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Revisiting the multi-planetary system of the nearby star HD 20794: Confirmation of a low-mass planet in the habitable zone of a nearby G-dwarf
Bouchy, F.; Rebolo, R.; Quanz, S. P. +44 more
Context. Close-by Earth analogs and super-Earths are of primary importance because they will be preferential targets for the next generation of direct imaging instruments. Bright and close-by G-to-M type stars are preferential targets in radial velocity surveys to find Earth analogs. Their brightness allows us to achieve the best precision on RV m…
Can Well-sampled Phase Curves Be Used to Infer Asteroid Spectral Features?
Murray, Zachary
The relationship of an asteroid's reduced magnitude to its phase has a long history of study. Included in this history have been efforts to study the correlation between these parameters and spectral type. However, these efforts often suffer from the inclusion of only a few asteroids, missing phase curve data, uncorrected rotational or apparitiona…
The role of the hot porous layer in the gas flow in the inner coma
Küppers, M.; Thomas, N.; Rezac, L. +5 more
Aims. The objective of this work is to study the influence of a highly non-isothermal porous dust layer on the formation of a comet's inner coma. We studied the water gas activity of comet 67P/Churyumov-Gerasimenko to find a link between the gas properties around the comet and the properties of the dust surface crust. The effects on the radiative …
What Does the LMC Look Like? It Depends on [M/H] and Age
Rix, Hans-Walter; Andrae, Rene; Chandra, Vedant +2 more
We offer a new way to look at the LMC through stellar mono-abundance and mono-age mono-abundance maps. These maps are based on ≳500,000 member stars with estimates of [M/H] (σ[M/H] ~ 0.17) and age
Magnetically controlled ionosphere of Mars: A model analysis with the vertical plasma drift effects
Haider, S. A.; Bougher, S. W.; Withers, P. +2 more
We use our 1-D chemical diffusive model to quantify the physical processes necessary to interpret the dayside ionospheric electron density profiles measured with the Mars Radio Science (MaRS) experiment onboard the Mars Express (MEX) and Radio Occultation Science Experiment (ROSE) onboard the Mars Atmosphere and Volatile Evolution (MAVEN) spacecra…
ASKAP Observations of the Radio Shell in the Composite Supernova Remnant G310.6-1.6
Hopkins, Andrew M.; Kothes, Roland; Lazarević, Sanja +12 more
We report the observations of the radio shell of the supernova remnant (SNR) G310.6–1.6 at 943 MHz from the Evolutionary Map of the Universe (EMU) and the Polarization Sky Survey of the Universe's Magnetism (POSSUM) surveys by using the Australian Square Kilometre Array Pathfinder (ASKAP). We detect polarized emission from the central pulsar wind …
Spectral Structures of Jovian Broadband Kilometric Radiation Revealed by Cassini and Juno
Kurth, W. S.; Píša, D.; Fischer, G. +2 more
Cassini flew past Jupiter in 2000/2001, and Juno has been orbiting the gas giant since mid-2016. Here we focus on the spectral properties of Jovian broadband kilometric radiation (bKOM), and we classified them according to their slope in the time–frequency spectrum and distinguish four categories with negative, positive, mixed, or no slope in freq…
Radial dependence of solar energetic particle peak fluxes and fluences: Multispacecraft observations based on Parker Solar Probe, Solar Orbiter, and near-Earth particle detectors
Guo, Jingnan; Wang, Yubao; Cao, Yihang
Context. We present a list of solar energetic particle (SEP) events detected by instruments on board the Solar and Heliospheric Observatory (SOHO), Parker Solar Probe (PSP), and Solar Orbiter between 2021 and 2023. The investigation focuses on identifying the peak flux and the fluence of SEP events in four energy ranges from 10.5 to 40 MeV, as obs…
Stability and instability of Langmuir waves via active subspace decompositions
Mattingly, G.; Longaker, B.; Palmer, N. +2 more
We study the stability and instability of Langmuir waves propagating in a hot, unmagnetized plasma modeled by the Vlasov–Poisson system and encompassing a variety of velocity distributions, including perturbations of Lorentzian, Kappa, and incomplete Maxwellian steady states. The influence of both high-frequency spatial perturbations and physical …
Constraints on the X-ray-to-radio fluence ratio of FRB 20240114A
Kadler, M.; Eppel, F.; Krumpe, M. +8 more
We report on multiwavelength observations of FRB 20240114A, a nearby (z = 0.13), hyperactive, repeating fast radio burst that was discovered in January 2024. We performed simultaneous observations of the source with the Effelsberg 100-m radio telescope, the Thai National Radio Telescope, the Astropeiler Stockert, and the X-ray satellite XMM-Newton…