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On the Orbit of the Binary Brown Dwarf Companion GL229 Ba and Bb
Henning, Thomas; Mérand, Antoine; Johnstone, Doug +21 more
The companion GL229B was recently resolved by Xuan et al. as a tight binary of two brown dwarfs (Ba and Bb) through VLTI-GRAVITY interferometry and Very Large Telescope-CRIRES+ radial velocity (RV) measurements. Here, we present Bayesian models of the interferometric and RV data in additional detail, along with an updated outer orbit of the brown …
Discoveries and Properties of EL CVn–type Binaries in the TESS Survey
Han, Zhanwen; Chen, Xuefei; Li, Zhenwei +5 more
EL CVn–type systems represent a rare evolutionary stage in binary star evolution, providing ideal laboratories for investigating stable mass-transfer processes and the formation of extremely low-mass white dwarfs (ELM WDs). The Transiting Exoplanet Survey Satellite (TESS) has delivered an extensive collection of high-precision time-domain photomet…
ALMA Observations of Peculiar Embedded Icy Objects
Onaka, Takashi; Sakon, Itsuki; Shimonishi, Takashi
We report the results of molecular line observations with the Atacama Large Millimeter/submillimeter Array (ALMA) toward two peculiar icy objects, which were discovered serendipitously by infrared spectroscopic survey of the Galactic plane with the AKARI satellite. Previous infrared observations have reported that both objects show deep ice and du…
Eight New Candidate Multiplanet Systems among TESS Objects of Interest
Kunimoto, Michelle; Munavar Hussain, Mohamed Jassim
We present a search of the TESS Object of Interest (TOI) Catalog for new multiplanet systems. We perform a Box Least Squares search on light curves prepared by the Quick-Look Pipeline to recover known candidates and perform a targeted search for additional candidates in each system. Following vetting and manual inspection, we present eight new pla…
Planetary Mass Determinations from a Simplified Photodynamical Model—Application to the Complete Kepler Dataset
Aharonson, Oded; Ofir, Aviv; Yoffe, Gideon
We use PyDynamicaLC, a model using the least number of—and the least correlated—degrees of freedom needed to derive a photodynamical model, to describe some of the smallest—and lowest-transit-timing-variation-amplitude—of the Kepler planets. We successfully analyze 64 systems containing 218 planets, for 88 of which we were able to determine signif…
Spectra of standing kink waves in loops and the effects of the lower solar atmosphere
Gao, Yuhang; Van Doorsselaere, Tom; Lim, Daye +1 more
Context. Understanding the effects of the lower solar atmosphere on the spectrum of standing kink oscillations of coronal loops, in both the decaying and decayless regime, is essential for developing more advanced tools for coronal seismology. Aims. We aim to reveal the effects of the chromosphere on the spatial profiles and frequencies of the sta…
The ultraviolet luminosity function of star-forming galaxies between redshifts of 0.4 and 0.6
McHardy, I.; Page, M. J.; Seymour, N. +7 more
We combine ultraviolet imaging of the
The Surprising Long-Term Evolution of the ULXP NGC 7793 P13
Fürst, Felix; Walton, Dominic J.; Brightman, Murray +2 more
The ultra-luminous x-ray pulsar (ULXP) NGC 7793 P13 has been regularly monitored with XMM-Newton, NuSTAR, and Swift for the last 8 years. Here, we present the latest results of this monitoring campaign with respect to the pulse period evolution and spectral variability. We find that since the source recovered from an x-ray low state in 2020–2022 t…
Hinode/EIS Observation of the Alfvénic Fluctuations in the Quiet Sun
Young, Peter R.; Morton, Richard; Tajfirouze, Edris
Alfvénic fluctuations in the corona are regularly observed in EUV imaging and infrared spectroscopic data. We report here on the Doppler velocity fluctuations within the data from the Extreme-Ultraviolet Imaging Spectrometer (EIS) on board Hinode. The capabilities of EIS provide an opportunity to detect fluctuations in the solar atmosphere and con…
Insights into the origins of Phobos and Deimos based on a spectral comparison with small bodies and Martian materials
Fornasier, S.; Doressoundiram, A.; Mahlke, M. +4 more
Context. The origins of Phobos and Deimos are highly debated, and several distinct hypotheses have been put forth. The two most widely accepted theories are that (1) the two moons were created by a giant impact in analogy to the Earth-Moon system, whereby a debris disk was formed that then formed the two moons by accretion; and that (2) the moons …