Search Publications
Two Candidate KH 15D-like Systems from the Zwicky Transient Facility
Fang, Min; Zang, Weicheng; Dong, Subo +8 more
KH 15D contains a circumbinary disk that is tilted relative to the orbital plane of the central binary. The precession of the disk and the orbital motion of the binary together produce rich phenomena in the photometric light curve. In this work, we present the discovery and preliminary analysis of two objects that resemble the key features of KH 1…
The Rapidly Evolving Asymptotic Giant Branch Star, V Hya: ALMA Finds a Multiring Circus with High-velocity Outflows
Sahai, R.; Morris, M. R.; Lee, C. -F. +3 more
We have observed the mass-losing carbon star V Hya that is apparently transitioning from an asymptotic giant branch star to a bipolar planetary nebula, at an unprecedented angular resolution of ~0.″4-0.″6 with the Atacama Large Millimeter/submillimeter Array. Our 13CO and 12CO (J = 3-2 and J = 2-1) images have led to the disc…
ALMA Detections of [O III] and [C II] Emission Lines From A1689-zD1 at z = 7.13
Hashimoto, Tetsuya; Goto, Tomotsugu; Kim, Seong Jin +10 more
A1689-zD1 is one of the most distant galaxies, discovered with the aid of gravitational lensing, providing us with an important opportunity to study galaxy formation in the very early universe. In this study, we report the detection of [C II]158 µm and [O III]88 µm emission lines of A1689-zD1 in the Atacama Large Millimeter/submillimet…
Characterization of hot populations of Melotte 66 open cluster using Swift/UVOT
Subramaniam, Annapurni; Panthi, Anju; Vaidya, Kaushar +3 more
Ultraviolet (UV) wavelength observations have made a significant contribution to our understanding of hot stellar populations of star clusters. Multiwavelength spectral energy distributions (SEDs) of stars, including ultraviolet observations, have proven to be an excellent tool for discovering unresolved hot companions in exotic stars such as blue…
Phase spirals in cosmological simulations of Milky Way-sized galaxies
Antoja, T.; Ramos, P.; García-Conde, B. +2 more
We study the vertical perturbations in the galactic disc of the Milky Way-size high-resolution hydrodynamical cosmological simulation named GARROTXA. We detect phase spirals in the vertical projection Z - VZ of disc's stellar particles for the first time in this type of simulations. Qualitatively similar structures were detected in the …
The Rotation of Magnetic Flux Ropes Formed during Solar Eruption
Wang, Yuming; Liu, Rui; Jiang, Chaowei +3 more
Eruptions of solar filaments often show rotational motion about their rising direction, but the mechanism governing such rotation, and how the rotation is related to the initial morphology of the preeruptive filament (and cospatial sigmoid), filament chirality, and magnetic helicity, remains elusive. The conventional view of rotation as a result o…
Modeling the Transport of Relativistic Solar Protons along a Heliospheric Current Sheet during Historic GLE Events
Laitinen, Timo; Dalla, Silvia; Waterfall, Charlotte O. G. +2 more
There are many difficulties associated with forecasting high-energy solar particle events at Earth. One issue is understanding why some large solar eruptive events trigger ground-level enhancement (GLE) events and others do not. In this work we perform 3D test particle simulations of a set of historic GLEs to understand more about what causes thes…
PHANGS-JWST First Results: Spurring on Star Formation: JWST Reveals Localized Star Formation in a Spiral Arm Spur of NGC 628
Sandstrom, Karin M.; Henshaw, Jonathan D.; Kruijssen, J. M. Diederik +34 more
We combine JWST observations with Atacama Large Millimeter/submillimeter Array CO and Very Large Telescope MUSE Hα data to examine off-spiral arm star formation in the face-on, grand-design spiral galaxy NGC 628. We focus on the northern spiral arm, around a galactocentric radius of 3-4 kpc, and study two spurs. These form an interesting contrast,…
The detection of transiting exoplanets by Gaia
Gomel, Roy; Mazeh, Tsevi; Audard, Marc +14 more
Context. The space telescope Gaia is mainly dedicated to performing high-precision astrometry but is also used to perform spectroscopy and epoch photometry, which can be used to study various types of photometric variability. One such variability type is exoplanetary transits. The photometric data accumulated so far have finally matured enough to …
A Solar-cycle Study of Coronal Rotation: Large Variations, Rapid Changes, and Implications for Solar-wind Models
Morgan, Huw; Williams, Thomas; Kuridze, David +1 more
Information on the rotation rate of the corona, and its variation over latitude and solar cycle, is valuable for making global connections between the corona and the Sun, for global estimates of reconnection rates and as a basic parameter for solar-wind modeling. Here, we use a time series of tomographical maps gained from coronagraph observations…