Isotopologue
View article: The HITRAN2020 molecular spectroscopic database
The HITRAN2020 molecular spectroscopic database Open
The HITRAN database is a compilation of molecular spectroscopic parameters. It was established in the early 1970s and is used by various computer codes to predict and simulate the transmission and emission of light in gaseous media (with a…
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ALMA SURVEY OF LUPUS PROTOPLANETARY DISKS. I. DUST AND GAS MASSES Open
We present the first high-resolution sub-millimeter survey of both dust and gas for a large population of protoplanetary disks. Characterizing fundamental properties of protoplanetary disks on a statistical level is critical to understandi…
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The ALMA Protostellar Interferometric Line Survey (PILS) Open
Context. The inner regions of the envelopes surrounding young protostars are characterized by a complex chemistry, with prebiotic molecules present on the scales where protoplanetary disks eventually may form. The Atacama Large Millimeter/…
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The Connected Isotopic Water Cycle in the Community Earth System Model Version 1 Open
Because of the pervasive role of water in the Earth system, the relative abundances of stable isotopologues of water are valuable for understanding atmospheric, oceanic, and biospheric processes, and for interpreting paleoclimate proxy rec…
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A Kinematical Detection of Two Embedded Jupiter-mass Planets in HD 163296 Open
We present the first kinematical detection of embedded protoplanets within a protoplanetary disk. Using archival Atacama Large Millimetre Array (ALMA) observations of HD 163296, we demonstrate a new technique to measure the rotation curves…
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Metabolite Spectral Accuracy on Orbitraps Open
Orbitraps are high-resolution ion-trap mass spectrometers that are widely used in metabolomics. While the mass accuracy and resolving power of orbitraps have been extensively documented, their spectral accuracy, i.e., accuracy in measuring…
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EUREC <sup>4</sup> A Open
The science guiding the EUREC4A campaign and its measurements is presented. EUREC4A comprised roughly 5 weeks of measurements in the downstream winter trades of the North Atlantic – eastward and southeastward of Barbados. Through its abili…
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ALMA unveils rings and gaps in the protoplanetary system HD 169142: signatures of two giant protoplanets Open
The protoplanetary system HD 169142 is one of the few cases where a potential candidate protoplanet has recently been detected by direct imaging in the near-infrared. To study the interaction between the protoplanet and the disk itself, ob…
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ExoMol molecular line lists – XXXIII. The spectrum of Titanium Oxide Open
Accurate line lists are crucial for correctly modelling a variety of astrophysical phenomena, including stellar photospheres and the atmospheres of extrasolar planets. This paper presents a new line database Toto for the main isotopologues…
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A HIGH-PRECISION NEAR-INFRARED SURVEY FOR RADIAL VELOCITY VARIABLE LOW-MASS STARS USING CSHELL AND A METHANE GAS CELL Open
We present the results of a precise near-infrared (NIR) radial velocity (RV) survey of 32 low-mass stars with spectral types K2–M4 using CSHELL at the NASA InfraRed Telescope Facility in the K band with an isotopologue methane gas cell to …
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THE RADIAL DISTRIBUTION OF H<sub>2</sub> AND CO IN TW HYA AS REVEALED BY RESOLVED ALMA OBSERVATIONS OF CO ISOTOPOLOGUES Open
CO is widely used as a tracer of molecular gas. However, there is now mounting evidence that gas phase carbon is depleted in the disk around TW Hya. Previous efforts to quantify this depletion have been hampered by uncertainties regarding …
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The Ophiuchus DIsc Survey Employing ALMA (ODISEA) – I: project description and continuum images at 28 au resolution Open
We introduce the Ophiuchus DIsc Survey Employing ALMA (ODISEA), a project\naiming to study the entire population of Spitzer-selected protoplanetary discs\nin the Ophiuchus Molecular Cloud (~300 objects) from both millimeter continuum\nand …
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The ALMA-PILS survey: isotopic composition of oxygen-containing complex organic molecules toward IRAS 16293–2422B Open
Context. One of the important questions of astrochemistry is how complex organic molecules, including potential prebiotic species, are formed in the envelopes around embedded protostars. The abundances of minor isotopologues of a molecule,…
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Direct mapping of the temperature and velocity gradients in discs Open
Accurate measurements of the physical structure of protoplanetary discs are critical inputs for planet formation models. These constraints are traditionally established via complex modelling of continuum and line observations. Instead, we …
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Lupus disks with faint CO isotopologues: low gas/dust or high carbon depletion? Open
Context. An era has started in which gas and dust can be observed independently in protoplanetary disks, thanks to the recent surveys with the Atacama Large Millimeter/sub-millimeter Array (ALMA). The first near-complete high-resolution di…
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ExoMol line lists – XXXIX. Ro-vibrational molecular line list for CO2 Open
