Search Publications
The polarisation properties of the HD 181327 debris ring. Evidence for sub-micron particles from scattered light observations
Lasue, J.; Pinte, C.; Ménard, F. +26 more
Context. Polarisation is a powerful remote-sensing tool to study the nature of particles scattering the starlight. It is widely used to characterise interplanetary dust particles in the Solar System and increasingly employed to investigate extrasolar dust in debris discs' systems.
Aims: We aim to measure the scattering properties of the dust …
The CARMENES search for exoplanets around M dwarfs. Revisiting the GJ 581 multi-planetary system with new Doppler measurements from CARMENES, HARPS, and HIRES
Amado, P. J.; Caballero, J. A.; Reiners, A. +18 more
Context. GJ 581 is a nearby M dwarf known to host a packed multiple planet system composed of two super-Earths and a Neptune-mass planet. We present new orbital analyses of the GJ 581 system, utilizing recent radial velocity (RV) data obtained from the CARMENES spectrograph combined with newly reprocessed archival data from the HARPS and HIRES spe…
The giant outburst of EXO 2030+375. I. Spectral and pulse profile evolution
Wilms, J.; Pottschmidt, K.; Kretschmar, P. +12 more
The Be X-ray binary EXO 2030+375 went through its third recorded giant outburst from June 2021 to early 2022. We present the results of both spectral and timing analysis based on NICER monitoring, covering the 2−10 keV flux range from 20 to 310 mCrab. Dense monitoring with observations carried out about every second day and a total exposure time o…
Cosmography from accurate mass modeling of the lens group SDSS J0100+1818: Five sources at three different redshifts
Zanella, A.; Grillo, C.; Christensen, L. +6 more
Systems where multiple sources at different redshifts are strongly lensed by the same deflector allow one to directly investigate the evolution of the angular diameter distances as a function of redshift, and thus to learn about the geometry of the Universe. We present measurements of the values of the total matter density, Ωm, and of t…
Imaging of I Zw 18 by JWST: II. Spatially resolved star formation history
Henning, Thomas; Hirschauer, Alec S.; Boyer, Martha L. +14 more
Context. The blue compact dwarf (BCD) galaxy I Zw 18 is one of the most metal-poor (Z ∼ 3% Z⊙) star-forming galaxies known in the local Universe. Since its discovery, the evolutionary status of this system has been at the center of numerous debates within the astronomical community. Aims. We aim to probe and resolve the stellar populati…
Discovery of the magnetic cataclysmic variable XMM J152737.4-205305.9 with a deep eclipse-like feature
Brink, Jaco; Buckley, David A. H.; Schwope, Axel +1 more
We report the identification and subsequent examination of a polar-type cataclysmic variable named XMM J152737.4−205305.9 newly discovered with the X-ray Multi-Mirror Mission (XMM-Newton). This discovery was made by matching the XMM-Newton data archive with the cataclysmic variable candidate catalog provided by Gaia Data Release 3 (DR3). The use o…
First spectroscopic investigation of anomalous Cepheid variables
Ripepi, V.; Molinaro, R.; Marconi, M. +12 more
Context. Anomalous Cepheids (ACEPs) are intermediate-mass metal-poor pulsators that are mostly discovered in dwarf galaxies of the Local Group. However, recent Galactic surveys, including the Gaia Data Release 3, found a few hundred ACEPs in the Milky Way. Their origin is only poorly understood.
Aims: We aim to investigate the origin and evol…
X-raying the ζ Tau binary system
Smith, Myron A.; Nazé, Yaël; Rauw, Gregor +2 more
Context. The Be star ζ Tau was recently reported to be a γ Cas analog; that is, it displays an atypical (bright and hard) X-ray emission. The origin of these X-rays remains debated.
Aims: The first X-ray observations indicated a very large absorption of the hot plasma component (NH ~ 1023 cm−2). This is most p…
Euclid: High-precision imaging astrometry and photometry from Early Release Observations: I. Internal kinematics of NGC6397 by combining Euclid and Gaia data
Altieri, B.; Cimatti, A.; Baccigalupi, C. +175 more
The instruments at the focus of the Euclid space observatory offer superb, diffraction-limited imaging over an unprecedented (from space) wide field of view of 0.57 deg2. This exquisite image quality has the potential to produce high-precision astrometry for point sources once the undersampling of Euclid's cameras is taken into account …
The GAPS programme at TNG. LVII. TOI-5076b: A warm sub-Neptune planet orbiting a thin-to-thick-disk transition star in a wide binary system
Scandariato, G.; Pagano, I.; Winn, J. N. +36 more
Aims: We report the confirmation of a new transiting exoplanet orbiting the star TOI-5076.
Methods: We present our vetting procedure and follow-up observations which led to the confirmation of the exoplanet TOI-5076b. In particular, we employed high-precision TESS photometry, high-angular-resolution imaging from several telescopes, and h…