Search Publications
Kepler-411: a four-planet system with an active host star
Schmitt, J. H. M. M.; Wang, X.; Ioannidis, P. +3 more
We present a detailed characterization of the Kepler-411 system (KOI 1781). This system was previously known to host two transiting planets: one with a period of 3 days (R = 2.4 R⊕; Kepler-411b) and one with a period of 7.8 days (R = 4.4 R⊕; Kepler-411c), as well as a transiting planetary candidate with a 58-day period (R = 3…
Multiplicity of Galactic Cepheids and RR Lyrae stars from Gaia DR2. II. Resolved common proper motion pairs
Mérand, Antoine; Evans, Nancy Remage; Gieren, Wolfgang +6 more
Context. The multiplicity of classical Cepheids (CCs) and RR Lyrae stars (RRLs) is still imperfectly known, particularly for RRLs.
Aims: In order to complement the close-in short orbital period systems presented in Paper I, our aim is to detect the wide, spatially resolved companions of the targets of our reference samples of Galactic CCs and…
The role of molecular filaments in the origin of the prestellar core mass function and stellar initial mass function
André, Ph.; Arzoumanian, D.; Könyves, V. +2 more
Context. The origin of the stellar initial mass function (IMF) is one of the most debated issues in astrophysics.
Aims: Here we explore the possible link between the quasi-universal filamentary structure of star-forming molecular clouds and the origin of the IMF.
Methods: Based on our recent comprehensive study of filament properties fro…
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…
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…
A 3D view of the Hyades stellar and sub-stellar population
Smart, R. L.; Lodieu, N.; Pérez-Garrido, A. +1 more
Aims: Our scientific goal is to provide a 3D map of the nearest open cluster to the Sun, the Hyades, combining the recent release of Gaia astrometric data, ground-based parallaxes of sub-stellar member candidates and photometric data from surveys which cover large areas of the cluster.
Methods: We combined the second Gaia release with gr…
Optical polarised phase function of the HR 4796A dust ring
Pinte, C.; Ménard, F.; Avenhaus, H. +23 more
Context. The scattering properties of the dust originating from debris discs are still poorly known. The analysis of scattered light is however a powerful remote-sensing tool to understand the physical properties of dust particles orbiting other stars. Scattered light is indeed widely used to characterise the properties of cometary dust in the sol…
A method for global inversion of multi-resolution solar data
de la Cruz Rodríguez, J.
Understanding the complex dynamics and structure of the upper solar atmosphere strongly benefits from the use of a combination of several diagnostics. Frequently, such diverse diagnostics can only be obtained from telescopes and/or instrumentation operating at widely different spatial resolution. To optimize the utilization of such data, we propos…
Stellar ages, masses, and radii from asteroseismic modeling are robust to systematic errors in spectroscopy
Hekker, S.; Basu, S.; Stokholm, A. +2 more
Context. The search for twins of the Sun and Earth relies on accurate characterization of stellar and the exoplanetary parameters age, mass, and radius. In the modern era of asteroseismology, parameters of solar-like stars are derived by fitting theoretical models to observational data, which include measurements of their oscillation frequencies, …