Search Publications
Simultaneous X-ray and optical spectroscopy of V404 Cygni supports the multi-phase nature of X-ray binary accretion disc winds
Ponti, Gabriele; Muñoz-Darias, Teo
Observational signatures of accretion disc winds have been found in a significant number of low-mass X-ray binaries at either X-ray or optical wavelengths. The 2015 outburst of the black hole transient V404 Cygni provided a unique opportunity for studying both types of outflows in the same system. We used contemporaneous X-ray (Chandra Observatory…
Searching for Hα-emitting sources in the gaps of five transitional disks. SPHERE/ZIMPOL high-contrast imaging
de Gregorio-Monsalvo, I.; Quanz, S. P.; Montesinos, B. +13 more
Context. (Pre-)Transitional disks show gaps and cavities that can be related to ongoing planet formation. According to theory, young embedded planets can accrete material from the circumplanetary and circumstellar disks and can be detected using accretion tracers, such as the Hα emission line.
Aims: We aim to detect accreting proto…
The HD 137496 system: A dense, hot super-Mercury and a cold Jupiter
Bossini, D.; Adibekyan, V.; Hoyer, S. +28 more
Context. Most of the currently known planets are small worlds with radii between that of the Earth and that of Neptune. The characterization of planets in this regime shows a large diversity in compositions and system architectures, with distributions hinting at a multitude of formation and evolution scenarios. However, many planetary populations,…
Magnetic helicity and energy of emerging solar active regions and their erruptivity
Liu, Y.; Nindos, A.; Liokati, E.
Aims: We investigate the role of the accumulation of magnetic helicity and magnetic energy in the generation of coronal mass ejections (CMEs) from emerging solar active regions (ARs).
Methods: Using vector magnetic field data obtained by the Helioseismic and Magnetic Imager on board the Solar Dynamics Observatory, we calculated the magne…
The supernova of the MAGIC gamma-ray burst GRB 190114C
Covino, S.; D'Avanzo, P.; Campana, S. +42 more
We observed GRB 190114C (redshift z = 0.4245), the first gamma-ray burst (GRB) ever detected at TeV energies, at optical and near-infrared wavelengths with several ground-based telescopes and the Hubble Space Telescope, with the primary goal of studying its underlying supernova, SN 2019jrj. The monitoring spanned the time interval between 1.3 and …
CRIRES high-resolution near-infrared spectroscopy of diffuse interstellar band profiles. Detection of 12 new DIBs in the YJ band and the introduction of a combined ISM sight line and stellar analysis approach
Butler, K.; Weßmayer, D.; Przybilla, N. +7 more
Aims: A high spectral resolution investigation of diffuse interstellar bands (DIBs) in the near-infrared (YJ band) is conducted to test new methods, to confirm and improve existing parameters, and to search for new DIBs.
Methods: The CRyogenic high-resolution InfraRed Echelle Spectrograph (CRIRES) on the European Southern Observatory's V…
Properties of the interstellar medium in star-forming galaxies at redshifts 2 ≤ z ≤ 5 from the VANDELS survey
Schaerer, D.; Castellano, M.; Pentericci, L. +16 more
Gaseous flows inside and outside galaxies are key to understanding galaxy evolution, as they regulate their star formation activity and chemical enrichment across cosmic time. We study the interstellar medium (ISM) kinematics of a sample of 330 galaxies with C III] or He II emission using far-ultraviolet (far-UV) ISM absorption lines detected in t…
Localizing narrow Fe Kα emission within bright AGN
Brandt, William N.; Ricci, Claudio; Bauer, Franz E. +11 more
Context. The 6.4 keV Fe Kα emission line is a ubiquitous feature in X-ray spectra of active galactic nuclei (AGN), and its properties track the interaction between the variable primary X-ray continuum and the surrounding structure from which it arises.
Aims: We clarify the nature and origin of the narrow Fe Kα emission using X-ray spectral, t…
Eclipse of the V773 Tau B circumbinary disc
Ginski, C.; Mugrauer, M.; Vogt, N. +9 more
Context. Young multiple stellar systems can host both circumstellar and circumbinary discs composed of gas and dust, and the orientations of circumbinary discs can be sculpted by the orientation and eccentricity of the central binaries. Studying multiple binary systems and their associated discs enables our understanding of the size and distributi…
Constraints to neutron-star kicks in high-mass X-ray binaries with Gaia EDR3
García, Federico; Chaty, Sylvain; Fortin, Francis +2 more
Context. All neutron star progenitors in neutron-star high-mass X-ray binaries (NS HMXBs) undergo a supernova event that may lead to a significant natal kick impacting the motion of the whole binary system. The space observatory Gaia performs a deep optical survey with exquisite astrometric accuracy, for both position and proper motions, that can …