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Observations of fan-spine topology by Solar Orbiter/EUI: Rotational motions and indications of Alfvén waves
Berghmans, D.; Parenti, S.; Valori, G. +3 more
Context. Torsional Alfvén waves do not produce any intensity variation and are therefore challenging to observe with imaging instruments. Previously, Alfvén wave observations were reported throughout all the layers of the solar atmosphere using spectral imaging.
Aims: We present a torsional Alfvén wave detected in an inverted Y-shaped structu…
JWST's First Glimpse of a z > 2 Forming Cluster Reveals a Top-heavy Stellar Mass Function
Daddi, Emanuele; Lu, Shiying; Kodama, Tadayuki +11 more
Clusters and their progenitors (protoclusters) at z ∼ 2 ‑ 4, the peak epoch of star formation, are ideal laboratories to study the formation process of both the clusters themselves and their member galaxies. However, a complete census of their member galaxies has been challenging due to observational difficulties. Here we present new JWST/NIRCam o…
Solar Eruptions in Nested Magnetic Flux Systems
Antiochos, Spiro K.; Kumar, Pankaj; DeVore, C. Richard +2 more
The magnetic topology of erupting regions on the Sun is a key factor in the energy buildup and release, and the subsequent evolution of flares and coronal mass ejections (CMEs). The presence/absence of null points and separatrices dictates whether and where current sheets form and magnetic reconnection occurs. Numerical simulations show that energ…
The JWST Early Release Science Program for Direct Observations of Exoplanetary Systems. IV. NIRISS Aperture Masking Interferometry Performance and Lessons Learned
Henning, Thomas; Fortney, Jonathan J.; Moran, Sarah E. +120 more
We present a performance analysis for the aperture masking interferometry (AMI) mode on board the James Webb Space Telescope Near Infrared Imager and Slitless Spectrograph (JWST/NIRISS). Thanks to self-calibrating observables, AMI accesses inner working angles down to and even within the classical diffraction limit. The scientific potential of thi…
Characterisation of the warm-Jupiter TOI-1130 system with CHEOPS and a photo-dynamical approach
Alonso, R.; Deleuil, M.; Erikson, A. +93 more
Context. Among the thousands of exoplanets discovered to date, approximately a few hundred gas giants on short-period orbits are classified as 'lonely' and only a few are in a multi-planet system with a smaller companion on a close orbit. The processes that formed multi-planet systems hosting gas giants on close orbits are poorly understood, and o…
A Photoionization Model for the Infrared Coronal Line Emission in the Classical Nova V1716 Scorpii
Evans, A.; Starrfield, S.; Page, K. L. +2 more
A near-infrared spectrum of nova V1716 Scorpii (PNV J17224490-4137160), a recent bright (
Generic low-atmosphere signatures of swirled-anemone jets
Nóbrega-Siverio, Daniel; Aulanier, Guillaume; Schmieder, Brigitte +4 more
Context. Solar jets are collimated plasma flows moving along magnetic field lines and are accelerated at low altitude following magnetic reconnection. Several of them originate from anemone-shaped low-lying arcades, and the most impulsive ones tend to be relatively wider and display untwisting motions.
Aims: We aim to establish typical behavi…
Are WASP-107-like Systems Consistent with High-eccentricity Migration?
Dai, Fei; Yu, Hang
WASP-107 b seems to be a poster child of the long-suspected high-eccentricity migration scenario. It is on a 5.7 day, polar orbit. The planet is Jupiter-like in radius but Neptune-like in mass with exceptionally low density. WASP-107 c is on a 1100 day, e = 0.28 orbit with at least Saturn mass. Planet b may still have a residual eccentricity of 0.…
The PHANGS-AstroSat Atlas of Nearby Star-forming Galaxies
Sandstrom, Karin M.; Kruijssen, J. M. Diederik; Leroy, Adam K. +29 more
We present the Physics at High Angular resolution in Nearby GalaxieS (PHANGS)-AstroSat atlas, which contains UV imaging of 31 nearby star-forming galaxies captured by the Ultraviolet Imaging Telescope on the AstroSat satellite. The atlas provides a homogeneous data set of far-UV and near-UV maps of galaxies within a distance of 22 Mpc and a median…
SDSS1335+0728: The awakening of a ∼106 M⊙ black hole
Bayo, A.; Bauer, F. E.; Merloni, A. +22 more
Context. The early-type galaxy SDSS J133519.91+072807.4 (hereafter SDSS1335+0728), which had exhibited no prior optical variations during the preceding two decades, began showing significant nuclear variability in the Zwicky Transient Facility (ZTF) alert stream from December 2019 (as ZTF19acnskyy). This variability behaviour, coupled with the hos…