Search Publications
CORALIE radial-velocity search for companions around evolved stars (CASCADES). I. Sample definition and first results: Three new planets orbiting giant stars
Buldgen, G.; Eggenberger, P.; Ségransan, D. +11 more
Context. Following the first discovery of a planet orbiting a giant star in 2002, we started the CORALIE radial-velocity search for companions around evolved stars. We present the observations of three stars conducted at the 1.2 m Leonard Euler Swiss telescope at La Silla Observatory, Chile, using the CORALIE spectrograph.
Aims: We aim to det…
A giant planet shaping the disk around the very low-mass star CIDA 1
Lodato, G.; Testi, L.; Lombardi, M. +13 more
Context. Exoplanetary research has provided us with exciting discoveries of planets around very low-mass (VLM) stars (0.08 M⊙ ≲ M* ≲ 0.3 M⊙; e.g., TRAPPIST-1 and Proxima Centauri). However, current theoretical models still strive to explain planet formation in these conditions and do not predict the development of …
The VMC survey. XLV. Proper motion of the outer LMC and the impact of the SMC
de Grijs, Richard; Ripepi, Vincenzo; Cioni, Maria-Rosa L. +8 more
Context. The Large Magellanic Cloud (LMC) is the most luminous satellite galaxy of the Milky Way and, owing to its companion, the Small Magellanic Cloud (SMC), represents an excellent laboratory to study the interaction of dwarf galaxies.
Aims: The aim of this study is to investigate the kinematics of the outer regions of the LMC by using ste…
VLT spectropolarimetry of comet 67P: dust environment around the end of its intense southern summer
Kolokolova, Ludmilla; Agarwal, Jessica; Snodgrass, Colin +5 more
Context. A cornucopia of Rosetta and ground-based observational data sheds light on the evolution of the characteristics of dust particles from comet 67P/Churyumov-Gerasimenko (hereafter 67P) with seasons, implying the different dust environments in the source regions on the surface of the comet.
Aims: We aim to constrain the properties of th…
Near-infrared observations of RR Lyrae and Type II Cepheid variables in the metal-rich bulge globular cluster NGC 6441
Rejkuba, M.; Ripepi, V.; Marconi, M. +4 more
Context. NGC 6441 is a bulge globular cluster (GC) with an unusual horizontal branch morphology and a rich population of RR Lyrae (RRL) and Type II Cepheid (T2C) variables that is unexpected for its relatively high metallicity.
Aims: Our goal is to characterize the pulsation properties of the population II RRL and T2C variables in this metal-…
A multi-planetary system orbiting the early-M dwarf TOI-1238
Nagel, E.; Amado, P. J.; Caballero, J. A. +53 more
Context. The number of super-Earth and Earth-mass planet discoveries has increased significantly in the last two decades thanks to the Doppler radial velocity and planetary transit observing techniques. Either technique can detect planet candidates on its own, but the power of a combined photometric and spectroscopic analysis is unique for an insi…
Identification of SRGt 062340.2-265751 as a bright, strongly variable, novalike cataclysmic variable
Maitra, Chandreyee; Wilms, Jörn; Buckley, David A. H. +10 more
We report the identification and follow-up of the transient SRGt 062340.2-265751 detected with both instruments on board the Spektrum-Roentgen-Gamma mission. Optical spectroscopy of the G = 12.5 counterpart firmly classifies the object as a novalike cataclysmic variable (CV) at a distance of 495 pc. A highly significant TESS period of 3.941 h, ten…
First detection of a magnetic field in low-luminosity B[e] stars. New scenarios for the nature and evolutionary stages of FS CMa stars
Manset, N.; Sestito, F.; Raj, A. +8 more
We report the first detection of the magnetic field in a star of FS CMa type, a subgroup of objects characterized by the B[e] phenomenon. The split of magnetically sensitive lines in IRAS 17449+2320 determines the magnetic field modulus of 6.2 ± 0.2 kG. Spectral lines and their variability reveal the presence of a B-type spectrum and a hot continu…
Unravelling UBC 274: A morphological, kinematical, and chemical analysis of a disrupting open cluster
Castro-Ginard, A.; Casamiquela, L.; Soubiran, C. +8 more
Context. Open clusters in the process of disruption help to understand the formation and evolution of the Galactic disk. The wealth and homogeneity of Gaia data have led to the discovery of several open clusters with signs of disruption. Detailed chemical information for these clusters is essential in order to study the timescales and interplay be…
SRG/eROSITA discovery of 164 s pulsations from the SMC Be/X-ray binary XMMU J010429.4-723136
Haberl, F.; Schwope, A.; Monageng, I. M. +5 more
Context. The Small Magellanic Cloud (SMC) hosts many known high-mass X-ray binaries (HMXBs), and all but one (SMC X-1) have a Be companion star. Through the calibration and verification phase of eROSITA on board the Spektrum-Roentgen-Gamma (SRG) spacecraft, the Be/X-ray binary XMMU J010429.4-723136 was in the field of view during observations of t…