Tag #Stellar Evolution

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mk.ru

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Aug 25, 01:16

New Supernova Type Challenges Stellar Evolution Models

Astronomers observed supernova SN2021yfj, revealing a new type of stellar explosion where the star shed its outer layers before ejecting a layer of heavier elements just prior to exploding, challenging existing stellar evolution models.

New Supernova Type Challenges Stellar Evolution Models

Astronomers observed supernova SN2021yfj, revealing a new type of stellar explosion where the star shed its outer layers before ejecting a layer of heavier elements just prior to exploding, challenging existing stellar evolution models.

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What is the key finding of the study on supernova SN2021yfj, and what are its immediate implications for our understanding of stellar evolution?

Astronomers observed a new type of supernova, offering unprecedented insight into a star's interior moments before explosion. The event, SN2021yfj, showed the star shedding its outer layers of hydrogen, helium, and carbon before ejecting a layer of heavier elements like silicon, sulfur, and argon, an unprecedented observation.

us.cnn.com

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Aug 23, 01:17

New Supernova Type Challenges Stellar Evolution Models

Astronomers discovered a new type of supernova, SN2021yfj, 2.2 billion light-years away, which lacked typical outer layers and revealed a previously unseen layer of silicon, sulfur, and argon before exploding, challenging existing models of stellar evolution.

New Supernova Type Challenges Stellar Evolution Models

Astronomers discovered a new type of supernova, SN2021yfj, 2.2 billion light-years away, which lacked typical outer layers and revealed a previously unseen layer of silicon, sulfur, and argon before exploding, challenging existing models of stellar evolution.

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What mechanisms could explain the extreme mass loss observed in SN2021yfj, and how does this relate to existing theories of stellar evolution?

This supernova's unusual composition, lacking the typical outer layers, provides direct evidence of the internal structure of massive stars. The expelled silicon, sulfur, and argon layer, illuminated by the explosion, suggests extreme mass loss late in the star's life, potentially due to strong instabilities or interactions with a companion star. This discovery significantly broadens our understanding of stellar death.

welt.de

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Jul 24, 13:14

Faint Companion Star Likely Found Orbiting Betelgeuse

Researchers using the Gemini-North telescope and speckle interferometry have likely detected a faint stellar companion to Betelgeuse, a red supergiant star in Orion, solving a long-standing mystery about its brightness fluctuations; the companion, estimated at 1.6 solar masses, is predicted to be co...

Faint Companion Star Likely Found Orbiting Betelgeuse

Researchers using the Gemini-North telescope and speckle interferometry have likely detected a faint stellar companion to Betelgeuse, a red supergiant star in Orion, solving a long-standing mystery about its brightness fluctuations; the companion, estimated at 1.6 solar masses, is predicted to be co...

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What is the predicted fate of the companion star, and how does this relate to the long-term future of Betelgeuse itself?

The newly discovered companion star faces an inevitable demise within approximately 10,000 years. The immense gravitational forces exerted by Betelgeuse will ultimately consume it. This event is unrelated to Betelgeuse's eventual, though still distant, supernova explosion, predicted to occur thousands of years in the future.

theglobeandmail.com

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Jul 3, 01:13

First Photographic Evidence of Type Ia Supernova's Double Detonation

Astronomers using the European Southern Observatory's Very Large Telescope have obtained the first photographic evidence of a Type Ia supernova, a double-detonation event 160,000 light-years away in the Large Magellanic Cloud, revealing two concentric calcium shells expanding outwards, confirming th...

First Photographic Evidence of Type Ia Supernova's Double Detonation

Astronomers using the European Southern Observatory's Very Large Telescope have obtained the first photographic evidence of a Type Ia supernova, a double-detonation event 160,000 light-years away in the Large Magellanic Cloud, revealing two concentric calcium shells expanding outwards, confirming th...

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What is the significance of the first photographic evidence of a Type Ia supernova's double-detonation mechanism?

Researchers have captured the first photographic evidence of a Type Ia supernova, a double-detonation event involving a white dwarf star. This event, located 160,000 light-years away in the Large Magellanic Cloud, shows two concentric calcium shells expanding outwards, confirming the double-detonation theory. The white dwarf was completely destroyed in the process.

mk.ru

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Feb 11, 07:07

SN 2014C's Unexpected Transition and U-Shaped Circumstellar Material

An international team's study of supernova SN 2014C, located 40–45 million light-years away in the NGC 7331 galaxy, revealed its unexpected transition from type Ib to type IIn supernova, caused by the progenitor star shedding its hydrogen layer before exploding, leaving a U-shaped circumstellar mate...

SN 2014C's Unexpected Transition and U-Shaped Circumstellar Material

An international team's study of supernova SN 2014C, located 40–45 million light-years away in the NGC 7331 galaxy, revealed its unexpected transition from type Ib to type IIn supernova, caused by the progenitor star shedding its hydrogen layer before exploding, leaving a U-shaped circumstellar mate...

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What specific changes in SN 2014C's classification and observed behavior challenged existing supernova models, and what new insights did this reveal about stellar evolution?

