Search Publications
DeGaS-MC: Dense Gas Survey in the Magellanic Clouds. I. An APEX survey of HCO+ and HCN(2-1) toward the LMC and SMC
Immer, K.; Lebouteiller, V.; Madden, S. C. +9 more
Context. Understanding the star-forming processes is key to understanding the evolution of galaxies. Investigating star formation requires precise knowledge of the properties of the dense molecular gas complexes where stars form and a quantification of how they are affected by the physical conditions to which they are exposed. The proximity, low m…
Searching for the near-infrared counterpart of Proxima c using multi-epoch high-contrast SPHERE data at VLT
Ménard, F.; Henning, T.; Brandner, W. +43 more
Context. Proxima Centauri is the closest star to the Sun and it is known to host an Earth-like planet in its habitable zone; very recently a second candidate planet was proposed based on radial velocities. At quadrature, the expected projected separation of this new candidate is larger than 1 arcsec, making it a potentially interesting target for …
Three-dimensional reconstruction of multiple particle acceleration regions during a coronal mass ejection
Palmerio, E.; Vainio, R.; Kilpua, E. K. J. +3 more
Context. Some of the most prominent sources for particle acceleration in our Solar System are large eruptions of magnetised plasma from the Sun called coronal mass ejections (CMEs). These accelerated particles can generate radio emission through various mechanisms.
Aims: CMEs are often accompanied by a variety of solar radio bursts with diffe…
The various accretion modes of AM Herculis: Clues from multi-wavelength observations in high accretion states
Sablowski, D.; Schwope, A. D.; Traulsen, I. +1 more
We report on XMM-Newton and NuSTAR X-ray observations of the prototypical polar, AM Herculis, supported by ground-based photometry and spectroscopy, all obtained in high accretion states. In 2005, AM Herculis was in its regular mode of accretion, showing a self-eclipse of the main accreting pole. X-ray emission during the self-eclipse was assigned…
Emergence of small-scale magnetic flux in the quiet Sun
Gontikakis, C.; Tziotziou, K.; Tsiropoula, G. +4 more
Context. We study the evolution of a small-scale emerging flux region (EFR) in the quiet Sun, from its emergence in the photosphere to its appearance in the corona and its decay.
Aims: We track processes and phenomena that take place across all atmospheric layers; we explore their interrelations and compare our findings with those from recent…
Hierarchical star formation in nearby galaxies
Baume, G.; Rodríguez, M. J.; Feinstein, C.
Aims: The purpose of this work is to study the properties of the spatial distribution of the young population in three nearby galaxies in order to better understand the first stages of star formation.
Methods: We used ACS/HST photometry and the "path-linkage criterion" in order to obtain a catalog of young stellar groups (YSGs) in the ga…
The long-term enhanced brightness of the magnetar 1E 1547.0-5408
Enoto, Teruaki; Esposito, Paolo; Rea, Nanda +6 more
We present the evolution of the X-ray emission properties of the magnetar 1E 1547.0-5408 since February 2004 over a time period covering three outbursts. We analyzed new and archival observations taken with the Swift, NuSTAR, Chandra, and XMM-Newton X-ray satellites. The source has been observed at a relatively steady soft X-ray flux of ≈10-1…
Distance and mass of the M 104 (Sombrero) group
Anand, Gagandeep S.; Shaya, Edward J.; Karachentsev, Igor D. +3 more
Aims: Distances and radial velocities of galaxies in the vicinity of the luminous early-type galaxy M 104 (Sombrero) are used to derive its dark matter mass.
Methods: Two dwarf galaxies: UGCA 307 and KKSG 30 situated near M 104 were observed with the Advanced Camera for Surveys on the Hubble Space Telescope. The distances 9.03-0.51<…
ALMA chemical survey of disk-outflow sources in Taurus (ALMA-DOT). III. The interplay between gas and dust in the protoplanetary disk of DG Tau
Podio, L.; Bacciotti, F.; Fedele, D. +9 more
Context. Planets form in protoplanetary disks and inherit their chemical composition. It is therefore crucial to understand the molecular content of protoplanetary disks in their gaseous and solid components.
Aims: We aim to characterize the distribution and abundance of molecules in the protoplanetary disk of DG Tau and to compare them with …
Expected performances of the Characterising Exoplanet Satellite (CHEOPS). I. Photometric performances from ground-based calibration
Queloz, D.; Benz, W.; Deline, A. +6 more
Context. The characterisation of Earth-size exoplanets through transit photometry has stimulated new generations of high-precision instruments. In that respect, the Characterising Exoplanet Satellite (CHEOPS) is designed to perform photometric observations of bright stars to obtain precise radii measurements of transiting planets. The CHEOPS instr…