Zobrazeno 1 - 10
of 93
pro vyhledávání: '"Pejcha, Ondrej"'
Autor:
Pešta, Milan, Pejcha, Ondřej
Photometric methods for identifying dark companion binaries - binary systems hosting quiescent black holes and neutron stars - operate by detecting ellipsoidal variations caused by tidal interactions. The limitation of this approach is that contact a
Externí odkaz:
http://arxiv.org/abs/2408.11100
Autor:
Landri, Camille, Pejcha, Ondřej
Massive stars in the red supergiant (RSG) phase are known to undergo strong mass loss through winds and observations indicate that a substantial part of this mass loss could be driven by localised and episodic outflows. Various mechanisms have been c
Externí odkaz:
http://arxiv.org/abs/2405.17563
Autor:
Gagnier, Damien, Pejcha, Ondrej
During common envelope evolution, an initially weak magnetic field may undergo amplification by interacting with spiral density waves and turbulence generated in the stellar envelope by the inspiralling companion. Using 3D magnetohydrodynamical simul
Externí odkaz:
http://arxiv.org/abs/2310.16880
The disruption of a star by the tidal forces of a spinning black hole causes the stellar stream to precess affecting the conditions for triggering the tidal disruption event (TDE). In this work, we study the effect that precession imprints on TDE lig
Externí odkaz:
http://arxiv.org/abs/2309.10040
Autor:
Cehula, Jakub, Pejcha, Ondřej
Calculation of the mass transfer (MT) rate $\dot{M}_\text{d}$ of a Roche lobe overflowing star is a fundamental task in binary star evolution theory. Most of the existing MT prescriptions are based on a common set of assumptions that combine opticall
Externí odkaz:
http://arxiv.org/abs/2303.05526
Autor:
Gagnier, Damien, Pejcha, Ondřej
Publikováno v:
A&A 674, A121 (2023)
After the companion dynamically plunges through the primary's envelope, the two cores remain surrounded by a common envelope and the decrease of the orbital period $P_\text{orb}$ stalls. The subsequent evolution has never been systematically explored
Externí odkaz:
http://arxiv.org/abs/2302.00691
Autor:
Pejcha, Ondřej
Publikováno v:
Proceedings of the International Astronomical Union, 2022, Volume 366, pp. 159-164
Some binary stars experience common envelope evolution, which is accompanied by drastic loss of angular momentum, mass, and orbital energy and which leaves behind close binaries often involving at least one white dwarf, neutron star, or black hole. T
Externí odkaz:
http://arxiv.org/abs/2212.12405
Autor:
Pešta, Milan, Pejcha, Ondřej
Publikováno v:
A&A 672, A176 (2023)
The mass ratio $q$ of a contact binary star evolves due to mass transfer, magnetic braking, and thermal relaxation oscillations to small values until it crosses a critical threshold $q_\text{min}$. When that happens, the binary undergoes the tidal Da
Externí odkaz:
http://arxiv.org/abs/2212.02553
Autor:
Landri, Camille, Pejcha, Ondřej, Pawlak, Michał, Udalski, Andrzej, Prieto, Jose L., Barrientos, Manuel, Strader, Jay, Dong, Subo
We present the analysis of existing optical photometry and new optical spectroscopy of the candidate cataclysmic variable star OGLE-BLG504.12.201843. As was shown previously, this object has an orbital period of 0.523419 days and exhibits year-long o
Externí odkaz:
http://arxiv.org/abs/2210.01141
Autor:
Pejcha, Ondřej, Cagaš, Pavel, Landri, Camille, Fausnaugh, Michael M., De Rosa, Gisella, Prieto, Jose L., Henzl, Zbyněk, Pešta, Milan
Publikováno v:
A&A 667, A53 (2022)
CzeV343 (=V849 Aur) was previously identified as a candidate double eclipsing binary (2+2 quadruple), where the orbital periods of the two eclipsing binaries ($P_A \approx 1.2$ days and $P_B \approx 0.8$ days) lie very close to 3:2 resonance. Here, w
Externí odkaz:
http://arxiv.org/abs/2206.12456