An In-depth Look at TOI-3884b: A Super-Neptune Transiting an M4Dwarf with Persistent Starspot Crossings-猫眼课题宝

DOI：

10.3847/1538-3881/accc2f

发表时间：

2023-02

期刊：

The Astronomical Journal

影响因子：

通讯作者：

中科院分区：

其他

文献类型：

作者：

J. Libby-Roberts;Mary C. Schutte;L. Hebb;S. Kanodia;C. Cañas;G. Stefansson;Andrea S. J. Lin;S. Mahadevan;Winter Parts(they/them)-Winter-Parts(they-them)-2218517096;Luke Powers;J. Wisniewski;C. Bender;W. Cochran;S. Diddams;M. Everett;Arvind F. Gupta;S. Halverson;H. Kobulnicky;A. Kowalski;Alexander Larsen;A. Monson;J. Ninan;B. Parker;L. Ramsey;Paul Robertson;C. Schwab;T. Swaby;R. Terrien

我们对最近证实的TOI-3884系统进行了深入的分析，TOI-3884系统是一颗M4矮星，具有凌日的超级海王星。利用3.5m的阿帕奇点天文台获得的高精度光曲线和宜居带行星探测器的径向速度观测，我们得到行星质量为32.6R7.4+7.3M−，半径为6.4±0.2R⊕。我们探测到一个明显的恒星黑子穿越事件发生在进入之后，每次凌日跨越一半的时间。我们确定这个斑点特征与波长有关，其幅度和持续时间随着时间的推移而略有变化。最佳拟合的恒星黑子模型表明，TOI-3884b的轨道有一个错位(λ=75°±10°)穿过一个巨大的极黑子。这个系统提供了一个难得的机会，既可以研究错位的超级海王星的性质，也可以研究活跃的中M矮星上的黑子演化。

We perform an in-depth analysis of the recently validated TOI-3884 system, an M4-dwarf star with a transiting super-Neptune. Using high-precision light curves obtained with the 3.5 m Apache Point Observatory and radial velocity observations with the Habitable-zone Planet Finder, we derive a planetary mass of 32.6−7.4+7.3M⊕ and radius of 6.4 ± 0.2 R ⊕. We detect a distinct starspot crossing event occurring just after ingress and spanning half the transit for every transit. We determine this spot feature to be wavelength dependent with the amplitude and duration evolving slightly over time. Best-fit starspot models show that TOI-3884b possesses a misaligned (λ = 75° ± 10°) orbit that crosses a giant pole spot. This system presents a rare opportunity for studies into the nature of both a misaligned super-Neptune and spot evolution on an active mid-M dwarf.

An In-depth Look at TOI-3884b: A Super-Neptune Transiting an M4Dwarf with Persistent Starspot Crossings

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