A multi-dimensional view of a unified model for TDEs
arXiv:2408.16371 · doi:10.1093/mnras/staf880
Abstract
Tidal disruption events (TDEs) can generate non-spherical, relativistic and optically thick outflows. Simulations show that the radiation we observe is reprocessed by these outflows. According to a unified model suggested by these simulations, the spectral energy distributions (SEDs) of TDEs depend strongly on viewing angle: low [high] optical-to-X-ray ratios (OXRs) correspond to face-on [edge-on] orientations. Post-processing with radiative transfer codes have simulated the emergent spectra, but have so far been carried out only in a quasi-1D framework, with three atomic species (H, He and O). Here, we present 2.5D Monte Carlo radiative transfer simulations which model the emission from a non-spherical outflow, including a more comprehensive set of cosmically abundant species. While the basic trend of OXR increasing with inclination is preserved, the inherently multi-dimensional nature of photon transport through the non-spherical outflow significantly affects the emergent SEDs. Relaxing the quasi-1D approximation allows photons to preferentially escape in (polar) directions of lower optical depth, resulting in a greater variation of bolometric luminosity as a function of inclination. According to our simulations, inclination alone may not fully explain the large dynamic range of observed TDE OXRs. We also find that including metals, other than Oxygen, changes the emergent spectra significantly, resulting in stronger absorption and emission lines in the extreme ultraviolet, as well a greater variation in the OXR as a function of inclination. Whilst our results support previously proposed unified models for TDEs, they also highlight the critical importance of multi-dimensional ionization and radiative transfer.
18 pages, 15 figures. Accepted by MNRAS
References in corpus (51)
- SciPy 1.0--Fundamental Algorithms for Scientific Computing in Python
- Optical Flares from the Tidal Disruption of Stars by Massive Black Holes
- An ultraviolet-optical flare from the tidal disruption of a helium-rich stellar core
- A Continuum of H- to He-Rich Tidal Disruption Candidates With a Preference for E+A Galaxies
- Tidal Disruption Events
- Seventeen Tidal Disruption Events from the First Half of ZTF Survey Observations: Entering a New Era of Population Studies
- A unified model for tidal disruption events
- Time Dependent Monte Carlo Radiative Transfer Calculations For 3-Dimensional Supernova Spectra, Lightcurves, and Polarization
- General Relativistic Hydrodynamic Simulation of Accretion Flow from a Stellar Tidal Disruption
- Atomic Data for Permitted Resonance Lines of Atoms and Ions from H to Si, and S, Ar, Ca and Fe
- A Bright Year for Tidal Disruptions?
- Radiation-Dominated Disks Are Thermally Stable
- Disc formation from tidal disruptions of stars on eccentric orbits by Schwarzschild black holes
- The X-ray through Optical Fluxes and Line Strengths of Tidal Disruption Events
- Flows of X-ray gas reveal the disruption of a star by a massive black hole
- Radio Properties of Tidal Disruption Events
- Circularization of Tidally Disrupted Stars around Spinning Supermassive Black Holes
- Optical-Ultraviolet Tidal Disruption Events
- Soft X-ray Temperature Tidal Disruption Events from Stars on Deep Plunging Orbits
- Late-time UV observations of tidal disruption flares reveal unobscured, compact accretion disks
- Evolution of Accretion Disks in Tidal Disruption Events
- An outflow powers the optical rise of the nearby, fast-evolving tidal disruption event AT2019qiz
- On the Thermal Stability of Radiation Dominated Accretion Disks
- Line-driven Disk Winds in Active Galactic Nuclei: The Critical Importance of Ionization and Radiative Transfer
- Modeling the Spectral Signatures of Accretion Disk Winds: A New Monte Carlo Approach
- Monte Carlo transition probabilities
- The Broad Absorption Line Tidal Disruption Event iPTF15af: Optical and Ultraviolet Evolution
- Monte Carlo transition probabilities. II
- A likely decade-long sustained tidal disruption event
- Measuring stellar and black hole masses of tidal disruption events
- Ultrafast Outflow in Tidal Disruption Event ASASSN-14li
- What Sets the Line Profiles in Tidal Disruption Events?
- GRRMHD Simulations of Tidal Disruption Event Accretion Disks around Supermassive Black Holes: Jet Formation, Spectra, and Detectability
- The Impact of Accretion Disk Winds on the Optical Spectra of Cataclysmic Variables
- Effects of Downscattering on the Continuum and Line Spectra in Powerful Wind Environment. Monte Carlo Simulations, Analytical Results and Data Analysis
- Monte Carlo Radiation Hydrodynamics with Implicit Methods
- Testing Quasar Unification: Radiative Transfer in Clumpy Winds
- Discovery of Highly Blueshifted Broad Balmer and Metastable Helium Absorption Lines in a Tidal Disruption Event
- A Simple Disk Wind Model for Broad Absorption Line Quasars
- X-ray properties of TDEs
- Wind-reprocessed Transients
- Super-Eddington Accretion in Tidal Disruption Events: the Impact of Realistic Fallback Rates on Accretion Rates
- General Overview of Black Hole Accretion Theory
- First light from tidal disruption events
- On the Missing Energy Puzzle of Tidal Disruption Events
- 2-D Monte Carlo simulations of H I line formation in massive YSO disk winds
- Optical line spectra of tidal disruption events from reprocessing in optically thick outflows
- From X-rays to physical parameters: a comprehensive analysis of thermal tidal disruption event X-ray spectra
- SIROCCO: A Publicly Available Monte Carlo Ionization and Radiative Transfer Code for Astrophysical Outflows
- Optical/UV Emission in the Tidal Disruption Event ASASSN-14li: Implications of Disc Modeling
- Sub-relativistic Outflow and Hours-Timescale Large-amplitude X-ray Dips during Super-Eddington Accretion onto a Low-mass Massive Black Hole in the Tidal Disruption Event AT2022lri