Evidence for transit-timing variations of the 11 Myr exoplanet TOI-1227 b
Evidence for transit-timing variations of the 11 Myr exoplanet TOI-1227 b
复制标题
11 Myr 系外行星 TOI-1227 b 凌日时间变化的证据
DOI：
10.1051/0004-6361/202348492
复制
发表时间：
2024
影响因子：
6.5
通讯作者：
Almenara J
中科院分区：
文献类型：
--
作者：
Almenara J
TOI-1227 b是一颗年龄为11myr的经过验证的凌日行星，处于其收缩阶段的中间，电流半径为0.85Rj。它每27.4天绕一颗低质量的主序前恒星（0.170M⊙,0.56R⊙）公转一周。它年轻的主星的磁场活动引起径向速度抖动，妨碍了对行星质量的良好测量。我们利用太空和地面望远镜收集了TOI-1227 b的额外凌日观测数据，并发现了非常显著的凌日时间变化（ttv）。它们的振幅约为40分钟，主要的时间尺度大于3.7年，它们最可能的起源是与系统中其他行星的动力相互作用。我们在一阶和二阶共振附近建立了带有内外扰动的ttv模型；几种轨道结构提供了可接受的匹配。需要更多的数据来确定实际的轨道结构并最终测量行星质量。这些ttv和最新的凌日色度分析强化了TOI-1227 b是一颗行星的证据。
TOI-1227 b is an 11 Myr old validated transiting planet in the middle of its contraction phase, with a current radius of 0.85Rj. It orbits a low-mass pre-main sequence star (0.170M⊙, 0.56R⊙) 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 min and their dominant timescale is longer than 3.7 yr. 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.