Pinwheels in the sky, with dust: 3D modelling of the Wolf–Rayet 98a environment
| Autor: | Rony Keppens, Allard Jan van Marle, Tom Hendrix, Peter Camps, Z. Meliani, Maarten Baes |
|---|---|
| Přispěvatelé: | FOM-Institute for Plasma Physics, FOM, Sterrenkundig Observatorium, Universiteit Gent, Laboratoire Univers et Théories (LUTH (UMR_8102)), Institut national des sciences de l'Univers (INSU - CNRS)-Observatoire de Paris, PSL Research University (PSL)-PSL Research University (PSL)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Université Paris sciences et lettres (PSL)-Université Paris sciences et lettres (PSL)-Centre National de la Recherche Scientifique (CNRS)-Université Paris Diderot - Paris 7 (UPD7) |
| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: |
010504 meteorology & atmospheric sciences
Radiative cooling FOS: Physical sciences EARLY-TYPE STARS Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics 01 natural sciences Photometry (optics) general [binaries] Wolf–Rayet star RADIATIVE-TRANSFER INFRARED PHOTOMETRY 0103 physical sciences Radiative transfer Astrophysics::Solar and Stellar Astrophysics HYDRODYNAMICAL SIMULATIONS Adiabatic process 010303 astronomy & astrophysics Solar and Stellar Astrophysics (astro-ph.SR) Astrophysics::Galaxy Astrophysics ComputingMilieux_MISCELLANEOUS 0105 earth and related environmental sciences Physics [PHYS]Physics [physics] OB star stars [infrared] Astronomy Astronomy and Astrophysics numerical [methods] STELLAR PARAMETERS Dust lane EVOLUTION Wolf-Rayet [stars] Stars Astrophysics - Solar and Stellar Astrophysics Physics and Astronomy Space and Planetary Science radiative transfer hydrodynamics COLLIDING WINDS X-RAY Astrophysics::Earth and Planetary Astrophysics EMISSION [PHYS.ASTR]Physics [physics]/Astrophysics [astro-ph] MASSIVE STARS |
| Zdroj: | Monthly Notices of the Royal Astronomical Society Monthly Notices of the Royal Astronomical Society, Oxford University Press (OUP): Policy P-Oxford Open Option A, 2016, 460 (4), pp.3975-3991. ⟨10.1093/mnras/stw1289⟩ MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY |
| ISSN: | 0035-8711 1365-2966 |
| DOI: | 10.1093/mnras/stw1289⟩ |
| Popis: | The Wolf-Rayet 98a (WR 98a) system is a prime target for interferometric surveys, since its identification as a "rotating pinwheel nebulae", where infrared images display a spiral dust lane revolving with a 1.4 year periodicity. WR 98a hosts a WC9+OB star, and the presence of dust is puzzling given the extreme luminosities of Wolf-Rayet stars. We present 3D hydrodynamic models for WR 98a, where dust creation and redistribution are self-consistently incorporated. Our grid-adaptive simulations resolve details in the wind collision region at scales below one percent of the orbital separation (~4 AU), while simulating up to 1300 AU. We cover several orbital periods under conditions where the gas component alone behaves adiabatic, or is subject to effective radiative cooling. In the adiabatic case, mixing between stellar winds is effective in a well-defined spiral pattern, where optimal conditions for dust creation are met. When radiative cooling is incorporated, the interaction gets dominated by thermal instabilities along the wind collision region, and dust concentrates in clumps and filaments in a volume-filling fashion, so WR 98a must obey close to adiabatic evolutions to demonstrate the rotating pinwheel structure. We mimic Keck, ALMA or future E-ELT observations and confront photometric long-term monitoring. We predict an asymmetry in the dust distribution between leading and trailing edge of the spiral, show that ALMA and E-ELT would be able to detect fine-structure in the spiral indicative of Kelvin-Helmholtz development, and confirm the variation in photometry due to the orientation. Historic Keck images are reproduced, but their resolution is insufficient to detect the details we predict. Accepted for publication in mnras |
| Databáze: | OpenAIRE |
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