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Rotation rate of the solar core as a key constraint to magnetic angular momentum transport in stellar interiors
Buldgen, G.; Eggenberger, P.; Salmon, S. J. A. J.
Context. The internal rotation of the Sun constitutes a fundamental constraint when modelling angular momentum transport in stellar interiors. In addition to the more external regions of the solar radiative zone probed by pressure modes, measurements of rotational splittings of gravity modes would offer an invaluable constraint on the rotation of …
On the lack of correlation between [O III]/[O II] and Lyman continuum escape fraction
Ryan-Weber, E. V.; Nanayakkara, T.; Sawicki, M. +9 more
We present the first results of our pilot study of eight photometrically selected Lyman-continuum (LyC) emitting galaxy candidates from the COSMOS field and focus on their optical emission line ratios. Observations were performed in the H and K bands using the Multi-Object Spectrometer for Infra-Red Exploration (MOSFIRE) instrument at the Keck Obs…
On the Gas Content, Star Formation Efficiency, and Environmental Quenching of Massive Galaxies in Protoclusters at z ≈ 2.0-2.5
Treister, E.; Toft, S.; Scoville, N. +10 more
We present ALMA Band 6 (ν = 233 GHz, λ = 1.3 mm) continuum observations toward 68 “normal” star-forming galaxies within two Coma-like progenitor structures at z = 2.10 and 2.47, from which ISM masses are derived, providing the largest census of molecular gas mass in overdense environments at these redshifts. Our sample comprises galaxies with a st…
An alternative interpretation of the exomoon candidate signal in the combined Kepler and Hubble data of Kepler-1625
Heller, René; Rodenbeck, Kai; Bruno, Giovanni
Context. Kepler and Hubble photometry of a total of four transits by the Jupiter-sized exoplanet Kepler-1625 b have recently been interpreted to show evidence of a Neptune-sized exomoon. The key arguments were an apparent drop in stellar brightness after the planet's October 2017 transit seen with Hubble and its 77.8 min early arrival compared to …
The search for multiple populations in Magellanic Clouds clusters - V. Correlation between cluster age and abundance spreads
Martocchia, S.; Dalessandro, E.; Salaris, M. +13 more
In our HST photometric survey, we have been searching for multiple stellar populations (MPs) in Magellanic Clouds (MCs) massive star clusters which span a significant range of ages (∼1.5-11 Gyr). In the previous papers of the series, we have shown that the age of the cluster represents one of the key factors in shaping the origin of the chemical a…
VISION - Vienna survey in Orion. III. Young stellar objects in Orion A
Meingast, Stefan; Alves, João; Bouy, Hervé +14 more
We have extended and refined the existing young stellar object (YSO) catalogs for the Orion A molecular cloud, the closest massive star-forming region to Earth. This updated catalog is driven by the large spatial coverage (18.3 deg2, ∼950 pc2), seeing limited resolution (∼0.7″), and sensitivity (Ks < 19 mag) of …
Detection and characterisation of 54 massive companions with the SOPHIE spectrograph. Seven new brown dwarfs and constraints on the brown dwarf desert
Bouchy, F.; Deleuil, M.; Moutou, C. +35 more
Context. Brown dwarfs (BD) are substellar objects intermediate between planets and stars with masses of ~13-80 MJ. While isolated BDs are most likely produced by gravitational collapse in molecular clouds down to masses of a few MJ, a non-negligible fraction of low-mass companions might be formed through the planet-formation …
A Comparison of Flare Forecasting Methods. III. Systematic Behaviors of Operational Solar Flare Forecasting Systems
Leka, K. D.; Gallagher, Peter T.; Murray, Sophie A. +21 more
A workshop was recently held at Nagoya University (2017 October 31-November 2), sponsored by the Center for International Collaborative Research, at the Institute for Space-Earth Environmental Research, Nagoya University, Japan, to quantitatively compare the performance of today’s operational solar flare forecasting facilities. Building upon Paper…
Relationship between the Metallicity of the Circumgalactic Medium and Galaxy Orientation
Charlton, Jane C.; Kacprzak, Glenn G.; Churchill, Christopher W. +4 more
We investigate the geometric distribution of gas metallicities in the circumgalactic medium (CGM) around 47, z < 0.7 galaxies from the “Multiphase Galaxy Halos” Survey. Using a combination of quasar spectra from Hubble Space Telescope (HST)/COS and from Keck/HIRES or Very Large Telescope/UVES, we measure column densities of, or determine limits…
Dimensionality, Coordinate System and Reference Frame for Analysis of In-Situ Space Plasma and Field Data
Wei, Y.; Zong, Q. -G.; Hasegawa, H. +11 more
In the analysis of in-situ space plasma and field data, an establishment of the coordinate system and the frame of reference, helps us greatly simplify a given problem and provides the framework that enables a clear understanding of physical processes by ordering the experimental data. For example, one of the most important tasks of space data ana…