Search Publications
Combining magneto-hydrostatic constraints with Stokes profiles inversions. II. Application to Hinode/SP observations
Pastor Yabar, A.; Ruiz Cobo, B.; Borrero, J. M.
Context. Inversion techniques applied to the radiative transfer equation for polarized light are capable of inferring the physical parameters in the solar atmosphere (temperature T, magnetic field B, and line-of-sight velocity vlos) from observations of the Stokes vector (i.e., spectropolarimetric observations) in spectral lines. Infere…
The Hubble PanCET program: long-term chromospheric evolution and flaring activity of the M dwarf host GJ 3470
Sanz-Forcada, J.; Ehrenreich, D.; Bourrier, V. +9 more
Neptune-size exoplanets seem particularly sensitive to atmospheric evaporation, making it essential to characterize the stellar high-energy radiation that drives this mechanism. This is particularly important with M dwarfs, which emit a large and variable fraction of their luminosity in the ultraviolet and can display strong flaring behavior. The …
Frequencies, chaos, and resonances: A study of orbital parameters of nearby thick-disc and halo stars
Helmi, Amina; Koppelman, Helmer H.; Hagen, Jorrit H. J.
Aims: We study the distribution of nearby thick-disc and halo stars in subspaces defined by their characteristic orbital parameters. Our aim is to establish the origin of the structure reported in particular in the Rmax - zmax space.
Methods: To this end, we computed the orbital parameters and frequencies of stars f…
Extended envelopes around Galactic Cepheids. V. Multi-wavelength and time-dependent analysis of IR excess
Kervella, P.; Mérand, A.; Lagadec, E. +6 more
Aims: We aim to investigate the infrared excess of 45 Milky Way (MW) Cepheids combining different observables in order to constrain the presence of circumstellar envelopes (CSEs).
Methods: We used the SpectroPhoto-Interferometry of Pulsating Stars (SPIPS) algorithm, a robust implementation of the parallax-of-pulsation method that combine…
Search for candidate strongly lensed dusty galaxies in the Planck satellite catalogues
Burigana, C.; Herranz, D.; Trombetti, T. +5 more
The shallow, all-sky Planck surveys at sub-millimetre wavelengths have detected the brightest strongly gravitationally lensed dusty galaxies in the sky. The combination of their extreme gravitational flux-boosting and image-stretching offers the unique possibility of measuring in extraordinary detail the galaxy structure and kinematics in early ev…
Statistical study of electron density turbulence and ion-cyclotron waves in the inner heliosphere: Solar Orbiter observations
Maksimovic, M.; Bale, S. D.; Chust, T. +27 more
Context. The recently released spacecraft potential measured by the RPW instrument on board Solar Orbiter has been used to estimate the solar wind electron density in the inner heliosphere.
Aims: The measurement of the solar wind's electron density, taken in June 2020, has been analysed to obtain a thorough characterization of the turbulence …
A case study of ACV variables discovered in the Zwicky Transient Facility survey
Paunzen, E.; Prišegen, M.; Faltová, N. +6 more
Context. Magnetic chemically peculiar (mCP) stars exhibit complex atmospheres that allow the investigation of the interplay of atomic diffusion, magnetic fields, and stellar rotation. A non-uniform surface distribution of chemical elements and the non-alignment of the rotational and magnetic axes result in the variability of several observables. P…
CO isotopolog line fluxes of viscously evolving disks. Cold CO conversion insufficient to explain observed low fluxes
van Dishoeck, E. F.; Rosotti, G.; Trapman, L. +2 more
Context. Protoplanetary disks are thought to evolve viscously, where the disk mass - the reservoir available for planet formation - decreases over time as material is accreted onto the central star over a viscous timescale. Observations have shown a correlation between disk mass and the stellar mass accretion rate, as expected from viscous theory.…
Solar Orbiter/RPW antenna calibration in the radio domain and its application to type III burst observations
Maksimovic, M.; Bale, S. D.; Chust, T. +18 more
Context. In order to allow for a comparison with the measurements from other antenna systems, the voltage power spectral density measured by the Radio and Plasma waves receiver (RPW) on board Solar Orbiter needs to be converted into physical quantities that depend on the intrinsic properties of the radiation itself (e.g., the brightness of the sou…
Runaway blue main-sequence stars at high Galactic latitudes. Target selection with Gaia and spectroscopic identification
Raddi, Roberto; Irrgang, Andreas; Heber, Ulrich +2 more
Context. The ESA Gaia mission is a remarkable tool for stellar population analysis through its accurate Hertzsprung-Russell diagram. Its precise astrometry has propelled detailed kinematic studies of the Milky Way and the identification of high-velocity outliers.
Aims: Motivated by the historical identification of runaway main-sequence (MS) s…