Semileptonic and nonleptonic decays of B c

Иванов, М. А.; Körner, Jürgen; Santorelli, Pietro

doi:10.1007/978-88-470-0530-3_43

Cited by 14 publications

(16 citation statements)

References 41 publications

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“…However, in this context we note that the current orbital period of Kepler-91b is large enough that such tides may not have operated significantly during the life time of the star (see eg. Ivanov & Papaloizou 2007. Note that for slightly larger and slightly smaller initial orbital periods the evolution would be qualitatively different.…”

Section: Evolved Starsmentioning

confidence: 92%

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Dynamical tides in exoplanetary systems containing hot Jupiters: confronting theory and observations

Чернов

Ivanov

Papaloizou

2017

Monthly Notices of the Royal Astronomical Society

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We study the effect of dynamical tides associated with the excitation of gravity waves in an interior radiative region of the central star on orbital evolution in observed systems containing Hot Jupiters. We consider WASP-43, Ogle-tr-113, WASP-12, and WASP-18 which contain stars on the main sequence (MS). For these systems there are observational estimates regarding the rate of change of the orbital period. We also investigate Kepler-91 which contains an evolved giant star. We adopt the formalism of Ivanov et al. for calculating the orbital evolution.For the MS stars we determine expected rates of orbital evolution under different assumptions about the amount of dissipation acting on the tides, estimate the effect of stellar rotation for the two most rapidly rotating stars and compare results with observations. All cases apart from possibly WASP-43 are consistent with a regime in which gravity waves are damped during their propagation over the star. However, at present this is not definitive as observational errors are large. We find that although it is expected to apply to Kepler-91, linear radiative damping cannot explain this dissipation regime applying to MS stars. Thus, a nonlinear mechanism may be needed.Kepler-91 is found to be such that the time scale for evolution of the star is comparable to that for the orbit. This implies that significant orbital circularisation may have occurred through tides acting on the star. Quasi-static tides, stellar winds, hydrodynamic drag and tides acting on the planet have likely played a minor role. Ivanov et al. (2013) (IPCh) determined the tidal response associated with the excitation of a regular dense spectrum of normal modes, such as provided by the low frequency rotationally modified g modes, by a perturbing tidal potential. They obtained expressions from which the orbital evolution could be obtained. These depend on the amount of dissipation present. Two regimes were highlighted. The regime of moderately large damping (MLD) for which the excited waves are damped before reaching an appropriate boundary, the centre for a radiative core, and the surface for a radiative envelope. In this regime the effect on the orbit is independent of the details of the dissipation process. Note that the same assumption of the validity of MLD regime is implied in the well known theory of dynamical tidal interactions of Zahn (1970) and Zahn (1977) which is ⋆

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Section: Evolved Starsmentioning

confidence: 92%

“…During this process tidal dissipation both in the planet and the star can be significant (see e.g. Rasio & Ford 1996;Ivanov & Papaloizou 2007. In the latter case the tidal dissipation may lead to the planet merging with the central star at a later stage of its evolution (e.g.…”

Section: Introductionmentioning

confidence: 99%

Dynamical tides in exoplanetary systems containing hot Jupiters: confronting theory and observations

Чернов

Ivanov

Papaloizou

2017

Monthly Notices of the Royal Astronomical Society

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“…The appropriate energy scale (µ) in our case is µ ≈ m b , providing the following values for a 1,2 [48]:…”

Section: Nonleptonic B S → Csm F Two Meson Decaysmentioning

confidence: 99%

Weak decays ofB¯smesons

Albertus

2014

Phys. Rev. D

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In the present work we study the semileptonic decays ofB s mesons in the context of nonrelativistic constituent quark models. We estimate the uncertainties of our calculation using different interquark potentials to obtain the meson wave functions. We check the results from our model against the predictions of Heavy Quark Symmetry, in the limit of infinite heavy quark mass. We also study the nonleptonic decays ofB s mesons within the factorization approximation.2

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“…Previous work on tidal deformation of a WD orbiting a massive black hole focused on two extreme regimes: (i) weak deformation was studied analytically using perturbation theory (e.g. Rathore, Blandford & Broderick 2005;Ivanov & Papaloizou 2007) and (ii) strong deformation leading to immediate disruption was simulated numerically (e.g. Kobayashi et al 2004; Rosswog, Ramirez-Ruiz C 2010 The Authors.…”

mentioning

confidence: 99%

White dwarfs stripped by massive black holes: sources of coincident gravitational and electromagnetic radiation

Zalamea

Menou

Beloborodov

2010

Monthly Notices of the Royal Astronomical Society: Letters

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White dwarfs inspiralling into black holes of mass MBH≳ 105 M⊙ are detectable sources of gravitational waves in the Laser Interferometer Space Antenna (LISA) band. In many of these events, the white dwarf begins to lose mass during the main observational phase of the inspiral. The mass‐loss starts gently and can last for thousands of orbits. The white dwarf matter overflows the Roche lobe through the L1 point at each pericentre passage and the mass‐loss repeats periodically. The process occurs very close to the black hole and the released gas can accrete, creating a bright source of radiation with luminosity close to the Eddington limit, L∼ 1043 erg s−1. This class of inspirals offers a promising scenario for dual detections of gravitational waves and electromagnetic radiation.

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Semileptonic and nonleptonic decays of B c

Cited by 14 publications

References 41 publications

Dynamical tides in exoplanetary systems containing hot Jupiters: confronting theory and observations

Dynamical tides in exoplanetary systems containing hot Jupiters: confronting theory and observations

Weak decays ofB¯smesons

White dwarfs stripped by massive black holes: sources of coincident gravitational and electromagnetic radiation

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