New surface composition and temperature maps of Pluto from New Horizons LEISA data

IF 3.2 2区物理与天体物理 Q2 ASTRONOMY & ASTROPHYSICS

Icarus Pub Date : 2026-07-01 Epub Date: 2026-03-06 DOI:10.1016/j.icarus.2026.117031

Alexey Drozdov, Nikolay Emelyanov

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引用次数: 0

Abstract

New Horizons RALPH/LEISA near-infrared spectra allow for regional mapping of Pluto’s surface ices and their physical state; however, scan-to-scan artifacts and variable spatial resolution complicate quantitative interpretation. We extend previous LEISA compositional studies (Protopapa et al., 2017; Schmitt et al., 2017; Emran et al., 2023) by combining five close-approach observations into co-registered equirectangular maps at 7 km/pixel and by jointly retrieving surface temperature, ice abundances, and grain sizes using a Hapke-based mixing model.

We mitigate bad pixels and edge overexposure linked to flat-field uncertainties and correct for residual scan-to-scan spectral discrepancies using per-observation scale and offset terms. The resulting maps provide distributions of CH

_{4}

-rich ice, N

_{2}

-rich ice, H

_{2}

O ice, and Titan Tholin, alongside a corresponding temperature map.

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来自新视野LEISA数据的冥王星新的表面成分和温度图

新地平线RALPH/LEISA近红外光谱允许对冥王星表面冰及其物理状态进行区域测绘；然而，扫描到扫描的伪影和可变的空间分辨率使定量解释复杂化。我们扩展了之前的LEISA成分研究（Protopapa等人，2017；Schmitt等人，2017；Emran等人，2023），将五个近距离观测结果结合到7公里/像素的共同注册等矩形图中，并使用基于hapke的混合模型联合检索地表温度、冰丰度和粒度。我们减轻了与平场不确定性相关的坏像素和边缘过度曝光，并使用每次观测尺度和偏移项纠正了残余扫描到扫描的光谱差异。得到的地图提供了富ch4冰、富n2冰、H2O冰和泰坦托林的分布，以及相应的温度图。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Icarus 地学天文-天文与天体物理

CiteScore

6.30

自引率

18.80%

发文量

356

审稿时长

2-4 weeks

期刊介绍： Icarus is devoted to the publication of original contributions in the field of Solar System studies. Manuscripts reporting the results of new research - observational, experimental, or theoretical - concerning the astronomy, geology, meteorology, physics, chemistry, biology, and other scientific aspects of our Solar System or extrasolar systems are welcome. The journal generally does not publish papers devoted exclusively to the Sun, the Earth, celestial mechanics, meteoritics, or astrophysics. Icarus does not publish papers that provide "improved" versions of Bode''s law, or other numerical relations, without a sound physical basis. Icarus does not publish meeting announcements or general notices. Reviews, historical papers, and manuscripts describing spacecraft instrumentation may be considered, but only with prior approval of the editor. An entire issue of the journal is occasionally devoted to a single subject, usually arising from a conference on the same topic. The language of publication is English. American or British usage is accepted, but not a mixture of these.