Search Publications
Unusually high magnetic fields in the coma of 67P/Churyumov-Gerasimenko during its high-activity phase
Tsurutani, B. T.; Behar, E.; Nilsson, H. +10 more
Aims: On July 3, 2015, an unprecedented increase in the magnetic field magnitude was measured by the Rosetta spacecraft orbiting comet 67P/Churyumov-Gerasimenko (67P). This increase was accompanied by large variations in magnetic field and ion and electron density and energy. To our knowledge, this unusual event marks the highest magnetic fie…
Flow pattern of accelerated cometary ions inside and outside the diamagnetic cavity of comet 67P/Churyumov-Gerasimenko
Behar, E.; Nilsson, H.; Goetz, C. +3 more
Analyzing data from the Ion Composition Analyzer on board the Rosetta spacecraft, we studied a flow pattern of accelerated cometary ions (40-80 eV) inside and outside the diamagnetic cavity of comet 67P/Churyumov-Gerasimenko (67P). We found that the accelerated ions are intermittently observed and are ten times more frequently observed outside the…
IRAM and Gaia views of multi-episodic star formation in IC 1396A. The origin and dynamics of the Class 0 protostar at the edge of an HII region
Fang, Min; Sicilia-Aguilar, Aurora; Roccatagliata, Veronica +3 more
Context. IC 1396A is a cometary globule that contains the Class 0 source IC 1396A-PACS-1, which was discovered with Herschel.
Aims: We use IRAM 30m telescope and Gaia DR2 data to explore the star formation history of IC 1396A and investigate the possibilities of triggered star formation.
Methods: IRAM and Herschel continuum data were use…
IC 4665 DANCe. I. Members, empirical isochrones, magnitude distributions, present-day system mass function, and spatial distribution
Tamura, M.; Bertin, E.; Miret-Roig, N. +12 more
Context. The study of star formation is extremely challenging, due to the lack of complete and clean samples of young nearby clusters and star-forming regions. The recent Gaia DR2 catalogue complemented with the deep ground-based COSMIC DANCe catalogue offers a new database of unprecedented accuracy to revisit the membership of clusters and star-f…
Star-forming galaxies at low-redshift in the SHARDS survey
Mas-Hesse, J. M.; Hernán-Caballero, A.; Koekemoer, A. M. +13 more
Context. The physical processes driving the evolution of star formation (SF) in galaxies over cosmic time still present many open questions. Recent galaxy surveys allow now to study these processes in great detail at intermediate redshift (0 ≤ z ≤ 0.5).
Aims: We build a complete sample of star-forming galaxies and analyze their properties, re…
LMC S154: the first Magellanic symbiotic recurrent nova
Gromadzki, Mariusz; Miszalski, Brent; Iłkiewicz, Krystian +3 more
Classical nova outburst has been suggested for a number of extragalactic symbiotic stars, but in none of the systems has it been proven. In this work we study the nature of one of these systems, LMC S154. We gathered archival photometric observations in order to determine the timescales and nature of variability in this system. Additionally we car…
Orbital and physical parameters of eclipsing binaries from the All-Sky Automated Survey catalogue. X. Three high-contrast systems with secondaries detected with IR spectroscopy
Tamura, M.; Kambe, E.; Niemczura, E. +14 more
Aims: We present results of the combined photometric and spectroscopic analysis of three detached eclipsing binaries, the secondary components of which are not visible or are very hard to identify in the optical spectra - ASAS J052743-0359.7, ASAS J065134-2211.5, and ASAS J073507-0905.7. The first one is the known visual binary ADS 4022, and …
Photometry of K2 Campaign 9 bulge data
Udalski, A.; Poleski, R.; Gould, A. +4 more
In its Campaign 9, K2 observed dense regions toward the Galactic bulge in order to constrain the microlensing parallaxes and probe for free-floating planets. Photometric reduction of the K2 bulge data poses a significant challenge due to a combination of the very high stellar density, large pixels of the Kepler camera, and the pointing drift of th…
A VLT/FLAMES survey for massive binaries in Westerlund 1. V. The X-ray selected blue stragglers Wd1-27 and -30a
Negueruela, I.; Najarro, F.; Clark, J. S. +3 more
Context. Recent observational studies indicate that a large number of OB stars are found within binary systems which may be expected to interact during their lifetimes. Significant mass transfer or indeed merger of both components is expected to modify evolutionary pathways, facilitating the production of exceptionally massive stars which will pre…
Full inversion of solar relativistic electron events measured by the Helios spacecraft
Lario, D.; Heber, B.; Aran, A. +2 more
Context. The Parker Solar Probe and the incoming Solar Orbiter mission will provide measurements of solar energetic particle (SEP) events at close heliocentric distances from the Sun. Up to present, the largest data set of SEP events in the inner heliosphere are the observations by the two Helios spacecraft.
Aims: We re-visit a sample of 15 s…