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 Discovered by High-Cadence Microlensing Surveys appeared first on AAS Nova.

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 Hydrogen Flows in the Neighborhood of Hickson Compact Group 100 appeared first on AAS Nova.

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 Galactic Bar Resonance in N-Body Simulations appeared first on AAS Nova.

Stefan J. Hofmeister et al 2026 ApJS 286 3

Researchers have assessed the diffusion and scattering within an ultraviolet instrument on board Solar Orbiter, which takes detailed observations of our home star from as close as about 60 au.

The post A Point-Spread Function for the Extreme Ultraviolet High-Resolution Imager on Board Solar Orbiter appeared first on AAS Nova.

Claire S. Ye and Raymond G. Carlberg 2026 ApJL 1007 L25

Pairing cold dark matter simulations with observations of stellar streams and globular clusters, researchers have extracted a declining power-law-like globular cluster initial mass function.

The post Inferring Globular Cluster Initial Mass Function from Stellar Streams appeared first on AAS Nova.

Hiromichi Tagawa et al 2026 ApJ 1006 121

Emission arising from the merger of stellar-mass black holes in an active galactic nucleus disk should be identifiable through monitoring of order 1,000 active galactic nuclei of sufficient luminosity for a year.

The post Electromagnetic Flares from Compact-Object Mergers in Active Galactic Nucleus Disks: Signatures and Predictions appeared first on AAS Nova.

P. Wang et al 2026 AJ 172 102

After identifying a new globular cluster, HSC 61, belonging to the Sagittarius dwarf galaxy, researchers have mapped the stellar stream, determined its metallicity, and analyzed the Sagittarius merger event.

The post The Properties of Globular Clusters and Elqui Associated with the Sagittarius Dwarf Galaxy appeared first on AAS Nova.

Mallory J. Kinczyk et al 2026 Planet. Sci. J. 7 182

The Gelato mission would collect a sample from the surface of the comet 67P/Churyumov–Gerasimenko, gathering material that, unlike coma materials collected in previous missions, is relatively unprocessed.

The post Gelato: A Mission Concept for Comet Surface Sample Return appeared first on AAS Nova.

M. Sten Delos et al 2026 ApJ 1006 125

The kinematics of small Milky Way satellites should differ depending on whether dark matter is warm or cold; current data constrain the mass of warm dark matter particles to >5.8 keV at 95% confidence.

The post Testing Warm Dark Matter with Kinematics of the Smallest Galaxies appeared first on AAS Nova.

Gokul P. Srinivasaragavan et al 2026 ApJL 1006 L36

Through modeling, researchers determined that a recently discovered supernova accompanied by an X-ray flash likely gave rise to a long-lived magnetar that may be surrounded by an accretion disk.

The post EP250827b/SN 2025wkm: An X-Ray Flash-Supernova Powered by a Central Engine and Circumstellar Interaction appeared first on AAS Nova.

Arun Seshadri et al 2026 AJ 172 98

The molecular cloud complex G12.79+0.43 contains 82 young stellar object candidates; while this complex is spatially associated with a larger superbubble, it’s not yet clear if there is a causal association.

The post Star Formation at the Periphery of a Molecular Superbubble: The Case of G12.79+0.43 appeared first on AAS Nova.

Junyi Zhang et al 2026 ApJ 1004 66

Eruptions taking place in different locations on the Sun (e.g., on the solar limb versus on the disk) appear to have different spectral characteristics, paving a way for source regions of stellar flares to be studied.

The post Can We Distinguish the Source Region Location of Filament/Prominence Eruptions from the Sun-as-a-Star Hα Spectrum? appeared first on AAS Nova.

S. Corley et al 2026 ApJS 285 60

The upcoming Wide Fast Deep and Deep Drilling Field surveys have limited potential to confirm exoplanets, with just a handful of hot planets around M-dwarf stars likely to be confirmed in the Deep Drilling Field.

The post Predictions of Transiting Exoplanet Confirmations from Rubin LSST Surveys appeared first on AAS Nova.

Mengting Ju et al 2026 ApJL 1002 L18

Using data taken with a novel slit-stepping observing mode, researchers have found an anticorrelation between radial metallicity gradients and radial mixing time for galaxies at z ~ 1.

The post MSA-3D: Connecting the Chemical and Kinematic Structures of Galaxies at z ∼ 1 appeared first on AAS Nova.

Ky Huynh et al 2026 Planet. Sci. J. 7 179

Each of the studied outbursts released roughly one hundred thousand to one million kilograms of material — similar to outbursts from other comets — and caused brightening episodes of –0.2 to –1.1 magnitudes.

The post A Look at Eight Outbursts of Comet 7P/Pons–Winnecke appeared first on AAS Nova.

Ting Li et al 2026 ApJ 1006 47

Using high-cadence ultraviolet observations of solar flares over the course of 12 years, researchers have carried out a statistical survey that revealed rapid pulsation of small-scale flare structures.

The post Unprecedented Fast Winking of Solar Flares Triggered by Bursty Magnetic Reconnection appeared first on AAS Nova.

Sanjaya Paudel et al 2026 ApJL 1006 L18

Dwarf elliptical galaxies in the Virgo Cluster appear to come in “flat” and “round” varieties; the dynamics of these populations suggest that flat dwarf ellipticals have experienced less tidal processing.

The post Tidal Grinding of Dwarf Galaxies in Cluster Environments appeared first on AAS Nova.

L. C. Mayorga et al 2026 AJ 172 87

Analysis of Cassini spectra of Titan suggests that JWST is unlikely to identify atmospheric components aside from methane on a Titan-like exoplanet; optical and near-ultraviolet observations will be key.

The post Piercing Through the Haze: Characterizing Titan-Like Terrestrial Exoplanets with JWST appeared first on AAS Nova.

Zihao Wu et al 2026 ApJ 1006 18

A concentration of galaxies four times denser than expected provides an opportunity to understand how environment impacts galaxy evolution and the onset of reionization.

The post JADES: A Prominent Galaxy Overdensity Candidate Within the First 500 Myr appeared first on AAS Nova.

Mengjie Li et al 2026 ApJS 285 26

Using light curves from the Transiting Exoplanet Survey Satellite (TESS), researchers have performed an asteroseismic analysis of 221 main-sequence and subgiant solar-like oscillators.

The post Solar-Like Oscillations of Main-Sequence and Subgiant Stars in the TESS Field appeared first on AAS Nova.