Search Publications
Swarming in stellar streams: Unveiling the structure of the Jhelum stream with ant colony-inspired computation
Smith, R.; Balbinot, E.; Peletier, R. +8 more
The halo of the Milky Way galaxy hosts multiple dynamically coherent substructures known as stellar streams that are remnants of tidally disrupted orbiting systems such as globular clusters (GCs) and dwarf galaxies (DGs). A particular case is that of the Jhelum stream, which is known for its unusual and complex morphology. Using the available data…
Sausage, kink, and fluting magnetohydrodynamic wave modes identified in solar magnetic pores by Solar Orbiter/PHI
Woch, J.; Solanki, S. K.; Schou, J. +25 more
Solar pores are intense concentrations of magnetic flux that emerge through the solar photosphere. When compared to sunspots, they are much smaller in diameter and can therefore be affected and buffeted by neighbouring granular activity to generate significant magnetohydrodynamic (MHD) wave energy flux within their confines. However, observations …
Implications of the discovery of AF Lep b. The mass-luminosity relation for planets in the β Pic Moving Group and the L-T transition for young companions and free-floating planets
D'Orazi, V.; Zurlo, A.; Desidera, S. +7 more
Context. Dynamical masses of young planets aged between 10 and 200 Myr detected in imaging play a crucial role in shaping models of giant planet formation. Regrettably, only a few such objects possess these characteristics. Furthermore, the evolutionary pattern of young sub-stellar companions in near-infrared colour-magnitude diagrams might diverg…
Spectroscopic variability of massive pre-main-sequence stars in M17
Kaper, L.; de Koter, A.; van Gelder, M. L. +4 more
Context. It is a challenge to study the formation process of massive stars: their formation time is short, there are only few of them, they are often deeply embedded, and they lie at relatively large distances. Our strategy is to study the outcome of the star formation process and to search for signatures that remain of the formation. We have acce…
The visible and thermal light curve of the large Kuiper belt object (50000) Quaoar★
Pál, A.; Molnár, L.; Marton, G. +7 more
Recent stellar occultations have allowed accurate instantaneous size and apparent shape determinations of the large Kuiper belt object (50000) Quaoar and the detection of two rings with spatially variable optical depths. In this paper we present new visible range light curve data of Quaoar from the Kepler/K2 mission, and thermal light curves at 10…
FitteR for Accretion ProPErties of T Tauri stars (FRAPPE): A new approach to use class III spectra to derive stellar and accretion properties
Alcalá, J. M.; Natta, A.; Manara, C. F. +10 more
Context. Studies of the stellar and accretion properties of classical T Tauri stars (CTTS) require photospheric spectral templates to be compared with. The use of low-activity, slowly rotating field dwarfs or model spectra can be advantageous for the determination of stellar parameters, but it can lead to an overestimate of the mass accretion rate…
Searching for new cataclysmic variables in the Chandra Source Catalog
Riddle, Reed; Szkody, Paula; El-Badry, Kareem +14 more
Aims. Cataclysmic variables (CVs) are compact binary systems in which a white dwarf accretes matter from a Roche-lobe-filling companion star. For this study we searched for new CVs in the Milky Way in the Chandra Source Catalog v2.0, cross-matched with Gaia Data Release 3 (DR3). Methods. We identified new CV candidates by combining X-ray and optic…
The astrophysical parameters of chemically peculiar stars from automatic methods
Paunzen, E.
Context. The chemically peculiar (CP) stars of the upper main sequence are excellent astrophysical laboratories for investigating the diffusion, mass loss, rotational mixing, and pulsation in the presence and absence of a stable local magnetic field. For this, we need a homogeneous set of parameters, such as effective temperature (Teff)…
A companion in V1247 Ori supported by motion in the pattern of the spiral arm
Kraus, Stefan; Debes, John H.; Dong, Ruobing +8 more
While nearly two dozen spiral arms have been detected from planet-forming disks in near-infrared scattered light, none of their substellar drivers has been confirmed. By observing spiral systems in at least two epochs spanning multiple years and measuring the motion of the spirals, we can distinguish what causes the spirals and locate the orbits o…
A new catalog of magnetically active solar-like oscillators
Corsaro, E.; Giovannelli, L.; Di Mauro, M. P. +3 more
We present a new catalog of stars for which detected solar-like oscillations and magnetic activity measurements from chromospheric spectroscopic observations are both available. Our results were obtained by exploiting NASA TESS mission light curves for active stars observed within the Mount Wilson Observatory HK project and the HK survey of the Ha…