Search Publications
Investigating episodic mass loss in evolved massive stars: II. Physical properties of red supergiants at subsolar metallicity
Zapartas, E.; Munoz-Sanchez, G.; de Wit, S. +8 more
Mass loss during the red supergiant (RSG) phase plays a crucial role in the evolution of an intermediate-mass star; however, the underlying mechanism remains unknown. We aim to increase the sample of well-characterized RSGs at subsolar metallicity by deriving the physical properties of 127 RSGs in nine nearby southern galaxies. For each RSG, we pr…
JWST/NIRSpec and MIRI observations of an expanding, jet-driven bubble of warm H2 in the radio galaxy 3C 326 N
Petrov, R.; Nesvadba, N. P. H.; Mukherjee, D. +5 more
The physical link between AGN activity and the suppression of star formation in their host galaxies is one of the major open questions of the AGN feedback scenario. The Spitzer space mission revealed a subset of powerful nearby radio galaxies with unusually bright line emission from warm (T ≥ 100 K) molecular hydrogen, while typical star-formation…
MALS discovery of a rare H I 21 cm absorber at z ∼ 1.35: Origin of the absorbing gas in powerful active galactic nuclei
Momjian, E.; Combes, F.; Petitjean, P. +14 more
We report a new, rare detection of H I 21 cm absorption associated with a quasar (only six quasars are known at 1 < z < 2) toward J2339−5523 at zem = 1.3531, discovered through the MeerKAT Absorption Line Survey (MALS). The absorption profile is broad (∼400 km s−1 ), and the peak is redshifted by ∼200 km s−1 …
A New Enigmatic Radio Relic in the Low-mass Cluster Abell 2108
Kale, Ruta; Rahaman, Majidul; Datta, Abhirup +2 more
We report the discovery of a radio relic in the north-eastern periphery of the galaxy cluster Abell 2108 (A2108). A2108 is part of the uGMRT LOw-MAss Galaxy Cluster Survey (GLOMACS), where our main aim is to search for diffuse radio emission signatures in very sparsely explored low-mass galaxy clusters using uGMRT band-3 (central frequency 400 MHz…
TOI 762 A b and TIC 46432937 b: Two Giant Planets Transiting M-dwarf Stars
Triaud, Amaury H. M. J.; Jordán, Andrés; Brahm, Rafael +33 more
We present the discovery of TOI 762 A b and TIC 46432937 b, two giant planets transiting M-dwarf stars. Transits of both systems were first detected from observations by the NASA TESS mission, and the transiting objects are confirmed as planets through high-precision radial velocity observations carried out with Very Large Telescope/ESPRESSO. TOI …
Gaia search for (sub)stellar companions of exoplanet hosts
Mugrauer, Markus; Michel, Kai-Uwe
We conduct a survey, which explores the data releases of the European Space Agency (ESA)-Gaia mission, in order to investigate the multiplicity of exoplanet hosts at distances of less than 625 pc around the Sun. With the accurate Gaia astrometry we are able to detect stellar and substellar companions of exoplanet hosts by proving the equidistance …
The VMC survey. L. Type II Cepheids in the Magellanic Clouds: Period-luminosity relations in the near-infrared bands
Ripepi, V.; Molinaro, R.; Marconi, M. +8 more
Context. Type II Cepheids (T2Cs) are the less frequently used counterparts of classical or type I Cepheids (CCs) which provide the primary calibration of the distance ladder for measuring the Hubble constant in the local Universe. In the era of the "Hubble tension", T2C variables together with the RR Lyrae stars and the tip of the red giant branch…
Cliff collapse on Comet 67P/Churyumov-Gerasimenko - I. Aswan
Davidsson, Björn J. R.
The Aswan cliff on Comet 67P/Churyumov-Gerasimenko collapsed on 2015 July 10. Thereby, relatively pristine comet material from a depth of $\sim 12\, \mathrm{m}$ was exposed at the surface. Observations of the collapse site by the microwave instrument Rosetta/Microwave Instrument for Rosetta Orbiter (MIRO) have been retrieved from 8 months prior to…
Observational chemical signatures of the past FU Ori outbursts
Ábrahám, Péter; Kóspál, Ágnes; Smirnov-Pinchukov, Grigorii V. +4 more
FU Ori-type stars (FUors) are young stellar objects (YSOs) experiencing luminosity outbursts by a few orders of magnitude, which last for ~102 yr. A dozen of FUors are known up to date, but many more currently quiescent YSOs could have experienced such outbursts in the last ~103 yr. To find observational signatures of possibl…
A slightly oblate dark matter halo revealed by a retrograde precessing Galactic disk warp
Huang, Yang; Liu, Jifeng; Beers, Timothy C. +7 more
The shape of the dark matter (DM) halo is key to understanding the hierarchical formation of the Galaxy. Despite extensive efforts in recent decades, however, its shape remains a matter of debate, with suggestions ranging from strongly oblate to prolate. Here, we present a new constraint on its present shape by directly measuring the evolution of …