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The GAPS Programme at TNG: LXV. Precise density measurement of TOI-1430 b, a young planet with an evaporating atmosphere
Baratella, M.; Mallonn, M.; Scandariato, G. +34 more
Context. Small-sized (<4 R⊕) exoplanets in tight orbits around young stars (10–1000 Myr) give us the opportunity to investigate the mechanisms that led to their formation, the evolution of their physical and orbital properties, and, in particular, their atmospheres. Thanks to the all-sky survey carried out by the TESS spacecraft, man…
Luminosity Distance and Extinction by Submicrometer-sized Grains
Siebenmorgen, R.; Chini, R.; Heymann, Frank
The distance to the stars is a fundamental parameter, which is determined via two primary methods—parallax and luminosity. While the parallax is a direct trigonometric method, the luminosity distance is usually influenced by interstellar extinction. As long as the optical properties of dust grains are wavelength-dependent this contamination can be…
Spectral features and variable circular polarisation in the radio emission from the pre-cataclysmic variable QS Vir
Heinke, C. O.; Sivakoff, G. R.; Hughes, A. K. +2 more
Context. QS Vir is a low-accretion rate cataclysmic variable (CV), or pre-CV, as the M dwarf companion is just filling its Roche lobe. We recently identified radio emission from QS Vir in the Very Large Array Sky Survey (VLASS), at a flux of ∼1 mJy. The origin of radio emission from CVs is not fully understood, with evidence for synchrotron emissi…
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 …
Global comparative basin hypsometric analysis of Earth and Mars: Implications for early Mars climate
Fang, J.; Luo, W.; Howard, A. D. +3 more
While there is a consensus that water played at least some role in the formation of various Martian landforms, including valley networks (VNs), the specific mechanisms and climate conditions are still debated. Basin hypsometric curves, reflecting elevation distributions, offer insights into past processes and climates. Our study presents a global-…
Advanced charge control dynamics simulation for the LISA gravitational reference sensor
Kenyon, Samantha Parry; Apple, Stephen; Siu, John +2 more
A gravitational wave detector in space, the Laser Interferometer Space Antenna (LISA) will be able to detect gravitational waves in the frequency range of 0.1 mHz–1 Hz, adding to humanity's knowledge of the dark cosmos. The LISA gravitational reference sensor contains a test mass (TM) and is used to determine the local inertial reference frame and…
Martian Atmospheric Disturbances From Orbital Images and Surface Pressure at Jezero Crater, Mars, During Martian Year 36
Hueso, R.; Sánchez-Lavega, A.; Toledo, D. +13 more
We present a study of atmospheric disturbances at Jezero Crater, Mars, using ground-based measurements of surface pressure by the Perseverance rover in combination with orbital images from the Mars Express and Mars Reconnaissance Orbiter missions. The study starts at Ls ∼ 13.3° in MY36 (6 March 2021) and extends up to Ls ∼ 30…
Revisiting Variable Stars Near Globular Clusters South of ‑29° Declination
Layden, Andrew C.; Evangelista, Julia; Gupta, Sakshi +5 more
We review an often-cited but seldom-accessed catalogue by Fourcade and Laborde (1966) of 785 variable stars near 47 southern Galactic globular clusters, and recover the locations of 85 stars that were not incorporated into subsequent variable star catalogues and hence have become "lost" to the literature. We match the positions of these stars with…
Cleaning WASP-33 b transits from the host star photometric variability: analysis of TESS data from two sectors
Baluev, Roman V.; Sokov, Eugene N.
Based on TESS observations of a