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19912026
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621 papers · 1 filter

astro-ph.SR2026

SPIRITS 19q: Dust Production by a Subsolar-metallicity Carbon-rich Wolf-Rayet Star in NGC 2403

Sam Rose, Ryan M. Lau, Jacob E. Jencson +20

We present JWST/NIRSpec IFU observations of SPIRITS 19q, the highly dust-producing carbon-rich (WC) binary candidate located in a subsolar-metallicity region of the nearby spiral g…

astro-ph.SR2026

Euclid: The convective-transition gap of 47 Tuc

M. Libralato, M. Griggio, R. Gerasimov +140

We report the first detection of the `convective-transition gap' (also known as `M-dwarf gap') in the globular cluster 47 Tuc (NGC 104) thanks to Euclid data. This feature, linked…

astro-ph.SR2026★ 1 cited

Current Unsolved Problems in Planetary Nebulae Research

Sun Kwok, Bruce Balick, You-Hua Chu +5

While there has been significant progress in our understanding of the origin and evolu-tion of planetary nebulae in the last 50 years, there remain several unsolved problems. These…

astro-ph.SR2026

Observations of highly inclined disks with ALMA. Results from 12CO gas and continuum observations

Laurine Martinien, Gaspard Duchêne, Álvaro Ribas +4

[Abridged] We aim to study the radial and vertical extents of 12CO gas, millimeter dust thermal emission and optical/NIR scattered light by dust in disks. We analyze a sample of 14…

astro-ph.SR2026

The dusty envelopes of asymptotic giant branch stars with ultraviolet excesses

Jaime Alonso-Hernández, Carmen Sánchez Contreras, Raghvendra Sahai +1

Aims. In a first study, we characterised the properties of the gas component in the circumstellar envelopes surrounding a sample of 29 AGB stars with UV excesses. Now we intend to…

astro-ph.SR2026

Parker Solar Probe observations of solar energetic particle (SEP) events with inverse velocity arrival (IVA) features

Zigong Xu, C. M. S. Cohen, R. A. Leske +21

In SEP events, velocity dispersion (VD) is characterized by the earlier arrival of faster, higher-energy particles relative to slower ones, assuming negligible acceleration time an…

astro-ph.SR2026

Estimating Electron Densities in the Middle Solar Corona using White-light and Radio Observations

Surajit Mondal, Shaheda Begum Shaik, Russell A. Howard +45

The electron density of the solar corona is a fundamental parameter in many areas of solar physics. Traditionally, routine estimates of coronal density have relied exclusively on w…

astro-ph.SR2025★ 1 cited

Variation of the disk thickness across ice bands: A method to determine ice abundances in highly inclined protoplanetary disks

Laurine Martinien, Gaspard Duchêne, François Ménard +6

The James Webb Space Telescope provides unprecedented information to study ices in protoplanetary disks. However, the saturation of ice bands in highly inclined disks hinders the m…

astro-ph.SR2025★ 5 cited

Evidence for the Keplerian orbit of a close companion around a giant star

Mats Esseldeurs, Leen Decin, Joris De Ridder +31

Close companions influence stellar evolution through tidal interactions, mass transfer, and mass loss effects. While such companions are detected around young stellar objects, main…

astro-ph.SR2025

The EBLM Project XVIII. 3D Obliquities of Five Low-Mass Eclipsing Binaries

Becca Spejcher, David V. Martin, Jake Pandina +17

The formation of tight stellar binaries remains an unsolved problem. There is too much angular momentum in a collapsing and fragmenting protostellar cloud to form a stellar binary…

astro-ph.SR2025★ 1 cited

The nature of ASASSN-24fw's occultation: modelling the event as dimming by optically thick rings around a sub-stellar companion

Sarang Shah, Jonathan P. Marshall, Carlos del Burgo +12

ASASSN-24fw is a main-sequence F-type star that experienced a rapid and long-lasting dimming event beginning in late 2024 and continuing until mid 2025. Its pre-dimming spectral en…

astro-ph.SR2025

Possible First Detection of Gyroresonance Emission from a Coronal Mass Ejection in the Middle Corona

Surajit Mondal, Bin Chen, Xingyao Chen +45

Routine measurements of the magnetic field of coronal mass ejections (CMEs) have been a key challenge in solar physics. Making such measurements is important both from a space weat…

astro-ph.SR2025★ 8 cited

HWO Target Stars and Systems: A Prioritized Community List of Potential Stellar Targets for the Habitable Worlds Observatory's ExoEarth Survey

