Search Publications
Imaging [CI] around HD 131835: reinterpreting young debris discs with protoplanetary disc levels of CO gas as shielded secondary discs
Kral, Quentin; Wyatt, Mark C.; Marino, Sebastian +2 more
Despite being >10 Myr, there are ∼10 debris discs with as much CO gas as in protoplanetary discs. Such discs have been assumed to be 'hybrid', i.e. with secondary dust but primordial gas. Here, we show that both the dust and gas in such systems could instead be secondary, with the high CO content caused by accumulation of neutral carbon (C…
In the Galactic Disk, Stellar [Fe/H] and Age Predict Orbits and Precise [X/Fe]
Rix, H. -W.; Hawkins, K.; Bird, J. C. +4 more
We explore the structure of the element abundance-age-orbit distribution of the stars in the Milky Way’s low-α disk, by (re-)deriving precise [Fe/H], [X/Fe], and ages, along with orbits, for red clump stars from the APOGEE survey. There has been a long-standing theoretical expectation and observational evidence that metallicity ([Fe/H]) and age ar…
Cosmological constraints on post-Newtonian parameters in effectively massless scalar-tensor theories of gravity
Rossi, Massimo; Ballardini, Mario; Braglia, Matteo +4 more
We study the cosmological constraints on the variation of Newton's constant and on post-Newtonian parameters for simple models of the scalar-tensor theory of gravity beyond the extended Jordan-Brans-Dicke theory. We restrict ourselves to an effectively massless scalar field with a potential V ∝F2, where F (σ )=Npl2…
Near-infrared Spectroscopy of Galaxies During Reionization: Measuring C III] in a Galaxy at z = 7.5
Papovich, Casey; Finkelstein, Steven L.; Dickinson, Mark +9 more
We present Keck/MOSFIRE H-band spectroscopy targeting C III] λ1907, 1909 in a z = 7.5056 galaxy previously identified via Lyα emission. We detect strong line emission at 1.621+/- 0.002 µ {{m}} with a line flux of (2.63 ± 0.52) × 10-18 erg s-1 cm-2. We tentatively identify this line as [C III] λ1907, but we ar…
Molecular and Ionized Gas Phases of an AGN-driven Outflow in a Typical Massive Galaxy at z ≈ 2
Lutz, D.; Wuyts, S.; Genzel, R. +22 more
Nuclear outflows driven by accreting massive black holes are one of the main feedback mechanisms invoked at high-z to reproduce the distinct separation between star-forming disk galaxies and quiescent spheroidal systems. Yet our knowledge of feedback at high-z remains limited by the lack of observations of the multiple gas phases in galaxy outflow…
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…