TESS Hunt for Young and Maturing Exoplanets (THYME). VI. An 11 Myr Giant Planet Transiting a Very-low-mass Star in Lower Centaurus Crux-猫眼课题宝

DOI：

10.3847/1538-3881/ac511d

发表时间：

2021-10

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：

A. Mann;M. Wood;Stephen P. Schmidt;Madyson G. Barber;J. Owen;B. Tofflemire;E. Newton;E. Mamajek;Jonathan L. Bush;G. Mace;A. Kraus;P. C. Thao;A. Vanderburg;J. Llama;C. Johns–Krull;L. Prato;Asa G. Stahl;S. Tang;M. J. Fields;K. Collins;K. Collins;T. Gan;E. Jensen;Jacob Kamler;R. Schwarz;E. Furlan;C. Gnilka;S. Howell;K. Lester;Dylan A. Owens;O. Suárez;D. Mékarnia;T. Guillot;L. Abe;A. Triaud;Marshall C. Johnson;Reilly P. Milburn;A. Rizzuto;S. Quinn;R. Kerr;G. Ricker;R. Vanderspek;D. Latham;S. Seager;J. Winn;J. Jenkins;N. Guerrero;Avi Shporer;J. Schlieder;B. McLean;B. Wohler

据预测，成熟的超级地球和亚海王星在10英里以下时将是≃木星半径。因此，我们预计会在年轻恒星周围发现5-15颗R-⊕行星，即使年长的恒星上没有行星。我们报道了TOI1227b的发现和验证，它是一颗0.85±0.05RJ(9.5R⊕)的行星，每27.4d凌日一颗极低质量恒星(0.170±0.015 M⊙)。TOI1227‘S运动学和强烈的锂吸收证实它是先前发现的下半人马座Crux OB群中的一个亚群的成员，我们将其命名为Musca群。根据锂离子、旋光度和蝇类成员的颜色-星等图，我们推算出蝇类的年龄为11±2Myr。TESS数据和地面跟踪显示，凌日深度(2.5%)。我们使用多波长凌日观测和来自IGRINS光谱仪的径向速度来验证该信号是否为行星性质，我们获得了≃0.5MJ的行星质量上限。由于如此大型的行星在成熟的低质量恒星周围非常罕见，我们认为TOI1227b仍在收缩，并最终将转变为更常见的&lt；5R⊕行星之一。

Mature super-Earths and sub-Neptunes are predicted to be ≃ Jovian radius when younger than 10 Myr. Thus, we expect to find 5–15 R ⊕ planets around young stars even if their older counterparts harbor none. We report the discovery and validation of TOI 1227b, a 0.85 ± 0.05 R J (9.5 R ⊕) planet transiting a very-low-mass star (0.170 ± 0.015 M ⊙) every 27.4 days. TOI 1227's kinematics and strong lithium absorption confirm that it is a member of a previously discovered subgroup in the Lower Centaurus Crux OB association, which we designate the Musca group. We derive an age of 11 ± 2 Myr for Musca, based on lithium, rotation, and the color–magnitude diagram of Musca members. The TESS data and ground-based follow-up show a deep (2.5%) transit. We use multiwavelength transit observations and radial velocities from the IGRINS spectrograph to validate the signal as planetary in nature, and we obtain an upper limit on the planet mass of ≃0.5 M J. Because such large planets are exceptionally rare around mature low-mass stars, we suggest that TOI 1227b is still contracting and will eventually turn into one of the more common <5 R ⊕ planets.

TESS Hunt for Young and Maturing Exoplanets (THYME). VI. An 11 Myr Giant Planet Transiting a Very-low-mass Star in Lower Centaurus Crux

文献摘要

相似文献