Search Publications
Symbiotic stars in X-rays: IV. XMM-Newton, Swift, and TESS observations
Nuñez, N. E.; Mukai, K.; Sokoloski, J. L. +7 more
White dwarf symbiotic binaries are detected in X-rays with luminosities in the range of 1030–1034 ergs s‑1. Their X-ray emission arises either from the accretion disk boundary layer, from a region where the winds from both components collide, or from nuclear burning on the surface of the white dwarf (WD). In our co…
The GAPS Programme at TNG. LI. Investigating the correlations between transiting system parameters and host chromospheric activity
Scandariato, G.; Pagano, I.; Fossati, L. +28 more
Context. Stellar activity is the most relevant types of astrophysical noise that affect the discovery and characterization of extrasolar planets. On the other hand, the amplitude of stellar activity could hint at an interaction between the star and a close-in giant planet. Progress has been made in recent years in understanding how to deal with st…
Surveys of clumps, cores, and condensations in Cygnus-X. Searching for circumstellar disks
Qiu, Keping; Cao, Yue; Yang, Kai +2 more
Context. Theories and models have suggested that circumstellar disks could channel material to the central protostar, and resist star formation feedback. Our current knowledge of the picture and role of disks around massive protostars is unclear because the observational evidence of these circumstellar disks is limited.
Aims: To investigate w…
Testing the asteroseismic estimates of stellar radii with surface brightness-colour relations and Gaia DR3 parallaxes: Red giants and red clump stars
Valle, G.; Dell'Omodarme, M.; Prada Moroni, P. G. +1 more
Aims. We compared stellar radii derived from asteroseismic scaling relations with those estimated using two independent surface brightness-colour relations (SBCRs) combined with Gaia DR3 parallaxes. Methods. We cross-matched asteroseismic and astrometric data for over 6400 red giant branch (RGB) and red clump (RC) stars from the APO-K2 catalogue w…
Observational study of intermittent solar jets: p-mode modulation
Liu, Yang; Cao, Wenda; Schmieder, Brigitte +7 more
Aims: Recurring jets are observed in the solar atmosphere. They can erupt intermittently over a long period of time. By the observation of intermittent jets, we wish to understand what causes the characteristics of the periodic eruptions.
Methods: We report intermittent jets observed by the Goode Solar Telescope (GST) with the TiO Broadb…
Recovery of coronal dimmings
Veronig, A. M.; Podladchikova, T.; Chikunova, G. +2 more
Context. Coronal dimmings are regions of reduced emission in the lower corona observed in the wake of coronal mass ejections (CMEs), representing their footprints. Studying the lifetime evolution of coronal dimmings helps us to better understand the recovery and replenishment of the corona after large-scale eruptions. Aims. We study the recovery o…
Measuring the intracluster medium velocity structure within the A3266 galaxy cluster
Pinto, C.; Eckert, D.; Gatuzz, E. +7 more
We present a detailed analysis of the velocity structure of the hot intracluster medium (ICM) within the A3266 galaxy cluster, including new observations taken between June and November 2023. Firstly, morphological structures within the galaxy cluster were examined using a Gaussian gradient magnitude (GGM) and an adaptively smoothed GGM filter app…
Early photometric and spectroscopic observations of the extraordinarily bright INTEGRAL-detected GRB 221009A
Sánchez-Ramírez, R.; Pandey, S. B.; Castro-Tirado, A. J. +46 more
Context. GRB 221009A, initially detected as an X-ray transient by Swift, was later revealed to have triggered the Fermi satellite about an hour earlier, marking it as a post-peak observation of the event's emission. This GRB distinguished itself as the brightest ever recorded, presenting an unparalleled opportunity to probe the complexities of GRB…
AXES-2MRS: A new all-sky catalogue of extended X-ray galaxy groups
Finoguenov, A.; Tempel, E.; Mamon, G. A. +1 more
Context. Understanding baryonic physics at the galaxy-group level is a prerequisite for cosmological studies of the large-scale structure. One poorly understood aspect of galaxy groups is related to the properties of their hot intragroup medium. The well-studied X-ray groups have strong cool cores by which they were selected, so expanding the sele…
The CARMENES search for exoplanets around M dwarfs: Magnesium and silicon abundances of K7–M5.5 stars
Amado, P. J.; Caballero, J. A.; Reiners, A. +13 more
We present the abundances of magnesium (Mg) and silicon (Si) for 314 dwarf stars with spectral types in the interval K7.0–M5.5 (Teff range ≈ 4200–3050 K) observed with the CARMENES high-resolution spectrograph at the 3.5 m telescope at the Calar Alto Observatory. Our analysis employs the BT-Settl model atmospheres, the radiative transfe…