Light Curves of Trans-Neptunian Objects from the K2 Mission of the Kepler Space Telescope

Light Curves of Trans-Neptunian Objects from the K2 Mission of the Kepler Space Telescope
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开普勒太空望远镜 K2 任务中海王星外天体的光曲线

DOI:
10.3847/1538-4365/ac9c67
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发表时间:
2022
期刊:
The Astrophysical Journal Supplement Series
影响因子:
--
通讯作者:
L. Kiss
L. Kiss
中科院分区:
--
文献类型:
--
作者:
V. Kecskem'ethy;C. Kiss;R. Szak'ats;A. P'al;G. Szab'o;L. Moln'ar;K. Sárneczky;J. Vinkó;R'obert Szab'o;G. Marton;A. Farkas;Cs. Kalup;L. Kiss

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开普勒空间望远镜的K2使命使得能够观测整个太阳系中太阳系小天体的光变曲线。在本文中,我们介绍了活动C 03(2014年11月至2015年2月)和C19(2018年8月至9月)之间的K2 trans-Neptunian天体观测结果,其中包括66个目标。由于我们的目标很模糊,光变曲线周期的可探测率为1.56%,明显低于其他小天体群体,如希尔达斯或木星特洛伊。我们设法获得37个目标的光变曲线周期与可接受的信心,这些情况下,大多数是新的标识。我们能够给出其他29个目标的光变曲线振幅上限。新探测到的光变曲线周期中有几个比1024小时长,在许多情况下接近1080小时;即,这些目标是缓慢旋转的。这种缓慢旋转物体的相对丰度与K2使命中在希尔达斯、木星特洛伊和半人马座中观察到的相似,也与TESS太空望远镜测量的主带小行星相似。海王星外天体在大尺寸(D = 300公里)时的光变曲线幅度明显高于大型主带小行星,这与一般的预期形成对照,因为它们的抗压强度较低,在比太阳系内的小行星小的尺寸时达到流体静力平衡。
The K2 mission of the Kepler Space Telescope allowed the observations of light curves of small solar system bodies throughout the whole solar system. In this paper, we present the results of a collection of K2 trans-Neptunian object observations between campaigns C03 (2014 November–2015 February) and C19 (2018 August–September), which includes 66 targets. Due to the faintness of our targets, the detectability rate of a light-curve period is ∼56%, notably lower than in the case of other small-body populations, like Hildas or Jovian Trojans. We managed to obtain light-curve periods with an acceptable confidence for 37 targets; the majority of these cases are new identifications. We were able to give light-curve amplitude upper limits for the other 29 targets. Several of the newly detected light-curve periods are longer than ∼24 hr, in many cases close to ∼80 hr; i.e., these targets are slow rotators. This relative abundance of slowly rotating objects is similar to that observed among Hildas, Jovian Trojans, and Centaurs in the K2 mission, as well as among main belt asteroids measured with the TESS space telescope. Trans-Neptunian objects show notably higher light-curve amplitudes at large (D ≳ 300 km) sizes than found among large main belt asteroids, in contrast to the general expectation that due to their lower compressive strength, they reach hydrostatic equilibrium at smaller sizes than their inner solar system counterparts.
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