Search Publications
The bright blue side of the night sky: Spectroscopic survey of bright and hot (pre-) white dwarfs
Kepler, S. O.; Uzundag, Murat; Pelisoli, Ingrid +10 more
We report on the spectroscopic confirmation of 68 new bright (G = 13.5-17.2 mag) and blue (pre-)white dwarfs (WDs). This finding has allowed us to almost double the number of the hottest (Teff ≥ 60 kK) known WDs brighter than G = 16 mag. We increased the number of known ultra-high excitation (UHE) WDs by 20%, found one unambiguous close…
A radio-jet-driven outflow in the Seyfert 2 galaxy NGC 2110?
Rigopoulou, D.; Hönig, S. F.; Villar-Martín, M. +16 more
We present a spatially resolved study of the ionized gas in the central 2 kpc of the Seyfert 2 galaxy NGC 2110 and investigate the role of its moderate-luminosity radio jet (kinetic radio power of Pjet = 2.3 × 1043 erg s−1). We used new optical integral-field observations taken with the MEGARA spectrograph at the G…
The young massive SMC cluster NGC 330 seen by MUSE. III. Stellar parameters and rotational velocities
Wang, C.; Dufton, P. L.; de Mink, S. E. +11 more
Context. The origin of the initial rotation rates of stars, and how a star's surface rotational velocity changes during the evolution, either by internal angular momentum transport or due to interactions with a binary companion, remain open questions in stellar astrophysics.
Aims: Here, we aim to derive the physical parameters and study the d…
Hydrogen column density variability in a sample of local Compton-thin AGN
Ajello, M.; Marchesi, S.; Torres-Albà, N. +5 more
We present the analysis of multiepoch observations of a set of 12 variable, Compton-thin, local (z < 0.1) active galactic nuclei (AGN) selected from the 100-month BAT catalog. We analyzed all available X-ray data from Chandra, XMM-Newton, and NuSTAR, adding up to a total of 53 individual observations. This corresponds to between three and seven…
Photometric variability of the LAMOST sample of magnetic chemically peculiar stars as seen by TESS
Paunzen, E.; Shultz, M. E.; Bernhard, K. +2 more
Context. High-quality light curves from space-based missions have opened up a new window on the rotational and pulsational properties of magnetic chemically peculiar (mCP) stars and have fuelled asteroseismic studies. They allow the internal effects of surface magnetic fields to be probed and numerous astrophysical parameters to be derived with gr…
Evolution of the Lyman-α-emitting fraction and UV properties of lensed star-forming galaxies in the range 2.9 < z < 6.7
Richard, J.; Pello, R.; Tuan-Anh, P. +6 more
Context. Faint galaxies are theorised to have played a major role, perhaps the dominant role, in reionising the Universe. Their properties, as well as the Lyman-α emitter (LAE) fraction, XLAE, could provide useful insights into this epoch.
Aims: We used four clusters of galaxies from the Lensed Lyman-alpha MUSE Arcs Sample (LLAMAS)…
Forbidden hugs in pandemic times. IV. Panchromatic evolution of three luminous red novae
Fugazza, D.; Lundqvist, P.; Reichart, D. E. +77 more
We present photometric and spectroscopic data on three extragalactic luminous red novae (LRNe):
The high-albedo, low polarization disk around HD 114082 that harbors a Jupiter-sized transiting planet. Constraints from VLT/SPHERE completed with TESS, Gaia, and radial velocities
Ménard, F.; Marshall, J. P.; del Burgo, C. +36 more
Aims: We present new optical and near-infrared images of the debris disk around the F-type star HD 114082 in the Scorpius-Centaurus OB association. We obtained direct imaging observations and analyzed the TESS photometric time series data of this target with the goal of searching for planetary companions to HD 114082 and characterizing the mo…
Detection of open cluster rotation fields from Gaia EDR3 proper motions
Krone-Martins, A.; Moitinho, A.; Guilherme-Garcia, P.
Context. Most stars from in groups which with time disperse, building the field population of their host galaxy. In the Milky Way, open clusters have been continuously forming in the disk up to the present time, providing it with stars spanning a broad range of ages and masses. Observations of the details of cluster dissolution are, however, scarc…
Identifying the energy release site in a solar microflare with a jet
Monstein, Christian; Krucker, Säm; Veronig, Astrid M. +10 more
Context. One of the main science questions of the Solar Orbiter and Parker Solar Probe missions deals with understanding how electrons in the lower solar corona are accelerated and how they subsequently access interplanetary space.
Aims: We aim to investigate the electron acceleration and energy release sites as well as the manner in which ac…