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Radio footprints of a minor merger in the Shapley Supercluster: From supercluster down to galactic scales
Di Gennaro, G.; Diego, J. M.; Rossetti, M. +29 more
Context. The Shapley Supercluster (⟨z⟩≈0.048) contains several tens of gravitationally bound clusters and groups, making it an ideal subject for radio studies of cluster mergers.
Aims: We used new high sensitivity radio observations to investigate the less energetic events of mass assembly in the Shapley Supercluster from supercluster down to…
First Peek with JWST/NIRCam Wide-field Slitless Spectroscopy: Serendipitous Discovery of a Strong [O III]/Hα Emitter at z = 6.11
Koekemoer, Anton M.; Pirzkal, Nor; Gennaro, Mario +16 more
We report the serendipitous discovery of an [O III] λ λ4959/5007 and Hα line emitter in the Epoch of Reionization (EoR) with the James Webb Space Telescope (JWST) commissioning data taken in the NIRCam wide-field slitless spectroscopy (WFSS) mode. Located ~55″ away from the flux calibrator P330-E, this galaxy exhibits bright [O III] λ λ4959/5007 a…
Tentative Evidence for Water Vapor in the Atmosphere of the Neptune-sized Exoplanet HD 106315c
Gorjian, Varoujan; Fortney, Jonathan J.; Mikal-Evans, Thomas +27 more
We present a transmission spectrum for the Neptune-sized exoplanet HD 106315c from optical to infrared wavelengths based on transit observations from the Hubble Space Telescope/Wide Field Camera 3, K2, and Spitzer. The spectrum shows tentative evidence for a water absorption feature in the 1.1-1.7 µm wavelength range with a small amplitude o…
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…