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Orbital Evidences for Dark-matter-free Milky Way Dwarf Spheroidal Galaxies
Hammer, Francois; Babusiaux, Carine; Bonifacio, Piercarlo +4 more
The nature of Milky Way dwarf spheroidals (MW dSphs) has been questioned, in particular whether they are dominated by dark matter (DM). Here we investigate an alternative scenario, for which tidal shocks are exerted by the MW to DM-free dSphs after a first infall of their gas-rich progenitors, and for which theoretical calculations have been verif…
New and improved rotational periods of magnetic CP stars from ASAS-3, KELT, and MASCARA data
Paunzen, Ernst; Hümmerich, Stefan; Bernhard, Klaus
Magnetic chemically peculiar (mCP) stars allow the investigation of such diverse phenomena as atomic diffusion, magnetic fields, and stellar rotation. The aim of the present investigation is to enhance our knowledge of the rotational properties of mCP stars by increasing the sample of objects with accurately determined rotational periods. To this …
Gravitational-wave Radiation of Double Degenerates with Extremely Low-mass White Dwarf Companions
Han, Zhanwen; Chen, Xuefei; Li, Zhenwei +3 more
Double degenerate (DD) systems are supposed to be significant gravitational-wave (GW) sources for future space-based GW detectors, e.g., the Laser Interferometer Space Antenna (LISA). Recently, one type of DD system with extremely low-mass WD (ELM WD; ≲ 0.30 M⊙) companions was found in the ELM Survey. These companions have very short or…
Evolution of the Alfvén Mach number associated with a coronal mass ejection shock
Gallagher, Peter T.; Carley, Eoin P.; Maguire, Ciara A. +1 more
The Sun regularly produces large-scale eruptive events, such as coronal mass ejections (CMEs) that can drive shock waves through the solar corona. Such shocks can result in electron acceleration and subsequent radio emission in the form of a type II radio burst. However, the early-phase evolution of shock properties and its relationship to type II…
Three short-period Jupiters from TESS. HIP 65Ab, TOI-157b, and TOI-169b
Tamura, M.; Bouchy, F.; Henning, T. +74 more
We report the confirmation and mass determination of three hot Jupiters discovered by the Transiting Exoplanet Survey Satellite (TESS) mission: HIP 65Ab (TOI-129, TIC-201248411) is an ultra-short-period Jupiter orbiting a bright (V = 11.1 mag) K4-dwarf every 0.98 days. It is a massive 3.213 ± 0.078 MJ planet in a grazing transit configu…
The Lyman Alpha Reference Sample. X. Predicting Lyα Output from Star-forming Galaxies Using Multivariate Regression
Hayes, Matthew; Östlin, Göran; Melinder, Jens +4 more
Understanding the production and escape of Lyα radiation from star-forming galaxies is a long-standing problem in astrophysics. The ability to predict the Lyα luminosity of galaxies would open up new ways of exploring the epoch of reionization (EOR) and estimating Lyα emission from galaxies in cosmological simulations where radiative transfer calc…
Transits of Known Planets Orbiting a Naked-eye Star
Butler, R. Paul; Kristiansen, Martti H.; Vanderburg, Andrew +45 more
Some of the most scientifically valuable transiting planets are those that were already known from radial velocity (RV) surveys. This is primarily because their orbits are well characterized and they preferentially orbit bright stars that are the targets of RV surveys. The Transiting Exoplanet Survey Satellite (TESS) provides an opportunity to sur…
Molecular complexity in pre-stellar cores: a 3 mm-band study of L183 and L1544
Bizzocchi, Luca; Caselli, Paola; Vastel, Charlotte +4 more
Context. Pre-stellar cores (PSCs) are units of star formation. Besides representing early stages of the dynamical evolution leading to the formation of stars and planets, PSCs also provide a substrate for incipient chemical complexity in the interstellar space.
Aims: Our aim is to understand the influence of external conditions on the chemica…
The BepiColombo Mercury Imaging X-Ray Spectrometer: Science Goals, Instrument Performance and Operations
Bunce, Emma J.; Muinonen, Karri; Kallio, Esa +68 more
The Mercury Imaging X-ray Spectrometer is a highly novel instrument that is designed to map Mercury's elemental composition from orbit at two angular resolutions. By observing the fluorescence X-rays generated when solar-coronal X-rays and charged particles interact with the surface regolith, MIXS will be able to measure the atomic composition of …
Precise astrometry and diameters of asteroids from occultations - a data set of observations and their interpretation
Herald, David; Gault, David; Anderson, Robert +10 more
Occultations of stars by asteroids have been observed since 1961, increasing from a very small number to now over 500 annually. We have created and regularly maintain a growing data set of more than 5000 observed asteroidal occultations. The data set includes the raw observations, astrometry at the 1 mas level based on centre of mass or figure (no…