Search Publications
Moving structures in ultraviolet bright points: Observations from Solar Orbiter/EUI
Li, Dong
Context. Moving structures have been detected in coronal bright points and in a solar flare in active regions that are bidirectional, symmetrical, simultaneous, and quasi-periodic. These could be regarded as observational evidence of plasma outflows via magnetic reconnection.
Aims: We explored pairs of moving structures in fifteen ultraviolet…
Constraining masses and separations of unseen companions to five accelerating nearby stars
Rouan, D.; Schmidt, T. O. B.; Henning, T. +40 more
Aims: In this work, we aim to constrain the masses and separations of potential substellar companions to five accelerating stars (HIP 1481, HIP 88399, HIP 96334, HIP 30314, and HIP 116063) using multiple data sets acquired with different techniques.
Methods: Our targets were originally observed as part of the SPHERE/SHINE survey, and rad…
CHEMOUT: CHEMical complexity in star-forming regions of the OUTer Galaxy. II. Methanol formation at low metallicity
Elia, D.; Magrini, L.; Caselli, P. +8 more
Context. The outer Galaxy is an environment with a lower metallicity than the regions surrounding the Sun and for this reason the formation and survival of molecules in star-forming regions located in the inner and outer Galaxy are expected to be different.
Aims: To gain understanding of how chemistry changes throughout the Milky Way, it is c…
Revisiting Ulysses electron data with a triple fit of velocity distributions
Fichtner, H.; Scherer, K.; Lazar, M. +1 more
Context. Given their uniqueness, the Ulysses data can still provide us with valuable new clues about the properties of plasma populations in the solar wind, and especially about their variations with heliographic coordinates. In the context of kinetic waves and instabilities in the solar wind plasma, the electron temperature anisotropy plays a cru…
Evolution of the critical torus instability height and coronal mass ejection likelihood in solar active regions
O'Kane, Jennifer; James, Alexander W.; Williams, David R.
Aims: Working towards improved space weather predictions, we aim to quantify how the critical height at which the torus instability drives coronal mass ejections (CMEs) varies over time in a sample of solar active regions.
Methods: We model the coronal magnetic fields of 42 active regions and quantify the critical height at their central…
Establishing the accuracy of asteroseismic mass and radius estimates of giant stars. III. KIC 4054905, an eclipsing binary with two 10 Gyr thick disk RGB stars
Grundahl, F.; Lund, M. N.; Miglio, A. +16 more
Context. Eclipsing binary stars with an oscillating giant component allow accurate stellar parameters to be derived and asteroseismic methods to be tested and calibrated. To this aim, suitable systems need to be firstly identified and secondly measured precisely and accurately. KIC 4054905 is one such system, which has been identified, but with me…
Deuteration of c-C3H2 towards the pre-stellar core L1544
Caselli, P.; Spezzano, S.; Sipilä, O. +7 more
Context. In the centre of pre-stellar cores, the deuterium fractionation is enhanced due to the cold temperatures and high densities. Therefore, the chemistry of deuterated molecules can be used to probe the evolution and the kinematics in the earliest stages of star formation.
Aims: We analyse emission maps of cyclopropenylidene, c-C3
Searching for anomalous microwave emission in nearby galaxies. K-band observations with the Sardinia Radio Telescope
Bianchi, S.; Madden, S. C.; Galliano, F. +9 more
Aims: We observed four nearby spiral galaxies (NGC 3627, NGC 4254, NGC 4736, and NGC 5055) in the K band with the 64-m Sardinia Radio Telescope, with the aim of detecting anomalous microwave emission (AME), a radiation component presumably due to spinning dust grains, which has been observed thus far in the Milky Way and only in a handful of …
THA 15−31: Discovery with VLT/X-shooter and Swift/UVOT of a new symbiotic star of the accreting-only variety
Masetti, N.; Munari, U.; Alcalá, J. M. +4 more
We report the discovery and characterization of a new symbiotic star of the accreting-only variety, which we observed in the optical/near-infrared (NIR) with VLT/X-shooter and in the X-rays/ultraviolet with Swift/UVOT+XRT. The new symbiotic star, THA 15−31, was previously described as a pre-main sequence star belonging to the Lupus 3 association. …
SRGA J124404.1-632232/SRGU J124403.8-632231: New X-ray pulsar discovered in the all-sky survey by the SRG
Haberl, F.; Santangelo, A.; Gromadzki, M. +12 more
Ongoing all-sky surveys by the eROSITA and the Mikhail Pavlinsky ART-XC telescopes on board the Spectrum-Roentgen-Gamma (SRG) mission have already revealed over a million of X-ray sources. One of them, SRGA J124404.1-632232/SRGU J124403.8-632231, was detected as a new source in the third (of the planned eight) consecutive X-ray surveys by ART-XC. …