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Flares, Rotation, and Planets of the AU Mic System from TESS Observations
Barclay, Thomas; Latham, David W.; Wittenmyer, Robert A. +20 more
AU Mic is a young (~24 Myr), pre-main-sequence M dwarf star that was observed in the first month of science observations of the Transiting Exoplanet Survey Satellite (TESS) and reobserved 2 years later. This target has photometric variability from a variety of sources that is readily apparent in the TESS light curves; spots induce modulation in th…
Optical superluminal motion measurement in the neutron-star merger GW170817
Anderson, Jay; Lu, Wenbin; Mooley, Kunal P.
The afterglow of the binary neutron-star merger GW1708171 gave evidence for a structured relativistic jet2-6 and a link3,7,8 between such mergers and short gamma-ray bursts. Superluminal motion, found using radio very long baseline interferometry3 (VLBI), together with the afterglow light curve provided …
No Such Thing as a Simple Flare: Substructure and Quasi-periodic Pulsations Observed in a Statistical Sample of 20 s Cadence TESS Flares
MacGregor, Meredith A.; Howard, Ward S.
A 20 s cadence Transiting Exoplanet Survey Satellite monitoring campaign of 226 low-mass flare stars during Cycle 3 recorded 3792 stellar flares of ≥1032 erg. We explore the time-resolved emission and substructure in 440 of the largest flares observed at high signal-to-noise, 97% of which released energies of ≥1033 erg. We di…
Do quasar X-ray and UV flux measurements provide a useful test of cosmological models?
Khadka, Narayan; Ratra, Bharat
The recent compilation of quasar (QSO) X-ray and ultraviolet (UV) flux measurements include QSOs that appear to not be standardizable via the X-ray luminosity and UV luminosity (LX-LUV) relation and so should not be used to constrain cosmological model parameters. Here, we show that the largest of seven sub-samples in this co…
Early Results from GLASS-JWST. VII. Evidence for Lensed, Gravitationally Bound Protoglobular Clusters at z = 4 in the Hubble Frontier Field A2744
Henry, Alaina; Zanella, A.; Vulcani, B. +29 more
We investigate the blue and optical rest-frame sizes (λ ≃ 2300-4000 Å) of three compact star-forming regions in a galaxy at z = 4 strongly lensed (×30, ×45, and ×100) by the Hubble Frontier Field galaxy cluster A2744 using GLASS-ERS James Webb Space Telescope (JWST)/NIRISS imaging at 1.15 µm, 1.50 µm, and 2.0 µm with a point-spre…
The observed multiplicity properties of B-type stars in the Galactic young open cluster NGC 6231
Evans, C. J.; Sana, H.; Mahy, L. +3 more
Context. It is well known that massive O stars are frequently (if not always) found in binary or higher-order multiple systems, but this fact has been less robustly investigated for the lower mass range of the massive stars, represented by B-type stars. Obtaining the binary fraction and orbital parameter distributions of B-type stars is crucial to…
The DECam Local Volume Exploration Survey Data Release 2
Bacon, D.; Bechtol, K.; Smith, M. +125 more
We present the second public data release (DR2) from the DECam Local Volume Exploration survey (DELVE). DELVE DR2 combines new DECam observations with archival DECam data from the Dark Energy Survey, the DECam Legacy Survey, and other DECam community programs. DELVE DR2 consists of ~160,000 exposures that cover >21,000 deg2 of the hi…
Identifying quiescent compact objects in massive Galactic single-lined spectroscopic binaries
Shenar, T.; Sana, H.; Hawcroft, C. +13 more
Context. The quest to detect dormant stellar-mass black holes (BHs) in massive binaries (i.e. OB+BH systems) is challenging; only a few candidates have been claimed to date, all of which must still be confirmed.
Aims: To search for these rare objects, we study 32 Galactic O-type stars that were reported as single-lined spectroscopic binaries …
The Warm Neptune GJ 3470b Has a Polar Orbit
Cochran, William D.; Endl, Michael; Mahadevan, Suvrath +34 more
The warm Neptune GJ 3470b transits a nearby (d = 29 pc) bright slowly rotating M1.5-dwarf star. Using spectroscopic observations during two transits with the newly commissioned NEID spectrometer on the WIYN 3.5 m Telescope at Kitt Peak Observatory, we model the classical Rossiter-McLaughlin effect, yielding a sky-projected obliquity of $\lambda ={…
An Improved Calibration of the Wavelength Dependence of Metallicity on the Cepheid Leavitt Law
Riess, Adam G.; Breuval, Louise; Anderson, Richard I. +2 more
The Cepheid period-luminosity (PL) relation (or Leavitt law) has served as the first rung of the most widely used extragalactic distance ladder and is central to the determination of the local value of the Hubble constant (H 0). We investigate the influence of metallicity on Cepheid brightness, a term that significantly improves the ove…