A multi-wavelength interferometric study of the massive young stellar object IRAS 13481-6124

A multi-wavelength interferometric study of the massive young stellar object IRAS 13481-6124
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大质量年轻恒星 IRAS 13481-6124 的多波长干涉研究

DOI:
10.1051/0004-6361/201527502
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发表时间:
2016
影响因子:
6.5
通讯作者:
Boley P
Boley P
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Boley P

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我们提出了对大质量年轻恒星 IRAS 13481-6124 的新中红外干涉观测,使用 VLTI/MIDI 进行光谱分辨长基线测量(投影基线高达约 120 m),并使用 GSO/T-ReCS 在 5 个窄带滤光片(投影基线约 1.8−6.4 m)的波长范围内进行孔径掩蔽干涉测量。 7.5−13μm。我们将这些测量结果与之前发布的 K 和 N 波段干涉观测结果相结合,以收集迄今为止最大的大规模 YSO 红外干涉观测结果。使用几何和辐射传输模型的组合,我们确认了先前从近红外观测中推断出的圆盘中红外波长的检测。我们表明,流出腔也在近红外和中红外波长下被检测到,并且实际上就总通量而言主导中红外发射。对于圆盘,我们推导出内半径(~1.8 mas 或~6.5 AU,3.6 kpc)、内缘温度(~1760 K)、倾角(~48°)和位置角(~107°)。我们确定,如果没有(亚)毫米范围内的高分辨率观测或对盘运动学的观察,盘的质量就无法受到约束,并且可以在〜10-3到20M⊙之间的任何地方。最后,我们讨论了解释深埋大质量 YSO 光谱能量分布的前景,并警告不要尝试从光谱能量分布推断盘特性。
We present new mid-infrared interferometric observations of the massive young stellar object IRAS 13481-6124, using VLTI/MIDI for spectrally-resolved, long-baseline measurements (projected baselines up to ~120 m) and GSO/T-ReCS for aperture-masking interferometry in five narrow-band filters (projected baselines of ~1.8−6.4 m) in the wavelength range of 7.5−13μm. We combine these measurements with previously-published interferometric observations in theKandNbands in order to assemble the largest collection of infrared interferometric observations for a massive YSO to date. Using a combination of geometric and radiative-transfer models, we confirm the detection at mid-infrared wavelengths of the disk previously inferred from near-infrared observations. We show that the outflow cavity is also detected at both near- and mid-infrared wavelengths, and in fact dominates the mid-infrared emission in terms of total flux. For the disk, we derive the inner radius (~1.8 mas or ~6.5 AU at 3.6 kpc), temperature at the inner rim (~1760 K), inclination (~48°) and position angle (~107°). We determine that the mass of the disk cannot be constrained without high-resolution observations in the (sub-)millimeter regime or observations of the disk kinematics, and could be anywhere from ~10-3to 20M⊙. Finally, we discuss the prospects of interpreting the spectral energy distributions of deeply-embedded massive YSOs, and warn against attempting to infer disk properties from the spectral energy distribution.
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