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We predict how protoplanetary disks around low-mass young stars would appear in molecular lines observed with the ALMA interferometer. Our goal is to identify those molecules and transitions that can be used to probe and distinguish between…

Astrophysics · Physics 2009-11-13 D. Semenov , Ya. Pavlyuchenkov , Th. Henning , S. Wolf , R. Launhardt

The intensity of radiation at millimeter wavelengths from the solar atmosphere is closely related to the plasma temperature and the height of formation of the radiation is wavelength dependent. From that follows that the slope of the…

Solar and Stellar Astrophysics · Physics 2023-01-18 Henrik Eklund , Mikolaj Szydlarski , Sven Wedemeyer

Aims: A pilot project has been carried out to measure circumstellar CO emission from three OH/IR stars close to the Galactic centre. The intention was to find out whether it would be possible to conduct a large-scale survey for mass-loss…

Astrophysics of Galaxies · Physics 2009-11-13 A. Winnberg , S. Deguchi , M. J. Reid , J. Nakashima , H. Olofsson , H. J. Habing

Ionised regions around OB-type stars are formed at an early stage of their evolution and are important to investigate the formation process of these objects. However, so far only few observations of their physical structure and interaction…

By direct measurements of the gas temperature, the Atacama Large Millimeter/sub-millimeter Array (ALMA) has yielded a new diagnostic tool to study the solar chromosphere. Here we present an overview of the brightness-temperature…

High spatial resolution CO observations of mid-inclination (30-75{\deg}) protoplanetary disks offer an opportunity to study the vertical distribution of CO emission and temperature. The asymmetry of line emission relative to the disk major…

Our aim is to test potential solar prominence plasma diagnostics as obtained with the new solar capability of the Atacama Large Millimeter / submillimeter Array (ALMA). We investigate the thermal and plasma diagnostic potential of ALMA for…

Solar and Stellar Astrophysics · Physics 2017-09-13 Andrew S Rodger , Nicolas Labrosse

The aim of this study is to demonstrate how the logarithmic millimeter continuum gradient observed using the Atacama Large Millimeter/submillimeter Array (ALMA) may be used to estimate optical thickness in the solar atmosphere. We discuss…

Solar and Stellar Astrophysics · Physics 2019-05-01 Andrew S. Rodger , Nicolas Labrosse , Sven Wedemeyer , Mikolaj Szydlarski , Paulo J. A. Simões , Lyndsay Fletcher

The infrared spectral energy distributions (SEDs) of main-sequence galaxies in the early universe (z > 4) is currently unconstrained as infrared continuum observations are time consuming and not feasible for large samples. We present…

Tidal heating is the major source of heat in the outer Solar System. Because of its strong tidal interaction with Jupiter and the other Galilean Satellites, Io is incredibly volcanically active. We use the directly measured volcanic…

Earth and Planetary Astrophysics · Physics 2018-11-14 Julie A. Rathbun , Rosaly M. C. Lopes , John R. Spencer

Solar observations at sub-mm, mm and cm wavelengths offer a straightforward diagnostic of physical conditions in the solar atmosphere because they yield measurement of brightness temperature which, for optically thick features, equals…

Solar and Stellar Astrophysics · Physics 2022-09-07 Costas Alissandrakis , Timothy Bastian , Roman Brajša

Environmental effects, such as stellar fly-bys and external irradiation, are thought to affect the evolution of protoplanetary disks in clustered star formation. Previous ALMA images at 225 GHz of the ISO-Oph 2 binary revealed a peculiar…

We present a thermal observation of Callisto's leading hemisphere obtained using the Atacama Large Millimeter/submillimeter Array (ALMA) at 0.87 mm (343 GHz). The angular resolution achieved for this observation was…

Earth and Planetary Astrophysics · Physics 2023-08-29 Maria Camarca , Katherine de Kleer , Bryan Butler , Alex B. Akins , Alexander Thelen , Imke de Pater , Mark A. Gurwell , Arielle Moullet

Io's internal heat is generated by Jupiter-driven tidal dissipation and Laplace resonance. This energy partially melts the mantle, but the melt fraction, depth, and spatial distribution of dissipation remain poorly constrained. Tidal…

Earth and Planetary Astrophysics · Physics 2026-03-20 M. Paris , A. Mura , F. Zambon , A. Genova , F. Tosi , A. Consorzi , G. Mitri , A. Cicchetti , S. Bolton , R. Noschese , G. Piccioni , C. Plainaki , G. Sindoni , R. Sordini

Lava planets have non-global, condensible atmospheres similar to icy bodies within the solar system. Because they depend on interior dynamics, studying the atmospheres of lava planets can lead to understanding unique geological processes…

Earth and Planetary Astrophysics · Physics 2022-05-25 T. Giang Nguyen , Nicolas B. Cowan , Raymond T. Pierrehumbert , Roxana E. Lupu , John E. Moores

The flow of material from Io's volcanoes into the Io plasma torus, out into the magnetosphere, and along field lines into Jupiter's upper atmosphere is not adequately understood. The lack of observations of spatial and temporal variations…

Earth and Planetary Astrophysics · Physics 2017-03-29 Phillip H. Phipps , Paul Withers

The Atacama Large Millimeter/sub-millimeter Array (ALMA) has provided us with an excellent diagnostic tool for studies of the dynamics of the Solar chromosphere, albeit through a single receiver band at one time presently. Each ALMA band…

Solar and Stellar Astrophysics · Physics 2022-09-14 Juan Camilo Guevara Gómez , Shahin Jafarzadeh , Sven Wedemeyer , Mikolaj Szydlarski

We present a flexible, annulus-by-annulus method to constrain the 2-D thermal structure of a protoplanetary disk from optically thick spectral line emission. Using synthetic disk models with a known temperature and density structure, we…

Earth and Planetary Astrophysics · Physics 2025-09-19 Anna J. Fehr , Sean M. Andrews

We studied chromospheric oscillations using Atacama Large millimeter and sub-millimeter Array (ALMA) time-series of interferometric observations of the quiet Sun obtained at 3 mm with a 2-s cadence and a spatial resolution of a few arcsec.…

Solar and Stellar Astrophysics · Physics 2020-02-12 S. Patsourakos , C. E. Alissandrakis , A. Nindos , T. S. Bastian