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The influence of the uncertainties in the rate coefficient data for electron-impact excitation and ionization on non-LTE Li line formation in cool stellar atmospheres is investigated. We examine the electron collision data used in previous…

太阳与恒星天体物理 · 物理学 2015-05-27 Y. Osorio , P. S. Barklem , K. Lind , M. Asplund

Atmospheric convection behaves differently in hydrogen-rich atmospheres compared to higher mean molecular weight atmospheres due to compositional gradients of tracers. Previous 1D studies predict that when a condensible tracer exceeds a…

地球与行星天体物理 · 物理学 2025-11-18 Namrah Habib , Raymond T. Pierrehumbert

We use the Mars Regional Atmospheric Modeling System (MRAMS) to simulate lake storms on Mars, finding that intense localized precipitation will occur for lake size >=10^3 km^2. Mars has a low-density atmosphere, so deep convection can be…

地球与行星天体物理 · 物理学 2011-07-28 Edwin S. Kite , Timothy I. Michaels , Scot Rafkin , Michael Manga , William E. Dietrich

We analyze the line ratio of the $^{13}$CO (2-1) to $^{12}$CO (2-1) rotational transitions observed from new ALMA observations of 100 Giant Molecular Clouds (GMCs) that span the Large Magellanic Cloud. We measure a median line ratio of…

星系天体物理 · 物理学 2026-05-19 Dia Kalra , Erik Rosolowsky , Adam Leroy , Remy Indebetouw

This paper presents a simple approach to combine the high-resolution narrowband features of some desired isolated line models together with the far wing behavior of the projection based strong collision (SC) method to line mixing which was…

计算物理 · 物理学 2023-08-09 Sven Nordebo

In cold molecular clouds submillimetre emission lines are excited by the ambient radiation field. The pumping is dominated by the cosmic microwave background (CMB). It is usual in molecular line radiative transfer modelling to simply assume…

天体物理学 · 物理学 2009-11-10 M. P. Redman , J. M. C. Rawlings , J. A. Yates , D. A. Williams

We measure the visible and near-infrared reflectance of icy analogues of the Martian surface made of CO$_2$ ice associated in different ways with H$_2$O ice and the regolith simulant JSC Mars-1. Such experimental results obtained with…

地球与行星天体物理 · 物理学 2022-07-29 Zuriñe Yoldi , Antoine Pommerol , Olivier Poch , Nicolas Thomas

We use a one-dimensional line-by-line radiative-convective model to simulate hot, dense terrestrial-planet atmospheres. We find that strong shortwave absorption by H2O and CO2 inhibits near-surface convection, reducing surface temperatures…

地球与行星天体物理 · 物理学 2025-05-05 Jessica Cmiel , Robin Wordsworth , Jacob T. Seeley

Carbon dioxide ice clouds are thought to play an important role for cold terrestrial planets with thick CO2 dominated atmospheres. Various previous studies showed that a scattering greenhouse effect by carbon dioxide ice clouds could result…

地球与行星天体物理 · 物理学 2016-02-03 Daniel Kitzmann

Radiative turbulent mixing layers (TMLs) are ubiquitous in astrophysical environments, e.g., the circumgalactic medium (CGM), and are triggered by the shear velocity at interfaces between different gas phases. To understand the shear…

星系天体物理 · 物理学 2023-02-09 Yanhui Yang , Suoqing Ji

We report on the initial analysis of Herschel/HIFI carbon monoxide (CO) observations of the Martian atmosphere performed between 11 and 16 April 2010. We selected the (7-6) rotational transitions of the isotopes ^{13}CO at 771 GHz and…

Vertical mixing disrupts the thermochemical equilibrium and introduces additional heat flux that alters exoplanetary atmospheric temperatures. We investigate how this mixing-induced heat flux affects atmospheric chemistry. Temperature…

地球与行星天体物理 · 物理学 2025-10-27 Zhen-Tai Zhang , Wei Zhong , Wei Wang , Jianheng Guo , Xianyu Tan , Bo Ma , Ruyi Wei , Cong Yu

We use state-of-the-art radiation-MHD simulations and 3D non-LTE radiative transfer computations to investigate \Halpha\ line formation in the solar chromosphere and apply the results of this investigation to develop the potential of…

太阳与恒星天体物理 · 物理学 2015-06-04 Jorrit Leenaarts , Mats Carlsson , Luc Rouppe van der Voort

The rotational transitions of carbon monoxide (CO) are the primary means of investigating the density and velocity structure of the molecular interstellar medium. Here we study the lowest four rotational transitions of CO towards…

天体物理学 · 物理学 2009-10-31 James G. Ingalls , T. M. Bania , Adair P. Lane , Matthias Rumitz , Antony A. Stark

Accurate and comprehensive H2 pressure-induced broadening data for CO2 infrared lines over a wide temperature range are essential for modeling atmospheric opacity of exoplanets. However, available data are currently limited, some of which…

地球与行星天体物理 · 物理学 2026-05-13 Faten Hendaoui , Pascale Chelin , Xavier Landsheere , Hassen Aroui , Ha Tran

We investigate the influence of convection on the formation of molecular spectral lines in the atmospheres of late-type giants. For this purpose we use the 3D hydrodynamical CO5BOLD and classical 1D LHD stellar atmosphere codes and…

太阳与恒星天体物理 · 物理学 2011-05-02 A. Ivanauskas , A. Kucinskas , H. -G. Ludwig , E. Caffau

Rate coefficients for inelastic collisions between Li and H atoms covering all transitions between the asymptotic states Li(2s,2p,3s,3p,3d,4s,4p,4d,4f)+H(1s) and Li^+ +H^- are presented for the temperature range 2000-8000 K based on recent…

天体物理学 · 物理学 2009-11-10 P. S. Barklem , A. K. Belyaev , M. Asplund

We use a 3D general circulation model to compare the primitive Martian hydrological cycle in "warm and wet" and "cold and icy" scenarios. In the warm and wet scenario, an anomalously high solar flux or intense greenhouse warming…

地球与行星天体物理 · 物理学 2015-08-06 Robin D. Wordsworth , Laura Kerber , Raymond T. Pierrehumbert , Francois Forget , James W. Head

We analyze the collisional excitation of the 158 micron (1900.5 GHz) fine structure transition of ionized carbon (C+) in terms of line intensities produced by simple cloud models. The single C+ fine structure transition is a very important…

星系天体物理 · 物理学 2015-06-11 Paul F. Goldsmith , William D. Langer , Jorge L. Pineda , T. Velusamy

We test the ability of equilibrium galactic disk and one-zone interstellar medium models to describe the physical and emission properties of quasar hosts, submillimeter galaxies, and Lyman-alpha emitters at z>~6. The size, line widths, star…

宇宙学与河外天体物理 · 物理学 2017-03-08 Joseph A. Muñoz , Steven R. Furlanetto