final stages of binary star systems. This breakthrough could help explain cosmic events like supernova explosions and gravitational waves.
Researchers from DTU have discovered a neutron star that rotates at an astonishing 716 times per second, making it one of the fastest-spinning objects ever observed. The neutron star is part of an X-ray binary star system and is located in the Sagittarius constellation.
Astronomers have studied the last unexplained historical supernova from 1181 AD, known as SN 1181, in detail. The team discovered a 'zombie star' at its center and dandelion-shaped filaments emanating from it.
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.
Astronomers using NASA's Hubble Space Telescope discovered that the blowtorch-like jet from a supermassive black hole at the core of a huge galaxy causes stars to erupt along its trajectory. The finding suggests that there is something missing from our understanding of how black hole jets interact with their surroundings.
Researchers recreated the structure of supernova remnant SN 1181 using a new computer model, explaining its double shock formation. The study also found that high-speed stellar winds may have started blowing from its surface within the past 20-30 years.
Astronomers have used Hubble and SOFIA to study the HM Sge binary star system, which experienced a sudden increase in brightness 40 years ago. The team has found that the system's temperature has increased, but paradoxically faded slightly, raising questions about its long-term behavior.
Astronomers have detected a neutron star spinning at an unprecedentedly slow rate, defying the typical mind-bending speeds of these ultra-dense stars. The object emits radio signals every 54 minutes, offering new insights into its complex life cycle and potential implications for our understanding of stellar objects.
Researchers propose a new theory explaining how some white dwarfs remain hot for billions of years, contradicting the standard picture of cooling. The theory suggests buoyant crystals form in the star's interior, disrupting its cooling process and releasing gravitational energy.
Researchers have discovered a unique signature of planetary material ingestion on the surface of a white dwarf star, WD 0816-310. The team observed a concentration of metals imprinted on the star's surface, indicating that the magnetic field played a key role in this process.
Astronomers combined the Webb and Hubble telescopes to capture a detailed portrait of the cosmos, revealing a galaxy cluster about 4.3 billion light-years from Earth. The image showcases magnified supernovae and individual stars, providing insights into the universe's first stars and the forces driving its expansion.
Astronomers have discovered a white dwarf star with drastically different faces, composed of hydrogen on one side and helium on the other. The team believes magnetic fields may be responsible for the asymmetric sides, allowing a 'hydrogen ocean' to form where the fields are strongest.
Scientists have discovered a rare type of white dwarf pulsar, shedding light on stellar evolution and the origin of strong magnetic fields. The newly detected pulsar, J1912-4410, has a size similar to Earth but a mass at least as large as the Sun.
Classical novae are found to be more complicated than previously thought, emitting non-thermal energy and displaying hyper-fast evolution. The discovery uses Very Long Baseline Array (VLBA) to provide a detailed picture of the main complication, expanding our understanding of these events.
Astronomers from Stockholm University detected the first radio emission of a Type Ia supernova, providing evidence for helium-rich circumstellar material. The discovery sheds light on the origins of these explosions and their role in measuring the expansion of the Universe.
Researchers studied a Type 1a supernova in a faraway spiral galaxy, NGC 1566, to understand how certain chemical elements are emitted into the surrounding cosmos. The study confirms that ejecta doesn't escape the confines of the explosion, validating many assumptions about how complex entities work.
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.
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.
Researchers discovered a long-duration gamma-ray burst that defied prevailing theories, leading to the proposal of a new model for its origin. The unusual burst was found to have characteristics similar to those of short-duration bursts, challenging current understanding of gamma-ray burst formation.
Astronomers discovered that the building blocks of planets like Jupiter and Saturn form while their parent star is still growing. The study analyzed spectroscopic observations from polluted white dwarfs, which revealed signs of asteroid melting, indicating a rapid process of planet formation.
Astronomers have discovered a stellar binary with an extremely short orbit of just 51 minutes, confirming a decades-old prediction. The system is believed to be a cataclysmic variable, in which a white dwarf is accreting material from its companion star.
