Search Publications
Detection of a westward hotspot offset in the atmosphere of hot gas giant CoRoT-2b
Deming, Drake; Fortney, Jonathan J.; Knutson, Heather A. +9 more
Short-period planets exhibit day-night temperature contrasts of hundreds to thousands of kelvin. They also exhibit eastward hotspot offsets whereby the hottest region on the planet is east of the substellar point1; this has been widely interpreted as advection of heat due to eastward winds2. We present thermal phase observati…
Dark matter hurricane: Measuring the S1 stream with dark matter detectors
Belokurov, Vasily; Evans, N. Wyn; Myeong, GyuChul +2 more
The recently discovered S1 stream passes through the Solar neighborhood on a low inclination, counterrotating orbit. The progenitor of S1 is a dwarf galaxy with a total mass comparable to the present-day Fornax dwarf spheroidal, so the stream is expected to have a significant DM component. We compute the effects of the S1 stream on WIMP and axion …
Pristine dwarf galaxy survey - I. A detailed photometric and spectroscopic study of the very metal-poor Draco II satellite
Geha, Marla; Navarro, Julio F.; Martin, Nicolas +17 more
We present a detailed study of the faint Milky Way satellite Draco II (Dra II) from deep CFHT/MegaCam broad-band g and i photometry and narrow-band metallicity-sensitive CaHK observations, along with follow-up Keck II/DEIMOS multi-object spectroscopy. Forward modelling of the deep photometry allows us to refine the structural and photometric prope…
September 2017's Geoeffective Space Weather and Impacts to Caribbean Radio Communications During Hurricane Response
Seaton, D. B.; Rodriguez, J. V.; He, J. +2 more
Between 4 and 10 September 2017, multiple solar eruptions occurred from active region AR12673. NOAA's and NASA's well-instrumented spacecraft observed the evolution of these geoeffective events from their solar origins, through the interplanetary medium, to their geospace impacts. The 6 September X9.3 flare was the largest to date for the nearly c…
Quasar Accretion Disk Sizes from Continuum Reverberation Mapping from the Dark Energy Survey
Benoit-Lévy, A.; Smith, M.; D'Andrea, C. B. +70 more
We present accretion disk size measurements for 15 luminous quasars at 0.7 ≤ z ≤ 1.9 derived from griz light curves from the Dark Energy Survey. We measure the disk sizes with continuum reverberation mapping using two methods, both of which are derived from the expectation that accretion disks have a radial temperature gradient and the continuum e…
Solar Energetic Particle Events Observed by the PAMELA Mission
de Nolfo, G. A.; Christian, E. R.; Ryan, J. M. +55 more
Despite the significant progress achieved in recent years, the physical mechanisms underlying the origin of solar energetic particles (SEPs) are still a matter of debate. The complex nature of both particle acceleration and transport poses challenges to developing a universal picture of SEP events that encompasses both the low-energy (from tens of…
On the 1/f Spectrum in the Solar Wind and Its Connection with Magnetic Compressibility
Matteini, L.; Horbury, T. S.; Chen, C. H. K. +1 more
We discuss properties of Alfvénic fluctuations with large amplitude in plasmas characterized by low magnetic field compression. We note that in such systems power laws cannot develop with arbitrarily steep slopes at large scales, i.e., when | δ {\boldsymbol{B}}| becomes of the order of the background field | {\boldsymbol{B}}| . In such systems the…
Quantifying the AGN-driven outflows in ULIRGs (QUADROS) - I: VLT/Xshooter observations of nine nearby objects
Tadhunter, Clive; Santoro, Francesco; Rodríguez Zaurín, Javier +3 more
Although now routinely incorporated into hydrodynamic simulations of galaxy evolution, the true importance of the feedback effect of the outflows driven by active galactic nuclei (AGN) remains uncertain from an observational perspective. This is due to a lack of accurate information on the densities, radial scales and level of dust extinction of t…
Supernovae 2016bdu and 2005gl, and their link with SN 2009ip-like transients: another piece of the puzzle
Drake, A. J.; Lundqvist, P.; Djorgovski, S. G. +52 more
Supernova (SN) 2016bdu is an unusual transient resembling SN 2009ip. SN 2009ip-like events are characterized by a long-lasting phase of erratic variability which ends with two luminous outbursts a few weeks apart. The second outburst is significantly more luminous (about 3 mag) than the first. In the case of SN 2016bdu, the first outburst (Event A…
Fast molecular outflow from a dusty star-forming galaxy in the early Universe
Béthermin, M.; Stark, A. A.; Vieira, J. D. +20 more
Galaxies grow inefficiently, with only a small percentage of the available gas converted into stars each free-fall time. Feedback processes, such as outflowing winds driven by radiation pressure, supernovae, or supermassive black hole accretion, can act to halt star formation if they heat or expel the gas supply. We report a molecular outflow laun…