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Hot subdwarf wind models with accurate abundances. II. Helium-dominated merger products CD-46 8926 and CD-51 11879
Krtička, J.; Vučković, M.; Janík, J. +3 more
Context. Helium-dominated subdwarfs are core helium burning stars stripped of their envelope. The nuclear evolution of these stars alters surface abundances. Modified abundances impact the strength of the stellar wind.
Aims: We aim to understand the influence of modified surface abundances on the strength of the stellar wind in the helium-dom…
Trials and Tribulations in the Reanalysis of KELT-24 b: A Case Study for the Importance of Stellar Modeling
Vanderburg, Andrew; Stassun, Keivan G.; Wittenmyer, Robert A. +21 more
We present a new analysis of the KELT-24 system, comprising a well-aligned hot Jupiter, KELT-24 b, and a bright (V = 8.3), nearby (d = 96.9 pc) F-type host star. KELT-24 b was independently discovered by two groups in 2019, with each reporting best-fit stellar parameters that were notably inconsistent. Here, we present three independent analyses o…
Improved Empirical Backgrounds for JWST NIRISS Image/Wide-field Slitless Spectroscopy Data Reduction
Momcheva, Ivelina G.; Hviding, Raphael E.; Clarke, Leonardo
The Near Infrared Imager and Slitless Spectrograph (NIRISS) on the James Webb Space Telescope (JWST) is a versatile instrument for collecting imaging and wide-field slitless spectroscopy (WFSS) data for surveys of galaxy clusters, emission-line galaxies, stellar populations, and more. Dispersed zodiacal light imprints distinct structures on space-…
Disk Evolution Study Through Imaging of Nearby Young Stars (DESTINYS): Dynamical Evidence of a Spiral-Arm-Driving and Gap-Opening Protoplanet from SAO 206462 Spiral Motion
Ren, Bin B.; Ménard, François; Bae, Jaehan +8 more
In the early stages of planetary system formation, young exoplanets gravitationally interact with their surrounding environments and leave observable signatures on protoplanetary disks. Among these structures, a pair of nearly symmetric spiral arms can be driven by a giant protoplanet. For the double-spiraled SAO 206462 protoplanetary disk, we obt…
3 µm Phase Curves of Main-belt Asteroids from NEOWISE Photometry
Oszkiewicz, Dagmara; Masiero, Joseph; Chanover, Nancy +1 more
The shapes of asteroid phase curves are influenced by the physical properties of asteroid surfaces. The variation of an asteroid's brightness as a function of the solar phase angle can tell us about surface properties such as grain size distribution, roughness, porosity, and composition. Phase curves are traditionally derived from photometric obse…
Modeling of the Exoplanet HAT-P-11b Magnetosphere
Alexeev, I. I.; Belenkaya, E. S.; Kalegaev, V. V.
The magnetospheric model of the HAT-P-11b magnetic field has been constructed based on the available data on the magnetic field of the star HAT-P-11 and its closest exoplanet HAT-P-11b, as well as the information on the stellar wind in this system. It has been shown how the magnitude and orientation of the interplanetary magnetic field control the…
The Keck-HGCA Pilot Survey - II. Direct imaging discovery of HD 63754 B, a 20 au massive companion near the hydrogen burning limit
Jensen-Clem, Rebecca; Salama, Maïssa; Currie, Thayne +15 more
We present the joint astrometric and direct imaging discovery, mass measurement, and orbital analysis of HD 63754 B (HIP 38216 B), a companion near the stellar-substellar boundary orbiting
An alternative interpretation of magnetars' traits deduced from the observational data on their outburst fluxes and spectra
Ardavan, Houshang
By applying the Efron-Petrosian method to the fluxes S and distances D of the magnetars listed in the Magnetar Outburst Online Catalogue, we show that the observational data are consistent with the dependence
Thermal X-ray emission in the western half of the LMC superbubble 30 Dor C
Zhou, Ping; Chen, Yang; Sun, Wei +4 more
While 30 Dor C is a unique superbubble in the Large Magellanic Cloud for its luminous non-thermal X-ray emission, the thermal X-ray emission it emanates has not yet been thoroughly investigated and well constrained. Based on the separate ~1 Ms deep XMM-Newton and Chandra observations, we report the discovery of the thermally emitting plasma in som…
Evidence for Type Ib/c Origin of the Supernova Remnant G292.0+1.8
Katsuda, Satoru; Sato, Toshiki; Uchida, Hiroyuki +6 more
Circumstellar material (CSM) produced by mass loss from massive stars (≳10 M ⊙) through strong stellar winds or binary stripping provides rich information for understanding progenitors of core-collapse supernova remnants. In this paper we present a grating spectroscopy of a Galactic SNR G292.0+1.8, which is claimed to be a Type Ib/c rem…