Search Publications
TOI-2458 b: A mini-Neptune consistent with in situ hot Jupiter formation
Bieryla, Allyson; Latham, David W.; Cochran, William D. +33 more
We report on the discovery and spectroscopic confirmation of TOI-2458 b, a transiting mini-Neptune around an F-type star leaving the main-sequence with a mass of M★ = 1.05 ± 0.03 M⊙, a radius of R★ = 1.31 ± 0.03 R⊙, an effective temperature of Teff = 6005 ± 50 K, and a metallicity of ‑0.10 ± 0…
The elderly among the oldest: new evidence for extremely metal-poor RR Lyrae stars
Marconi, M.; Fabrizio, M.; D'Orazi, V. +21 more
We performed a detailed spectroscopic analysis of three extremely metal-poor RR Lyrae stars, exploring uncharted territories at these low metallicities for this class of stars. Using high-resolution spectra acquired with HARPS-N at TNG, UVES at VLT, and PEPSI at LBT, and employing Non-Local Thermodynamic Equilibrium (NLTE) spectral synthesis calcu…
Exploring the disc-jet scenario in 3C 273 using simultaneous XMM-Newton and NuSTAR observations
Wiita, Paul J.; Pandey, Ashwani; Mondal, Santanu
Context. The well-studied active galactic nucleus (AGN) 3C 273 displays characteristics of both jetted-AGNs and Seyfert galaxies, which makes it an excellent source to study the disc-jet connection in AGNs. Aims. We aim to investigate the disc-jet scenario in 3C 273 using broad-band (0.3–78 keV) X-ray spectra from XMM-Newton and NuSTAR. Methods. W…
Dynamic and radiative implications of jet–star interactions in AGN jets
Kovalev, Y. Y.; Fichet de Clairfontaine, G.; Perucho, M. +1 more
Context. The interactions between jets from active galactic nuclei (AGN) and their stellar environments significantly influence jet dynamics and emission characteristics. In low-power jets, such as those in Fanaroff-Riley I (FR I) galaxies, the jet–star interactions can notably affect jet deceleration and energy dissipation. Aims. Recent numerical…
Gaia20bdk – New FU Ori-type star in the Sh 2-301 star-forming region
Gromadzki, M.; Cseh, B.; Kriskovics, L. +28 more
Context. We analyse multi-colour photometric and spectroscopic observations of the young stellar object (YSO) Gaia20bdk. Aims. We aim to investigate the exact nature of the eruptive phenomenon that the star has been undergoing since 2018. Methods. We used public-domain archival photometry to characterise the quiescent phase and to establish the ma…
Tidal tails of nearby open clusters: I. Mapping with Gaia DR3
Risbud, Dhanraj; Jadhav, Vikrant V.; Kroupa, Pavel
Context. Tidal tails of open clusters are the result of stellar evaporation from the cluster through the Galactic potential and internal dynamics. With the recent availability of high-precision data, tidal tails are being detected for most of the nearby open clusters. Aims. We identify the tidal tail members for all open clusters within a distance…
Correlation of long-term optical color variability of radio-loud quasars with their VLBI astrometric characteristics
Makarov, V. V.; Lambert, S.; Medouni, A. +1 more
Aims. The International Celestial Reference Frame (ICRF) is realized through geodetic very long baseline interferometry (VLBI) positions of thousands of extragalactic objects, mainly radio-loud active galactic nuclei. As previous studies have suggested a link between the optical variability of these sources and optical-radio position offsets and v…
A multi-technique detection of an eccentric giant planet around the accelerating star HD 57625
Ertel, S.; Henning, Th.; Sozzetti, A. +42 more
Context. The synergy between different detection methods is a key asset in exoplanetology that allows the precise characterization of detected exoplanets and robust constraints even in the case of a non-detection. The interplay between imaging, radial velocities and astrometry has recently produced significant advancements in exoplanetary science.…
Best of both worlds: Fusing hyperspectral data from two generations of spectro-imagers for X-ray astrophysics
Bobin, J.; Acero, F.; Lascar, J.
Context. With the recent launch of the X-Ray Imaging and Spectroscopy Mission (XRISM) and the advent of microcalorimeter detectors, X-ray astrophysics is entering in a new era of spatially resolved high-resolution spectroscopy. But while this new generation of X-ray telescopes offers much finer spectral resolution than the previous one (e.g. XMM-N…
Kalkayotl 2.0: Bayesian phase-space modelling of star-forming regions, stellar associations, and open clusters
Bouy, H.; Berihuete, A.; Olivares, J. +1 more
Context. Star-forming regions, stellar associations, and open clusters are fundamental stellar systems where predictions from star-formation theories can be robustly contrasted with observations. Aims. We aim to provide the astrophysical community with a free and open-source code to infer the phase-space (i.e. positions and velocities) parameters …