Search Publications
Uncovering erosion effects on magnetic flux rope twist
Pal, Sanchita; Pomoell, Jens; Price, Daniel J. +2 more
Context. Magnetic clouds (MCs) are transient structures containing large-scale magnetic flux ropes from solar eruptions. The twist of magnetic field lines around the rope axis reveals information about flux rope formation processes and geoeffectivity. During propagation MC flux ropes may erode via reconnection with the ambient solar wind. Any eros…
Stellar Population Astrophysics (SPA) with TNG. Atmospheric parameters of members of 16 unstudied open clusters
Vallenari, A.; Bragaglia, A.; Spina, L. +12 more
Context. Thanks to the modern understanding of stellar evolution, we can accurately measure the ages of open clusters (OCs). Given their position, they are ideal tracers of the Galactic disc. Gaia data release 2, besides providing precise parallaxes, led to the detection of many new clusters, opening a new era for the study of the Galactic disc. H…
Solar origins of a strong stealth CME detected by Solar Orbiter
Long, David M.; Möstl, Christian; Davies, Emma E. +6 more
Aims: We aim to locate the origin of a stealth coronal mass ejection (CME) detected in situ by the MAG instrument on board Solar Orbiter and make connections between the CME observed at the Sun and the interplanetary CME (ICME) measured in situ.
Methods: Remote sensing data were analysed using advanced image processing techniques to iden…
A stringent upper limit of 20 pptv for methane on Mars and constraints on its dispersion outside Gale crater
Daerden, F.; Forget, F.; Montmessin, F. +17 more
Context. Reports on the detection of methane in the Martian atmosphere have motivated numerous studies aiming to confirm or explain its presence on a planet where it might imply a biogenic or more likely a geophysical origin.
Aims: Our intent is to complement and improve on the previously reported detection attempts by the Atmospheric Chemist…
APOGEE spectroscopic evidence for chemical anomalies in dwarf galaxies: The case of M 54 and Sagittarius
Bizyaev, Dmitry; Beers, Timothy C.; Minniti, Dante +7 more
We present evidence for globular cluster stellar debris in a dwarf galaxy system (Sagittarius; Sgr) based on an analysis of high-resolution H-band spectra from the Apache Point Observatory Galactic Evolution Experiment (APOGEE) survey. We add [N/Fe], [Ti/Fe], and [Ni/Fe] abundance ratios to the existing sample of potential members of M 54; this is…
The bright end of the infrared luminosity functions and the abundance of hyperluminous infrared galaxies
Bondi, M.; Prandoni, I.; Małek, K. +20 more
Aims: We provide the most accurate estimate yet of the bright end of the infrared (IR) luminosity functions (LFs) and the abundance of hyperluminous IR galaxies (HLIRGs) with IR luminosities >1013L⊙, thanks to the combination of the high sensitivity, angular resolution, and large area of the LOFAR Deep Fields, which p…
The CARMENES search for exoplanets around M dwarfs. Two terrestrial planets orbiting G 264-012 and one terrestrial planet orbiting Gl 393
Bouchy, F.; Amado, P. J.; Bauer, F. F. +52 more
We report the discovery of two planetary systems, namely G 264-012, an M 4.0 dwarf with two terrestrial planets (Mb sin i=2.50−0.30+0.29 M⊕ and Mc sin i=3.75−0.47+0.48 M⊕), and Gl 393, a bright M 2.0 dwarf with one terrestrial planet (Mb sini = 1.71 …
A strong lensing model of the galaxy cluster PSZ1 G311.65-18.48
Brammer, G.; Grillo, C.; Tozzi, P. +10 more
We present a strong lensing analysis of the galaxy cluster PSZ1 G311.65-18.48 (z = 0.443) using multi-band observations with Hubble Space Telescope complemented with VLT/MUSE spectroscopic data. The MUSE observations provide redshift estimates for the lensed sources and help to reduce misidentification of the multiple images. Spectroscopic data ar…
The unusual widespread solar energetic particle event on 2013 August 19. Solar origin and particle longitudinal distribution
Williams, D.; Jian, L. K.; Rodríguez-Pacheco, J. +11 more
Context. Late on 2013 August 19, STEREO-A, STEREO-B, MESSENGER, Mars Odyssey, and the L1 spacecraft, spanning a longitudinal range of 222° in the ecliptic plane, observed an energetic particle flux increase. The widespread solar energetic particle (SEP) event was associated with a coronal mass ejection (CME) that came from a region located near th…
New mass-loss rates of B supergiants from global wind models
Krtička, J.; Kubát, J.; Krtičková, I.
Massive stars lose a significant fraction of mass during their evolution. However, the corresponding mass-loss rates are rather uncertain, especially for evolved stars. To improve this, we calculated global line-driven wind models for Galactic B supergiants. Our models predict radial wind structure and particularly the mass-loss rates and terminal…