Search Publications
Oxygen-bearing organic molecules in comet 67P's dusty coma: First evidence for abundant heterocycles
Altwegg, K.; Fuselier, S. A.; Rubin, M. +6 more
The puzzling complexity of terrestrial biomolecules is driving the search for complex organic molecules in the interstellar medium (ISM) and serves as a motivation for many in situ studies of reservoirs of extraterrestrial organics, from meteorites and interplanetary dust particles to comets and asteroids. Comet 67P/Churyumov-Gerasimenko (67P), th…
Young Radio Sources Expanding in Gas-Rich ISM: Using Cold Molecular Gas to Trace Their Impact
Morganti, Raffaella; Oosterloo, Tom; Murthy, Suma +2 more
We present an overview of the results obtained from the study of the resolved distribution of molecular gas around eight young (≲106yr), peaked-spectrum radio galaxies. Tracing the distribution and kinematics of the gas around these radio sources allows us to trace the interplay between the jets and the surrounding medium. For three of these sourc…
Multiples among B stars in the Scorpius-Centaurus association
D'Orazi, V.; Nascimbeni, V.; Janson, M. +14 more
Context. The frequency, semi-major axis, and mass distribution of stellar companions likely depend on the mass of the primaries and on the environment where the stars form. These properties are very different for early- and late-type stars. However, data are largely incomplete, even for the closest environments to the Sun, preventing a cleaner vie…
Detection of H I 21 cm emission from a strongly lensed galaxy at z 1.3
Roy, Nirupam; Chakraborty, Arnab
We report the first 5σ detection of H I 21 cm emission from a star-forming galaxy at redshift z ~ 1.3 (nearly 9 billion years ago) using upgraded Giant Metrewave Radio Telescope (uGMRT). This is the highest redshift H I detection in emission from an individual galaxy to date. The emission is strongly boosted by the gravitational lens, an early-typ…
Gaia21bty: An EXor light curve exhibiting a FUor spectrum
Udalski, Andrzej; Moór, Attila; Ábrahám, Péter +16 more
Gaia21bty, a pre-main-sequence star that previously had shown aperiodic dips in its light curve, underwent a considerable ΔG ≈ 2.9 mag brightening that occurred over a few months between 2020 October and 2021 February. The Gaia light curve shows that the star remained near maximum brightness for about 4-6 months, and then started slowly fading ove…
The TESS-Keck Survey. XV. Precise Properties of 108 TESS Planets and Their Host Stars
Batalha, Natalie M.; Rice, Malena; Kane, Stephen R. +38 more
We present the stellar and planetary properties for 85 TESS Objects of Interest (TOIs) hosting 108 planet candidates that compose the TESS-Keck Survey (TKS) sample. We combine photometry, high-resolution spectroscopy, and Gaia parallaxes to measure precise and accurate stellar properties. We then use these parameters as inputs to a light-curve pro…
Martian Atmospheric Temperature and Density Profiles During the First Year of NOMAD/TGO Solar Occultation Measurements
Modak, Ashimananda; López-Valverde, Miguel Angel; Brines, Adrian +19 more
We present vertical profiles of temperature and density from solar occultation (SO) observations by the "Nadir and Occultation for Mars Discovery" (NOMAD) spectrometer on board the Trace Gas Orbiter during its first operational year, which covered the second half of Mars Year 34. We used calibrated transmittance spectra in 380 scans, and apply an …
Residuals of an equilibrium model for the galaxy reveal a state of disequilibrium in the Solar Neighbourhood
Widrow, Lawrence M.; Li, Haochuan
We simultaneously model the gravitational potential and phase space distribution function (DF) of giant stars near the Sun using the Gaia DR2 radial velocity catalogue. We assume that the Galaxy is in equilibrium and is symmetric about both the spin axis of the disc and the Galactic mid-plane. The potential is taken as a sum of terms that nominall…
Sensitivity of modelled cometary gas production on the properties of the surface layer of the nucleus
Küppers, M.; Hartogh, P.; Besse, S. +3 more
Explanation of the observed gas activity based on the parameters of the comet's nucleus is not an obvious matter. Solutions based on certain thermal models can be obtained, but the use of arbitrary values for poorly known model parameters is always required. In this work, we carry out a study of the dependence of gas activity on these parameters a…
In situ or accreted? Using deep learning to infer the origin of extragalactic globular clusters from observables
Kruijssen, J. M. Diederik; Trujillo-Gomez, Sebastian; Crain, Robert A. +4 more
Globular clusters (GCs) are powerful tracers of the galaxy assembly process, and have already been used to obtain a detailed picture of the progenitors of the Milky Way (MW). Using the E-MOSAICS cosmological simulation of a (34.4 Mpc)3 volume that follows the formation and co-evolution of galaxies and their star cluster populations, we …