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The Sloan Digital Sky Survey Reverberation Mapping Project: UV-Optical Accretion Disk Measurements with the Hubble Space Telescope
Trump, Jonathan R.; Brandt, W. N.; Shen, Yue +10 more
We present accretion-disk structure measurements from UV-optical reverberation mapping (RM) observations of a sample of eight quasars at 0.24 < z < 0.85. Ultraviolet photometry comes from two cycles of Hubble Space Telescope monitoring, accompanied by multiband optical monitoring by the Las Cumbres Observatory network and Liverpool Telescope…
International Asteroid Warning Network Timing Campaign: 2019 XS
Popescu, Marcel; Granvik, Mikael; Chambers, Kenneth C. +69 more
As part of the International Asteroid Warning Network's observational exercises, we conducted a campaign to observe near-Earth asteroid 2019 XS around its close approach to Earth on 2021 November 9. The goal of the campaign was to characterize errors in the observation times reported to the Minor Planet Center, which become an increasingly importa…
The Great Flare of 2021 November 19 on AD Leonis. Simultaneous XMM-Newton and TESS observations
Stelzer, B.; Caramazza, M.; Raetz, S. +2 more
We present a detailed analysis of a superflare on the active M dwarf star AD Leonis. The event presents a rare case of a stellar flare that was simultaneously observed in X-rays (with XMM-Newton) and in the optical (with the Transiting Exoplanet Survey Satellite, TESS). The radiated energy in the 0.2 − 12 keV X-ray band (1.26 ± 0.01 × 1033
Linking Extragalactic Transients and Their Host Galaxy Properties: Transient Sample, Multiwavelength Host Identification, and Database Construction
French, K. Decker; Zabludoff, Ann; Behroozi, Peter +7 more
Understanding the preferences of transient types for host galaxies with certain characteristics is key to studies of transient physics and galaxy evolution, as well as to transient identification and classification in the LSST era. Here we describe a value-added database of extragalactic transients-supernovae, tidal disruption events, gamma-ray bu…
Water content trends in K2-138 and other low-mass multi-planetary systems
Deleuil, M.; Morel, T.; Mousis, O. +5 more
Context. Both rocky super-Earths and volatile-rich sub-Neptunes have been found simultaneously in multi-planetary systems, suggesting that these systems are appropriate to study different composition and formation pathways within the same environment.
Aims: We perform a homogeneous interior structure analysis of five multi-planetary systems t…
Acceleration of Solar Energetic Particles through CME-driven Shock and Streamer Interaction
Susino, Roberto; West, Matthew J.; Frassati, Federica +5 more
On 2013 June 21, a solar prominence eruption was observed, accompanied by an M2.9 class flare, a fast coronal mass ejection, and a type II radio burst. The concomitant emission of solar energetic particles (SEPs) produced a significant proton flux increase, in the energy range 4-100 MeV, measured by the Low and High Energy Telescopes on board the …
Damped Lyα Absorbers in Star-forming Galaxies at z < 0.15 Detected with the Hubble Space Telescope and Implications for Galactic Evolution
Bowen, David V.; Noterdaeme, Pasquier; York, Donald G. +4 more
We report Hubble Space Telescope Cosmic Origins Spectrograph spectroscopy of 10 quasars with foreground star-forming galaxies at 0.02 < z < 0.14 within impact parameters of ~1-7 kpc. We detect damped/sub-damped Lyα (DLA/sub-DLA) absorption in 100% of cases where no higher-redshift Lyman-limit systems extinguish the flux at the expected wavel…
Candidate Eclipsing Binary Systems with a δ Scuti Star in Northern TESS Field
Kahraman Aliçavuş, F.; Aliçavuş, F.; Ekinci, Ö. +4 more
The existence of pulsating stars in eclipsing binaries has been known for decades. These types of objects are extremely valuable systems for astronomical studies as they exhibit both eclipse and pulsation variations. The eclipsing binaries are the only way to directly measure the mass and radius of stars with a good accuracy (≤1%), while the pulsa…
Three new high-mass X-ray binaries in the Large Magellanic Cloud
Haberl, F.; Udalski, A.; Vasilopoulos, G. +4 more
Context. The Magellanic Clouds host a large population of high-mass X-ray binary (HMXB) systems, and although the Large Magellanic Cloud (LMC) is an order of magnitude more massive than the Small Magellanic Cloud, there are significantly fewer known HMXBs in the former.
Aims: We conducted a search for new HMXBs in XMM-Newton observations that…
The Rapid Rotation of the Strongly Magnetic Ultramassive White Dwarf EGGR 156
Hermes, J. J.; Vanderbosch, Zachary P.; Williams, Kurtis A.
The distribution of white dwarf rotation periods provides a means for constraining angular momentum evolution during the late stages of stellar evolution, as well as insight into the physics and remnants of double degenerate mergers. Although the rotational distribution of low-mass white dwarfs is relatively well constrained via asteroseismology, …