AAS Nova
Research highlights from the journals of the American Astronomical Society
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Latest posts
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Multimessenger Constraints on the Central Engine in SN 2023ixf: Neutron Star or Black Hole?
Maryam Aghaei Abchouyeh et al 2026 ApJ 1006 212 The lack of detected gravitational waves associated with the supernova SN 2023ixf suggests that the event birthed a neutron star rather than a black hole, and the progenitor star’s mass was likely below 20 solar masses. The post…
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Featured Image: A Starburst Galaxy Blows a Bubble
Massive stars near the center of a local starburst galaxy are blowing a bubble that may be starting to "pop." The post Featured Image: A Starburst Galaxy Blows a Bubble appeared first on AAS Nova .
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DPS 58: Days 3 and 4
Days 3 and 4 of the 58th Division for Planetary Sciences meeting brought insights from subsurface ice on Mars, discoveries of Neptune trojans, and stories of advocacy successes. The post DPS 58: Days 3 and 4 appeared first on AAS Nova .
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The Cosmic Sulfur Depletion Problem Extends to Interstellar Object 3I/ATLAS
John W. Noonan et al 2026 ApJL 1007 L42 Hubble Space Telescope observations of 3I/ATLAS show that the comet’s coma is depleted in sulfur, which may be due to its formation in a cold, sulfur-depleted environment that was shielded from ultraviolet light. The post The Cosmic Sulfur…
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Direct Evidence for Outflow Driven by Wolf–Rayet Stars in the Nearby Galaxy PGC 44685
Qian Huang et al 2026 ApJ 1006 167 Observations of a nearby dwarf galaxy suggest that Wolf–Rayet stars are able to shape their environments on subkiloparsec scales, but their winds are not able to drive galaxy-scale outflows. The post Direct Evidence for Outflow Driven by…
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DPS 58: Days 1 and 2
News from the 58th meeting of the AAS Division for Planetary Sciences (DPS): discovering a new dwarf planet candidate in our solar system, cracking mysteries about Europa's ice shell, clarifying our understanding of Titan's hazy dunes, and much more. The post DPS 58: Days 1 and…
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On the Eccentricity Distribution and Tidal Evolution of Transiting Brown Dwarfs
Thiago Ferreira and Malena Rice 2026 AJ 172 111 Short-period brown dwarfs appear to have low orbital eccentricities, while longer-period brown dwarfs appear to have higher eccentricities, likely reflecting the eccentricity-damping timescales of the two populations. The post On…
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Multiband Optical Photometric Variability of the Blazar OJ 287 from 2015 to 2025
Alok C. Gupta et al 2026 ApJS 286 7 Long-term photometric monitoring shows OJ 287 trending bluer when brighter in short- and long-term variability; spectroscopic monitoring suggests a central black hole mass of at least 3.89 billion solar masses. The post Multiband Optical…
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These “Ice Giants” Have a Hot Secret
Astrobites reports on a possible piping-hot secret about the so-called "ice giant" planets in our solar system, Uranus and Neptune. The post These “Ice Giants” Have a Hot Secret appeared first on AAS Nova .
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Seeing Red: New Constraints on Origin of JWST’s Little Red Dots
Supercritical accretion of black holes may drive the formation of enigmatic "little red dots." The post Seeing Red: New Constraints on Origin of JWST’s Little Red Dots appeared first on AAS Nova .
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3D Magnetic Structures of Ellerman Bombs Revealed by SUNRISE III/SCIP
Yusuke Kawabata et al 2026 ApJL 1007 L39 Using a balloon-borne 1-meter telescope, researchers have disentangled the three-dimensional structure of Ellerman bombs, which are identified via brief brightenings in the wings of H-alpha lines. The post 3D Magnetic Structures of…
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Radio Observations of the Unusual Tidal Disruption Event AT 2022wtn: A Fast and Highly Energetic Outflow
Gavin Farley et al 2026 ApJ 1006 139 Astronomers continue to find tidal disruption events with diverse properties; AT 2022wtn is an unusually powerful non-relativistic tidal disruption event potentially exhibiting an accretion disk state transition outflow. The post Radio…
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Anybody Home? Black Hole Occupation Fraction Helps Clarify Galactic History
Most galaxies are expected to contain at least one massive black hole, but how robust is this prediction? New research uses simulations to look at which galaxies tend to have more or fewer black holes, and with what properties. The post Anybody Home? Black Hole Occupation…
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Titania’s Deuterium Abundance and the Origin of Its Water
Stephen C. Tegler et al 2026 Planet. Sci. J. 7 191 Laboratory measurements of vacuum-prepared samples of water and semi-heavy water provided the missing optical constants needed to determine the deuterium abundance of Uranus’s moon Titania. The post Titania’s Deuterium Abundance…
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It’s a Beautiful Day in the (Solar) Neighborhood
Get to know your neighbors with a new database of nearby star clusters, stellar associations, and substellar objects. The post It’s a Beautiful Day in the (Solar) Neighborhood appeared first on AAS Nova .
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Four Cold Giant Planets Discovered by High-Cadence Microlensing Surveys
Cheongho Han et al 2026 AJ 172 110 Four giant planets with masses of 0.2–2.5 Jupiter masses, orbiting hosts of 7–60% the mass of the Sun, have been discovered using microlensing; all the planets appear to lie beyond the snow lines of their hosts. The post Four Cold Giant Planets…
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Megaparsec-Scale Neutral Hydrogen Flows in the Neighborhood of Hickson Compact Group 100
Qingzheng Yu et al 2026 ApJL 1007 L32 Using the Five-hundred-meter Aperture Spherical radio Telescope, astronomers have discovered an extended neutral hydrogen structure indicative of either tidal debris or accretion from the cosmic web. The post Megaparsec-Scale Neutral…
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Featured Image: Examining Galactic Filaments
The center of our galaxy is known to host hundreds of radio-emitting filaments, but the energy source for these features remains a mystery. New simulations attempt to shed light on what powers galactic non-thermal filaments. The post Featured Image: Examining Galactic Filaments…
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Tree-Ring Structure of Galactic Bar Resonance in N-Body Simulations
Rimpei Chiba et al 2026 ApJ 1006 132 Even in a noisy environment with fluctuations in pattern speed and encounters with the Sagittarius dwarf galaxy, a tree-ring structure arises in phase space measurements of the Milky Way’s galactic bar. The post Tree-Ring Structure of…
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Not All Black Holes Who Wander Are Lost
Astrobites reports on a new diagnostic tool used to understand how the neighborhood a black hole grows up in may affect the rest of its life. The post Not All Black Holes Who Wander Are Lost appeared first on AAS Nova .