Search Publications
Frequency analysis of the hybrid δ Sct-γ Dor star CoRoT-102314644
Creevey, O. L.; Pichon, B.; Sánchez Arias, J. P. +1 more
Context. Observations from space missions allowed significant progress due to the absence of atmospheric noise contributions and having uninterrupted data sets. This has been extremely beneficial in asteroseismology because many oscillation frequencies, not observable from the ground, can be detected. One example of this success is the large numbe…
Blending from binarity in microlensing searches toward the Large Magellanic Cloud
Moniez, M.; Blaineau, T.
Context. Studies of gravitational microlensing effects require the estimation of their detection efficiency as soon as one wants to quantify the massive compact objects along the line of sight of source targets. This is particularly important for setting limits on the contribution of massive compact objects to the Galactic halo. These estimates of…
Reconstruction of total solar irradiance variability as simultaneously apparent from Solar Orbiter and Solar Dynamics Observatory
Schmidt, W.; Woch, J.; Solanki, S. K. +42 more
Solar irradiance variability has been monitored almost exclusively from the Earth's perspective. We present a method to combine the unprecedented observations of the photospheric magnetic field and continuum intensity from outside the Sun-Earth line, which is being recorded by the Polarimetric and Helioseismic Imager on board the Solar Orbiter mis…
HCS background magnetic field study HYTARO+
Hidalgo, M. A.; Blanco, J. J.; Arrazola, D.
Context. HYTARO+ is an analytical model developed to evaluate the influence of the solar magnetic dipole in the topology of the local structure of the heliospheric current sheet (HCS).
Aims: Statistical methods such as MVA, which are typically used in the study of the HCS come with two limitations. On one hand, they do not provide any informa…
New constraints on the presence of debris disks around G 196-3 B and VHS J125601.92-125723.9 b
Zakhozhay, Olga V.; Rebolo, Rafael; Semenov, Dmitry A. +10 more
Context. The existence of warm (protoplanetary) disks around very young isolated planetary and brown dwarf mass objects is known based on near- and mid-infrared flux excesses and millimeter observations. These disks may later evolve into debris disks or rings, although none have been observed or confirmed so far. Little is known about circum(sub)s…
A deep Hα survey of the Carina tangent arm direction
Zavagno, A.; Elia, D.; Molinari, S. +3 more
Aims: The arm tangent direction provides a unique viewing geometry, with a long path in relatively narrow velocity ranges and lines of view that cross the arm perpendicular to its thickness. The spiral arm tangent regions are therefore the best directions for studying the interstellar medium within spiral density waves in the Milky Way, probi…
Apsidal motion in the α CrB binary system revealed through X-ray and optical eclipse timing
Schmitt, J. H. M. M.; Czesla, S.; Robrade, J. +1 more
The α CrB system is among the brightest known eclipsing binaries in an eccentric orbit. In such systems, the periods between successive primary (Pprim) and secondary minima (Psec) typically differ, and the difference between the two periods provides information on apsidal motion in the system. However, with a binary period of…
BCD spectrophotometry for massive stars in transition phases
Zorec, J.; Borges Fernandes, M.; Kraus, M. +7 more
Context. Stars in transition phases, such as those showing the B[e] phenomenon and luminous blue variables (LBVs), undergo strong, often irregular mass-ejection events. The prediction of these phases in stellar evolution models is therefore extremely difficult, if not impossible. As a result, their effective temperatures, their luminosities, and e…
The nature of the solar wind electron temperature and electron heat flux. II. Case of a spiral interplanetary magnetic field
Salem, Chadi S.; Pulupa, Marc; Hubert, Daniel
Aims: We aim to analyze the solutions of the solar wind electron energy equation in a spherical expansion with a spiral interplanetary magnetic field (IMF), a radial power law of the electron heat flux with a constant index α, and a constant or a smooth increase of the solar wind speed.
Methods: Generic analytical electron temperature pr…
Model-independent periodogram for scanning astrometry
Zucker, S.; Binnenfeld, A.; Shahaf, S.
We present a new periodogram for the periodicity detection in one-dimensional time-series data from scanning astrometry space missions such as HIPPARCOS or Gaia. The periodogram is non-parametric and does not rely on a full or approximate orbital solution. Since no specific properties of the periodic signal are assumed, the method is expected to b…