Tag

Type Ia Supernova

All articles tagged with #type ia supernova

science2 months ago•4 min saved

Emerging Evidence Indicates Universe's Expansion Is Slowing, Challenging Dark Energy Theories

New research suggests that the universe's expansion may be slowing down and dark energy might not be accelerating it anymore, potentially marking a major shift in cosmological understanding. This conclusion is based on findings that challenge the standard model of dark energy, indicating the universe has already entered a phase of decelerated expansion, with future observations from the Vera C. Rubin Observatory expected to further test these results.

via Space|

#cosmology #dark-energy #desi

science6 months ago•4 min saved

Astronomers Capture First Image of a Star That Exploded Twice

Astronomers have captured the first visual evidence of a white dwarf star undergoing a double detonation, where it explodes twice, challenging previous understanding that such stars only explode once after reaching the Chandrasekhar limit. Using the VLT, they studied supernova SNR 0509-67.5, revealing structures indicating a double explosion, which could reshape theories about supernova mechanisms and their role as cosmic distance markers.

via Space|

#astronomy #double-detonation #science

astronomy2 years ago•2 min saved

"Studying the Evolution of a Nearby Type Ia Supernova"

Astronomers have conducted photometric and spectroscopic observations of a nearby Type Ia supernova, SN 2020nlb, providing important insights into its evolution. The observations revealed that SN 2020nlb faded faster than an average Type Ia supernova, suggesting lower luminosity. Spectra showed similarities to other supernovae at early stages, but evolved to become hotter and more similar to a different type as it brightened. The nebular spectra indicated potential differences between SN 2020nlb and the bulk of normal Type Ia supernovae.

via Phys.org|

#astronomy #evolution #sn-2020nlb

astronomy2 years ago•3 min saved

"Groundbreaking Discovery: Unprecedented Radio Waves Detected from Type Ia Supernova"

Astronomers have detected radio waves from a Type Ia supernova for the first time, shedding light on the explosion mechanism and the conditions leading up to these events. The observations revealed that the supernova was surrounded by helium-rich circumstellar material, indicating that the white dwarf star had been accreting material from a companion star. This breakthrough observation provides important insights into the role of mass accretion in triggering Type Ia supernovae and opens up new avenues for further research.

via SciTechDaily|

#astronomy #circumstellar-material #helium-rich-environments

astronomy2 years ago•4 min saved

"Rare Gravitational Einstein Cross Unveils Four Copies of Distant Supernova, While a Bright Supernova Illuminates the Night Skies"

An international team of researchers has discovered a distant supernova, named SN Zwicky, using gravitational lensing. The supernova, located 4 billion light-years away, is a type Ia supernova, which is used as a "standard candle" to measure distances in space. The discovery was made at the Zwicky Transient Facility (ZTF) in California, and further observations at the Keck Observatory and the Hubble Space Telescope confirmed the presence of four distinct images of SN Zwicky. The arrival time of the four images at Earth was almost simultaneous, despite traveling along different gravitational paths. Future observations using NASA's James Webb Space Telescope are planned to gain a clearer view of this phenomenon.

via Yahoo Entertainment|

#astronomy #einstein-cross #gravitational-lensing

astronomy2 years ago•4 min saved

"Rare Gravitational Einstein Cross Unveils Quadruple Image of Distant Supernova"

An international team of researchers has discovered a distant supernova, named SN Zwicky, using gravitational lensing. The supernova, located 4 billion light-years away, is a type Ia supernova, which is used as a "standard candle" to measure distances in space. The discovery was made at the Zwicky Transient Facility (ZTF) in California, and further observations at the Keck Observatory and the Hubble Space Telescope confirmed the presence of four distinct images of SN Zwicky. Future observations using NASA's James Webb Space Telescope are planned to gain a clearer view of this unusual phenomenon.

via Syfy|

#astronomy #gravitational-lensing #james-webb-space-telescope

astronomy2 years ago•5 min saved

"Milky Way's Fastest Runaway Star Breaks Records at 5 Million MPH"

Six new runaway stars have been discovered racing through the Milky Way, with two of them moving faster than any object of this type ever seen. These record-breaking stars are traveling at an incredible 5.1 million miles per hour and 3.8 million miles per hour, respectively. The team behind the discovery thinks that the incredible velocity of these four stars could be the result of them being launched by a particular type of cosmic explosion called a Type Ia supernova.

via Space.com|

#astronomy #astrophysics #hypervelocity-stars

astronomy2 years ago•3 min saved

"Record-breaking Speed: Milky Way's Fastest Stars Discovered"

Astronomers have discovered the fastest runaway star ever seen in the Milky Way galaxy, named J0927, which is hurtling through space at a stunning 5.112 million miles per hour. It was spotted alongside three other fast-moving stars, all of which are thought to be the results of a Type Ia supernova. The researchers estimate that D6 supernovas might account for half of all Type Ia supernovas, but to know for certain, they will have to locate even more runaway stars streaking through space.

via Livescience.com|

#astronomy #gaia-star-catalog #hypervelocity-star

astronomy2 years ago•3 min saved

"Stellar Explosions: Latest Discoveries in Supernova Research"

Stockholm University astronomers have discovered an unusual Type Ia supernova called SN 2020eyj, which was detected in radio waves and showed strong helium emissions. This marks the first confirmed Type Ia supernova triggered by a white dwarf star that pulled material from a companion star with an outer layer consisting primarily of helium. Type Ia supernovae are important for measuring the expansion of the universe, and this discovery adds to our understanding of their origins.

via SciTechDaily|

#astronomy #helium-emissions #radio-waves