Search Publications
Giant Planet Occurrence within 0.2 au of Low-luminosity Red Giant Branch Stars with K2
Huber, Daniel; Gaidos, Eric; Stello, Dennis +3 more
Every Sun-like star will eventually evolve into a red giant, a transition which can profoundly affect the evolution of a surrounding planetary system. The timescale of dynamical planet evolution and orbital decay has important implications for planetary habitability, as well as post-main-sequence star and planet interaction, evolution, and interna…
ALMA and HST Kiloparsec-scale Imaging of a Quasar-galaxy Merger at Z ≈ 6.2
Carilli, Chris; Strauss, Michael A.; Fan, Xiaohui +12 more
We present kiloparsec-scale Atacama Large Millimeter/submillimeter Array (ALMA) and Hubble Space Telescope imaging of the quasar PJ308-21 at z = 6.2342, tracing dust, gas (via the [C II] 158 µm line), and young stars. At a resolution of ∼0.″3 (≈1.7 kpc), the system is resolved over >4″ (>20 kpc). In particular, it features a main compo…
SIGNALS: I. Survey description
Barmby, P.; Morisset, C.; Lyman, J. D. +61 more
SIGNALS, the Star formation, Ionized Gas, and Nebular Abundances Legacy Survey, is a large observing programme designed to investigate massive star formation and H II regions in a sample of local extended galaxies. The programme will use the imaging Fourier transform spectrograph SITELLE at the Canada-France-Hawaii Telescope. Over 355 h (54.7 nigh…
Turning Gravitationally Lensed Supernovae into Cosmological Probes
Rodney, S.; Pierel, J. D. R.
Recently, there have been two landmark discoveries of gravitationally lensed supernovae: the first multiply imaged SN, “Refsdal”, and the first Type Ia SN resolved into multiple images, SN iPTF16geu. Fitting the multiple light curves of such objects can deliver measurements of the lensing time delays, which are the difference in arrival times for …
The changing temperature of the nucleus of comet 67P induced by morphological and seasonal effects
Bellucci, G.; Kührt, E.; Mottola, S. +31 more
Knowledge of the surface temperature distribution on a comet's nucleus and its temporal evolution at different timescales is key to constraining its thermophysical properties and understanding the physical processes that take place at and below the surface. Here we report on time-resolved maps of comet 67P/Churyumov-Gerasimenko retrieved on the ba…
CO Emission in Infrared-selected Active Galactic Nuclei
Kirkpatrick, Allison; Pope, Alexandra; Keller, Erica +1 more
In order to better understand how active galactic nuclei (AGNs) affect the interstellar media of their host galaxies, we perform a meta-analysis of the CO emission for a sample of z = 0.01-4 galaxies from the literature with existing CO detections and well-constrained AGN contributions to the infrared (67 galaxies). Using either Spitzer/IRS mid-in…
The VANDELS survey: the role of ISM and galaxy physical properties in the escape of Lyα emission in z ∼ 3.5 star-forming galaxies
Maccagni, D.; Schaerer, D.; Finkelstein, S. L. +21 more
Aims: We wish to investigate the physical properties of a sample of Lyα emitting galaxies in the VANDELS survey, with particular focus on the role of kinematics and neutral hydrogen column density in the escape and spatial distribution of Lyα photons.
Methods: From all the Lyα emitting galaxies in the VANDELS Data Release 2 at 3.5 ≲ z ≲ …
The Large Sky Area Multi-object Fiber Spectroscopic Telescope (LAMOST) Quasar Survey: The Fourth and Fifth Data Releases
Feng, Xiaotong; Luo, A. -L.; Zhao, Y. -H. +15 more
We present Data Releases 4 and 5 of the quasar catalog from the quasar survey by the Large Sky Area Multi-object Fiber Spectroscopic Telescope (LAMOST), which includes quasars observed between 2015 September and 2017 June. There are a total of 19,253 quasars identified by visual inspections of the spectra. Among them, 11,458 were independently dis…
Spatially Resolved Stellar Kinematics of the Ultra-diffuse Galaxy Dragonfly 44. II. Constraints on Fuzzy Dark Matter
van Dokkum, Pieter; Forbes, Duncan A.; Romanowsky, Aaron J. +9 more
Given the absence of directly detected dark matter (DM) as weakly interacting massive particles, there is strong interest in the possibility that DM is an ultralight scalar field, here denoted as “fuzzy” DM. Ultra-diffuse galaxies, with the sizes of giant galaxies and the luminosities of dwarf galaxies, have a wide range of DM halo masses, thus pr…
The magnetic propeller accretion regime of LkCa 15
Moutou, C.; Ménard, F.; Carmona, A. +12 more
We present a spectropolarimetric study of the classical T Tauri star (cTTS) LkCa 15 investigating the large-scale magnetic topology of the central star and the way the field connects to the inner regions of the accretion disc. We find that the star hosts a strong poloidal field with a mainly axisymmetric dipole component of 1.35 kG, whereas the ma…