Simultaneous Spectral Energy Distribution and Near-infrared Interferometry Modeling of HD 142666
| Autor: | David M. Acreman, Laszlo Sturmann, T. ten Brummelaar, Fabien Baron, Stefan Kraus, Judit Sturmann, John D. Monnier, Alexander Kreplin, Tim J. Harries, Rafael Millan-Gabet, Aaron Labdon, Claire L. Davies, Brian Kloppenborg |
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| Rok vydání: | 2018 |
| Předmět: |
Astrophysics::High Energy Astrophysical Phenomena
FOS: Physical sciences Astrophysics Astrophysics::Cosmology and Extragalactic Astrophysics 01 natural sciences 010305 fluids & plasmas law.invention law 0103 physical sciences Radiative transfer Astrophysics::Solar and Stellar Astrophysics 010303 astronomy & astrophysics Solar and Stellar Astrophysics (astro-ph.SR) Astrophysics::Galaxy Astrophysics Physics Near-infrared spectroscopy Astronomy and Astrophysics Scale height Position angle Interferometry Astrophysics - Solar and Stellar Astrophysics Space and Planetary Science Closure phase Spectral energy distribution Astrophysics::Earth and Planetary Astrophysics Hydrostatic equilibrium |
| Zdroj: | The Astrophysical Journal |
| ISSN: | 1538-4357 0004-637X 1538-3881 1538-3873 0067-0049 0035-8738 0004-6361 |
| DOI: | 10.3847/1538-4357/aade51 |
| Popis: | We present comprehensive models of Herbig Ae star, HD 142666, which aim to simultaneously explain its spectral energy distribution (SED) and near-infrared (NIR) interferometry. Our new sub-milliarcsecond resolution CHARA (CLASSIC and CLIMB) interferometric observations, supplemented with archival shorter baseline data from VLTI/PIONIER and the Keck Interferometer, are modeled using centro-symmetric geometric models and an axisymmetric radiative transfer code. CHARA's 330 m baselines enable us to place strong constraints on the viewing geometry, revealing a disk inclined at 58 degrees from face-on with a 160 degree major axis position angle. Disk models imposing vertical hydrostatic equilibrium provide poor fits to the SED. Models accounting for disk scale height inflation, possibly induced by turbulence associated with magneto-rotational instabilities, and invoking grain growth to >1 micron size in the disk rim are required to simultaneously reproduce the SED and measured visibility profile. However, visibility residuals for our best model fits to the SED indicate the presence of unexplained NIR emission, particularly along the apparent disk minor axis, while closure phase residuals indicate a more centro-symmetric emitting region. In addition, our inferred 58 degree disk inclination is inconsistent with a disk-based origin for the UX Ori-type variability exhibited by HD 142666. Additional complexity, unaccounted for in our models, is clearly present in the NIR-emitting region. We propose the disk is likely inclined toward a more edge-on orientation and/or an optically thick outflow component also contributes to the NIR circumstellar flux. Accepted for publication in The Astrophysical Journal |
| Databáze: | OpenAIRE |
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