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arXiv 2401.05047astro-ph.EP
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11 Myr 系外行星 TOI-1227 b 存在凌星计时变化的证据

Evidence for transit-timing variations of the 11 Myr exoplanet TOI-1227 b

J. M. Almenara, X. Bonfils, T. Guillot, M. Timmermans, R. F. Díaz, J. Venturini, A. C. Petit, T. Forveille, O. Suarez, D. Mekarnia, A. H. M. J. Triaud, L. Abe, … 展开作者

J. M. Almenara, X. Bonfils, T. Guillot, M. Timmermans, R. F. Díaz, J. Venturini, A. C. Petit, T. Forveille, O. Suarez, D. Mekarnia, A. H. M. J. Triaud, L. Abe, P. Bendjoya, F. Bouchy, J. Bouvier, L. Delrez, G. Dransfield, E. Ducrot, M. Gillon, M. J. Hooton, E. Jehin, A. W. Mann, R. Mardling, F. Murgas, A. Leleu, M. Lendl, D. Queloz, S. Seager, J. Winn, S. Zuñiga Fernández

AI总结:

本研究通过多望远镜观测证实 11 Myr 系外行星 TOI-1227 b 存在显著凌星计时变化,推测源于与其他行星的动力学相互作用,并进一步验证了其行星属性。

摘要:

TOI-1227 b 是一颗 11 Myr 的已验证凌星行星,正处于收缩阶段中期,当前半径为 0.85 R$_J$。它围绕一颗低质量的前主序星(0.170 M$_\odot$,0.56 R$_\odot$)运行,轨道周期为 27.4 天。其年轻宿主恒星的磁活动引发了径向速度抖动,导致无法精确测量行星质量。我们利用天基和地基望远镜收集了 TOI-1227 b 的额外凌星观测数据,并检测到具有高度显著性的凌星计时变化(TTVs)。其振幅约为 40 分钟,主导时间尺度长于 3.7 年。其最可能的起源是系统内与其他行星的动力学相互作用。我们利用接近一阶和二阶共振的内、外摄动体对 TTVs 进行了建模;多种轨道构型均能提供可接受的拟合。需要更多数据来确定实际的轨道构型并最终测量行星质量。这些 TTVs 及更新的凌星色度分析进一步证实了 TOI-1227 b 是一颗行星。

英文摘要:

TOI-1227 b is an 11 Myr old validated transiting planet in the middle of its contraction phase, with a current radius of 0.85 R$_J$. It orbits a low-mass pre-main sequence star (0.170 M$_\odot$, 0.56 R$_\odot$) every 27.4 days. The magnetic activity of its young host star induces radial velocity jitter and prevents good measurements of the planetary mass. We gathered additional transit observations of TOI-1227 b with space- and ground-based telescopes, and we detected highly significant transit-timing variations (TTVs). Their amplitude is about 40 minutes and their dominant timescale is longer than 3.7 years. Their most probable origin is dynamical interactions with additional planets in the system. We modeled the TTVs with inner and outer perturbers near first and second order resonances; several orbital configurations provide an acceptable fit. More data are needed to determine the actual orbital configuration and eventually measure the planetary masses. These TTVs and an updated transit chromaticity analysis reinforce the evidence that TOI-1227 b is a planet.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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