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Constraining the properties of HD 206893 B. A combination of radial velocity, direct imaging, and astrometry data
Aigrain, S.; Rouan, D.; Meunier, N. +25 more
Context. High contrast imaging enables the determination of orbital parameters for substellar companions (planets, brown dwarfs) from the observed relative astrometry and the estimation of model and age-dependent masses from their observed magnitudes or spectra. Combining astrometric positions with radial velocity gives direct constraints on the o…
Multispacecraft Analysis of Electron Holes
Russell, C. T.; Vaivads, A.; Khotyaintsev, Yu. V. +4 more
Electron holes (EHs) are nonlinear electrostatic structures in plasmas. Most previous in situ studies of EHs have been limited to single- and two-spacecraft methods. We present statistics of EHs observed by Magnetospheric Multiscale on the magnetospheric side of the magnetopause during October 2016 when the spacecraft separation was around 6 km. E…
Investigating ULX accretion flows and cyclotron resonance in NGC 300 ULX1
Haberl, F.; Buchner, J.; Vasilopoulos, G. +2 more
Aims: We investigate accretion models for the newly discovered pulsating ultraluminous X-ray source (ULX) NGC 300 ULX1.
Methods: We analyzed broadband XMM-Newton and NuSTAR observations of NGC 300 ULX1, performing phase-averaged and phase-resolved spectroscopy. Using the Bayesian framework, we compared two physically motivated models for…
The VMC survey - XXXIV. Morphology of stellar populations in the Magellanic Clouds
Girardi, Léo; de Grijs, Richard; Ripepi, Vincenzo +11 more
The Magellanic Clouds are nearby dwarf irregular galaxies whose morphologies show different properties when traced by different stellar populations, making them an important laboratory for studying galaxy morphologies. We study the morphology of the Magellanic Clouds using data from the Visible and Infrared Survey Telescope for Astronomy survey of…
From Scattered-light to Millimeter Emission: A Comprehensive View of the Gigayear-old System of HD 202628 and its Eccentric Debris Ring
Hughes, A. Meredith; Wilner, David J.; Stapelfeldt, Karl R. +13 more
We present here new observations of the eccentric debris ring surrounding the Gyr-old solar-type star HD 202628: at millimeter wavelengths with ALMA, at far-infrared wavelengths with Herschel, and in scattered light with the Hubble Space Telescope (HST). The ring inner edge is found to be consistent between ALMA and HST data. As radiation pressure…
Prolonged sub-luminous state of the new transitional pulsar candidate CXOU J110926.4‑650224
Rea, Nanda; Coti Zelati, Francesco; Torres, Diego F. +12 more
We report on a multi-wavelength study of the unclassified X-ray source CXOU J110926.4‑650224 (J1109). We identified the optical counterpart as a blue star with a magnitude of ∼20.1 (3300–10500 Å). The optical emission was variable on timescales from hundreds to thousands of seconds. The spectrum showed prominent emission lines with variable profil…
Revealing the cosmic evolution of boxy/peanut-shaped bulges from HST COSMOS and SDSS
Debattista, Victor P.; Erwin, Peter; Lintott, Chris +1 more
Vertically thickened bars, observed in the form of boxy/peanut (B/P) bulges, are found in the majority of massive barred disc galaxies in the local Universe, including our own. B/P bulges indicate that their host bars have suffered violent bending instabilities driven by anisotropic velocity distributions. We investigate for the first time how the…
Measuring the local matter density using Gaia DR2
Widmark, A.
Aims: We determine the total dynamical matter density in the solar neighbourhood using the second Gaia data release (DR2).
Methods: The dynamical matter density distribution is inferred in a framework of a Bayesian hierarchical model, which accounts for position and velocity of all individual stars, as well as the full error covariance m…
K2-264: a transiting multiplanet system in the Praesepe open cluster
Cochran, William D.; Endl, Michael; Tamura, Motohide +31 more
Planet host stars with well-constrained ages provide a rare window to the time domain of planet formation and evolution. The NASA K2 mission has enabled the discovery of the vast majority of known planets transiting stars in clusters, providing a valuable sample of planets with known ages and radii. We present the discovery of two planets transiti…
On the usefulness of existing solar wind models for pulsar timing corrections
Dettmar, R. -J.; Kramer, M.; Zucca, P. +15 more
Dispersive delays due to the solar wind introduce excess noise in high-precision pulsar timing experiments, and must be removed in order to achieve the accuracy needed to detect, e.g., low-frequency gravitational waves. In current pulsar timing experiments, this delay is usually removed by approximating the electron density distribution in the sol…