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Model independent H(z) reconstruction using the cosmic inverse distance ladder
Efstathiou, George; Lemos, Pablo; Lee, Elizabeth +1 more
Recent distance ladder determinations of the Hubble constant H0 disagree at about the 3.5σ level with the value determined from Planck measurements of the cosmic microwave background (CMB) assuming a ΛCDM† cosmology. This discrepancy has prompted speculation that new physics might be required beyond that assumed in the ΛCDM m…
Red and dead CANDELS: massive passive galaxies at the dawn of the Universe
Castellano, M.; Pentericci, L.; Santini, P. +7 more
We search the five CANDELS fields (COSMOS, EGS, GOODS-North, GOODS-South, and UDS) for passively evolving a.k.a. `red and dead' massive galaxies in the first 2 Gyr after the big bang, integrating and updating the work on GOODS-South presented in a previous paper. We perform SED-fitting on photometric data, with top-hat star-formation histories to …
Phat ELVIS: The inevitable effect of the Milky Way's disc on its dark matter subhaloes
Bullock, James S.; Kelley, Tyler; Garrison-Kimmel, Shea +3 more
We introduce an extension of the ELVIS project to account for the effects of the Milky Way galaxy on its subhalo population. Our simulation suite, Phat ELVIS, consists of 12 high-resolution cosmological dark matter-only (DMO) zoom simulations of Milky Way-size ΛCDM haloes [Mv = (0.7-2) × 1012 M⊙] along with 12 re-r…
The MUSE-Wide Survey: survey description and first data release
Steinmetz, M.; Diener, C.; Enke, H. +17 more
We present the MUSE-Wide survey, a blind, 3D spectroscopic survey in the CANDELS/GOODS-S and CANDELS/COSMOS regions. The final survey will cover 100 × 1 arcmin2 MUSE fields. Each MUSE-Wide pointing has a depth of one hour and hence targets more extreme and more luminous objects over ten times the area of the MUSE-Deep fields. The legacy…
Two New HATNet Hot Jupiters around A Stars and the First Glimpse at the Occurrence Rate of Hot Jupiters from TESS
Latham, David W.; Narita, N.; Cochran, W. D. +68 more
Wide-field surveys for transiting planets are well suited to searching diverse stellar populations, enabling a better understanding of the link between the properties of planets and their parent stars. We report the discovery of HAT-P-69 b (TOI 625.01) and HAT-P-70 b (TOI 624.01), two new hot Jupiters around A stars from the Hungarian-made Automat…
A Multimass Velocity Dispersion Model of 47 Tucanae Indicates No Evidence for an Intermediate-mass Black Hole
Anderson, Jay; Caiazzo, Ilaria; Baumgardt, Holger +6 more
In this paper, we analyze stellar proper motions in the core of the globular cluster 47 Tucanae to explore the possibility of an intermediate-mass black hole (IMBH) influence on the stellar dynamics. Our use of short-wavelength photometry affords us an exceedingly clear view of stellar motions into the very center of the crowded core, yielding pro…
The Galactic WN stars revisited. Impact of Gaia distances on fundamental stellar parameters
Hamann, W. -R.; Oskinova, L. M.; Sander, A. A. C. +6 more
Comprehensive spectral analyses of the Galactic Wolf-Rayet stars of the nitrogen sequence (i.e. the WN subclass) have been performed in a previous paper. However, the distances of these objects were poorly known. Distances have a direct impact on the "absolute" parameters, such as luminosities and mass-loss rates. The recent Gaia Data Release (DR2…
High-resolution confirmation of an extended helium atmosphere around WASP-107b
Aceituno, J.; Ehrenreich, D.; Lovis, C. +7 more
Context. Probing the evaporation of exoplanet atmospheres is key to understanding the formation and evolution of exoplanetary systems. The main tracer of evaporation in the UV is the Lyman-α transition, which can reveal extended exospheres of neutral hydrogen. Recently, the near-infrared (NIR) metastable helium triplet (10 833 Å) revealed extended…
Disruption of the Orion molecular core 1 by wind from the massive star θ1 Orionis C
Teyssier, D.; Goicoechea, J. R.; Stutzki, J. +10 more
Massive stars inject mechanical and radiative energy into the surrounding environment, which stirs it up, heats the gas, produces cloud and intercloud phases in the interstellar medium, and disrupts molecular clouds (the birth sites of new stars1,2). Stellar winds, supernova explosions and ionization by ultraviolet photons control the l…
The Fall of a Giant. Chemical evolution of Enceladus, alias the Gaia Sausage
Silva Aguirre, Victor; Matteucci, Francesca; Miglio, Andrea +4 more
We present the first chemical evolution model for Enceladus, alias the Gaia Sausage, to investigate the star formation history of one of the most massive satellites accreted by the Milky Way during a major merger event. Our best chemical evolution model for Enceladus nicely fits the observed stellar [α/Fe]-[Fe/H] chemical abundance trends, and rep…