ABSTRACT Jetted astrophysical phenomena with black hole engines, including binary mergers, jetted tidal disruption events, and X-ray binaries, require a large-scale vertical magnetic field for efficient jet formation. However, dynamo mechanism that could generate these crucial fields has not been identified characterized. We have employed three-dimensional global general relativistic magnetohydrodynamical simulations of accretion discs to quantify, the first time, generates fields. This...

Abstract Quasars are powered by supermassive black hole (SMBH) accretion disks, yet standard thin disk models inconsistent with many observations. Recently, P. F. Hopkins et al. simulated the formation of a quasar feeding an SMBH mass M = 1.3 × 10 7 ⊙ in galaxy. The had surprisingly strong toroidal magnetic fields that supported it vertically from gravity and rapid accretion. What feedback can such system produce? To answer this, we must follow gas to event horizon. For interpolated into...

Abstract We present the first numerical simulations that track evolution of a black hole–neutron star (BH–NS) merger from premerger to r ≳ 10 11 cm. The disk forms after mass ratio q = 2 ejects massive winds (3–5 × −2 M ⊙ ). introduce various postmerger magnetic configurations and find initial poloidal fields lead jet launching shortly merger. maintains constant power due constancy large-scale BH flux until becomes magnetically arrested (MAD), where falls off as L j ∼ t . All jets inevitably...

Abstract The angular momentum of gas feeding a black hole (BH) may be misaligned with respect to the BH spin, resulting in tilted accretion disk. Rotation drags surrounding spacetime, manifesting as Lense–Thirring torques that lead disk precession and warping. We study these processes by simulating thin ( H / r = 0.02), highly <?CDATA ${ \mathcal T }=65^\circ $?> <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" overflow="scroll"> <mml:mi mathvariant="italic"></mml:mi>...

Abstract Spinning supermassive black holes (BHs) in active galactic nuclei magnetically launch relativistic collimated outflows, or jets. Without angular momentum supply, such jets are thought to perish within 3 orders of magnitude distance from the BH, well before reaching kiloparsec scales. We study survival at largest scale separation date, via 3D general magnetohydrodynamic simulations rapidly spinning BHs immersed into uniform zero-angular-momentum gas threaded by a weak vertical...

Abstract The conventional accretion disk lore is that magnetized turbulence the principal angular momentum transport process drives accretion. However, when dynamically important large-scale magnetic fields thread an disk, they can produce mass and outflows, known as winds , also drive Yet, relative importance of turbulent wind-driven still poorly understood. To probe this question, we analyze a long-duration (1.2 × 10 5 r g / c ) simulation rapidly rotating ( = 0.9) black hole feeding from...

Context. Astrophysical disks are likely embedded in an ambient vertical magnetic field generated by its environment. This is known to drive magneto-rotational turbulence the disk bulk, but it also responsible for launching magnetised outflows at origin of astrophysical jets. Yet, interplay between and not understood. In particular, structure long-term (secular) evolution such a system lack quantitative predictions. It is, nevertheless, this secular which proposed explain time variability...

Abstract Black hole (BH) spin can play an important role in galaxy evolution by controlling the amount of energy and momentum ejected from near BH into surroundings. We focus on radiatively inefficient geometrically thick magnetically arrested disks (MADs) that launch strong BH-powered jets. With appropriately chosen adiabatic index, these systems describe either low-luminosity or highly super-Eddington accretion regimes. Using a suite 3D general relativistic magnetohydrodynamic simulations,...

Abstract The spin of a newly formed black hole (BH) at the center massive star evolves from its natal value due to two competing processes: accretion gas angular momentum that increases and extraction BH by outflows decreases spin. Ultimately, final, equilibrium is set balance between both processes. In order for launch relativistic jets power γ -ray burst (GRB), magnetic field needs be dynamically important. Thus, we consider case magnetically arrested disk (MAD) driving evolution BH. By...

Collapsing stars constitute the main black hole (BH) formation channel, and are occasionally associated with launch of relativistic jets that power $ \gamma $-ray bursts (GRBs). Thus, collapsars offer an opportunity to infer natal (before spin-up/down by accretion) BH spin directly from observations. We show once saturates large-scale magnetic flux, jet is dictated mass accretion rate. Core-collapse simulations Halevi et al. 2023 GRB observations favor stellar density profiles yield rate...

Collapsars -- massive stars whose cores promptly collapse into black holes (BHs) can power long-duration gamma-ray bursts (LGRBs) via relativistic, collimated, electromagnetically-driven outflows, or jets. Their depends on the BH magnetic field strength and spin. To survive infalling stellar material, jets need central to attain dynamically important fields that suppress mass inflow lead a magnetically arrested disk (MAD). Previous work found non-radiative MADs spin down their BHs an...

Semi-analytical models of disk outflows have successfully described magnetically-driven, self-confined super-Alfv\'enic jets from near Keplerian accretion disks. These Jet Emitting Disks are possible for high levels magnetization $\mu$ defined as $\mu=2/\beta$ where beta is the usual plasma parameter. In near-equipartition JEDs, supersonic and carry away most angular momentum. However, these solutions prove difficult to compare with cutting edge numerical simulations, reason that simulations...