Astronomers observe white dwarf star G238-44 siphoning off debris from inner and outer reaches of its planetary system, revealing insights into planetary system evolution. The study provides unique opportunity to analyze elements in planets apart and shed light on conditions of planetary formation.
A new study suggests that the Hypatia Stone, discovered in Egypt, may be the first tangible evidence on Earth of a supernova type Ia explosion. The stone's unique chemistry and elemental composition contradict conventional views of solar system formation, potentially revealing a long-hidden secret about our cosmic neighborhood.
A research team has observed an explosion on a white dwarf star for the first time, producing X-ray radiation. The explosion was detected by the eROSITA X-ray telescope and is believed to have occurred in a fireball of X-rays with a temperature of around 327,000 degrees.
Researchers used computer modeling to simulate the long-term evolution of a hypothesized type of supernova, known as D6. The study found that remnants of type Ia explosions are not necessarily symmetric, offering new insights into supernova physics. This finding has significant implications for using Ia supernovae as cosmic yardsticks.
A team of astronomers has discovered micronovae, extremely powerful events that occur on the surface of white dwarfs and can burn through billions of kilograms of material in a few hours. These new stellar explosions challenge our understanding of thermonuclear reactions in stars and may be more abundant than previously thought.
The MAGIC telescopes detected gamma rays with energies of 250 gigaelectronvolts from the RS Ophiuchi nova, a hundred billion times more energetic than visible light. This suggests that nova outbursts are a source of cosmic rays, specifically accelerated protons and nuclei of hydrogen atoms.
A recent study from Lund University reveals new information about the movement patterns of white dwarfs in the Milky Way. The researchers mapped the three-dimensional velocity distribution for the largest catalogue of white dwarfs to date, providing a detailed picture of their velocity structure.
Research reveals a cosmic particle acceleration process in a stellar nova, accelerating particles to extreme energies. The observation suggests that the acceleration process could be efficient in supernovae, providing new insights into astrophysics.
Researchers have discovered a strange new type of star with surfaces composed of carbon and oxygen, the by-product of helium burning. The stars' unusual composition suggests they may have formed through rare stellar mergers, but current models cannot fully explain their origins.
Researchers have discovered a ring of planetary debris orbiting close to a white dwarf star, suggesting the presence of a nearby planet in the habitable zone. The planet is thought to be similar in size to terrestrial planets in our solar system and could support liquid water, making it potentially habitable.
A team of researchers detected a ring of planetary debris surrounding the white dwarf WD1054–226, suggesting a nearby planet may be present in its habitable zone. The study found that the debris is kept in a precise arrangement by a nearby planet's gravitational influence.
Astronomers have observed the moment that debris from destroyed planets impacts a white dwarf star for the first time, confirming decades of indirect evidence. The event was detected using X-rays and provides direct measurement of accretion of rocky material onto a white dwarf.
Astronomers have discovered a binary system consisting of a rapidly spinning neutron star and the precursor to an extremely-low-mass white dwarf, dubbed a 'cosmic spider'. The system emits powerful gamma-rays and has been observed using the SOAR Telescope in Chile.
Astronomers have detected a white dwarf star that spins at an incredible rate of once every 25 seconds, completing one rotation faster than Earth. The star is thought to be the size of the Earth but massive enough to pull material from its companion star, creating a magnetic propeller system.
Researchers detected giant gas planet with Jupiter-like orbit around white dwarf star, confirming planets can exist beyond star death; study suggests Jupiter and Saturn may survive Sun's red giant phase.
Researchers have solved the 900-year-old mystery of the Chinese supernova of 1181AD by identifying a matching nebula and star in the Milky Way. The Pa30 nebula, surrounding Parker's Star, matches the profile, location, and age of the historic supernova.
The Hubble Space Telescope has discovered white dwarfs that burn hydrogen on their surface, slowing down their cooling rate. This finding challenges the conventional view of white dwarfs as inert, slowly cooling stars.