Two mini-Neptunes transiting the adolescent K-star HIP 113103 confirmed with TESS and CHEOPS
Two mini-Neptunes transiting the adolescent K-star HIP 113103 confirmed with TESS and CHEOPS
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TESS 和 CHEOPS 确认了两颗迷你海王星凌日青少年 K 星 HIP 113103
DOI：
10.1093/mnras/stad2756
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发表时间：
2024
影响因子：
4.8
通讯作者：
Lowson N
中科院分区：
文献类型：
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作者：
Lowson N
我们报告了在青春期K星HIP 113103（TIC 121490076）周围的近2：1共振轨道（HIP 113103 B的P = 7.610303 d和HIP 113103 c的P = 14.245651 d）中发现的两个迷你海王星。该行星系统最初是由TESSmission确定的，并通过额外的光度和光谱观测得到证实，包括使用ESACHEOPS对两颗行星凌日的17.5小时观测。我们将≤4.5 min和≤2.5 min限制在3年光度基线上不存在凌日时间变化，从而允许对系统轨道偏心率的进一步限制，而不仅仅是从光度凌日持续时间获得的。HIP 113103 B的行星半径为Rp =R，位于半径间隙内，这可能提供关于超级地球和迷你海王星之间形成差异的宝贵信息。由于HIP 113103 c的半径较大，且两颗行星都非常接近HIP 113103，HIP 113103 B可能已经失去（或仍在失去）其原始大气层。因此，我们提出了模拟大气传输光谱的两个行星usingJWST，HST，和闪烁。它表明，潜在的金属丰度差异（由于其演变的差异）将是一个挑战，以检测大气是否处于化学平衡。HIP 113103 B和HIP 113103 c是最明亮的亚海王星行星系统之一，适合大气层追踪，可以为亚海王星K星群的行星演化提供见解。
We report the discovery of two mini-Neptunes in near 2:1 resonance orbits (P = 7.610303 d for HIP 113103 b and P = 14.245651 d for HIP 113103 c) around the adolescent K-star HIP 113103 (TIC 121490076). The planet system was first identified from theTESSmission, and was confirmed via additional photometric and spectroscopic observations, including a ∼17.5 h observation for the transits of both planets using ESACHEOPS. We place ≤4.5 min and ≤2.5 min limits on the absence of transit timing variations over the 3 yr photometric baseline, allowing further constraints on the orbital eccentricities of the system beyond that available from the photometric transit duration alone. With a planetary radius ofRp=R⊕, HIP 113103 b resides within the radius gap, and this might provide invaluable information on the formation disparities between super-Earths and mini-Neptunes. Given the larger radiusRp=R⊕for HIP 113103 c, and close proximity of both planets to HIP 113103, it is likely that HIP 113103 b might have lost (or is still losing) its primordial atmosphere. We therefore present simulated atmospheric transmission spectra of both planets usingJWST, HST, andTwinkle. It demonstrates a potential metallicity difference (due to differences in their evolution) would be a challenge to detect if the atmospheres are in chemical equilibrium. As one of the brightest multi sub-Neptune planet systems suitable for atmosphere follow up, HIP 113103 b and HIP 113103 c could provide insight on planetary evolution for the sub-Neptune K-star population.