Abstract Rotating outflows from protostellar disks might trace extended magnetohydrodynamic (MHD) disk winds (DWs), providing a solution to the angular momentum problem in accretion for star formation. In jet system HH 212, rotating outflow was detected SO around an episodic SiO. Here we spatially resolve this into three components: collimated aligned with SiO jet, wide-angle outflow, and evacuated cavity between created by large jet-driven bow shock. Although it theoretically predicted, is...

Abstract Disk-fed accretion onto neutron stars can power a wide range of astrophysical sources ranging from X-ray binaries, to accretion-powered millisecond pulsars, ultraluminous sources, and gamma-ray bursts. A crucial parameter controlling the gas–magnetosphere interaction is strength stellar dipole. In addition, coherent pulsations in many star systems indicate that star's dipole moment oblique relative its rotation axis. Therefore, it critical systematically explore 2D space magnetic...

Upcoming LIGO/Virgo/KAGRA (LVK) observing runs are expected to detect a variety of inspiralling gravitational-wave (GW) events, that come from black-hole and neutron-star binary mergers. Detection non-inspiral GW sources is also anticipated. We report the discovery new class - end states massive stars can produce brightest simulated stochastic burst signal in LVK bands known date, could be detectable run A+. Some dying launch bipolar relativistic jets, which inflate turbulent energetic...

Abstract We use an analytic framework to calculate the evolution of binary orbits under a physically motivated model that accounts for angular momentum loss associated with winds from accretion disk around compact-objected accretor. Our prescription considers wind mass ejection surface disk, accounting radial mass-loss dependence across surface. compare this standard isotropic vicinity The is always larger. For ratios, q , between 2 and 10, via can be ≃3–40 times greater than prescription....

Abstract The ongoing LIGO–Virgo–KAGRA observing run O4 provides an opportunity to discover new multimessenger events, including binary neutron star (BNS) mergers such as GW170817 and the highly anticipated first detection of a black hole–neutron (BH–NS) merger. While BNS were predicted exhibit early optical emission from mildly relativistic outflows, it has remained uncertain whether BH–NS merger ejecta conditions for similar signals emerge. We present modeling near-ultraviolet/optical...

Dwarf novae (DNe) and low mass X-ray binaries (LMXBs) show eruptions that are thought to be due a thermal-viscous instability in their accretion disk. These provide constraints on angular momentum transport mechanisms. We explore the idea could controlled by dynamical evolution of large scale magnetic field. study impact different prescriptions for field dynamics This is first step confronting theory with observations. develop version disk model evolves density, temperature vertical flux...

In our self-similar, analytical, magneto-hydrodynamic (MHD) accretion-ejection solution, the density at base of outflow is explicitly dependent on disk accretion rate - a unique property this class solutions. We had earlier found that ejection index $p >\sim 0.1 (\dot{M}_{acc} \propto r^p ) $ key MHD parameter decides if flow can cause absorption lines in high resolution X-ray spectra black hole binaries. Here we choose 3 dense warm solutions with = 0.1, 0.3, 0.45$ and carefully develop...

Context. Observations of blue-shifted X-ray absorption lines indicate the presence wind from accretion disc in binaries. Magnetohydrodynamic (MHD) driving is one possible wind-launching mechanism. Recent theoretical developments have made self-similar magnetic accretion-ejection solutions much more generalised, showing that can be launched at a lower magnetisation than equipartition value, which had previously been only possibility. Aims. In this work, we model transmitted spectra through...

Black hole (BH) spin can play an important role in galaxy evolution by controlling the amount of energy and momentum ejected from near BH into surroundings. We focus on radiatively-inefficient geometrically-thick magnetically-arrested disks (MADs) that launch strong BH-powered jets. With appropriately chosen adiabatic index, these systems describe either low-luminosity or highly super-Eddington accretion regimes. Using a suite 3D general relativistic magnetohydrodynamic (GRMHD) simulations,...

Observation of blue-shifted X-ray absorption lines indicates the presence wind from accretion disk in binaries. Magnetohydrodynamic (MHD) driving is one possible launching mechanisms. Recent theoretical development makes magnetic accretion-ejection self-similar solutions much more generalized, and can be launched even at lower magnetization compared to equipartition value, which was only possibility beforehand. Here, we model transmitted spectra through MHD driven photoionized - models have...

Context. Jets are launched from many classes of astrophysical objects, including post-asymptotic giant branch (post-AGB) binaries with a circumbinary disc. Despite dozens detections, the formation these post-AGB binary jets and their connection to inter-component interactions in host systems remains poorly understood. Aims. Building upon previous paper this series, we consider cold self-similar magnetohydrodynamic (MHD) disc wind solutions describe that circumcompanion accretion discs...

Quasars are powered by supermassive black hole (SMBH) accretion disks, yet standard disk models inconsistent with many quasar observations. Recently, Hopkins et al. (2024) simulated the formation of a feeding SMBH mass $M=1.3\times10^7\,M_\odot$ in host galaxy that evolved from cosmological initial conditions. The had surprisingly strong toroidal magnetic fields supported it vertically gravity and fast accretion. What radiation feedback can such system produce? To answer this, we must follow...

Collapsars - rapidly rotating stellar cores that form black holes (BHs) can power gamma-ray bursts (GRBs) and are proposed to be key contributors the production of heavy elements in Universe via rapid neutron capture process ($r$-process). Previous neutrino-transport collapsar simulations have been unable unbind neutron-rich material from disk. However, these not included magnetic fields or BH, both which essential for launching mass outflows. We present $\nu$H-AMR, a novel general...