Search Publications
The Radial Distribution and Excitation of H2 around Young Stars in the HST-ULLYSES Survey
Herczeg, Gregory J.; France, Kevin; Ábrahám, P. +8 more
The spatial distribution and evolution of gas in the inner 10 au of protoplanetary disks form the basis for estimating the initial conditions of planet formation. Among the most important constraints derived from spectroscopic observations of the inner disk are the radial distributions of the major gas phase constituents, how the properties of the…
Extended corona models of X-ray reverberation in the AGN 1H 0707-495 and IRAS 13224-3809
Chainakun, P.; Young, A. J.; Hancock, S.
We fit a new vertically extended corona model to previously measured reverberation time lags observed by XMM-Newton in two extremely variable narrow-line Seyfert 1 active galactic nuclei, 1H 0707-495 and IRAS 13224-3809, in a variety of similarly observed flux groups and explore the model in all observations over a 16 yr period. The model employs …
A full transit of v2 Lupi d and the search for an exomoon in its Hill sphere with CHEOPS
Guterman, P.; Alonso, R.; Deleuil, M. +90 more
The planetary system around the naked-eye star v2 Lupi (HD 136352; TOI-2011) is composed of three exoplanets with masses of 4.7, 11.2, and 8.6 Earth masses (M⊕). The TESS and CHEOPS missions revealed that all three planets are transiting and have radii straddling the radius gap separating volatile-rich and volatile-poor super…
Stragglers of the thick disc
Katz, D.; Haywood, M.; Royer, F. +2 more
Young alpha-rich (YAR) stars have been detected in the past as outliers to the local age − [α/Fe] relation. These objects are enhanced in α-elements, but they are apparently younger than typical thick disc stars. Here, we study the global kinematics and chemical properties of YAR giant stars in the APOGEE DR17 survey and show that they have proper…
Probing the timescale of the 1.4 GHz radio emissions as a star formation tracer
Magnelli, B.; Ilbert, O.; Ciesla, L. +3 more
Context. Radio used as a tracer of the star formation rate (SFR) presents enormous advantages because it is not affected by dust and radio sources that are located at the subarcsecond level. The interpretation of the low-frequency 1.4 GHz luminosity is hampered by the difficulty of modeling the paths of cosmic rays in the interstellar medium, howe…
Gaia Focused Product Release: Sources from Service Interface Function image analysis. Half a million new sources in omega Centauri
Prusti, T.; Mazeh, T.; Zucker, S. +400 more
Context. Gaia's readout window strategy is challenged by very dense fields in the sky. Therefore, in addition to standard Gaia observations, full Sky Mapper (SM) images were recorded for nine selected regions in the sky. A new software pipeline exploits these Service Interface Function (SIF) images of crowded fields (CFs), making use of the availa…
Timing the formation of the galactic thin disc with asteroseismic stellar ages
Zhao, Gang; Wu, Yaqian; Xiang, Maosheng +3 more
The formation of the extended thin disc is the most spectacular event of our Galaxy in the past ~8 Gyr. To unveil this process, obtaining precise and accurate stellar ages for a large sample of stars is essential although challenging. In this work, we present the asteroseismic age determination of 5306 red giant branch stars using Kepler and LAMOS…
Minute-cadence observations of the LAMOST fields with the TMTS: II. Catalogues of short-period variable stars from the first 2-yr surveys
Filippenko, Alexei V.; Wang, Xiaofeng; Németh, Péter +25 more
Over the past few years, wide-field time-domain surveys such as Zwicky Transient Facility and Optical Gravitational Lensing Experiment have led to discoveries of various types of interesting short-period stellar variables, such as ultracompact eclipsing binary white dwarfs (WDs), rapidly rotating magnetized WDs, transitional cataclysmic variables …
Measuring the hot ICM velocity structure function using XMM-Newton observations
Pinto, C.; Federrath, C.; Sanders, J. S. +4 more
It has been shown that the gas velocities within the intracluster medium (ICM) can be measured by applying the novel XMM-Newton EPIC-pn energy scale calibration, which uses instrumental Cu Kα as reference for the line emission. Using this technique, we have measured the velocity distribution of the ICM for clusters involving AGN feedback and slosh…
Iron-peak Element Abundances in Warm Very Metal-poor Stars
Roederer, Ian U.; Sneden, Christopher; Cowan, John J. +3 more
We have derived new detailed abundances of Mg, Ca, and the Fe-group elements Sc through Zn (Z = 21-30) for 37 main-sequence turnoff very metal-poor stars ([Fe/H] ≲-2.1). We analyzed Keck HIRES optical and near-UV high signal-to-noise spectra originally gathered for a Be abundance survey. Using typically ~400 Fe-group lines with accurate laboratory…