Tag

White Dwarf

All articles tagged with #white dwarf

gaming23 days ago•21 min saved

Chaos Reigns as The Old World Unveils Next Week’s Pre-Orders

Warhammer Community’s Sunday Preview outlines next week’s pre-orders across The Old World, led by Chaos on a dragon and the Champions of Chaos, plus Chaos Warriors and Chaos Knights, and Battle March sets; Blood Bowl adds Morg ‘n’ Thorg, a Minotaur, and a Rat Ogre (with Sevens content), while White Dwarf 527, a Bjorn the Fell-Handed Limited Edition, Arcane Journal and Arcane Magic Ploys Card Pack, Warhammer+ features, and related lore/painting content are showcased.

via Warhammer Community|

#blood-bowl #chaos #gaming

gaming27 days ago•13 min saved

White Dwarf 527: Fresh Warhammer 40,000 Lore, Rules, and Jade Abbey Missions

White Dwarf issue 527 previews the new Warhammer 40,000 edition, bridging Armageddon events with fresh lore, introduces Space Marines and Orks, and includes a 16-page designer’s commentary on terrain objectives, missions, and movement, plus an Orks vs Blood Angels battle report. It also adds Warhammer Quest: Darkwater rules for the Jade Abbey, offers hobby tips and painting guides, and features a five-part Skaven fiction arc; the issue goes up for pre-order on August 8 with a 12-month subscription option.

via Warhammer Community|

#armageddon #gaming #jade-abbey

space1 month ago•121 min saved

Milky Way Helium Nova Unleashes Cosmic Bullets at 20 Million mph

Using Hubble, plus NASA’s TESS and ground-based telescopes, astronomers confirmed that the Milky Way’s only known helium nova, V445 Puppis, blasts out fast, oxygen-rich clumps—‘bullets’—traveling about 20 million mph. The system comprises a white dwarf accreting helium from a companion helium-star, a rare binary that sheds light on hydrogen-poor stellar explosions and their potential links to Type Ia supernovae; debris clearing over two decades allowed a clearer view of the eruption and hints that another nova could occur.

via Space|

#binary-star #helium-nova #hubble-space-telescope

space1 month ago•10 min saved

Galaxy’s rare helium nova blasts out mysterious gas bullets

Astronomers confirm the Milky Way’s only known helium nova, V445 Puppis, is ejecting gas at speeds up to 20 million mph, including unusual oxygen-rich “bullets” from post-outburst material, providing new insights into nova explosions and their possible connection to Type Ia supernovae.

via The Independent|

#astronomers #helium-nova #space

space1 month ago•10 min saved

Rare helium nova in our galaxy reveals unusual stellar fireworks

Astronomers have confirmed the galaxy’s first helium nova, V445 Puppis, a binary system where a white dwarf siphons material from a helium-star companion; after a dust-enshrouded outburst around 2000, the now-visible ejecta include oxygen-rich “bullets” racing through space at up to 20 million mph. Studying this rare explosion helps illuminate how such novae occur and could shed light on the origins of Type Ia supernovae, which are used as standard candles to gauge cosmic distances.

via The Independent|

#astronomers #astrophysics #helium-nova

space1 month ago•7 min saved

Jupiter-sized survivor orbits a cooling white dwarf, defying expectations

Astronomers using the James Webb Space Telescope studied WD 1856 b, a Jupiter-sized planet that survived its Sun-like star’s red-giant phase and now orbits a cooling white dwarf about 75 light-years away. The eight-minute grazing transit revealed an atmosphere with methane and hazes, and a surprisingly hot around-400 K temperature, indicating internal reheating rather than just re-radiating energy from the star. The data favor a late inward migration caused by gravitational interactions with distant stellar companions over a common-envelope origin, suggesting more planetary survivors may await discovery near nearby white dwarfs.

via Ars Technica|

#gas-giant #jwst #planetary-migration

science1 month ago•5 min saved

Cold Milky Way Objects Might Be Alien Dyson Swarms Around Small Stars

A new study proposes that some of the Milky Way’s coldest objects, currently catalogued as stars, could be Dyson swarm energy collectors built by advanced civilizations around red and white dwarfs. Such systems would absorb visible light and re-emit heat as infrared, altering their position on the Hertzsprung–Russell diagram and creating distinctive, cleaner infrared spectra and irregular brightness changes. Astronomers are using JWST and projects like Hephaistos to search for these signatures and distinguish them from natural dust clouds.

via The Times of India|

#alien-megastructure #dyson-swarm #infrared-signature

space1 month ago•13 min saved

Webb Reveals Atmosphere on a Jupiter-sized World Orbiting a White Dwarf

NASA’s James Webb Space Telescope detected an atmosphere around WD 1856 b, a Jupiter-sized planet that orbits the Earth-sized white dwarf WD 1856+534—marking the first atmospheric detection for a world around a dead star. Transmission spectroscopy during a transit revealed hydrocarbons, likely methane, plus a hazy cloud layer and a faint glow from the planet’s night side, indicating residual heat. The planet, about 80 light-years away, completes a close 34-hour orbit and is roughly seven times wider than its star, suggesting a past heating event and likely inward migration after the star’s transformation. The team plans additional Webb transits to better pin down its chemistry and formation history.

