TOI-908: a planet at the edge of the Neptune desert transiting a G-type star

TOI-908: a planet at the edge of the Neptune desert transiting a G-type star
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TOI-908:海王星沙漠边缘的一颗行星,正在穿越 G 型恒星

DOI:
10.1093/mnras/stad1840
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发表时间:
2023
影响因子:
4.8
通讯作者:
Hawthorn F
Hawthorn F
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Hawthorn F

文献摘要

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我们提出了一颗通过TOI-908 (TIC-350153977)的系外行星的发现,使用的数据来自mess1、12、13、27、28和39扇区。TOI-908是一颗aT= 10.7等(Teff= 5626±61 K)的类太阳矮星,质量为0.950±0.010 M⊙,半径为1.028±0.030 R⊙。这颗行星,TOI-908 b,是一个3.18±0.16 R的行星,在3.18 d的轨道上运行。harps的径向速度测量显示TOI-908 b的质量约为16.1±4.1 M⊕,因此行星的总体密度为g cm−3。TOI-908 b位于一个被称为海王星沙漠的人烟稀少的参数空间区域。这颗行星可能在经历了来自其主恒星的x射线和极端紫外线辐射的显著光蒸发之前,作为一颗亚土星行星开始了它的生命,并可能继续蒸发,失去其残余包层质量的很大一部分。
We present the discovery of an exoplanet transiting TOI-908 (TIC-350153977) using data fromTESSsectors 1, 12, 13, 27, 28, and 39. TOI-908 is aT= 10.7 mag G-dwarf (Teff=  5626 ± 61 K) solar-like star with a mass of 0.950 ± 0.010 M⊙and a radius of 1.028 ± 0.030 R⊙. The planet, TOI-908 b, is a 3.18 ± 0.16 R⊕planet in a 3.18 d orbit. Radial velocity measurements fromHARPSreveal TOI-908 b has a mass of approximately 16.1 ± 4.1 M⊕, resulting in a bulk planetary density ofg cm−3. TOI-908 b lies in a sparsely populated region of parameter space known as the Neptune desert. The planet likely began its life as a sub-Saturn planet before it experienced significant photoevaporation due to X-rays and extreme ultraviolet radiation from its host star, and is likely to continue evaporating, losing a significant fraction of its residual envelope mass.