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Integrated Geostationary Solar Energetic Particle Events Catalog: GSEP
Martens, Petrus C.; Georgoulis, Manolis K.; Aydin, Berkay +1 more
We present a catalog of solar energetic particle (SEP) events covering solar cycles 22, 23 and 24. We correlate and integrate three existing catalogs based on Geostationary Operational Environmental Satellite integral proton flux data. We visually verified and labeled each event in the catalog to provide a homogenized data set. We have identified …
Infrared spectra of complex organic molecules in astronomically relevant ice mixtures. V. Methyl cyanide (acetonitrile)
Rocha, W. R. M.; Rachid, M. G.; Linnartz, H.
Context. The increasing sensitivity and resolution of ground-based telescopes have enabled the detection of gas-phase complex organic molecules (COMs) across a variety of environments. Many of the detected species are expected to form on the icy surface of interstellar grains and transfer later into the gas phase. Therefore, icy material is regard…
Determining the Timescale over Which Stellar Feedback Drives Turbulence in the Interstellar Medium: A Study of Four Nearby Dwarf Irregular Galaxies
McQuinn, Kristen B. W.; Dolphin, Andrew E.; van Zee, Liese +2 more
Stellar feedback is fundamental to the modeling of galaxy evolution, as it drives turbulence and outflows in galaxies. Understanding the timescales involved are critical for constraining the impact of stellar feedback on the interstellar medium. We analyzed the resolved star formation histories along with the spatial distribution and kinematics of…
Dynamics of young stellar clusters as planet-forming environments
Parker, Richard J.; Reiter, Megan
Most stars and thus most planetary systems do not form in isolation. The larger star-forming environment affects protoplanetary disks in multiple ways: Gravitational interactions with other stars truncate disks and alter the architectures of exoplanet systems; external irradiation from nearby high-mass stars truncates disks and shortens their life…
A possible nearby microlensing stellar remnant hiding in Gaia DR3 astrometry
Rybicki, Krzysztof A.; Wyrzykowski, Łukasz; Kruszyńska, Katarzyna +3 more
Massive galactic lenses with large Einstein Radii should cause a measurable astrometric microlensing effect, that is, a light centroid shift due to the motion of the two images. Such a shift in the position of a background star due to microlensing was not included in the Gaia astrometric model, and therefore significant deviation should cause Gaia…
Testing a scaling relation between coherent radio emission and physical parameters of hot magnetic stars
Wade, Gregg A.; Chandra, Poonam; Das, Barnali +4 more
Coherent radio emission via electron cyclotron maser emission (ECME) from hot magnetic stars was discovered more than two decades ago, but the physical conditions that make the generation of ECME favourable remain uncertain. Only recently was an empirical relation, connecting ECME luminosity with the stellar magnetic field and temperature, propose…
TOI-2119: a transiting brown dwarf orbiting an active M-dwarf from NASA's TESS mission
Latham, David W.; Stassun, Keivan G.; Collins, Karen A. +27 more
We report the discovery of TOI-2119b, a transiting brown dwarf (BD) that orbits and is completely eclipsed by an active M-dwarf star. Using light-curve data from the Transiting Exoplanet Survey Satellite mission and follow-up high-resolution Doppler spectroscopic observations, we find the BD has a radius of Rb = 1.08 ± 0.03RJ…
HD 207897 b: A dense sub-Neptune transiting a nearby and bright K-type star
Bouchy, F.; Deleuil, M.; Moutou, C. +90 more
We present the discovery and characterization of a transiting sub-Neptune that orbits the nearby (28 pc) and bright (V = 8.37) K0V star HD 207897 (TOI-1611) with a 16.20-day period. This discovery is based on photometric measurements from the Transiting Exoplanet Survey Satellite mission and radial velocity (RV) observations from the SOPHIE, Autom…
Charting galactic accelerations - II. How to 'learn' accelerations in the solar neighbourhood
Evans, N. W.; Naik, A. P.; An, J. +1 more
Gravitational acceleration fields can be deduced from the collisionless Boltzmann equation, once the distribution function is known. This can be constructed via the method of normalizing flows from data sets of the positions and velocities of stars. Here, we consider application of this technique to the solar neighbourhood. We construct mock data …
The BepiColombo Environment Radiation Monitor, BERM
Vainio, Rami; Moissl, Richard; Oleynik, Philipp +9 more
The BepiColombo Environment Radiation Monitor (BERM) on board the European Space Agency's Mercury Planetary Orbiter (MPO), is designed to measure the radiation environment encountered by BepiColombo. The instrument measures electrons with energies from ∼150 keV to ∼10 MeV, protons with energies from ∼1.5 MeV to ∼100 MeV, and heavy ions with Linear…