Search Publications
A New Catalog of 100,000 Variable TESS A-F Stars Reveals a Correlation between δ Scuti Pulsator Fraction and Stellar Rotation
Huber, Daniel; Bedding, Timothy R.; Murphy, Simon J. +3 more
δ Scuti variables are found at the intersection of the classical instability strip and the main sequence on the Hertzsprung–Russell diagram. With space-based photometry providing millions of light curves of A-F type stars, we can now probe the occurrence rate of δ Scuti pulsations in detail. Using the 30 minutes cadence light curves from NASA's Tr…
Galaxy archaeology for wet mergers: Globular cluster age distributions in the Milky Way and nearby galaxies
Forbes, Duncan A.; McKenzie, Madeleine; Remus, Rhea-Silvia +1 more
Context. Identifying past wet merger activity in galaxies has been a longstanding issue in extragalactic formation history studies. Gaia's 6D kinematic measurements in our Milky Way (MW) have vastly extended the possibilities for Galactic archaeology, leading to the discovery of a multitude of early mergers in the MW's past. As recent work has est…
The classical T Tauri star CI Tau observed with SPIRou: magnetospheric accretion and planetary formation
Moutou, C.; Ménard, F.; Carmona, A. +15 more
We report new observations of the classical T Tauri star CI Tau with the SPIRou near-infrared spectropolarimeter and velocimeter at the Canada-France-Hawaii Telescope (CFHT) in late 2019, 2020, and 2022, complemented with observations obtained with the ESPaDOnS optical spectropolarimeter at CFHT in late 2020. From our SPIRou and ESPaDOnS spectra, …
Evidence of rapid hydrogen chloride uptake on water ice in the atmosphere of Mars
Montmessin, Franck; Fedorova, Anna A.; Trokhimovskiy, Alexander +5 more
In 2020, hydrogen chloride (HCl) in the gas phase was discovered in the atmosphere of Mars with the Atmospheric Chemistry Suite (ACS) onboard the Trace Gas Orbiter (TGO) mission (Korablev et al., 2021). Its volume mixing ratio (VMR) shows a seasonal increase of up to 5 ppbv during the perihelion season, followed by a sudden drop to undetectable le…
EPOCHS Paper - VIII. An insight into MIRI-selected galaxies in SMACS-0723 and the benefits of deep MIRI photometry in revealing AGN and the dusty universe
Conselice, Christopher J.; Li, Qiong; Ferreira, Leonardo +7 more
We present the analysis of the stellar population and star formation history of 181 MIRI selected galaxies at z = 0 - 3.5 in the massive galaxy cluster field SMACS J0723.3-7327, commonly referred to as SMACS0723, using the JWST Mid-Infrared Instrument (MIRI). We combine the data with the JWST Near Infrared Camera (NIRCam) catalogue, in conjunction…
A 3D view of multiple populations' kinematics in Galactic globular clusters
Dalessandro, E.; Fanelli, C.; Origlia, L. +8 more
We present the first 3D kinematic analysis of multiple stellar populations (MPs) in a representative sample of 16 Galactic globular clusters (GCs). For each GC in the sample, we studied the MP line-of-sight, plane-of-the-sky and 3D rotation, and velocity distribution anisotropy. The differences between first-population (FP) and second-population (…
Measuring the Mass–Radius Relation of White Dwarfs Using Wide Binaries
Brownstein, Joel R.; Hermes, J. J.; Stassun, Keivan G. +10 more
Measuring the mass–radius relation of individual white dwarfs is an empirically challenging task that has been performed for only a few dozen stars. We measure the white dwarf mass–radius relation using the gravitational redshifts and radii of 135 white dwarfs in wide binaries with main-sequence companions. We obtain the radial velocities of these…
Hard X-ray emission from blazars associated with high-energy neutrinos
Lutovinov, A. A.; Starobinsky, A. A.; Burenin, R. A. +4 more
Bright blazars were found to be prominent neutrino sources, and a number of IceCube events were associated with them. Evaluating high-energy photon emission of such blazars is crucial for better understanding of the processes and regions where neutrinos are produced. Here, we focus on hard X-ray emission observed by the SRG/ART-XC telescope, by th…
Photometric binaries in 14 Magellanic Cloud star clusters
Milone, Antonino P.; Lagioia, Edoardo P.; Marino, Anna F. +7 more
Binary stars play a major role in determining the dynamic evolution of star clusters. We used images collected with the Hubble Space Telescope to study fourteen star clusters of the Magellanic Clouds that span an age interval between ∼0.6 and 2.1 Gyr and masses of 104 − 105 M⊙. We estimated the fraction of binary s…
The AstroSat UV deep field north: direct determination of the UV luminosity function and its evolution from z 0.8-0.4
Saha, Kanak; Mondal, Chayan; Bhattacharya, Souradeep
We characterize the evolution of the rest-frame 1500 Å UV luminosity function (UVLF) from AstroSat/UVIT F154W and N242W imaging in the Great Observatories Origins Survey North (GOODS-N) field. With deep FUV observations, we construct the UVLF for galaxies at z$\lt 0.13$ and subsequently characterize it with a Schechter function fit. The fitted par…