An international team, led by Yunnan Observatories of the Chinese Academy of Sciences, published findings in The Astrophysical Journal on SN 2014C, a rare supernova in the Pegasus constellation's NGC 7331 galaxy (40–45 million light-years from Earth). Initially classified as type Ib (lacking hydrogen), SN 2014C unexpectedly transitioned to type IIn (high hydrogen), indicating the progenitor star shed its outer hydrogen layer before exploding, leaving dense circumstellar material (CSM).

edition.cnn.com

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Aug 23, 01:17

Unique Supernova Reveals Unexpected Stellar Interior and Challenges Evolution Models

Astronomers discovered SN2021yfj, a unique supernova lacking typical outer layers, which ejected a layer of silicon, sulfur, and argon before exploding, challenging existing stellar evolution models.

Unique Supernova Reveals Unexpected Stellar Interior and Challenges Evolution Models

Astronomers discovered SN2021yfj, a unique supernova lacking typical outer layers, which ejected a layer of silicon, sulfur, and argon before exploding, challenging existing stellar evolution models.

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What caused SN2021yfj to lose its outer layers and expel a silicon, sulfur, and argon layer before exploding?

This supernova challenges existing stellar evolution models by demonstrating a previously unknown pathway for massive star death. The expelled silicon, sulfur, and argon layer, unseen in other supernovas, indicates extreme mass loss before explosion.

mk.ru

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Aug 23, 10:17

Interstellar Tunnels Discovered Extending from Solar System's Location

New research using the eROSITA X-ray telescope reveals two massive interstellar tunnels emanating from the Local Hot Bubble, our solar system's location, extending towards the Centaurus and Canis Major constellations, possibly part of a larger network shaped by stellar feedback.

Interstellar Tunnels Discovered Extending from Solar System's Location

New research using the eROSITA X-ray telescope reveals two massive interstellar tunnels emanating from the Local Hot Bubble, our solar system's location, extending towards the Centaurus and Canis Major constellations, possibly part of a larger network shaped by stellar feedback.

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How were these tunnels detected, and what is the role of supernova remnants in their formation?

The Local Hot Bubble, a region of hot, less dense plasma, is believed to be a supernova remnant formed 10-20 million years ago. The discovery of these tunnels provides further evidence of this origin, as they appear to be carved out by powerful stellar winds and supernova explosions. These events shape the structure of the Milky Way galaxy.

theglobeandmail.com

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Jul 17, 01:10

Earliest Stages of Rocky Planet Formation Directly Observed

Astronomers using the Webb Space Telescope and the European Southern Observatory have, for the first time, directly observed the earliest stages of rocky planet formation around the young star HOPS-315, 1,370 light-years from Earth, detecting the condensation of silicon monoxide gas and crystalline ...

Earliest Stages of Rocky Planet Formation Directly Observed

Astronomers using the Webb Space Telescope and the European Southern Observatory have, for the first time, directly observed the earliest stages of rocky planet formation around the young star HOPS-315, 1,370 light-years from Earth, detecting the condensation of silicon monoxide gas and crystalline ...

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How do the findings from HOPS-315 compare to existing theories and models of planetary system formation?

The discovery around HOPS-315, a star 100,000-200,000 years old, provides the first direct evidence of the initial stages of rocky planet formation. The observed condensation of minerals in a region analogous to our asteroid belt supports the theory that similar processes occurred in our own solar system's early stages. This finding significantly advances our understanding of planetary system formation.

us.cnn.com

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May 28, 22:12

Discovery of X-ray-Emitting Long-Period Transient Challenges Stellar Evolution Theories

Astronomers detected ASKAP J1832-0911, a celestial object 15,000 light-years away, emitting bright flashes of radio waves and X-rays every 44 minutes; this is the first X-ray detection associated with a long-period transient (LPT), challenging existing theories on stellar evolution and suggesting a ...

Discovery of X-ray-Emitting Long-Period Transient Challenges Stellar Evolution Theories

Astronomers detected ASKAP J1832-0911, a celestial object 15,000 light-years away, emitting bright flashes of radio waves and X-rays every 44 minutes; this is the first X-ray detection associated with a long-period transient (LPT), challenging existing theories on stellar evolution and suggesting a ...

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What is the significance of the discovery of ASKAP J1832-0911, and what immediate implications does it have for our understanding of cosmic objects?

Astronomers have discovered ASKAP J1832-0911, a celestial object emitting bright flashes of radio waves and X-rays every 44 minutes. This is the first time X-rays have been associated with a long-period transient (LPT), a recently identified class of cosmic objects. The discovery challenges existing theories about stellar evolution and suggests a new type of celestial object or a new model of stellar evolution.

forbes.com

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Jan 13, 13:07

Dust Obscuration Solves the Red Supergiant Problem

A new study resolves the 'red supergiant problem' by showing that dust obscured the luminosity of many red supergiant stars, leading to an underestimation of their numbers; this finding is based on data from the Webb and Hubble telescopes and ground-based surveys.

Dust Obscuration Solves the Red Supergiant Problem

A new study resolves the 'red supergiant problem' by showing that dust obscured the luminosity of many red supergiant stars, leading to an underestimation of their numbers; this finding is based on data from the Webb and Hubble telescopes and ground-based surveys.

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How did observational biases, specifically dust obscuration, affect the previous understanding of red supergiant stars and their role in supernovae?

The study, using data from various telescopes including the Webb and Hubble, compared pre-explosion images of RSGs, revealing that previously underestimated luminosity was caused by dust. This resolves the 'red supergiant problem' by demonstrating that the missing high-luminosity progenitors were obscured, not absent.

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