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Novel bounds on decaying axionlike particle dark matter from the cosmic background
Horns, Dieter; Porras-Bedmar, Sara; Meyer, Manuel
The cosmic background (CB) is defined as the isotropic diffuse radiation field with extragalactic origin found across the electromagnetic spectrum. Different astrophysical sources dominate the CB emission at different energies, such as stars in the optical or active galactic nuclei in x rays. Assuming that dark matter consists of axions or axionli…
The carbon-rich type Ic supernova 2016adj in the iconic dust lane of Centaurus A: Potential signatures of an interaction with circumstellar hydrogen
Della Valle, M.; Gromadzki, M.; Galbany, L. +26 more
We present a comprehensive data set of supernova (SN) 2016adj located within the central dust lane of Centaurus A. SN 2016adj is significantly reddened and after correcting the peak apparent B-band magnitude (mB = 17.48 ± 0.05) for Milky Way reddening and our inferred host-galaxy reddening parameters (i.e., RVhost …
Transferring spectroscopic stellar labels to 217 million Gaia DR3 XP stars with SHBoost
Guiglion, G.; Valentini, M.; Jordi, C. +14 more
With Gaia Data Release 3 (DR3), new and improved astrometric, photometric, and spectroscopic measurements for 1.8 billion stars have become available. Alongside this wealth of new data, however, there are challenges in finding efficient and accurate computational methods for their analysis. In this paper, we explore the feasibility of using machin…
TOI-5344 b: A Saturn-like Planet Orbiting a Super-solar Metallicity M0 Dwarf
Kobulnicky, Henry A.; Cochran, William D.; Endl, Michael +19 more
We confirm the planetary nature of TOI-5344 b as a transiting giant exoplanet around an M0-dwarf star. TOI-5344 b was discovered with the Transiting Exoplanet Survey Satellite photometry and confirmed with ground-based photometry (the Red Buttes Observatory 0.6 m telescope), radial velocity (the Habitable-zone Planet Finder), and speckle imaging (…
Solar Flares and Magnetic Helicity
Toriumi, Shin; Park, Sung-Hong
Solar flares and coronal mass ejections are the largest energy-releasing phenomena in the current solar system. They cause drastic enhancements of electromagnetic waves of various wavelengths and sometimes eject coronal material into interplanetary space, disturbing the magnetic surroundings of orbiting planets, including the Earth. It is generall…
High contrast at short separation with VLTI/GRAVITY: Bringing Gaia companions to light
Lutz, D.; Genzel, R.; Sturm, E. +171 more
Context. Since 2019, GRAVITY has provided direct observations of giant planets and brown dwarfs at separations of down to 95 mas from the host star. Some of these observations have provided the first direct confirmation of companions previously detected by indirect techniques (astrometry and radial velocities). Aims. We want to improve the observi…
Resolving the Mechanical and Radiative Feedback in J1044+0353 with Keck Cosmic Web Imager Spectral Mapping
Martin, Crystal L.; Peng, Zixuan; Li, Yuan
We present integral field spectroscopy toward and around J1044+0353, a rapidly growing, low-metallicity galaxy that produces extreme [O III] line emission. A new map of the O32 flux ratio reveals a density-bounded ionization cone emerging from the starburst. The interaction of the hydrogen-ionizing radiation, produced by the very young starburst, …
Uncovering the first-infall history of the LMC through its dynamical impact in the Milky Way halo
Tian, Hao; Ting, Yuan-Sen; Chang, Jiang +2 more
The gravitational interactions between the LMC and the Milky Way cause dynamical perturbations in the MW halo, leading to biased distributions of stellar density and kinematics. We run 50 high-resolution N-body simulations exploring varying masses and halo shapes of the MW and LMC to study the evolution of LMC-induced perturbations. By measuring m…
A Multiwavelength, Multiepoch Monitoring Campaign of Accretion Variability in T Tauri Stars from the ODYSSEUS Survey. II. Photometric Light Curves
Kóspál, Ágnes; Calvet, Nuria; Espaillat, Catherine C. +8 more
Classical T Tauri stars (CTTSs) are young, low-mass stars that accrete material from their surrounding protoplanetary disk. To better understand accretion variability, we conducted a multiepoch, multiwavelength photometric monitoring campaign of four CTTSs, TW Hya, RU Lup, BP Tau, and GM Aur, in 2021 and 2022, contemporaneous with Hubble Space Tel…
The first analysis of three long-period low mass-ratio contact binaries
Wang, Xi; Guo, Ya-Ni; Li, Kai +9 more
The photometric and spectroscopic studies of three contact binaries, ASASSN-V J052036.28+144711.0, ASASSN-V J064846.22+241709.9, and ASASSN-V J073441.02+555833.0 were performed for the first time. The periods of all the three targets are longer than 0.5 d, and we discovered that their mass ratios are all smaller than 0.25. So, they are long-period…