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H0LiCOW - X. Spectroscopic/imaging survey and galaxy-group identification around the strong gravitational lens system WFI 2033-4723
Smith, M.; Annis, J.; Bertin, E. +65 more
Galaxies and galaxy groups located along the line of sight towards gravitationally lensed quasars produce high-order perturbations of the gravitational potential at the lens position. When these perturbation are too large, they can induce a systematic error on H0 of a few per cent if the lens system is used for cosmological inference an…
SPHERE view of the jet and the envelope of RY Tauri
Ménard, F.; Fantinel, D.; Podio, L. +40 more
Context. Jets are rarely associated with pre-main sequence intermediate-mass stars. This contrasts with the frequent detection of jets in lower mass or younger stars. Optical and near-IR observations of jet-driving sources are often hindered by the presence of a natal envelope.
Aims: Jets around partly embedded sources are a useful diagnostic…
The Orbits of 451 Wide Visual Double Stars
Izmailov, I. S.
Based on positional observations, we have determined the orbits of 130 visual double stars for the first time and improved the orbits of 321 stars. The histogram of eccentricities for all of the derived orbits corresponds to the relation f = 2e. The period distribution has two pronounced maxima at P ≈ 200 and ≈550 yr. The ephemeris relative positi…
Multiple nitrogen reservoirs in a protoplanetary disk at the epoch of comet and giant planet formation
Forveille, T.; Hily-Blant, P.; Magalhaes de Souza, V. +1 more
The isotopic ratio of nitrogen measured in primitive Solar System bodies shows a broad range of values, the origin of which remains unknown. One key question is whether these isotopic reservoirs of nitrogen predate the comet formation stage or are posterior to it. Another central question is elucidating the processes that can produce the observed …
Li Evolution and the Open Cluster NGC 6819: A Correlation between Li Depletion and Spindown in Dwarfs More Massive Than the F-Dwarf Li-Dip
Twarog, Bruce A.; Anthony-Twarog, Barbara J.; Deliyannis, Constantine P. +1 more
Spectroscopy of 333 NGC 6819 stars and Gaia astrometry are used to map Li evolution from the giant branch tip to 0.5 mag below the Li dip. Isochrone comparison with [Fe/H] = -0.04, based upon neural network spectroscopic analysis, produces an age of 2.25 (2.4) Gyr for E(B - V) = 0.16 (0.14) and (m - M) = 12.40 (12.29). Despite originating outside …
Molecular ion abundances in the diffuse ISM: CF+, HCO+, HOC+, and C3H+
Godard, B.; Roueff, E.; Gerin, M. +4 more
Aims: The transition between atomic and molecular hydrogen is associated with important changes in the structure of interstellar clouds, and marks the beginning of interstellar chemistry. Most molecular ions are rapidly formed (in ion-molecule reactions) and destroyed (by dissociative recombination) in the diffuse ISM. Because of the relative…
Cold Giant Planets Evaporated by Hot White Dwarfs
Gänsicke, Boris T.; Schreiber, Matthias R.; Toloza, Odette +2 more
Atmospheric escape from close-in Neptunes and hot Jupiters around Sun-like stars driven by extreme ultraviolet (EUV) irradiation plays an important role in the evolution of exoplanets and in shaping their ensemble properties. Intermediate and low mass stars are brightest at EUV wavelengths at the very end of their lives, after they have expelled t…
Rest-frame far-ultraviolet to far-infrared view of Lyman break galaxies at z = 3: Templates and dust attenuation
Ilbert, O.; Buat, V.; Burgarella, D. +2 more
Aims: This work explores, from a statistical point of view, the rest-frame far-ultraviolet (FUV) to far-infrared (FIR) emission of a population of Lyman-break galaxies (LBGs) at z ∼ 3 that cannot be individually detected from current FIR observations.
Methods: We performed a stacking analysis over a sample of ∼17 000 LBGs at redshift 2.5…
Modeling Mg II h, k and Triplet Lines at Solar Flare Ribbons
Kowalski, Adam F.; Carlsson, Mats; Tian, Hui +3 more
Observations from the Interface Region Imaging Spectrograph often reveal significantly broadened and non-reversed profiles of the Mg II h, k and triplet lines at flare ribbons. To understand the formation of these optically thick Mg II lines, we perform plane-parallel radiative hydrodynamics modeling with the RADYN code, and then recalculate the M…
A Momentum-conserving Accretion Disk Wind in the Narrow-line Seyfert 1 I Zwicky 1
Reeves, J. N.; Braito, V.
I Zwicky 1 (hereafter I Zw 1) is the prototype optical narrow-line Seyfert 1 galaxy. It is also a nearby (z = 0.0611), luminous quasi-stellar object (QSO), accreting close to the Eddington limit. XMM-Newton observations of I Zw 1 in 2015 reveal the presence of a broad and blueshifted P Cygni iron K profile, as observed through a blueshifted absorp…