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First Resolution of Microlensed Images
Kochanek, C. S.; Gould, Andrew; Stanek, K. Z. +12 more
We employ Very Large Telescope Interferometer GRAVITY to resolve, for the first time, the two images generated by a gravitational microlens. The measurements of the image separation {{Δ }}{θ }-,+=3.78+/- 0.05 mas, and hence the Einstein radius θ E = 1.87 ± 0.03 mas, are precise. This demonstrates the robustness of the method,…
Multiple water band detections in the CARMENES near-infrared transmission spectrum of HD 189733 b
Schmitt, J. H. M. M.; Alonso-Floriano, F. J.; Sánchez-López, A. +27 more
Aims: We explore the capabilities of CARMENES for characterising hot-Jupiter atmospheres by targeting multiple water bands, in particular, those at 1.15 and 1.4 µm. Hubble Space Telescope observations suggest that this wavelength region is relevant for distinguishing between hazy and/or cloudy and clear atmospheres.
Methods: We obs…
HD 202772A b: A Transiting Hot Jupiter around a Bright, Mildly Evolved Star in a Visual Binary Discovered by TESS
Trifonov, Trifon; Reffert, Sabine; Kürster, Martin +58 more
We report the first confirmation of a hot Jupiter discovered by the Transiting Exoplanet Survey Satellite (TESS) mission: HD 202772A b. The transit signal was detected in the data from TESS Sector 1, and was confirmed to be of planetary origin through radial velocity (RV) measurements. HD 202772A b is orbiting a mildly evolved star with a period o…
A 10,000-solar-mass black hole in the nucleus of a bulgeless dwarf galaxy
Gallo, Elena; Woo, Jong-Hak; Hodges-Kluck, Edmund +5 more
The motions of gas and stars in the nuclei of nearby galaxies have demonstrated that massive black holes are common1 and that their masses correlate with the stellar velocity dispersion σ★ of the bulge2-4. This correlation suggests that massive black holes and galaxies influence each other's growth5-7. D…
Collisionless Magnetic Reconnection and Waves: Progress Review
Khotyaintsev, Yuri V.; Graham, Daniel B.; Vaivads, Andris +1 more
Magnetic reconnection is a fundamental process whereby microscopic plasma processes cause macroscopic changes in magnetic field topology, leading to explosive energy release. Waves and turbulence generated during the reconnection process can produce particle diffusion, and anomalous resistivity, as well as heat the plasma and accelerate plasma par…
The MOSDEF Survey: A Census of AGN-driven Ionized Outflows at z = 1.4-3.8
Siana, Brian; Azadi, Mojegan; Aird, James +13 more
Using data from the MOSFIRE Deep Evolution Field (MOSDEF) survey, we present a census of active galactic nucleus (AGN)-driven ionized outflows in a sample of 159 AGNs at 1.4 ≤ z ≤ 3.8. The sample spans AGN bolometric luminosities of 1044-47 erg s-1 and includes both quiescent and star-forming galaxies extending across 3 order…
The Peculiar Volatile Composition of CO-dominated Comet C/2016 R2 (PanSTARRS)
Villanueva, Geronimo L.; Cochran, Anita L.; Bauer, James +14 more
Comet C/2016 R2 (PanSTARRS) has a peculiar volatile composition, with CO being the dominant volatile, as opposed to H2O, and one of the largest N2/CO ratios ever observed in a comet. Using observations obtained with the Spitzer Space Telescope, NASA’s Infrared Telescope Facility, the 3.5 m Astrophysical Research Consortium te…
Proper Motions of Stellar Streams Discovered in the Dark Energy Survey
Wang, M. Y.; Kuehn, K.; Li, T. S. +14 more
We cross-match high-precision astrometric data from Gaia DR2 with accurate multiband photometry from the Dark Energy Survey (DES) DR1 to confidently measure proper motions for nine stellar streams in the DES footprint: Aliqa Uma, ATLAS, Chenab, Elqui, Indus, Jhelum, Phoenix, Tucana III, and Turranburra. We determine low-confidence proper-motion me…
Linking galaxy structural properties and star formation activity to black hole activity with IllustrisTNG
Somerville, Rachel S.; Torrey, Paul; Vogelsberger, Mark +11 more
We study the connection between active galactic nuclei (AGN) and their host galaxies through cosmic time in the large-scale cosmological IllustrisTNG simulations. We first compare BH properties, i.e. the hard X-ray BH luminosity function, AGN galaxy occupation fraction, and distribution of Eddington ratios, to available observational constraints. …
Relative Alignment between the Magnetic Field and Molecular Gas Structure in the Vela C Giant Molecular Cloud Using Low- and High-density Tracers
Ward-Thompson, Derek; Fissel, Laura M.; Friesen, Rachel +37 more
We compare the magnetic field orientation for the young giant molecular cloud Vela C inferred from 500 µm polarization maps made with the BLASTPol balloon-borne polarimeter to the orientation of structures in the integrated line emission maps from Mopra observations. Averaging over the entire cloud we find that elongated structures in integr…