WASP-12b的神秘内旋：为何倾角潮汐无法驱动轨道衰减
The Mysterious Inspiral of WASP-12b: Why Obliquity Tides Cannot Drive Orbital Decay
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中文总结 AI 辅助
本研究重新评估WASP-12b轨道衰减的倾角潮汐假说，发现所需伴星质量需达65个地球质量，但径向速度观测排除了此类伴星，表明倾角潮汐无法解释其轨道衰减。
中文摘要 AI 辅助
WASP-12b的轨道正在衰减，原因未知。其行星周期缩短的速度快于主序星中平衡潮或动力潮所能解释的范围。行星倾角潮汐可能具有足够的耗散性以驱动WASP-12b的内旋，但同时也会抑制行星的倾角，从而停止衰减。Millholland和Laughlin提出，一颗邻近的低质量行星（约10个地球质量）正在维持WASP-12b的大倾角，从而持续耗散。我们重新评估了这一假设，发现该伴星的质量必须比原先提出的更大（约65个地球质量）才能吸收WASP-12b的轨道角动量。径向速度数据使我们能够排除此类伴星。在3个天文单位内的任何伴星，其K值在95%置信度下小于等于14米/秒。
英文摘要
WASP-12b's orbit is decaying, for unknown reasons. The planet's period is shrinking more rapidly than can be attributed to equilibrium tides or dynamical tides in a main-sequence star. Planetary obliquity tides could be sufficiently dissipative to drive WASP-12b's inspiral, but would also damp the planet's obliquity, halting the decay. Millholland & Laughlin proposed that a nearby, low-mass planet ($\sim 10$ M$_\oplus$) is maintaining a large obliquity for WASP-12b, sustaining the dissipation. We re-evaluated this hypothesis, finding that the companion must be more massive than originally proposed ($\gtrsim 65$ M$_\oplus$) to absorb WASP-12b's orbital angular momentum. Radial velocity data allowed us to rule out a companion of this type. Any companions within $3$ AU have $K \lesssim 14$ m/s at $95$% confidence.
发表机构
- Princeton University（普林斯顿大学）
- University of Toronto（多伦多大学）
机构由 AI 辅助整理，请以论文原文为准。
