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Initiation and Early Kinematic Evolution of Solar Eruptions
Inhester, B.; Cheng, X.; Ding, M. D. +5 more
We investigate the initiation and early evolution of 12 solar eruptions, including six active-region hot channel and six quiescent filament eruptions, which were well observed by the Solar Dynamics Observatory, as well as by the Solar Terrestrial Relations Observatory for the latter. The sample includes one failed eruption and 11 coronal mass ejec…
Structure of Brightest Cluster Galaxies and Intracluster Light
Brosch, N.; Schmidt, M.; Bender, R. +6 more
Observations of 170 local (z ≲ 0.08) galaxy clusters in the northern hemisphere have been obtained with the Wendelstein Telescope Wide Field Imager (WWFI). We correct for systematic effects such as point-spread function broadening, foreground star contamination, relative bias offsets, and charge persistence. Background inhomogeneities induced by s…
Magnetic Reconnection in the Space Sciences: Past, Present, and Future
Hesse, M.; Cassak, P. A.
Magnetic reconnection converts, often explosively, stored magnetic energy to particle energy in space and in the laboratory. Through processes operating on length scales that are tiny, it facilitates energy conversion over dimensions of, in some cases, hundreds of Earth radii. In addition, it is the mechanism behind large current disruptions in fu…
The accretion rates and mechanisms of Herbig Ae/Be stars
Mendigutía, I.; Vioque, M.; Oudmaijer, R. D. +3 more
This work presents a spectroscopic study of 163 Herbig Ae/Be stars. Amongst these, we present new data for 30 objects. Stellar parameters such as temperature, reddening, mass, luminosity, and age are homogeneously determined. Mass accretion rates are determined from Hα emission line measurements. Our data is complemented with the X-Shooter sample …
Wide-field Survey of Dwarf Satellite Systems around 10 Hosts in the Local Volume
Greene, Jenny E.; Beaton, Rachael L.; Carlsten, Scott G. +1 more
We present the results of an extensive search for dwarf satellite galaxies around 10 primary host galaxies in the Local Volume (LV, D < 12 Mpc) using archival CFHT/MegaCam imaging data. The hosts span a wide range in properties, with stellar masses ranging from that of the Large Magellanic Cloud to ∼3 times that of the Milky Way. The surveyed h…
The hot dayside and asymmetric transit of WASP-189 b seen by CHEOPS
Guterman, P.; Alonso, R.; Deleuil, M. +103 more
The CHEOPS space mission dedicated to exoplanet follow-up was launched in December 2019, equipped with the capacity to perform photometric measurements at the 20 ppm level. As CHEOPS carries out its observations in a broad optical passband, it can provide insights into the reflected light from exoplanets and constrain the short-wavelength thermal …
Optically thin spatially resolved Mg II emission maps the escape of ionizing photons
Chisholm, J.; Schaerer, D.; Henry, A. +2 more
Early star-forming galaxies produced copious ionizing photons. A fraction of these photons escaped gas within galaxies to reionize the entire Universe. This escape fraction is crucial for determining how the Universe became reionized, but the neutral intergalactic medium precludes direct measurement of the escape fraction at high redshifts. Indire…
Multiple populations in globular clusters and their parent galaxies
Da Costa, G. S.; Milone, A. P.; Cordoni, G. +14 more
The 'chromosome map' diagram (ChM) proved a successful tool to identify and characterize multiple populations (MPs) in 59 Galactic globular clusters (GCs). Here, we construct ChMs for 11 GCs of both Magellanic Clouds (MCs) and with different ages to compare MPs in Galactic and extragalactic environments, and explore whether this phenomenon is univ…
Helios-r2: A New Bayesian, Open-source Retrieval Model for Brown Dwarfs and Exoplanet Atmospheres
Apai, Dániel; Burgasser, Adam J.; Marley, Mark S. +5 more
We present an improved, hybrid CPU-GPU atmospheric retrieval code, Helios-r2, which is applicable to medium-resolution emission spectra of brown dwarfs, in preparation for precision atmospheric spectroscopy in the era of the James Webb Space Telescope. The model is available as open-source code on the Exoclimes Simulation Platform. We subject Heli…
The Sun is less active than other solar-like stars
Solanki, Sami K.; Reinhold, Timo; Shapiro, Alexander I. +4 more
The magnetic activity of the Sun and other stars causes their brightness to vary. We investigated how typical the Sun’s variability is compared with other solar-like stars, i.e., those with near-solar effective temperatures and rotation periods. By combining 4 years of photometric observations from the Kepler space telescope with astrometric data …