Search Publications
Gas compression and stellar feedback in the tidally interacting and ram-pressure stripped Virgo spiral galaxy NGC 4654
Braine, J.; Vollmer, B.; Lizée, T. +1 more
Due to an environment that promotes gravitational interactions and ram pressure stripping, galaxies within clusters are particularly likely to present unusual interstellar medium (ISM) properties. NGC 4654 is a Virgo cluster galaxy seen almost face-on, which undergoes nearly edge-on gas ram pressure stripping and a fly-by gravitational interaction…
First observations from the SPICE EUV spectrometer on Solar Orbiter
Williams, D.; Peter, H.; Chitta, L. P. +28 more
Aims: We present first science observations taken during the commissioning activities of the Spectral Imaging of the Coronal Environment (SPICE) instrument on the ESA/NASA Solar Orbiter mission. SPICE is a high-resolution imaging spectrometer operating at extreme ultraviolet (EUV) wavelengths. In this paper we illustrate the possible types of…
Testing abundance-age relations beyond solar analogues with Kepler LEGACY stars
Miglio, Andrea; Montalbán, Josefina; Morel, Thierry +2 more
The prospects of using abundance ratios as stellar age indicators appear promising for solar analogues, but the usefulness of this technique for stars spanning a much wider parameter space remains to be established. We present abundances of 21 elements in a sample of 13 bright FG dwarfs drawn from the Kepler LEGACY sample to examine the applicabil…
Three microlensing planets with no caustic-crossing features
Han, Cheongho; Udalski, Andrzej; Lee, Chung-Uk +31 more
Aims: We search for microlensing planets with signals exhibiting no caustic-crossing features, considering the possibility that such signals may be missed due to their weak and featureless nature.
Methods: For this purpose, we reexamine the lensing events found by the KMTNet survey before the 2019 season. From this investigation, we find…
TESS unveils the optical phase curve of KELT-1b. Thermal emission and ellipsoidal variation from the brown dwarf companion along with the stellar activity
Mallonn, M.; Agol, E.; von Essen, C. +8 more
We present the detection and analysis of the phase curve of KELT-1b at optical wavelengths, analyzing data taken by the Transiting Exoplanet Survey Satellite (TESS) during cycle 2 and sector 17. With a mass of ~27 MJup, KELT-1b is an example of a low-mass brown dwarf. Due to the high mass and close proximity of its companion, the host s…
Dispersal timescale of protoplanetary disks in the low-metallicity young cluster Dolidze 25
Neiner, C.; Micela, G.; Sciortino, S. +7 more
Context. The dispersal of protoplanetary disks sets the timescale that is available for planets to assemble, and thus it is one of the fundamental parameters in theories of planetary formation. Disk dispersal is determined by several properties of the central star, the disk itself, and the surrounding environment. In particular, the metallicity of…
The Tully-Fisher relation in dense groups at z ∼ 0.7 in the MAGIC survey
Finley, Hayley; Boogaard, Leindert A.; Brinchmann, Jarle +11 more
Context. Galaxies in dense environments are subject to interactions and mechanisms that directly affect their evolution by lowering their gas fractions and consequently reducing their star-forming capacity earlier than their isolated counterparts.
Aims: The aim of our project is to get new insights into the role of environment in the stellar …
Progress on the calibration of surface brightness-color relations for early- and late-type stars
Schaefer, G. H.; Perraut, K.; Nardetto, N. +8 more
Context. Surface brightness-color relations (SBCRs) are widely used for estimating angular diameters and deriving stellar properties. They are critical to derive extragalactic distances of early-type and late-type eclipsing binaries or, potentially, for extracting planetary parameters of late-type stars hosting planets. Various SBCRs have been imp…
Confirming NGC 6231 as the parent cluster of the runaway high-mass X-ray binary HD 153919/4U 1700-37 with Gaia DR2
Kaper, Lex; Renzo, Mathieu; van der Meij, Vincent +1 more
Context. A significant fraction (10-20%) of the most massive stars move through space with a high (v ≳ 30 km s−1) velocity. One of the possible physical explanations is that a supernova in a compact binary system results in a high recoil velocity of the system. If the system remains bound, it can be subsequently observed as a spectrosco…
Chemical analysis of prestellar cores in Ophiuchus yields short timescales and rapid collapse
Wyrowski, Friedrich; Menten, Karl M.; Lupi, Alessandro +4 more
Sun-like stars form from the contraction of cold and dense interstellar clouds. How the collapse proceeds and what the main physical processes are driving it, however, is still under debate and a final consensus on the timescale of the process has not been reached. If the contraction proceeds slowly, supported by strong magnetic fields and mediate…