A new hot line list for the main isotopologue of CO2, 12C16O2 is presented. The line list consists of almost 2.5 billion transitions between 3.5 million rotation-vibration states of CO2 in its ground electronic state, covering the wavenumb…
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The evolution of CNO isotopes: a new window on cosmic star formation history and the stellar IMF in the age of ALMA Open
We use state-of-the-art chemical models to track the cosmic evolution of the CNO isotopes in the interstellar medium of galaxies, yielding powerful constraints on their stellar initial mass function (IMF). We re-assess the relative roles o…
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Exploring molecular complexity with ALMA (EMoCA): Deuterated complex organic molecules in Sagittarius B2(N2) Open
Context. Deuteration is a powerful tracer of the history of the cold prestellar phase in star-forming regions. Apart from methanol, little is known about deuterium fractionation of complex organic molecules in the interstellar medium, espe…
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The ALMA-PILS survey: inventory of complex organic molecules towards IRAS 16293–2422 A Open
Context. Complex organic molecules are detected in many sources in the warm inner regions of envelopes surrounding deeply embedded protostars. Exactly how these species form remains an open question. Aims. This study aims to constrain the …
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Evaluating hydrological processes in the <span>C</span>ommunity <span>A</span>tmosphere <span>M</span>odel <span>V</span>ersion 5 (<span>C</span>AM5) using stable isotope ratios of water Open
Water isotope‐enabled climate and earth system models are able to directly simulate paleoclimate proxy records to aid in climate reconstruction. A less used major advantage is that water isotopologues provide an independent constraint on m…
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Early Planet Formation in Embedded Disks (eDisk). I. Overview of the Program and First Results Open
We present an overview of the Large Program, “Early Planet Formation in Embedded Disks (eDisk),” conducted with the Atacama Large Millimeter/submillimeter Array (ALMA). The ubiquitous detections of substructures, particularly rings and gap…
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Molecules with ALMA at Planet-forming Scales (MAPS). IV. Emission Surfaces and Vertical Distribution of Molecules Open
The Molecules with ALMA at Planet-forming Scales (MAPS) Large Program provides a unique opportunity to study the vertical distribution of gas, chemistry, and temperature in the protoplanetary disks around IM Lup, GM Aur, AS 209, HD 163296,…
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SLIM Ultrahigh Resolution Ion Mobility Spectrometry Separations of Isotopologues and Isotopomers Reveal Mobility Shifts due to Mass Distribution Changes Open
We report on separations of ion isotopologues and isotopomers using ultrahigh-resolution traveling wave-based Structures for Lossless Ion Manipulations with serpentine ultralong path and extended routing ion mobility spectrometry coupled t…
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Attribution of recent increases in atmospheric methane through 3-D inverse modelling Open
The atmospheric methane (CH4) growth rate has varied considerably in recent decades. Unexplained renewed growth after 2006 followed 7 years of stagnation and coincided with an isotopic trend toward CH4 more depleted in 13C, suggesting chan…
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ExoMol molecular line lists – XXXVII. Spectra of acetylene Open
A new ro-vibrational line list for the ground electronic state of the main isotopologue of acetylene, 12C2H2, is computed as part of the ExoMol project. The aCeTY line list covers the transition wavenumbers up to 10 000 cm−1 (λ > 1 $\mu$m)…
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The ALMA-PILS survey: the sulphur connection between protostars and comets: IRAS 16293–2422 B and 67P/Churyumov–Gerasimenko Open
The evolutionary past of our Solar System can be pieced together by comparing\nanalogous low-mass protostars with remnants of our Protosolar Nebula - comets.\nSulphur-bearing molecules may be unique tracers of the joint evolution of the\nv…
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SEDIGISM: Structure, excitation, and dynamics of the inner Galactic interstellar medium Open
Context. The origin and life-cycle of molecular clouds are still poorly constrained, despite their importance for understanding the evolution of the interstellar medium. Many large-scale surveys of the Galactic plane have been conducted re…
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The census of interstellar complex organic molecules in the Class I hot corino of SVS13-A Open
We present the first census of the interstellar Complex Organic Molecules\n(iCOMs) in the low-mass Class I protostar SVS13-A, obtained by analysing data\nfrom the IRAM-30m Large Project ASAI (Astrochemical Surveys At IRAM). They\nconsist o…
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FluxFix: automatic isotopologue normalization for metabolic tracer analysis Open
Background Isotopic tracer analysis by mass spectrometry is a core technique for the study of metabolism. Isotopically labeled atoms from substrates, such as [ 13 C]-labeled glucose, can be traced by their incorporation over time into spec…
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On the Diversity of Asymmetries in Gapped Protoplanetary Disks Open
Protoplanetary disks with large inner dust cavities are thought to host massive planetary or substellar companions. These disks show asymmetries and rings in the millimeter continuum caused by dust trapping in pressure bumps and potentiall…