Search Publications
Properties of luminous red supergiant stars in the Magellanic Clouds
Boutsia, K.; Zapartas, E.; de Wit, S. +5 more
Context. There is evidence that some red supergiants (RSGs) experience short-lived phases of extreme mass loss, producing copious amounts of dust. These episodic outburst phases help strip the hydrogen envelope from evolved massive stars, drastically affecting their evolution. However, to date, the observational data of episodic mass loss is limit…
GJ 806 (TOI-4481): A bright nearby multi-planetary system with a transiting hot low-density super-Earth
Amado, P. J.; Caballero, J. A.; Reiners, A. +63 more
One of the main scientific goals of the TESS mission is the discovery of transiting small planets around the closest and brightest stars in the sky. Here, using data from the CARMENES, MAROON-X, and HIRES spectrographs together with TESS, we report the discovery and mass determination of aplanetary system around the M1.5 V star GJ 806 (TOI-4481). …
Large Interferometer For Exoplanets (LIFE). X. Detectability of currently known exoplanets and synergies with future IR/O/UV reflected-starlight imaging missions
Beichman, Charles A.; García Muñoz, Antonio; Stapelfeldt, Karl R. +10 more
Context. The next generation of space-based observatories will characterize the atmospheres of low-mass, temperate exoplanets with the direct-imaging technique. This will be a major step forward in our understanding of exoplanet diversity and the prevalence of potentially habitable conditions beyond the Earth.
Aims: We compute a list of curre…
Multi-probe analysis of the galaxy cluster CL J1226.9+3332. Hydrostatic mass and hydrostatic-to-lensing bias
Berta, S.; Aussel, H.; Adam, R. +50 more
The precise estimation of the mass of galaxy clusters is a major issue for cosmology. Large galaxy cluster surveys rely on scaling laws that relate cluster observables to their masses. From the high-resolution observations of ∼45 galaxy clusters with the NIKA2 and XMM-Newton instruments, the NIKA2 Sunyaev-Zel'dovich Large Program should provide an…
M giants with IGRINS. I. Stellar parameters and α-abundance trends of the solar neighborhood population
Ryde, N.; Casagrande, L.; Nandakumar, G. +1 more
Context. Cool stars, such as M giants, can only be analyzed in the near-infrared (NIR) regime due to the ubiquitous titanium oxide features in optical spectra of stars with Teff < 4000 K. In dust-obscured regions, the inner bulge and Galactic center region, the intrinsically bright M giants observed in the NIR are an optimal option f…
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…