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The ALMA Spectroscopic Survey in the Hubble Ultra Deep Field: CO Excitation and Atomic Carbon in Star-forming Galaxies at z = 1-3
Carilli, Chris; Inami, Hanae; Boogaard, Leindert A. +16 more
We investigate the CO excitation and interstellar medium (ISM) conditions in a cold gas mass-selected sample of 22 star-forming galaxies at z = 0.46-3.60, observed as part of the ALMA Spectroscopic Survey in the Hubble Ultra Deep Field (ASPECS). Combined with Very Large Array follow-up observations, we detect a total of 34 CO $J\to J-1$ transition…
Gaia white dwarfs within 40 pc II: the volume-limited Northern hemisphere sample
Toonen, Silvia; Rebassa-Mansergas, Alberto; Gänsicke, Boris T. +6 more
We present an overview of the sample of Northern hemisphere white dwarfs within 40 pc of the Sun detected from Gaia Data Release 2 (DR2). We find that 521 sources are spectroscopically confirmed degenerate stars, 111 of which were first identified as white dwarf candidates from Gaia DR2 and followed up recently with the William Herschel Telescope …
Photometric detection of internal gravity waves in upper main-sequence stars. II. Combined TESS photometry and high-resolution spectroscopy
Simón-Díaz, S.; Aerts, C.; Bowman, D. M. +5 more
Context. Massive stars are predicted to excite internal gravity waves (IGWs) by turbulent core convection and from turbulent pressure fluctuations in their near-surface layers. These IGWs are extremely efficient at transporting angular momentum and chemical species within stellar interiors, but they remain largely unconstrained observationally.
Untangling the Galaxy. II. Structure within 3 kpc
Stassun, Keivan G.; Kounkel, Marina; Covey, Kevin
We present the results of the hierarchical clustering analysis of the Gaia DR2 data to search for clusters, comoving groups, and other stellar structures. The current paper builds on the sample from the previous work, extending it in distance from 1 to 3 kpc and increasing the number of identified structures up to 8292. To aid in the analysis of t…
Galactic cirri in deep optical imaging
Trujillo, Ignacio; Román, Javier; Montes, Mireia
The ubiquitous presence of Galactic cirri in deep optical images represents a major obstacle to study the low surface brightness features of extragalactic sources. To address this issue, we have explored the optical properties of cirri using g, r, i, and z bands in the Sloan Digital Sky Survey (SDSS) Stripe82 region. Using state-of-the-art, custom…
Particle Dynamics in the Earth's Radiation Belts: Review of Current Research and Open Questions
Li, X.; Ukhorskiy, A. Y.; Fennell, J. F. +4 more
The past decade transformed our observational understanding of energetic particle processes in near-Earth space. An unprecedented suite of observational systems was in operation including the Van Allen Probes, Arase, Magnetospheric Multiscale, Time History of Events and Macroscale Interactions during Substorms, Cluster, GPS, GOES, and Los Alamos N…
Properties of the dense core population in Orion B as seen by the Herschel Gould Belt survey
White, G. J.; André, Ph.; Arzoumanian, D. +15 more
We present a detailed study of the Orion B molecular cloud complex (d ~ 400 pc), which was imaged with the PACS and SPIRE photometric cameras at wavelengths from 70 to 500 µm as part of the Herschel Gould Belt survey (HGBS). We release new high-resolution maps of column density and dust temperature for the whole complex, derived in the same …
Expected performances of the Characterising Exoplanet Satellite (CHEOPS). III. Data reduction pipeline: architecture and simulated performances
Guterman, P.; Deleuil, M.; Benz, W. +4 more
The CHaracterizing ExOPlanet Satellite (CHEOPS) is set to be launched in December 2019 and will detect and characterize small size exoplanets via ultra high precision photometry during transits. CHEOPS is designed as a follow-up telescope and therefore it will monitor a single target at a time. The scientific users will retrieve science-ready ligh…
Atmospheric Dynamics of Hot Giant Planets and Brown Dwarfs
Showman, Adam P.; Parmentier, Vivien; Tan, Xianyu
Groundbased and spacecraft telescopic observations, combined with an intensive modeling effort, have greatly enhanced our understanding of hot giant planets and brown dwarfs over the past ten years. Although these objects are all fluid, hydrogen worlds with stratified atmospheres overlying convective interiors, they exhibit an impressive diversity…
Very regular high-frequency pulsation modes in young intermediate-mass stars
Smalley, Barry; Li, Yaguang; Li, Gang +33 more
Asteroseismology probes the internal structures of stars by using their natural pulsation frequencies1. It relies on identifying sequences of pulsation modes that can be compared with theoretical models, which has been done successfully for many classes of pulsators, including low-mass solar-type stars2, red giants3