Search Publications
Updated constraints and forecasts on primordial tensor modes
Melchiorri, Alessandro; Cabass, Giovanni; Gerbino, Martina +3 more
We present new, tight, constraints on the cosmological background of gravitational waves (GWs) using the latest measurements of CMB temperature and polarization anisotropies provided by the Planck, BICEP2 and Keck Array experiments. These constraints are further improved when the GW contribution NeffGW to the effective number…
A free-form prediction for the reappearance of supernova Refsdal in the Hubble Frontier Fields cluster MACSJ1149.5+2223
Broadhurst, Tom; Zheng, Wei; Zitrin, Adi +7 more
The massive cluster MACSJ1149.5+2223(z = 0.544) displays five very large lensed images of a well-resolved spiral galaxy at zspect = 1.491. It is within one of these images that the first example of a multiply lensed supernova (SN) has been detected recently as part of the Grism Lens-Amplified Survey from Space. The depth of this data al…
A package for the automated classification of periodic variable stars
Bailer-Jones, Coryn A. L.; Kim, Dae-Won
We present a machine learning package for the classification of periodic variable stars. Our package is intended to be general: it can classify any single band optical light curve comprising at least a few tens of observations covering durations from weeks to years with arbitrary time sampling. We use light curves of periodic variable stars taken …
The plasma structure of coronal hole solar wind: Origins and evolution
Borovsky, Joseph E.
Whereas slow solar wind is known to be highly structured, the fast (coronal hole origin) wind is usually considered to be homogeneous. Using measurements from Helios 1 + 2, ACE, Wind, and Ulysses, structure in the coronal hole origin solar wind is examined from 0.3 AU to 2.3 AU. Care is taken to collect and analyze intervals of "unperturbed corona…
Fission and reconfiguration of bilobate comets as revealed by 67P/Churyumov-Gerasimenko
Mottola, Stefano; Steckloff, Jordan; Naidu, Shantanu P. +6 more
The solid, central part of a comet—its nucleus—is subject to destructive processes, which cause nuclei to split at a rate of about 0.01 per year per comet. These destructive events are due to a range of possible thermophysical effects; however, the geophysical expressions of these effects are unknown. Separately, over two-thirds of comet nuclei th…
Tracing outflows in the AGN forbidden region with SINFONI
Piconcelli, E.; Brusa, M.; Mainieri, V. +8 more
Context. Active galactic nucleus (AGN) driven outflows are invoked in numerical simulations to reproduce several observed properties of local galaxies. The z > 1 epoch is of particular interest as it was during this time that the volume averaged star formation and the accretion rate of black holes were at their maximum. Radiatively driven outfl…
HST Hot-Jupiter Transmission Spectral Survey: Clear Skies for Cool Saturn WASP-39b
Deming, Drake; Nikolov, Nikolay; Fortney, Jonathan J. +13 more
We present the Hubble Space Telescope (HST) Space Telescope Imaging Spectrograph (STIS) optical transmission spectroscopy of the cool Saturn-mass exoplanet WASP-39b from 0.29-1.025 µm, along with complementary transit observations from Spitzer IRAC at 3.6 and 4.5 µm. The low density and large atmospheric pressure scale height of WASP-3…
The Major Geoeffective Solar Eruptions of 2012 March 7: Comprehensive Sun-to-Earth Analysis
Gontikakis, C.; Patsourakos, S.; Tsinganos, K. +33 more
During the interval 2012 March 7-11 the geospace experienced a barrage of intense space weather phenomena including the second largest geomagnetic storm of solar cycle 24 so far. Significant ultra-low-frequency wave enhancements and relativistic-electron dropouts in the radiation belts, as well as strong energetic-electron injection events in the …
The Evolution of the Intracluster Medium Metallicity in Sunyaev Zel’dovich-selected Galaxy Clusters at 0 < z < 1.5
Hlavacek-Larrondo, J.; Bleem, L. E.; Stalder, B. +16 more
We present the results of an X-ray spectral analysis of 153 galaxy clusters observed with the Chandra, XMM-Newton, and Suzaku space telescopes. These clusters, which span 0 < z < 1.5, were drawn from a larger, mass-selected sample of galaxy clusters discovered in the 2500 square degree South Pole Telescope Sunyaev Zel’dovich (SPT-SZ) survey.…
The Relationship Between Molecular Gas, H I, and Star Formation in the Low-mass, Low-metallicity Magellanic Clouds
Bot, Caroline; Bolatto, Alberto D.; Leroy, Adam K. +14 more
The Magellanic Clouds provide the only laboratory to study the effects of metallicity and galaxy mass on molecular gas and star formation at high (∼⃒20 pc) resolution. We use the dust emission from HERITAGE Herschel data to map the molecular gas in the Magellanic Clouds, avoiding the known biases of CO emission as a tracer of {{{H}}}2. U…