基于地基恒星掩星的冥王星低层大气与压强演化（1988–2016）
地球与行星天体物理
2019-05-15 v1
摘要
背景。冥王星稀薄的氮（N2）大气由于高转轴倾角和轨道偏心率而经历强烈的季节效应，且最近（2015年7月）被 New Horizons 航天器观测到。目标为：（i）构建冥王星表面压强季节演化的良好定标记录；（ii）利用 2015 年观测到的中心闪光照约束低层大气结构。方法：使用 2002 至 2016 年间观测到的十一次冥王星恒星掩星，反演海拔约 5 km 至约 380 km 高度层（即压强从约 10 微巴到 10 纳巴）的大气剖面（密度、压强、温度）。结果：（i）压强从 1988 到 2016 年经历单调增加，与季节挥发性输运模型比较，由此导出对 N2 冰反照率与发射率组合的严格约束；（ii）2015 年 6 月 29 日观测到的中心闪光与 New Horizons REX 剖面一致，前提是（a）在 Sputnik Planitia 上存在大的日温度变化（当前模型未预期）和/或（b）在 4–7 km 高度层存在切向光学深度约 0.3 的霾和/或（c）标称 REX 密度值被高估了约 20% 这一难以置信的大因子和/或（d）较高地形阻挡了面向 Charon 半球的部分闪光。
引用
@article{arxiv.1903.02315,
title = {Pluto's lower atmosphere and pressure evolution from ground-based stellar occultations, 1988-2016},
author = {E. Meza and B. Sicardy and M. Assafin and J. L. Ortiz and T. Bertrand and E. Lellouch and J. Desmars and F. Forget and D. Bérard and A. Doressoundiram and J. Lecacheux and J. Marques Oliveira and F. Roques and T. Widemann and F. Colas and F. Vachier and S. Renner and R. Leiva and F. Braga-Ribas and G. Benedetti-Rossi and J. I. B. Camargo and A. Dias-Oliveira and B. Morgado and A. R. Gomes-Júnior and R. Vieira-Martins and R. Behrend and A. Castro Tirado and R. Duffard and N. Morales and P. Santos-Sanz and M. Jelínek and R. Cunniffe and R. Querel and M. Harnisch and R. Jansen and A. Pennell and S. Todd and V. D. Ivanov and C. Opitom and M. Gillon and E. Jehin and J. Manfroid and J. Pollock and D. E. Reichart and J. B. Haislip and K. M. Ivarsen and A. P. LaCluyze and A. Maury and R. Gil-Hutton and V. Dhillon and S. Littlefair and T. Marsh and C. Veillet and K. -L. Bath and W. Beisker and H. -J. Bode and M. Kretlow and D. Herald and D. Gault and S. Kerr and H. Pavlov and O. Faragó and O. Klös and E. Frappa and M. Lavayssière and A. A. Cole and A. B. Giles and J. G. Greenhill and K. M. Hill and M. W. Buie and C. B. Olkin and E. F. Young and L. A. Young and L. H. Wasserman and M. Devogèle and R. G. French and F. B. Bianco and F. Marchis and N. Brosch and S. Kaspi and D. Polishook and I. Manulis and M. Ait Moulay Larbi and Z. Benkhaldoun and A. Daassou and Y. El Azhari and Y. Moulane and J. Broughton and J. Milner and T. Dobosz and G. Bolt and B. Lade and A. Gilmore and P. Kilmartin and W. H. Allen and P. B. Graham and B. Loader and G. McKay and J. Talbot and S. Parker and L. Abe and Ph. Bendjoya and J. -P. Rivet and D. Vernet and L. Di Fabrizio and V. Lorenzi and A. Magazzù and E. Molinari and K. Gazeas and L. Tzouganatos and A. Carbognani and G. Bonnoli and A. Marchini and G. Leto and R. Zanmar Sanchez and L. Mancini and B. Kattentidt and M. Dohrmann and K. Guhl and W. Rothe and K. Walzel and G. Wortmann and A. Eberle and D. Hampf and J. Ohlert and G. Krannich and G. Murawsky and B. Gährken and D. Gloistein and S. Alonso and A. Román and J. -E. Communal and F. Jabet and S. de Visscher and J. Sérot and T. Janik and Z. Moravec and P. Machado and A. Selva and C. Perelló and J. Rovira and M. Conti and R. Papini and F. Salvaggio and A. Noschese and V. Tsamis and K. Tigani and P. Barroy and M. Irzyk and D. Neel and J. P. Godard and D. Lanoiselée and P. Sogorb and D. Vérilhac and M. Bretton and F. Signoret and F. Ciabattari and R. Naves and M. Boutet and J. De Queiroz and P. Lindner and K. Lindner and P. Enskonatus and G. Dangl and T. Tordai and H. Eichler and J. Hattenbach and C. Peterson and L. A. Molnar and R. R. Howell},
journal= {arXiv preprint arXiv:1903.02315},
year = {2019}
}
备注
21 pages, 11 figures