Zobrazeno 1 - 10
of 512
pro vyhledávání: '"Nayakshin, Sergei"'
High-mass young stellar objects (HMYSOs) can exhibit episodic bursts of accretion, accompanied by intense outflows and luminosity variations. Thermal Instability (TI) due to Hydrogen ionisation is among the most promising mechanisms of episodic accre
Externí odkaz:
http://arxiv.org/abs/2411.06949
Recent imaging observations with ALMA and other telescopes found widespread signatures of planet presence in protoplanetary discs at tens of au separations from their host stars. Here we point out that the presence of very massive planets at 0.1 au s
Externí odkaz:
http://arxiv.org/abs/2405.09904
Current imaging observations of protoplanetary disks using ALMA primarily focus on the sub-millimeter wavelength, leaving a gap in effective observational approaches for centimeter-sized dust, which is crucial to the issue of planet formation. The fo
Externí odkaz:
http://arxiv.org/abs/2403.04754
Autor:
Nayakshin, Sergei, de Miera, Fernando Cruz Saenz, Kospal, Agnes, Calovic, Aleksandra, Eisloffel, Jochen, Lin, Douglas N. C.
In the classical grouping of large magnitude episodic variability of young accreting stars, FUORs outshine their stars by a factor of $\sim$ 100, and can last for up to centuries; EXORs are dimmer, and last months to a year. A disc Hydrogen ionisatio
Externí odkaz:
http://arxiv.org/abs/2403.04439
Autor:
Pounds, Ken, Nayakshin, Sergei
The luminous narrow line Seyfert galaxy PG1211+143 was the first non-BAL AGN to reveal a powerful ionized wind, based on early observations with ESA's XMM X-ray Observatory. Subsequent observations, mainly with XMM and the Japanese SUZAKU Observatory
Externí odkaz:
http://arxiv.org/abs/2310.18105
Autor:
Nayakshin, Sergei, Elbakyan, Vardan
Accretion luminosity of young star FU Ori increased from undetectable levels to hundreds of Solar luminosities in 1937 and remains nearly as high at the present time. In a recent paper we showed how Extreme Evaporation (EE) of a young gas giant plane
Externí odkaz:
http://arxiv.org/abs/2309.12072
Disc accretion rate onto low mass protostar FU Ori suddenly increased hundreds of times 85 years ago and remains elevated to this day. We show that the sum of historic and recent observations challenges existing FU Ori models. We build a theory of a
Externí odkaz:
http://arxiv.org/abs/2305.03392
ALMA has spatially resolved over 200 annular structures in protoplanetary discs, many of which are suggestive of the presence of planets. Constraining the mass of these putative planets is quite degenerate for it depends on the disc physical properti
Externí odkaz:
http://arxiv.org/abs/2305.01493
3D simulations of high mass young stellar object (HMYSO) growth show that their circumstellar discs fragment onto multiple self-gravitating objects. Accretion of these by HMYSO may explain episodic accretion bursts discovered recently. We post-proces
Externí odkaz:
http://arxiv.org/abs/2210.10165
Planets open deep gaps in protoplanetary discs when their mass exceeds a gap opening mass, $M_{\rm gap}$. We use one- and two-dimensional simulations to study planet gap opening in discs with angular momentum transport powered by MHD disc winds. We p
Externí odkaz:
http://arxiv.org/abs/2206.11595