Search Publications
BiSpeD: Binary Spectral Disentangling applied to binary low-mass star searches
González, J. F.; Martínez, C. I.
Context. In a companion paper, we present a novel method for the spectroscopic detection of low-luminosity secondary companions of binary stars. An interesting application field is the identification of very low-mass stars as companions of late-type main-sequence stars. Aims. To provide a simple tool based on our method, we developed Binary Spectr…
Examining the evolution of the supersoft X-ray source RX J0513.9 ‑ 6951
Werner, K.; Santangelo, A.; Suleimanov, V. F. +1 more
Context. Supersoft X-ray sources (SSSs) are thought to be accreting white dwarfs (WDs) in close binary systems, with thermonuclear burning on their surfaces. The SSS RX J0513.9 ‑ 6951 in the Large Magellanic Cloud (LMC) exhibits cyclic variations between optical low and high states, which are anti-correlated with its X-ray flux. This behaviour is …
Spectra of standing kink waves in loops and the effects of the lower solar atmosphere
Gao, Yuhang; Van Doorsselaere, Tom; Lim, Daye +1 more
Context. Understanding the effects of the lower solar atmosphere on the spectrum of standing kink oscillations of coronal loops, in both the decaying and decayless regime, is essential for developing more advanced tools for coronal seismology. Aims. We aim to reveal the effects of the chromosphere on the spatial profiles and frequencies of the sta…
Insights into the origins of Phobos and Deimos based on a spectral comparison with small bodies and Martian materials
Fornasier, S.; Doressoundiram, A.; Mahlke, M. +4 more
Context. The origins of Phobos and Deimos are highly debated, and several distinct hypotheses have been put forth. The two most widely accepted theories are that (1) the two moons were created by a giant impact in analogy to the Earth-Moon system, whereby a debris disk was formed that then formed the two moons by accretion; and that (2) the moons …
Toward the fabric of the Milky Way: I. The density of disk streams from a local 2503 pc3 volume
Meingast, Stefan; Alves, João; Ratzenböck, Sebastian +3 more
We studied 12 disk streams found in a 2503 pc3 volume in the solar neighborhood, which we define as coeval and comoving stellar structures with aspect ratios greater than 3:1. Using Gaia Data Release 3 data and the advanced clustering algorithms SigMA and Uncover, we identified and characterized these streams beyond the searc…
HADES RV Programme with HARPS-N at TNG: XVI. A super-Earth in the habitable zone of the GJ 3998 multi-planet system
Rebolo, R.; Ribas, I.; Scandariato, G. +12 more
The low masses of M dwarfs create attractive opportunities for exoplanet radial-velocity (RV) detections. These stars, however, exhibit strong stellar activity that may attenuate or mimic planetary signals. We present a velocimetric analysis of one such M dwarf, GJ 3998 (d = 18.2 pc), with two published short-period super-Earths: GJ 3998 b and GJ …
New ultracool dwarf candidates from multi-epoch WISE data
Malkov, O.; Karpov, S.; Avdeeva, A.
Context. Thirty years after the discovery of brown dwarfs, the search for these objects continues, particularly in the vicinity of the Sun. Objects near the Sun are characterized by large proper motions, making them be seen as fast-moving objects. While the Gaia DR3 catalog is a comprehensive source of proper motions, it lacks the depth needed for…
Impact of radiative accelerations on the stellar characterization of FGK-type stars using spectroscopic and seismic constraints
Deal, Morgan; Bossini, Diego; Moedas, Nuno
Context. Chemical transport mechanisms are fundamental processes in stellar evolution models. They are responsible for the chemical distribution, and their impact determines how accurately we can characterize stars. Radiative accelerations are one of these processes. They allow the accumulation of elements at different depths in the star. Aims. We…
First Doppler image and starspot-corrected orbit for λ Andromedae: A multifaceted activity analysis
Strassmeier, K. G.; Weber, M.; Gruner, D. +3 more
Context. Starspots on a rotating stellar surface impact the measured radial velocities and thereby limit the determination of precise orbital elements as well as astrophysical stellar parameters and even jeopardize the detection and characterization of (exo)planets. Aims. We quantify the effect of starspots for the orbital elements of the spotted …
Production of linear alkanes via the solid-state hydrogenation of interstellar polyynes
Li, X.; Palumbo, M. E.; Chuang, K. -J. +2 more
Context. Highly unsaturated carbon chains, including polyynes, have been detected in many astronomical regions and planetary systems. With the success of the QUIJOTE survey of the Taurus Molecular Cloud-1 (TMC-1), the community has seen a "boom" in the number of detected carbon chains. On the other hand, the Rosetta mission revealed the release of…