Search Publications
Survey of Magnetic Field Parameters Associated with Large Solar Flares
Hou, Yijun; Li, Ting; Chen, Anqin +4 more
Until now, how the magnetic fields in M/X-class flaring active regions (ARs) differ from C-class flaring ARs remains unclear. Here, we calculate the key magnetic field parameters within the area of high photospheric free energy density (HED region) for 323 ARs (217 C- and 106 M/X-flaring ARs), including total photospheric free magnetic energy dens…
JWST Ice Band Profiles Reveal Mixed Ice Compositions in the HH 48 NE Disk
McGuire, Brett A.; van Dishoeck, E. F.; Bergner, Jennifer B. +19 more
Planet formation is strongly influenced by the composition and distribution of volatiles within protoplanetary disks. With JWST, it is now possible to obtain direct observational constraints on disk ices, as recently demonstrated by the detection of ice absorption features toward the edge-on HH 48 NE disk as part of the Ice Age Early Release Scien…
Magnetic Field of Molecular Gas Measured with the Velocity Gradient Technique. II. Curved Magnetic Field in kpc-scale Bubble of NGC 628
Li, Dalei; Tang, Xindi; Zhou, Jianjun +9 more
We report the detection of the ordered alignment between the magnetic field and kpc-scale bubbles in the nearby spiral galaxy, NGC 628. Applying the Velocity Gradient Technique on CO spectroscopic data from the ALMA-PHANGS, the magnetic field of NGC 628 is measured at the scale of 191 pc (∼4″). The large-scale magnetic field is oriented parallel t…
Near Subsonic Solar Wind Outflow from an Active Region
Riley, Pete; Bale, Stuart D.; Sioulas, Nikos +10 more
During Parker Solar Probe (Parker) Encounter 15 (E15), we observe an 18 hr period of near-subsonic (M S ∼ 1) and sub-Alfvénic (SA), M A ⋘ 1, slow-speed solar wind from 22 to 15.6 R ⊙. As the most extreme SA interval measured to date and skirting the solar wind sonic point, it is the deepest Parker has probed into t…
Slow Rotation for the Super-puff Planet Kepler-51d
Winn, Joshua N.; Lammers, Caleb
Super-puffs are low-density planets of unknown origin and composition. If they form by accreting nebular gas through a circumplanetary disk, one might expect super-puffs to be spinning quickly. Here, we derive upper limits on the rotational oblateness of the super-puff Kepler-51d, based on precise transit observations with the NIRSpec instrument o…
Radial Wave in the Galactic Disk: New Clues to Discriminate Different Perturbations
Antoja, Teresa; Schönrich, Ralph; Li, Zhao-Yu +1 more
Decoding the key dynamical processes that shape the Galactic disk structure is crucial for reconstructing the Milky Way's evolution history. The second Gaia data release unveils a novel wave pattern in the L Z ‑<V R > space, but its formation mechanism remains elusive due to the intricate nature of involved perturbati…
The Orbit and Companion of PSR J1622-0315: Variable Asymmetry and a Massive Neutron Star
Kennedy, Mark R.; Turchetta, Marco; Sen, Bidisha +6 more
The companion to PSR J1622-0315, one of the most compact known redback millisecond pulsars, shows extremely low irradiation despite its short orbital period. We model this system to determine the binary parameters, combining optical observations from the New Technology Telescope in 2017 and the Nordic Optical Telescope in 2022 with the binary mode…
Assessing the Performance of the ADAPT and AFT Flux Transport Models Using In Situ Measurements from Multiple Satellites
Warren, Harry P.; Linton, Mark G.; Ugarte-Urra, Ignacio +7 more
The launches of Parker Solar Probe (Parker) and Solar Orbiter (SolO) are enabling a new era of solar wind studies that track the solar wind from its origin at the photosphere, through the corona, to multiple vantage points in the inner heliosphere. A key ingredient for these models is the input photospheric magnetic field map that provides the bou…
VaDAR: Varstrometry for Dual AGN Using Radio Interferometry
Nyland, Kristina; Clarke, Tracy E.; Satyapal, Shobita +5 more
Binary and dual active galactic nuclei (AGNs) are an important observational tool for studying the formation and dynamical evolution of galaxies and supermassive black holes. An entirely new method for identifying possible AGN pairs makes use of the exquisite positional accuracy of Gaia to detect astrometrically variable quasars, in tandem with th…
Star Formation in the H II Region Sh2-87: Evidence of Global Hierarchical Collapse
Baug, Tapas; Biswas, Siddhartha; Mondal, Soumen +3 more
We present a detailed study of the Sh2-87 H II region using a multiwavelength data set in optical to radio bands. A Herschel column density map revealed that the host cloud is filamentary in nature, and together they formed a central dense hub. The extinction map generated using near-infrared photometric data also signifies the nonuniform distribu…