Search Publications
Imaging detection of the inner dust belt and the four exoplanets in the HR 8799 system with JWST's MIRI coronagraph
Henning, Thomas; Güdel, Manuel; Colina, Luis +35 more
Context. The MIRI instrument on board JWST is now offering high-contrast imaging capacity at mid-IR wavelengths, thereby opening a completely new field of investigation for characterizing young exoplanetary systems.
Aims: The multiplanet system HR 8799 is the first target observed with MIRI's coronagraph as part of the MIRI-EC Guaranteed Time…
Establishing a mass-loss rate relation for red supergiants in the Large Magellanic Cloud
Zapartas, E.; Munoz-Sanchez, G.; de Wit, S. +3 more
Context. The high mass-loss rates of red supergiants (RSGs) drastically affect their evolution and final fate, but their mass-loss mechanism remains poorly understood. Various empirical prescriptions scaled with luminosity have been derived in the literature, yielding results with a dispersion of two to three orders of magnitude.
Aims: We det…
The accretion burst of the massive young stellar object G323.46−0.08
Matter, A.; Eislöffel, J.; Stecklum, B. +10 more
Context. Accretion bursts from low-mass young stellar objects (YSOs) have been known for many decades. In recent years, the first accretion bursts of massive YSOs (MYSOs) have been observed. These phases of intense protostellar growth are of particular importance for studying massive star formation. Bursts of MYSOs are accompanied by flares of Cla…
Gaia FGK benchmark stars: Fundamental Teff and log g of the third version
Casamiquela, L.; Creevey, O. L.; Soubiran, C. +8 more
Context. Large spectroscopic surveys devoted to the study of the Milky Way, including Gaia, use automated pipelines to determine the atmospheric parameters of millions of stars. The Gaia FGK benchmark stars are reference stars with Teff and log 𝑔 derived through fundamental relations, independently of spectroscopy, to be used as anchors…
Effects of galaxy environment on merger fraction
White, G. J.; Małek, K.; Serjeant, S. +13 more
Aims: In this work we examine how environment influences the merger fraction, from the low density field environment to higher density groups and clusters. We also study how the properties of a group or cluster, as well as the position of a galaxy in the group or cluster, influences the merger fraction.
Methods: We identified galaxy grou…
Chemical abundances and deviations from the solar S/O ratio in the gas-phase interstellar medium of galaxies based on infrared emission lines
Pérez-Díaz, Borja; Pérez-Montero, Enrique; Fernández-Ontiveros, Juan A. +3 more
Context. The infrared (IR) range is extremely useful in the context of chemical abundance studies of the gas-phase interstellar medium (ISM) due to the large variety of ionic species traced in this regime, the negligible effects from dust attenuation or temperature stratification, and the amount of data that has been and will be released in the co…
eROSITA studies of the Carina nebula
Sasaki, Manami; Pühlhofer, Gerd; Tsuge, Kisetsu +4 more
Context. During the first four all-sky surveys eRASS:4, which was carried out from December 2019 to 2021, the extended Roentgen Survey with an Imaging Telescope Array (eROSITA) on board the Spektrum-Roentgen-Gamma (Spektr-RG, SRG) observed the Galactic H II region, the Carina nebula.
Aims: We analysed the eRASS:4 data to study the distributio…
Revisiting the dynamical masses of the transiting planets in the young AU Mic system: Potential AU Mic b inflation at 20 Myr
Aigrain, S.; Nagel, E.; Amado, P. J. +26 more
Context. Understanding planet formation is important in the context of the origin of planetary systems in general and of the Solar System in particular, as well as to predict the likelihood of finding Jupiter, Neptune, and Earth analogues around other stars. Aims. We aim to precisely determine the radii and dynamical masses of transiting planets o…
UOCS. XIV. Uncovering extremely low-mass white dwarfs and blue lurkers in NGC 752
Jadhav, Vikrant V.; Subramaniam, Annapurni; Sagar, Ram
Context. Evolutionary pathways of binary systems are vastly different from single stellar evolution, and thus there is a need to quantify their frequency and diversity. Thanks to their to their coeval nature, open clusters are the best test beds for unveiling the secrets of binary populations. The availability of multi-wavelength data in recent ye…
The enigma of Gaia18cjb: A possible rare hybrid of FUor and EXor properties
Pál, András; Ogłoza, Waldemar; Ábrahám, Péter +28 more
Context. Gaia18cjb is one of the Gaia-alerted eruptive young star candidates that has been experiencing a slow and strong brightening during the last 13 years, similarly to some FU Orionis-type objects.
Aims: The aim of this work is to derive the young stellar nature of Gaia18cjb and determine its physical and accretion properties to classify…