Search Publications
[C II] 158 µm line emission from Orion A I. A template for extragalactic studies?
Wolfire, M. G.; Teyssier, D.; Goicoechea, J. R. +10 more
Context. The [C II] 158 µm fine-structure line is one of the dominant coolants of the neutral interstellar medium. It is hence one of the brightest far-infrared (FIR) emission lines and can be observed not only in star-forming regions throughout the Galaxy, but also in the diffuse interstellar medium and in distant galaxies. [C II] line emis…
Spectro-imagery of an active tornado-like prominence: Formation and evolution
Barczynski, Krzysztof; Schmieder, Brigitte; Labrosse, Nicolas +3 more
Context. The dynamical nature of fine structures in prominences remains an open issue, including rotating flows in tornado prominences. While the Atmospheric Imaging Assembly imager aboard the Solar Dynamics Observatory allowed us to follow the global structure of a tornado-like prominence for five hours, the Interface Region Imaging Spectrograph,…
Modelling rebrightenings, reflares, and echoes in dwarf nova outbursts
Hameury, J. -M.; Lasota, J. -P.
Context. The disc instability model (DIM) accounts well for most of the observed properties of dwarf novae and soft X-ray transients, but the rebrightenings, reflares, and echoes occurring at the end of outbursts or shortly after in WZ Sge stars or soft X-ray transients have not yet been convincingly explained by any model.
Aims: We determine…
Mapping the "invisible" circumgalactic medium around a z ∼ 4.5 radio galaxy with MUSE
Lehnert, Matthew D.; De Breuck, Carlos; Wylezalek, Dominika +5 more
In this paper we present Multi Unit Spectroscopic Explorer integral field unit spectroscopic observations of the ∼70 × 30 kpc2 Lyα halo around the radio galaxy
Investigating point sources in MWC 758 with SPHERE
Ménard, F.; Pantin, E.; Ginski, C. +26 more
Context. Spiral arms in protoplanetary disks could be shown to be the manifestation of density waves launched by protoplanets and propagating in the gaseous component of the disk. At least two point sources have been identified in the L band in the MWC 758 system as planetary mass object candidates.
Aims: We used VLT/SPHERE to search for coun…
Brown dwarfs as ideal candidates for detecting UV aurora outside the Solar System: Hubble Space Telescope observations of 2MASS J1237+6526
Saur, Joachim; Youngblood, Allison; Roth, Lorenz +5 more
Context. Observations of auroral emissions are powerful means to remotely sense the space plasma environment around planetary bodies and ultracool dwarfs. Therefore successful searches and characterization of aurorae outside the Solar System will open new avenues in the area of extrasolar space physics.
Aims: We aim to demonstrate that brown …
Resolving the dynamical mass tension of the massive binary 9 Sagittarii
Sana, H.; Hawcroft, C.; Mahy, L. +4 more
Context. Direct dynamical mass measurements of stars with masses above 30 M⊙ are rare. This is the result of the low yield of the upper initial mass function and the limited number of such systems in eclipsing binaries. Long-period, double-lined spectroscopic binaries that are also resolved astrometrically offer an alternative to eclips…
Magnetic reconnection as a mechanism to produce multiple thermal proton populations and beams locally in the solar wind
André, N.; Fedorov, A.; Livi, S. +37 more
Context. Spacecraft data revealed early on the frequent observation of multiple near-thermal proton populations in the solar wind. Decades of research on their origin have focused on processes such as magnetic reconnection in the low corona and wave-particle interactions in the corona and locally in the solar wind.
Aims: This study aims to hi…
NGC 1261: An r-process enhanced globular cluster from the Gaia-Enceladus event
McWilliam, Andrew; Koch-Hansen, Andreas J.; Hansen, Camilla J.
Our Milky Way (MW) has witnessed a series of major accretion events in the past. One of the later additions, the Gaia-Enceladus merger, has contributed a considerable mass to the inner Galaxy, but also generously donated to the outer halo. So far, associations with present-day MW globular clusters (GCs) have been chiefly based on their kinematics …
A revised cone model and its application to non-radial prominence eruptions
Zhang, Q. M.
Context. The traditional cone models achieve great success in studying the geometrical and kinematic properties of halo coronal mass ejections (CMEs).
Aims: In this Letter, a revised cone model is proposed to investigate the properties of CMEs as a result of non-radial prominence eruptions.
Methods: The cone apex is located at the source…