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arXiv 1002.1246astro-ph.SRastro-ph.EP
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潮汐对褐矮星的影响:食双星2 MASSJ 05352184 -0546085的应用-潮汐加热背景下的异常温度反转

Tidal effects on brown dwarfs: Application to the eclipsing binary 2MASSJ05352184-0546085 - The anomalous temperature reversal in the context of tidal heating

René Heller, Brian Jackson, Rory Barnes, Richard Greenberg, Derek Homeier

摘要:

2 MASSJ 05352184 -0546085(2 M0535 -05)是唯一已知的食褐矮星(BD)双星,因此可能是BD形成和演化模型的重要基准。然而,对系统性质的理论预测似乎与观测不一致:i.观察到质量较大的(主要)组分比质量较小的(次要)组分温度低。二.次级比预期更亮(大约10^{24} W)。我们研究了潮汐加热的影响,这两个组件的能量收支。我们还比较了各种合理的潮汐模型,以确定一系列的预测属性。我们应用两个版本的两个不同的,众所周知的潮汐相互作用模型,分别为:(i)。“恒定相位滞后”模型和(ii.)的“恒定时间滞后”模式,并把预测的潮汐加热到BD结构的模式。我们发现,在2 M0535 -05中潮汐的热量的贡献可能只大到足以解释观测和理论之间的差异,在一个不太可能的区域的参数空间。BD的潮汐品质因数Q_{BD}必须为10^{3.5},次级需要大于50度的自旋-轨道偏差。然而,2 M0535 -05的潮汐同步时间尺度将潮汐耗散函数Q_{BD}限制为大于10^{4.5}的值,并排除了2 M0535 -05中的强烈潮汐加热。我们提供了Q_{BD}的第一个约束。潮汐加热本身不太可能是2 M0535 -05内令人惊讶的温度逆转的原因。但是,潮汐效应的演化嵌入和与BD的结构演化的耦合处理是必要的,以证实或反驳这一结果。

英文摘要:

2MASSJ05352184-0546085 (2M0535-05) is the only known eclipsing brown dwarf (BD) binary, and so may serve as an important benchmark for models of BD formation and evolution. However, theoretical predictions of the system's properties seem inconsistent with observations: i. The more massive (primary) component is observed to be cooler than the less massive (secondary) one. ii. The secondary is more luminous (by roughly 10^{24} W) than expected. We study the impact of tidal heating to the energy budget of both components. We also compare various plausible tidal models to determine a range of predicted properties. We apply two versions of two different, well-known models for tidal interaction, respectively, (i.) the 'constant-phase-lag' model and (ii.) the 'constant-time-lag' model, and incorporate the predicted tidal heating into a model of BD structure. We find that the contribution of heat from tides in 2M0535-05 alone may only be large enough to account for the discrepancies between observation and theory in an unlikely region of the parameter space. The tidal quality factor of BDs, Q_{BD}, would have to be 10^{3.5} and the secondary needs a spin-orbit misalignment greater than 50 degrees. However, tidal synchronization time scales for 2M0535-05 restrict the tidal dissipation function Q_{BD} to values greater than 10^{4.5} and rule out intense tidal heating in 2M0535-05. We provide the first constraint on Q_{BD}. Tidal heating alone is unlikely to be responsible for the surprising temperature reversal within 2M0535-05. But an evolutionary embedment of tidal effects and a coupled treatment with the structural evolution of the BDs is necessary to corroborate or refute this result.

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