Jamie Dietrich et al 2026 AJ 172 35
Some systems in the Habitable Worlds Observatory (HWO) Exoplanet Exploration Program (ExEP) Mission Star List have more than a 50% chance of hosting a temperate terrestrial exoplanet.
The post Predictive Rankings of the Probability of Hosting a Temperate Terrestrial World for the HWO ExEP Mission Star List appeared first on AAS Nova.
Junwei Zhao et al 2026 ApJ 1004 175
More than half of solar magnetic flux appears to emerge in three bands, two of which rotate faster than the Carrington rate; this finding suggests a connection between surface flux and interior dynamical processes.
The post Long-Term Clustering Pattern of Solar Active Regions and Their Potential Connection with Magneto-Rossby Waves appeared first on AAS Nova.
Zhecheng Hu et al 2026 ApJS 284 70
Researchers have identified six new candidate circumbinary disk systems, potentially greatly increasing the number of known systems of this type; these system exhibit deep and prolonged dimming episodes.
The post Six New Circumbinary Disk Occultation Candidates from the Zwicky Transient Facility appeared first on AAS Nova.
Yapeng Zhang et al 2026 ApJL 1005 L29
Ultra-hot Jupiter KELT-9b possesses an outflow with a mass-loss rate above 1013 g s-1 — one of the highest mass-loss rates measured for a gaseous exoplanet — and a diagnostic hydrogen Balmer line from its dayside.
The post Hydrogen Airglow from an Escaping Ultrahot Jupiter Atmosphere appeared first on AAS Nova.
Asad Ukani et al 2026 ApJ 1004 171
Modeling of the Milky Way’s circumnuclear disk of molecular gas suggests that the gas is distributed in a disk with inner and outer radii of 1.0 and 2.9 parsecs and an inclination of 60 degrees.
The post Modeling the Milky Way Circumnuclear Disk: Rosettes and Rings appeared first on AAS Nova.
Michelle L. Hill et al 2026 Planet. Sci. J. 7 140
Planets with radii 20% or possibly 30% smaller than Earth’s radius can maintain atmospheres, with initial carbon content, core radius fraction, initial mantle temperature, and other factors playing a role.
The post Smaller Than Earth Habitability Model (STEHM): The Lower Size Limit for Atmosphere Retention in the Habitable Zone appeared first on AAS Nova.
Aneesh Baburaj et al 2026 AJ 172 28
New observations of the coldest directly imaged planetary-mass companion of the pre-JWST era show a potential planetary formation pathway for the 25.2-Jupiter-mass object.
The post JWST-TST High Contrast: First Direct Spectroscopy of GJ 504 b Reveals Clouds and Possible Metal Enrichment appeared first on AAS Nova.
Itai Sfaradi et al 2026 ApJL 1005 L19
Recent radio rebrightening of a supernova observed in 2012 suggests that either the progenitor star experienced a past change in mass-loss rate or wind speed, or there is an off-axis relativistic jet present.
The post A 14-Yr-Old Mystery: The Peculiar Case of the Engine-Driven SN 2012ap appeared first on AAS Nova.
Ádám Mátéfy et al 2026 ApJ 1004 142
Gaia21bja is a young stellar object that brightens by up to 1.7 magnitudes during its outbursts, with its luminosity and mass-accretion rate increasing by a factor of 5.5–6 during the bursts.
The post Gaia21bja: Pre-Main-Sequence Star with Quasiperiodic Bursts appeared first on AAS Nova.
Yunshi Zeng et al 2026 ApJS 284 63
Using more than 50,000 images of coronal mass ejections, researchers have developed a novel machine-learning classification framework applicable to coronal mass ejections.
The post Automatic Detection and Segmentation of Coronal Mass Ejections in LASCO C3 Images appeared first on AAS Nova.
Sandeep Kumar et al 2026 ApJ 1006 26
By combining ground-based and space-based solar observations, researchers found that solar minimum solar wind predictions require higher source-surface heights than solar maximum predictions.
The post Source Surface Height Optimization for Improved Solar Wind Velocity Forecasting Across Solar Cycles 23, 24, and 25 appeared first on AAS Nova.
Yejing Zhan et al 2026 ApJL 1004 L46
The combination of gravitational wave emission, magnetic dissipation, and tidal interactions should cause the beat clock period of the CHIME/ILT J1634+44 system to change by tens of seconds per year.
The post A Falsifiable Timing Test for the Double-White-Dwarf Model of Long-Period Transients appeared first on AAS Nova.
The Hayabusa2 spacecraft could be rerouted to collide with asteroid 2024 YR4 and impart a velocity change of a few centimeters per second (though thankfully, such an intervention is not necessary!).
The post Feasibility Analysis of a Hypothetical Kinetic-Impact Deflection of 2024 YR4 Using In-Space Hayabusa2 for Earth-Impact Risk Reduction appeared first on AAS Nova.
New millimeter-wavelength observations reveal four new outflow lobes in addition to a previously known central bipolar jet; the new lobes have chains of knots, which are a sign of episodic ejection.
The post ALMA-QUARKS View of W49N: Multipolar Episodic Outflow Associated with the Most Energetic Galactic Water Maser appeared first on AAS Nova.
New constraints on the mass of V1674 Herculis from X-ray observations place the white dwarf around 1.09 solar masses, well below the near-Chandrasekhar mass proposed in previous works.
The post X-Ray Spectroscopy Mass Constraints on V1674 Her: The Fastest Nova Does Not have a Near-Chandrasekhar White Dwarf appeared first on AAS Nova.
Resonance between gravitational waves and magnetic fields may produce a faint radio signal in pulsar magnetospheres; current searches are approaching the sensitivity necessary to detect this signal.
The post High-Sensitivity Methodologies to Detect Radio-Band Gravitational Waves appeared first on AAS Nova.
In a cosmology framework that proposes the universe began with a period of contraction before the Big Bang, researchers find that high-frequency gravitational waves oscillate in a way that is potentially detectable.
The post Smoking-Gun Signatures of Bounce Cosmology from Echoes of Relic Gravitational Waves appeared first on AAS Nova.
Polarization measurements show evidence of shock compression and possible interaction between a supernova remnant and previously formed circumstellar shells from the progenitor’s mass loss.
The post The Cocoon from a Massive Star’s Death: VLA Radio Polarization Study of Possible Historical Supernova Remnant G7.7–3.7 appeared first on AAS Nova.
The presence of a 34-solar-mass brown dwarf companion to an ultra-hot Jupiter suggests that the hot Jupiter must have formed within 1.5 au of its host star to remain dynamically stable.
The post A Massive Hot-Jupiter Companion that Disfavors Giant Planet Formation beyond the Water-Ice Line appeared first on AAS Nova.
Using gravitational flow simulations, researchers link smooth areas on the face of a comet to a single event 600–1,200 years ago, possibly connected to multiple close encounters with Jupiter.
The post The Large Smooth Patch on Comet 9P/Tempel 1: Remnant of a Recent Past Event appeared first on AAS Nova.
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