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Efficient Point-spread Function Modeling with ShOpt.jl: A Point-spread Function Benchmarking Study with JWST NIRCam Imaging
Casey, Caitlin M.; Kartaltepe, Jeyhan S.; Koekemoer, Anton M. +14 more
With their high angular resolutions of 30–100 mas, large fields of view, and complex optical systems, imagers on next-generation optical/near-infrared space observatories, such as the Near-Infrared Camera (NIRCam) on the James Webb Space Telescope, present new opportunities for science and also new challenges for empirical point-spread function (P…
Climbing the Cliffs: Classifying Young Stellar Objects in the Cosmic Cliffs JWST Data Using a Probabilistic Random Forest
Di Francesco, J.; Crompvoets, B. L.; Teimoorinia, H. +1 more
Among the first observations released to the public from the JWST was a section of the star-forming region NGC 3324 known colloquially as the "Cosmic Cliffs." We build a photometric catalog of the region and test the ability of using the probabilistic random forest machine-learning method to identify its young stellar objects (YSOs). We find 450 c…
Resolving the pulsation contents of 13 δ Scuti stars with TESS and K2
Zhou, Ai-Ying
Using the TESS and Kepler K2 light curve archives, I have reanalyzed 13 known δ Scuti stars. AD Ari is now reclassified as a rotating ellipsoidal binary variable. EX Cnc and HD 73712 are reclassified as hybrid δ Sct-γ Dor pulsators. EX Cnc turns out to be an enticing asteroseismic target because of its three distinct groups of pulsation frequencie…
Breaking degeneracies in exoplanetary parameters through self-consistent atmosphere–interior modelling
Lagrange, A. -M.; Wilkinson, C.; Charnay, B. +5 more
Context. With a new generation of observational instruments largely dedicated to exoplanets (i.e. JWST, ELTs, PLATO, and Ariel) providing atmospheric spectra and mass and radius measurements for large exoplanet populations, the planetary models used to understand the findings are being put to the test. Aims. We seek to develop a new planetary mode…
Dark matter limits from the tip of the red giant branch of globular clusters
Hong, Haozhi; Vincent, Aaron C.
Capture and annihilation of weakly interacting massive particle (WIMP)-like dark matter in red giant stars can lead to faster-than-expected ignition of the helium core, and thus a lower tip of the red giant branch (TRGB) luminosity. We use Gaia data to place constraints on the dark matter-nucleon cross section using 22 globular clusters with measu…
Discovery of a Barium Blue Straggler Star in M67 and "Sighting" of Its White Dwarf Companion
Jadhav, Vikrant V.; Reddy, Arumalla B. S.; Subramaniam, Annapurni +1 more
We report the discovery of a barium blue straggler star (BSS) in M67, exhibiting enhancements in slow neutron-capture (s-)process elements. Spectroscopic analysis of two BSSs (WOCS 9005 & WOCS 1020) and four stars located near the main-sequence turn-off using GALAH spectra, showed that WOCS 9005 has a significantly high abundance of the s-proc…
Six new eccentric eclipsing systems with a third body
Wolf, M.; Zasche, P.; Henzl, Z.
We present the discovery of six new triple stellar system candidates composed of an inner eccentric-orbit eclipsing binary with an apsidal motion. These stars were studied using new, precise TESS light curves and a long-term collection of older photometric ground-based data. These data were used for the monitoring of ETVs (eclipse timing variation…
Detecting Exoplanet Transits with the Next Generation of X-Ray Telescopes
Cilley, Raven; King, George W.; Corrales, Lía
Detecting exoplanet transits at X-ray wavelengths would provide a window into the effects of high-energy irradiation on the upper atmospheres of planets. However, stars are relatively dim in the X-ray, making exoplanet transit detections difficult with current X-ray telescopes. To date, only one exoplanet (HD 189733 b) has an X-ray transit detecti…
Phase angle dependence of the dust cross section in a cometary coma. A simple numerical model
Agarwal, J.; Markkanen, J.; Keiser, F.
Context. Rosetta/OSIRIS took optical measurements of the intensity of scattered light from the coma of 67P/Churyumov-Gerasimenko over a wide range of phase angles. These data have been used to measure the phase angle dependent radiance profile of the dust coma.
Aims: We want to provide information about the column area densities of the dust c…
Spatial Relationship between CMEs and Prominence Eruptions during SC 24 and SC 25
Gopalswamy, Nat; Yashiro, Seiji; Michalek, Grzegorz +2 more
During their propagation, coronal mass ejections (CMEs) and prominences sometimes display a nonradial motion. During the years after the solar minimum, the CME central position angle tended to be offset closer to the equator compared to that of the associated prominence eruptions (PE). No such effect was observed during solar maximum. The purpose …