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The host of GRB 171205A in 3D: A resolved multiwavelength study of a rare grand-design spiral GRB host
Covino, S.; D'Elia, V.; Hartmann, D. H. +17 more
Long GRB hosts at z < 1 are usually low-mass, low-metallicity star-forming galaxies. Here we present the most detailed, spatially resolved study of the host of GRB 171205A so far, a grand-design barred spiral galaxy at z = 0.036. Our analysis includes MUSE integral field spectroscopy complemented with high-spatial-resolution UV/VIS HST imaging …
A Multiwavelength, Multiepoch Monitoring Campaign of Accretion Variability in T Tauri Stars from the ODYSSEUS Survey. III. Optical Spectra
Ábrahám, Péter; Kóspál, Ágnes; Fiorellino, Eleonora +20 more
Classical T Tauri Stars (CTTSs) are highly variable stars that possess gas- and dust-rich disks from which planets form. Much of their variability is driven by mass accretion from the surrounding disk, a process that is still not entirely understood. A multiepoch optical spectral monitoring campaign of four CTTSs (TW Hya, RU Lup, BP Tau, and GM Au…
The toroidal curvatures of interplanetary coronal mass ejection flux ropes from multi-point observations
Luhmann, J. G.; Lai, H. R.; Russell, C. T. +5 more
Interplanetary coronal mass ejections (ICMEs), characterized by their magnetic flux ropes, could potentially trigger geomagnetic disturbances. They have been attracting extensive investigations for decades. Despite numerous ICME models proposed in the past, few account for the curvature of the flux rope axis. In this study, we use conjunction obse…
Ephemeris Matching Reveals False Positive Validated and Candidate Planets from the K2 Mission
Vanderburg, Andrew; Lehmann, Drake A.
Data from the Kepler space telescope have led to the discovery of thousands of planet candidates. Most of these candidates are likely to be real exoplanets, but a significant number of false positives still contaminate the sample, especially in candidate lists from the K2 mission. Identifying and rejecting the false positives lurking in the planet…
Speckle Interferometry at SOAR Telescope in 2023
Tokovinin, Andrei; Mason, Brian D.; Mendez, Rene A. +1 more
Results of the speckle-interferometry observations at the 4.1 m Southern Astrophysical Research Telescope obtained during 2023 are presented: 1913 measurements of 1533 resolved pairs or subsystems (median separation 0.″16) and nonresolutions of 552 targets; 42 pairs are resolved here for the first time. This work continues our long-term effort to …
JWST/MIRI Detection of [Ne V], [Ne VI], and [O IV] Wind Emission in the O9 V Star 10 Lacertae
Kumari, Nimisha; Gordon, Karl D.; Law, David R. +5 more
We report the detection of broad, flat-topped emission in the fine-structure lines of [Ne V], [Ne VI], and [O IV] in mid-infrared spectra of the O9 V star 10 Lacertae obtained with James Webb Space Telescope/Mid-Infrared Instrument. Optically thin emission in these high ions traces a hot, low-density component of the wind. The observed line fluxes…
The Gaia RVS benchmark stars. II. A sample of stars selected for their Gaia high radial velocity
Ludwig, H. -G.; Bonifacio, P.; Caffau, E. +16 more
Context. The Gaia satellite has already provided the astronomical community with three data releases, and the Radial Velocity Spectrometer (RVS) on board Gaia has provided the radial velocity for 33 million stars.
Aims: When deriving the radial velocity from the RVS spectra, several stars are measured to have large values. To verify the credi…
TYC 3340-2437-1: A Quadruple System with a Massive Star
Fang, Min; Jin, Chichuan; Liu, Chao +11 more
Hierarchical massive quadruple systems are ideal laboratories for examining the theories of star formation, dynamical evolution, and stellar evolution. The successive mergers of hierarchical quadruple systems might explain the mass gap between neutron stars and black holes. Looking for light curves of O-type binaries identified by LAMOST, we find …
On the Fate of Slow Boulders Ejected after DART Impact on Dimorphos
Moreno, Fernando; Campo Bagatin, Adriano; Tancredi, Gonzalo
On 2022 September 26 23:14 UT, the NASA Double Asteroid Redirection Test spacecraft successfully impacted Dimorphos, the secondary component of the binary (65803) Didymos system, demonstrating asteroid orbit deflection for the first time. A large amount of debris, consisting of a wide size–frequency distribution of particulates (from micron-sized …
An Absolute Mass, Precise Age, and Hints of Planetary Winds for WASP-121A and b from a JWST NIRSpec Phase Curve
Sing, David K.; Lothringer, Joshua D.; Rustamkulov, Zafar +3 more
We have conducted a planetary radial velocity measurement of the ultrahot Jupiter WASP-121b using JWST NIRSpec phase curve data. Our analysis reveals the Doppler shift of the planetary spectral lines across the full orbit, which shifts considerably across the detector (∼10 pixels). Using cross-correlation techniques, we have determined an overall …