Noah W. Tuchow, Caleb K. Harada, Eric E. Mamajek +9

The HWO Target Stars and Systems 2025 (TSS25) list is a community-developed catalog of potential stellar targets for the Habitable Worlds Observatory (HWO) in its survey to directl…

astro-ph.SR2025★ 3 cited

JWST observations of the Ring Nebula (NGC 6720) -- II. PAH emission

Nicholas Clark, Els Peeters, Nick L. J. Cox +16

Polycyclic aromatic hydrocarbons (PAHs) and carbonaceous dust have been observed in clumpy circumstellar environments, yet their formation and evolutionary pathways in such environ…

astro-ph.SR2025★ 2 cited

Do accretion-powered stellar winds help spin down T Tauri stars?

Lukas Gehrig, Eric Gaidos, Laura Venuti +2

How T Tauri stars remain slowly rotating while still accreting material is a long-standing puzzle. Current models suggest that these stars may lose angular momentum through magneto…

astro-ph.SR2025★ 1 cited

Exploring circumstellar chemistry in X-ray emitting AGB stars

J. Alonso-Hernández, C. Sánchez Contreras, M. Agúndez +5

Aims. Our goal is to characterize the chemistry and physical conditions of the circumstellar envelopes (CSEs) of Asymptotic Giant Branch (AGB) binary candidate stars with UV-excess…

astro-ph.SR2025★ 7 cited

ATOMIUM: Continuum emission and evidence of dust enhancement from binary motion

T. Danilovich, N. Samaratunge, Y. Mori +35

Low- and intermediate-mass stars on the asymptotic giant branch (AGB) account for a significant portion of the dust and chemical enrichment in their host galaxy. Here we present AL…

astro-ph.SR2025

Euclid: Quick Data Release (Q1) -- Ultracool dwarfs in the Euclid Deep Fields

A. Mohandasan, R. L. Smart, C. Reylé +180

Ultracool dwarfs (UCDs) encompass the lowest-mass stars and brown dwarfs at the substellar boundary. These intrinsically faint objects are challenging to detect, but the wide cover…

astro-ph.SR2025★ 1 cited

Euclid: Quick Data Release (Q1) -- A photometric search for ultracool dwarfs in the Euclid Deep Fields

M. Žerjal, C. Dominguez-Tagle, N. Vitas +178

We present a catalogue of 5306 new ultracool dwarf (UCD) candidates in the three Euclid Deep Fields in the Q1 data release. They range from late M to late T dwarfs, and include 120…

astro-ph.SR2025

JWST 1.5 μm and 4.8 μm Photometry of Y Dwarfs

Loïc Albert, Sandy K. Leggett, Per Calissendorff +20

Brown dwarfs lack nuclear fusion and cool with time; the coldest known have an effective temperature below 500 K, and are known as Y dwarfs. We present a James Webb Space Telescope…

astro-ph.SR2025

The Structure of the Molecular Envelope of the Ring Nebula (NGC 6720)

Joel H. Kastner, David Wilner, Diana Ryder +5

We present the first interferometric imaging of molecular line emission from the Ring Nebula, NGC~6720, in the form of Submillimeter Array (SMA) observations of CO $J=2\rightarrow…

astro-ph.SR2025★ 2 cited

ALMA observations of CO isotopologues towards six obscured post-AGB stars

T. Khouri, D. Tafoya, W. H. T. Vlemmings +13

Low- and intermediate-mass stars evolve through the asymptotic giant branch (AGB), when an efficient mass-loss process removes a significant fraction of their initial mass. A subst…

astro-ph.SR2024★ 1 cited

Temporal Changes in the Infrared Spectra of Magellanic Carbon Stars

G. C. Sloan, K. E. Kraemer, B. Aringer +9

The Medium-Resolution Spectrometer on the Mid-Infrared Instrument on JWST obtained spectra of three carbon stars in the Large Magellanic Cloud. Two of the spectra differ significan…

astro-ph.SR2024★ 6 cited

The grazing angle icy protoplanetary disk PDS 453

Laurine Martinien, François Ménard, Gaspard Duchêne +12

PDS 453 is a rare highly inclined disk where the stellar photosphere is seen at grazing incidence on the disk surface. Our goal is take advantage of this geometry to constrain the…