via Space Daily|

#jwst #methane #space

space1 month ago•104 min saved

JWST spots a Jupiter-sized world dancing around a white dwarf, hinting at our Sun’s distant fate

Astronomers using the James Webb Space Telescope observed WD 1856 b, a Jupiter-sized exoplanet transiting a white dwarf about 80 light-years away. The planet completes an ultra-tight 1.4-day orbit and is hotter than expected, likely due to past heating during the star’s red giant phase or inward migration. The team proposes two possible migration scenarios and notes that JWST’s capabilities enable studying planets orbiting stellar remnants, offering a forward look at the solar system’s distant future. The findings, published in Nature, also highlight the challenge of catching such a transit, which lasts about eight minutes.

via Space|

#exoplanet #james-webb-space-telescope #planetary-migration

space1 month ago•191 min saved

Giant planet around a dead star offers a peek into our solar system’s future

Astronomers using the James Webb Space Telescope have spotted WD 1856 b, a Jupiter-sized exoplanet orbiting a dead white dwarf about 80 light-years away. The planet completes a 34-hour orbit at under 2 million miles from its star, with atmospheric methane detected and a temperature around 127°C, suggesting the planet migrated inward after the star died; two proposed histories—the engulfment of the planet by the star or gravitational interactions with other bodies—could explain its current orbit, though heating timing favors migration after death. This system offers a preview of how giant planets might survive and evolve when their host stars die, hinting at the distant fate of Jupiter and Saturn in our own solar system.

via CNN|

#exoplanet #jwst #planetary-migration

space1 month ago•8 min saved

JWST Discovers a Planet’s ‘Second Life’ Around a White Dwarf

Using JWST, scientists observed WD 1856b, a giant planet about 82 light-years away that orbits a white dwarf, finding its atmosphere and surprisingly high temperature (~126 C) and mass (~7 Jupiter masses). The system features the deepest known exoplanet transit (56%), and the results suggest a “second life” for giant planets after their star dies—potentially heated by a nearby binary—and open a new field of post-main-sequence planetary atmospheres, while the idea of a rocky planet in a white-dwarf habitable zone remains speculative.

via ScienceAlert|

#exoplanet #jwst #planetary-atmospheres

astronomy1 month ago•64 min saved

Methane, aerosols and a warm nightside on a planet circling a white dwarf

JWST/NIRSpec PRISM transmission spectra of WD 1856 b, a Jupiter-sized planet transiting a nearby white dwarf, reveal methane and other hydrocarbons, a scattering aerosol haze, and a nightside thermal emission. The atmosphere is metal-rich (CH4 at a few percent to ~7–20% in retrievals) with an opaque cloud deck near 100 mbar, and the planet’s nightside temperature is about 390–412 K, much warmer than the 160 K equilibrium expected for this system. Mass is constrained to ~4.3–10.9 Jupiter masses. The data imply a reheating event during migration into the white dwarf phase, most consistent with high-eccentricity migration and tidal circularization rather than common-envelope evolution, offering a rare window into the fate of giant planets around Sun-like stars after stellar death.

via Nature|

#aerosols #astronomy #exoplanet-atmosphere

science1 month ago•53 min saved

JWST reveals planets may survive their star’s death

A James Webb Space Telescope study of the Jupiter‑sized exoplanet WD 1856 b orbiting a white dwarf shows that planets can survive the death of their star and even migrate inward, with measurements of its mass, temperature, and atmosphere suggesting past heating during the star’s red‑giant phase. This provides a forward glimpse into our solar system’s fate: in about 5 billion years the Sun will become a red giant, likely destroying the inner planets (Mercury, Venus, possibly Earth) while more distant worlds may endure in altered orbits, illustrating that stellar death can reshape—but not necessarily end—planetary systems.

via Yahoo|

#earth #james-webb-space-telescope #science

gaming1 month ago•14 min saved

Dawn of War IV returns in White Dwarf 526 with exclusive interview, decals, and a Chaos–Cathay Battle Report

White Dwarf issue 526 centers on the Dawn of War IV revival, including an exclusive interview with Creative Director Jan Theysen, a free transfer sheet with over 350 decals for Gabriel Angelos and the Blood Ravens, and a step-by-step painting guide for their crimson color scheme. The issue also features a Genestealer Cults showcase by Mark Kilburn and a World of Legend Battle Report where Chaos advances on Grand Cathay, teased by Miao Ying and the new Warriors of Chaos miniatures, plus coverage of Ciaphas Cain’s new miniature and pre-order/subscription details for White Dwarf 526.

via Warhammer Community|

#ciaphas-cain #dawn-of-war #gaming

space1 month ago•112 min saved

Earth May Outlive the Sun: A Delicate Cosmic Tug-of-War Could Spare Our World

New stellar-evolution models and observations of a nearby dying star suggest Earth could survive the Sun’s giant phases if solar mass loss dominates over tidal forces, allowing Earth to move outward rather than be engulfed. Mercury and Venus are still expected to meet a fiery end, but the outcome hinges on how much mass the Sun will lose—an uncertainty researchers are currently trying to resolve, with future missions like PLATO expected to help. A Letter to the Editor in Astronomy & Astrophysics outlines these calculations and the remaining questions about Earth’s ultimate fate.

via Live Science|

#earth #planetary-fate #space