Search Publications
A fast-rising tidal disruption event from a candidate intermediate-mass black hole
Rest, A.; Angus, C. R.; Foley, R. J. +36 more
Massive black holes (BHs) at the centres of massive galaxies are ubiquitous. The population of BHs within dwarf galaxies, on the other hand, is not yet known. Dwarf galaxies are thought to harbour BHs with proportionally small masses, including intermediate-mass BHs, with masses 102 < MBH < 106 solar masses (…
Predicting Solar Flares Using CNN and LSTM on Two Solar Cycles of Active Region Data
Chen, Yang; Gombosi, Tamas; Bobra, Monica G. +5 more
We consider the flare prediction problem that distinguishes flare-imminent active regions that produce an M- or X-class flare in the succeeding 24 hr, from quiet active regions that do not produce any flares within ±24 hr. Using line-of-sight magnetograms and parameters of active regions in two data products covering Solar Cycles 23 and 24, we tra…
Evolution of a Relativistic Outflow and X-Ray Corona in the Extreme Changing-look AGN 1ES 1927+654
Fabian, Andrew C.; Remillard, Ronald A.; Ricci, Claudio +8 more
1ES 1927+654 is a paradigm-defying active galactic nucleus (AGN) and one of the most peculiar X-ray nuclear transients. In early 2018, this well-known AGN underwent a changing-look event, in which broad optical emission lines appeared and the optical flux increased. Yet, by 2018 July, the X-ray flux had dropped by over two orders of magnitude, ind…
CO Line Emission Surfaces and Vertical Structure in Midinclination Protoplanetary Disks
Wilner, David J.; Ilee, John D.; Andrews, Sean M. +18 more
High spatial resolution CO observations of midinclination (≈30°-75°) protoplanetary disks offer an opportunity to study the vertical distribution of CO emission and temperature. The asymmetry of line emission relative to the disk major axis allows for a direct mapping of the emission height above the midplane, and for optically thick, spatially re…
Discovery of 74 new bright ZZ Ceti stars in the first three years of TESS
Kepler, S. O.; Hermes, J. J.; Bell, Keaton J. +17 more
We report the discovery of 74 new pulsating DA white dwarf stars, or ZZ Cetis, from the data obtained by the Transiting Exoplanet Survey Satellite mission, from Sectors 1 to 39, corresponding to the first 3 cycles. This includes objects from the Southern hemisphere (Sectors 1-13 and 27-39) and the Northern hemisphere (Sectors 14-26), observed with…
A Tendency Toward Alignment in Single-star Warm-Jupiter Systems
Rice, Malena; Howard, Andrew W.; Dai, Fei +9 more
The distribution of spin-orbit angles for systems with wide-separation, tidally detached exoplanets offers a unique constraint on the prevalence of dynamically violent planetary evolution histories. Tidally detached planets provide a relatively unbiased view of the primordial stellar obliquity distribution, as they cannot tidally realign within th…
Metallicities of Five z > 5 Emission-line Galaxies in SMACS 0723 Revealed by JWST
Barger, A. J.; Cowie, L. L.; Taylor, A. J.
JWST's Early Release Observations of the lensing cluster SMACS J0723.3-7327 have given an unprecedented spectroscopic look into the high-redshift universe. These observations reveal five galaxies at z > 5. All five have detectable [O III]λ4363 line emission, indicating that these galaxies have high temperatures and low metallicities and that th…
Detecting clusters of galaxies and active galactic nuclei in an eROSITA all-sky survey digital twin
Salvato, M.; Nandra, K.; Merloni, A. +15 more
Context. The extended ROentgen Survey with an Imaging Telescope Array (eROSITA) on board the Spectrum-Roentgen-Gamma (SRG) observatory is revolutionizing X-ray astronomy. The mission provides unprecedented samples of active galactic nuclei (AGN) and clusters of galaxies, with the potential of studying astrophysical properties of X-ray sources and …
LIDA: The Leiden Ice Database for Astrochemistry
van Dishoeck, E. F.; Rocha, W. R. M.; Rachid, M. G. +3 more
Context. High-quality vibrational spectra of solid-phase molecules in ice mixtures and for temperatures of astrophysical relevance are needed to interpret infrared observations toward protostars and background stars. Such data are collected worldwide by several laboratory groups in support of existing and upcoming astronomical observations. Over t…
Mapping the magnetic field in the Taurus/B211 filamentary cloud with SOFIA HAWC + and comparing with simulation
André, Philippe; Rho, Jeonghee; Li, Pak Shing +4 more
Optical and infrared polarization mapping and recent Planck observations of the filametary cloud L1495 in Taurus show that the large-scale magnetic field is approximately perpendicular to the long axis of the cloud. We use the HAWC + polarimeter on SOFIA to probe the complex magnetic field in the B211 part of the cloud. Our results reveal a disper…