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Kinematics with Gaia DR2: the force of a dwarf
Anders, F.; Chiappini, C.; Santiago, B. X. +10 more
We use Gaia DR2 astrometric and line-of-sight velocity information combined with two sets of distances obtained with a Bayesian inference method to study the 3D velocity distribution in the Milky Way disc. We search for variations in all Galactocentric cylindrical velocity components (Vϕ, VR, and Vz) with Galactic …
New Constraints on the Nuclear Equation of State from the Thermal Emission of Neutron Stars in Quiescent Low-mass X-Ray Binaries
Guillot, Sebastien; Webb, Natalie; Reisenegger, Andreas +3 more
This paper presents a new analysis of the thermal emission from the neutron star (NS) surface to constrain the dense matter equation of state. We employ an empirical parameterization of the equation of state with a Markov Chain Monte Carlo approach to consistently fit the spectra of quiescent low-mass X-ray binaries in globular clusters with well-…
On the Mass Accretion Rate and Infrared Excess in Herbig Ae/Be Stars
Arun, R.; Mathew, Blesson; Manoj, P. +5 more
The present study makes use of the unprecedented capability of the Gaia mission to obtain the stellar parameters such as distance, age, and mass of HAeBe stars. The accuracy of Gaia DR2 astrometry is demonstrated from the comparison of the Gaia DR2 distances of 131 HAeBe stars with the previously estimated values from the literature. This is one o…
Universality of Lower Hybrid Waves at Earth's Magnetopause
Lavraud, B.; Génot, V.; André, M. +15 more
Waves around the lower hybrid frequency are frequently observed at Earth's magnetopause and readily reach very large amplitudes. Determining the properties of lower hybrid waves is crucial because they are thought to contribute to electron and ion heating, cross-field particle diffusion, anomalous resistivity, and energy transfer between electrons…
Gaia GraL: Gaia DR2 Gravitational Lens Systems. III. A systematic blind search for new lensed systems
Djorgovski, S. G.; Stern, D.; Surdej, J. +13 more
Aims: In this work, we aim to provide a reliable list of gravitational lens candidates based on a search performed over the entire Gaia Data Release 2 (Gaia DR2). We also aim to show that the astrometric and photometric information coming from the Gaia satellite yield sufficient insights for supervised learning methods to automatically identi…
The supernova remnant population of the Small Magellanic Cloud
Maitra, Chandreyee; Ballet, Jean; Sasaki, Manami +6 more
Aims: We present a comprehensive study on the supernova remnant (SNR) population of the Small Magellanic Cloud (SMC). We measured multiwavelength properties of the SMC SNRs and compare them to those of the Large Magellanic Cloud (LMC) population.
Methods: This study combines the large dataset of XMM-Newton observations of the SMC, archiv…
Helium Variation in Four Small Magellanic Cloud Globular Clusters
Milone, Antonino P.; Dotter, Aaron; Lagioia, Edoardo P. +1 more
The multiple stellar populations (MPs) of the ∼11-13 Gyr old globular clusters (GCs) in our Galaxy are characterized by the different content of several light elements. These elements describe well-defined patterns like the C-N and the Na-O anticorrelations and the He-N and Na-N correlations. The discovery of MPs in Magellanic Cloud GCs opened up …
Scattered light shadows in warped protoplanetary discs
Pinte, Christophe; Mentiplay, Daniel; Alexander, Richard +2 more
3D hydrodynamic numerical simulations have demonstrated that the structure of a protoplanetary disc may be strongly affected by a planet orbiting in a plane that is misaligned to the disc. When the planet is able to open a gap, the disc is separated into an inner, precessing disc and an outer disc with a warp. In this work, we compute infrared sca…
Rapid Rotation in the Kepler Field: Not a Single Star Phenomenon
Simonian, Gregory V. A.; Pinsonneault, Marc H.; Terndrup, Donald M.
Tens of thousands of rotation periods have been measured in the Kepler fields, including a substantial fraction of rapid rotators. We use Gaia parallaxes to distinguish photometric binaries (PBs; from single stars on the unevolved lower main sequence, and compare their distribution of rotation properties to those of single stars both with and with…
The GAPS Programme with HARPS-N at TNG. XIX. Atmospheric Rossiter-McLaughlin effect and improved parameters of KELT-9b
Scandariato, G.; Pagano, I.; Fossati, L. +40 more
Aims: In the framework of the GAPS project, we observed the planet-hosting star KELT-9 (A-type star, v sin i 110 km s-1) with the HARPS-N spectrograph at the Telescopio Nazionale Galileo. In this work we analyse the spectra and the extracted radial velocities to constrain the physical parameters of the system and to detect the plan…