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arXiv 2504.02457astro-ph.EP
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海王星外天体(470316) 2007 OC10的大小与形状:与热数据的比较

Size and shape of the trans-Neptunian object (470316) 2007 OC10: Comparison with thermal data

J. M. Gómez-Limón, R. Leiva, J. L. Ortiz, N. Morales, M. Kretlow, M. Vara-Lubiano, P. Santos-Sanz, A. Álvarez-Candal, J. L. Rizos, R. Duffard, E. Fernández-Vale… 展开作者

J. M. Gómez-Limón, R. Leiva, J. L. Ortiz, N. Morales, M. Kretlow, M. Vara-Lubiano, P. Santos-Sanz, A. Álvarez-Candal, J. L. Rizos, R. Duffard, E. Fernández-Valenzuela, Y. Kilic, S. Cikota, B. Sicardy, F. Bragas-Ribas, M. R. Alarcon, S. Alis, Z. Benkhaldoun, A. Burdanov, J. de Wit, S. Calavia Belloc, J. Calvo Fernández, O. Canales Moreno, G. Catanzaro, S. Fisek, A. Frasca, R. Iglesias-Marzoa, R. Infante-Sainz, A. Jiménez-Guisado, S. Kaspi, T. Kuutma, D. Lafuente Aznar, J. Licandro, J. L. Maestre, P. Martorell, A. Nastasi, G. Occhipinti, C. Perelló, C. Rinner, B. Samper-Doménech, A. San Segundo, T. Santana-Ros, M. Serra-Ricart

AI总结:

本研究通过观测2022年8月22日的恒星掩星事件,结合贝叶斯方法与马尔可夫链蒙特卡罗模拟,测定了海王星外天体2007 OC10的大小、形状、反照率等参数,还发现被掩恒星为双星并约束了相关参数。

摘要:

目前仅12颗海王星外天体(trans-Neptunian object,TNO)的形状得到了直接测量,这些测量结果为研究其内部结构提供了关键见解。这些属性与塑造早期太阳系的过程密切相关,也为太阳系的演化提供了重要线索。\n本研究的目标是表征TNO (470316) 2007 OC10的大小、形状、几何反照率和聚束参数。我们将这些数值与“TNOs are Cool”巡天项目通过热数据得到的有效直径和几何反照率进行了对比。我们还结合掩星数据和热数据,对可能存在的未分辨卫星的大小进行了约束。\n我们预测2007 OC10将于2022年8月22日掩食Gaia DR3 2727866328215869952号恒星,共有4个观测站探测到了此次掩星事件。我们为2007 OC10的投影建立了椭圆形状模型,采用贝叶斯方法,通过马尔可夫链蒙特卡罗方法得到了模型参数空间的后验概率密度。\n2007 OC10的椭圆边缘半长轴和半短轴为$215^{+10}_{-7} \times 141 ^{+24}_{-23}$ km,因此投影轴比$b/a = 0.58^{+0.16}_{-0.16}$,等面积直径为$330^{+56}_{-55}$ km。根据我们测得的绝对星等$H_V = 5.40 \pm 0.02$,其几何反照率$p_V = 11.2 ^{+2.1}_{-5.0}$%。结合掩星结果与热数据,我们将聚束参数约束为$η= 1.42^{+0.75}_{-0.58}$。掩星数据还显示该恒星是双星,次星相对于主星的位置角为$56^{+3}_{-17}$度,角间距为$57^{+4}_{-11}$毫角秒,亮度比主星暗$1.18^{+0.07}_{-0.07}$个星等。

英文摘要:

The shapes of only 12 trans-Neptunian objects have been directly measured, offering crucial insights into their internal structure. These properties are strongly connected to the processes that shaped the early Solar System, and provide important clues about its evolution. The aim of the present work is to characterise the size, shape, geometric albedo, and beaming parameter of the TNO (470316) 2007 OC10 . We compared these values to the effective diameter and geometric albedo obtained from thermal data by the TNOs are Cool survey. We also combined occultation and thermal data to constrain the size of a putative unresolved satellite. We predicted an occultation of the star Gaia DR3 2727866328215869952 by 2007 OC10 on 2022 August 22. Four stations detected the occultation. We implemented an elliptical shape model for the projection of 2007 OC10. Following a Bayesian approach, we obtained the posterior probability density in the model parameter space using a Markov chain Monte Carlo method. The elliptical limb of 2007 OC10 has semi-axes of $ 215^{+10}_{-7} \times 141 ^{+24}_{-23}$ km, and thus the projected axis ratio is $b/a = 0.58^{+0.16}_{-0.16}$. The area-equivalent diameter is $330^{+56}_{-55}$,km. From our own absolute magnitude value of $H_V = 5.40 \pm 0.02$, the geometric albedo is $p_V = 11.2 ^{+2.1}_{-5.0}$ %. Combining the occultation results with thermal data, we constrain the beaming parameter to $η= 1.42^{+0.75}_{-0.58}$. Occultation data reveal that the star is double. The secondary star has a position angle with respect to the primary of $56^{+3}_{-17}$ degrees, has an angular separation of $57^{+4}_{-11}$ mas, and is $1.18^{+0.07}_{-0.07}$ magnitudes fainter than the primary.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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