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An eclipsing 47 min double white dwarf binary at 400 pc
Kepler, S. O.; Hermes, J. J.; Dhillon, V. S. +20 more
We present the discovery of the eclipsing double white dwarf (WD) binary WDJ 022558.21-692025.38 that has an orbital period of 47.19 min. Following identification with the Transiting Exoplanet Survey Satellite, we obtained time series ground based spectroscopy and high-speed multiband ULTRACAM photometry which indicate a primary DA WD of mass $0.4…
ALMA 1.1 mm Observations of a Conservative Sample of High-redshift Massive Quiescent Galaxies in SHELA
Papovich, Casey; Finkelstein, Steven L.; Bagley, Micaela B. +11 more
We present a sample of 30 massive (log(M */M ⊙) > 11) z = 3-5 quiescent galaxies selected from the Spitzer-HETDEX Exploratory Large Area (SHELA) Survey and observed at 1.1 mm with Atacama Large Millimeter/submillimeter Array (ALMA) Band 6 observations. These ALMA observations would detect even modest levels of dust-obscure…
Astro-COLIBRI 2—An Advanced Platform for Real-Time Multi-Messenger Discoveries
Reichherzer, Patrick; Schüssler, Fabian; Lefranc, Valentin +3 more
The study of flaring astrophysical events in the multi-messenger approach requires instantaneous follow-up observations to better understand the nature of these events through complementary observational data. We present Astro-COLIBRI as a platform that integrates specific tools in the real-time multi-messenger ecosystem. The Astro-COLIBRI platfor…
Discovery of the Exceptionally Short Period Ultracool Dwarf Binary LP 413-53AB
Burgasser, Adam J.; Hsu, Chih-Chun; Theissen, Christopher A.
We report the detection of large-amplitude, rapid radial velocity (RV) variations and line-splitting in high-resolution Keck/NIRSPEC spectra of the M9 dwarf LP 413-53. We attribute these features to binary motion. Analyzing data spanning 15 yr, we infer a preliminary orbital period of 0.7106156 ± 0.0000002 days, an eccentricity of 0.0088 ± 0.0017,…
Hot white dwarfs and pre-white dwarfs discovered with SALT
Werner, K.; Jeffery, C. S.; Miszalski, B. +3 more
The Southern African Large Telescope survey of helium-rich hot subdwarfs aims to explore evolutionary pathways among groups of highly evolved stars. The selection criteria mean that several hot white dwarfs and related objects have also been included. This paper reports the discovery and analysis of eight new very hot white dwarf and pre-white dwa…
A systematic validation of hot Neptunes in TESS data
Bieryla, Allyson; Howell, Steve B.; Ziegler, Carl +26 more
We statistically validated a sample of hot Neptune candidates applying a two-step vetting technique using DAVE and TRICERATOPS. We performed a systematic validation of 250 transit-like events in the Transiting Exoplanet Survey Satellite archive in the parameter region defined by $P\le 4\, \text{d}$ and $3\, {\rm R}_{\oplus }\le R \le 5\, {\rm R}_{…
The Metallicity and Distance of Leo A from Blue Supergiants
Bresolin, Fabio; Kudritzki, Rolf-Peter; Urbaneja, Miguel A.
We have obtained high-quality spectra of blue supergiant candidates in the dwarf irregular galaxy Leo A with the Low Resolution Imaging Spectrometer at the Keck I telescope. From the quantitative analysis of seven B8-A0 stars, we derive a mean metallicity [Z] = -1.35 ± 0.08, in excellent agreement with the gas-phase chemical abundance. From the st…
Comprehensive coverage of particle acceleration and kinetic feedback from the stellar mass black hole V404 Cygni
Motta, S. E.; Miller-Jones, J. C. A.; Williams, D. R. A. +8 more
We present analysis of comprehensive radio observations of the black hole V404 Cyg during its 2015 outburst. These data represent the best ever coverage of jet production and particle acceleration from any black hole. We report for the first time a clear and near-linear flux-rms correlation in the radio flux densities. Investigation of individual …
Sub-second infrared variability from the archetypal accreting neutron star 4U 1728-34
Stella, L.; Díaz Trigo, M.; Altamirano, D. +23 more
We report on the first simultaneous high-time resolution X-ray and infrared (IR) observations of a neutron star low mass X-ray binary in its hard state. We performed $\approx 2\,$ h of simultaneous observations of 4U 1728-34 using HAWK-I@VLT, XMM-Newton, and NuSTAR. The source displayed significant X-ray and IR variability down to sub-second time-…
An ALMA Survey of M-dwarfs in the Beta Pictoris Moving Group with two new debris disc detections
Kral, Quentin; Wyatt, Mark C.; Lestrade, Jean-François +4 more
Previous surveys in the far-infrared have found very few, if any, M-dwarf debris discs among their samples. It has been questioned whether M-dwarf discs are simply less common than earlier types, or whether the low detection rate derives from the wavelengths and sensitivities available to those studies. The highly sensitive, long-wavelength Atacam…