Search Publications
The VELOCE modulation zoo: II. Humps and splitting patterns in spectral lines of classical Cepheids
Anderson, R. I.; Netzel, H.; Viviani, G.
Context. Line splitting in spectral lines is observed in various types of stars due to phenomena such as shocks, spectroscopic binaries, magnetic fields, spots, and nonradial modes. In pulsating stars, line splitting is often attributed to pulsation-induced shocks. However, this is rarely observed in classical Cepheids, with only a few reports; th…
VLTI/GRAVITY upper limit on near-infrared emission from the nearby 33 M⊙ black hole Gaia BH3
Mérand, Antoine; Le Bouquin, Jean-Baptiste; Mazeh, Tsevi +11 more
Context. The recent astrometric discovery of the nearby (590 pc) massive (33 M⊙) dormant black hole candidate Gaia BH3 offers the possibility to angularly resolve the black hole from its companion star by using optical interferometry. Aims. Our aim is to detect emission in the near-infrared K band from the close-in environment of Gaia B…
Confirmation of the planetary nebula nature of HaTr 5: Not a remnant of Nova Sco 1437
Ritter, A.; Guerrero, M. A.; Toalá, J. A. +6 more
Context. The identification of the nebula HaTr 5 with the shell remnant of the historic Nova Sco 1437 around the low-accretion rate cataclysmic variable 2MASS J17022815-4306123 has been used in the framework of the hibernation scenario to set an upper limit of ≤580 yr on the transition time from a nova-like binary to a dwarf nova. Aims. This work …
The Solar System's passage through the Radcliffe wave during the middle Miocene
Miret-Roig, N.; Burkert, A.; Alves, J. +14 more
Context. As the Solar System orbits the Milky Way, it encounters various Galactic environments, including dense regions of the interstellar medium (ISM). These encounters can compress the heliosphere, exposing parts of the Solar System to the ISM, while also increasing the influx of interstellar dust into the Solar System and Earth's atmosphere. T…
Spectroscopic detection of a 2.9-hour orbit in a long-period radio transient
Rodriguez, Antonio C.
Long-period radio transients (LPTs) are a mysterious new class of radio transients pulsating on periods of minutes to hours. To date, nine LPTs have been discovered predominantly at low Galactic latitudes, and yet their nature remains unknown. Here I present the first phase-resolved optical spectroscopy of the 2.9 h LPT GLEAM-X J0704–37, acquired …
REsolved ALMA and SMA Observations of Nearby Stars (REASONS): A population of 74 resolved planetesimal belts at millimetre wavelengths
Krivov, A. V.; Marshall, J. P.; del Burgo, C. +19 more
Context. Planetesimal belts are ubiquitous around nearby stars, and their spatial properties hold crucial information for planetesimal and planet formation models. Aims. We present resolved dust observations of 74 planetary systems as part of the REsolved ALMA and SMA Observations of Nearby Stars (REASONS) survey and archival reanalysis. Methods. …
Determining the acceleration regions of in situ electrons using remote radio and X-ray observations
Jebaraj, I. C.; Vainio, R.; Kilpua, E. K. J. +13 more
Context. Solar energetic particles in the heliosphere are produced by flaring processes on the Sun or by shocks driven by coronal mass ejections. These particles are regularly detected remotely as electromagnetic radiation (X-rays or radio emission), which they generate through various processes, or in situ by spacecraft monitoring the Sun and the…
A multi-wavelength view of the isolated neutron star eRASSU J065715.3+260428
Haberl, F.; Pires, A. M.; Ji, L. +6 more
On the premise of a soft spectral distribution and absence of counterparts, the X-ray source eRASSU J065715.3+260428 was recently identified as a likely thermally emitting isolated neutron star (XINS) in a search in the SRG/eROSITA All-Sky Survey. We investigated the nature and evolutionary state of the neutron star through a dedicated multi-wavel…
New stellar bow shocks and bubbles found around runaway stars
Paredes, J. M.; Ribó, M.; Benaglia, P. +1 more
Context. Runaway stars with peculiar high velocities can generate stellar bow shocks. Only a few bow shocks show clear radio emission. Aims. Our goal is to identify and characterize new stellar bow shocks around O and Be runaway stars in the infrared (IR), as well as to study their possible radio emission and nature. Methods. Our input data is a c…
Radio dimming associated with filament eruptions in the meter and decimeter wavebands
Feng, Li; Tian, Hui; Madjarska, Maria S. +12 more
Filament eruptions are considered to be a common phenomenon on the Sun and other stars, yet they are rarely directly imaged in the meter and decimeter wavebands. Using imaging data from the DAocheng solar Radio Telescope (DART) in the 150‑450 MHz frequency range, we present two eruptive filaments that manifest as radio dimmings (i.e., emission dep…