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Dramatic change in the boundary layer in the symbiotic recurrent nova T Coronae Borealis
(EDP Sciences, 2018-11)
A sudden increase in the rate at which material reaches the most internal part of an accretion disk, i.e., the boundary layer, can change its structure dramatically. We have witnessed such a change for the first time in ...
Resolving the Polarized Dust Emission of the Disk around the Massive Star Powering the HH 80-81 Radio Jet
(IOP Publishing, 2018-04)
Here we present deep (16 μJy beam-1), very high (40 mas) angular resolution 1.14 mm, polarimetric, Atacama Large Millimeter/submillimeter Array (ALMA) observations toward the massive protostar driving the HH 80-81 radio ...
Equatorial outflows driven by jets in Population III microquasars
(Springer, 2021-01)
Binary systems of Population III can evolve to microquasars when one of the stars collapses into a black hole. When the compact object accretes matter at a rate greater than the Eddington rate, powerful jets and winds ...
Radiation from the impact of broad-line region clouds onto AGN accretion disks
(EDP Sciences, 2020-04)
Context. Active galactic nuclei are supermassive black holes surrounded by an accretion disk, two populations of clouds, bipolar jets, and a dusty torus. The clouds move in Keplerian orbits at high velocities. In particular, ...
Modeling the Accretion Disk around the High-mass Protostar GGD 27-MM1
(IOP Publishing, 2020-01)
Recent high angular resolution (≃40 mas) ALMA observations at 1.14 mm resolve a compact (R ≃ 200 au), flattened dust structure perpendicular to the HH 80─81 jet emanating from the GGD 27-MM1 high-mass protostar, making it ...
Increasing activity in T CrB suggests nova eruption is impending
(IOP Publishing, 2020-10)
Estimates of the accretion rate in symbiotic recurrent novae (RNe) often fall short of theoretical expectations by orders of magnitude. This apparent discrepancy can be resolved if the accumulation of mass by the white ...
MASTER Optical Polarization Variability Detection in the Microquasar V404 Cyg/GS 2023+33
(IOP Publishing, 2016-12-09)
On 2015 June 15, the Swift space observatory discovered that the Galactic black hole candidate V404 Cyg was undergoing another active X-ray phase, after 25 years of inactivity. The 12 telescopes of the MASTER Global Robotic ...
An Asymmetric Keplerian Disk Surrounding the O-type Protostar IRAS 16547-4247
(IOP Publishing, 2019-02)
For the past few decades, there has been great interest in determining if even the most massive stars in our galaxy (namely the spectral O-type stars) are formed in a similar manner as the low- and intermediate-mass stars, ...
Coupling between the accreting corona and the relativistic jet in the microquasar GRS 1915+105
(Nature Research, 2022-03)
Accreting black holes emit highly collimated radio jets expanding at speeds approaching light speed. Some of these jets appear to be expanding at superluminal speeds due to geometric effects. While magnetic fields are ...
Transition disks: four candidates for ongoing giant planet formation in Ophiuchus
(EDP Sciences, 2012-03)
Among the large set of Spitzer-selected transitional disks that we have examined in the Ophiuchus molecular, four disks have been identified as (giant) planet-forming candidates based on the morphology of their spectral ...