Search Publications
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…
Study of two interacting interplanetary coronal mass ejections encountered by Solar Orbiter during its first perihelion passage. Observations and modeling
Müller, D.; Perri, S.; Romoli, M. +46 more
Context. Solar Orbiter, the new-generation mission dedicated to solar and heliospheric exploration, was successfully launched on February 10, 2020, 04:03 UTC from Cape Canaveral. During its first perihelion passage in June 2020, two successive interplanetary coronal mass ejections (ICMEs), propagating along the heliospheric current sheet (HCS), im…
Catalogue of exoplanets accessible in reflected starlight to the Nancy Grace Roman Space Telescope. Population study and prospects for phase-curve measurements
Rauer, H.; Csizmadia, Sz.; Cabrera, J. +3 more
Context. Reflected starlight measurements will open a new path in the characterization of directly imaged exoplanets. However, we still lack a population study of known targets to which this technique can be applied.
Aims: We investigate which of the about 4300 exoplanets confirmed to date are accessible for the Roman Space Telescope coronagr…
Linking nearby stellar streams to more distant halo overdensities
Helmi, A.; Balbinot, E.
Context. It has recently been shown that the halo near the Sun contains several kinematic substructures associated with past accretion events. For the more distant halo, there is evidence of large-scale density variations - in the form of stellar clouds or overdensities.
Aims: We study the link between the local halo kinematic groups and thre…
Distances to molecular clouds in the second Galactic quadrant
Wang, Hongchi; Xu, Ye; Su, Yang +5 more
We present distances to 76 medium-sized molecular clouds and an extra large-scale molecular cloud in the second Galactic quadrant (104. °75 < l < 150. °25 and |b| < 5. °25), 73 of which are accurately measured for the first time. Molecular cloud samples are drawn from l-b-V space (- 95 < VLSR < 25 km s-1) with …
Solar wind Alfvénicity during solar cycle 23 and 24. Perspective for future observations with Parker Solar Probe and Solar Orbiter
Bruno, R.; Lepri, S. T.; Zhao, L. +5 more
Context. Alfvénic fluctuations are ubiquitous features observed in solar wind, especially in the inner heliosphere. However, strong Alfvénic fluctuations are recovered in the near-Earth solar wind too, mainly in fast streams, but also in some cases in slow wind intervals, as highlighted in recent studies.
Aims: The present study focuses on a …