Search Publications
Combined geometrical modelling and white-light mass determination of coronal mass ejections
Vourlidas, Angelos; Bothmer, Volker; Pluta, Adam +2 more
Context. We use forward modelling on multi-viewpoint coronagraph observations to estimate the 3-dimensional morphology, initial speed and deprojected masses of Coronal Mass Ejections (CMEs). The CME structure is described via the Graduated Cylindrical Shell (GCS) model, which enables the measurement of CME parameters in a consistent and comparable…
HST/STIS analysis of the first main sequence pulsar CU Virginis
Pigulski, A.; Trigilio, C.; Leto, P. +9 more
Context. CU Vir has been the first main sequence star that showed regular radio pulses that persist for decades, resembling the radio lighthouse of pulsars and interpreted as auroral radio emission similar to that found in planets. The star belongs to a rare group of magnetic chemically peculiar stars with variable rotational period.
Aims: We…
NGTS-5b: a highly inflated planet offering insights into the sub-Jovian desert
Smalley, Barry; Jackman, James A. G.; Wheatley, Peter J. +32 more
Context. Planetary population analysis gives us insight into formation and evolution processes. For short-period planets, the sub-Jovian desert has been discussed in recent years with regard to the planet population in the mass/period and radius/period parameter space without taking stellar parameters into account. The Next Generation Transit Surv…
MUSE library of stellar spectra
Coccato, Lodovico; Ivanov, Valentin D.; Corsini, Enrico M. +5 more
Context. Empirical stellar spectral libraries have applications in both extragalactic and stellar studies, and they confer an advantage over theoretical libraries because they naturally include all relevant chemical species and physical processes. In recent years we have seen a stream of new sets of high-quality spectra, but increasing the spectra…
Formation of coronal rain triggered by impulsive heating associated with magnetic reconnection
Kohutova, P.; Verwichte, E.; Froment, C.
Context. Coronal rain consists of cool plasma condensations formed in coronal loops as a result of thermal instability. The standard models of coronal rain formation assume that the heating is quasi-steady and localised at the coronal loop footpoints.
Aims: We present an observation of magnetic reconnection in the corona and the associated im…
XMM-Newton observations of PSR J0726-2612, a radio-loud XDINS
Pintore, Fabio; Mereghetti, Sandro; Turolla, Roberto +4 more
We present the results of an XMM-Newton observation of the slowly rotating (P = 3.4 s), highly magnetized (B ≈ 3 × 1013 G) radio pulsar PSR J0726-2612. A previous X-ray observation with the Chandra satellite showed that some of the properties of PSR J0726-2612 are similar to those of the X-ray-dim isolated neutron stars (XDINSs), a smal…
Warm and cool starspots with opposite polarities. A high-resolution Zeeman-Doppler-Imaging study of II Pegasi with PEPSI
Strassmeier, K. G.; Carroll, T. A.; Ilyin, I. V.
Aims: We present a temperature and a magnetic-field surface map of the K2 subgiant of the active binary II Peg. Employed are high resolution Stokes IV spectra obtained with the new Potsdam Echelle Polarimetric and Spectroscopic Instrument (PEPSI) at the Large Binocular Telescope (LBT).
Methods: Fourteen average line profiles are inverted…
A comparison between solar plage and network properties
Solanki, S. K.; Lagg, A.; van Noort, M. +1 more
Aims: We compare the properties of kG magnetic structures in the solar network and in active region plage at high spatial resolution.
Methods: Our analysis used six SP scans of the solar disc centre aboard Hinode SOT and inverted the obtained spectra of the photospheric 6302 Å line pair using the 2D SPINOR code.
Results: Photospheri…
Discovery of an old nova remnant in the Galactic globular cluster M 22
Bacon, Roland; Brinchmann, Jarle; Schmidt, Kasper B. +11 more
A nova is a cataclysmic event on the surface of a white dwarf in a binary system that increases the overall brightness by several orders of magnitude. Although binary systems with a white dwarf are expected to be overabundant in globular clusters compared with in the Galaxy, only two novae from Galactic globular clusters have been observed. We pre…
An extremely X-ray weak blazar at z = 5
Ghisellini, G.; Moretti, A.; Caccianiga, A. +5 more
We present the discovery and properties of DES J014132.4-542749.9 (DES0141-54), a new powerful radio-loud active galactic nucleus (AGN) in the early Universe (z = 5.0). It was discovered by cross-matching the first data release of the Dark Energy Survey (DES DR1) with the Sidney University Molonglo Survey (SUMSS) radio catalog at 0.843 GHz. This o…