Search Publications
Observations of solar small-scale magnetic flux-sheet emergence
Bello González, N.; Borrero, J. M.; Fischer, C. E. +1 more
Aims: Two types of flux emergence were recently discovered in numerical simulations: magnetic loops and magnetic sheet emergence. While magnetic loop emergence has been documented well in recent years using high-resolution full Stokes data from ground-based telescopes as well as satellites, magnetic sheet emergence is still an understudied pr…
The CEMP star SDSS J0222-0313: the first evidence of proton ingestion in very low-metallicity AGB stars?
Salvadori, S.; Bonifacio, P.; Caffau, E. +9 more
Context. Carbon-enhanced metal-poor (CEMP) stars are common objects in the metal-poor regime. The lower the metallicity we look at, the larger the fraction of CEMP stars with respect to metal-poor stars with no enhancement in carbon. The chemical pattern of CEMP stars is diversified, strongly suggesting a different origin of the C enhancement in t…
Searching for g modes. II. Unconfirmed g-mode detection in the power spectrum of the time series of round-trip travel time
Corbard, T.; Appourchaux, T.
Context. The recent claims of g-mode detection have restarted the search for these potentially extremely important modes. The claimed detection of g modes was obtained from the analysis of the power spectrum of the time series of round-trip travel time of p modes.
Aims: The goal of this paper is to reproduce these results on which the claims …
Peering at the outflow mechanisms in the transitional pulsar PSR J1023+0038: simultaneous VLT, XMM-Newton, and Swift high-time resolution observations
D'Avanzo, P.; Campana, S.; Casella, P. +6 more
We report on a simultaneous near-infrared, optical, and X-ray campaign performed in 2017 with the XMM-Newton and Swift satellites and the HAWK-I instrument mounted on the Very Large Telescope (VLT) on the transitional millisecond pulsar PSR J1023+0038. Near-infrared observations were performed in fast-photometric mode (0.5 s exposure time) in orde…
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…