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Optical follow-up of gravitational wave triggers with DECam during the first two LIGO/VIRGO observing runs
Berger, E.; Bechtol, K.; Smith, M. +82 more
Gravitational wave (GW) events detectable by LIGO and Virgo have several possible progenitors, including black hole mergers, neutron star mergers, black hole-neutron star mergers, supernovae, and cosmic string cusps. A subset of GW events is expected to produce electromagnetic (EM) emission that, once detected, will provide complementary informati…
The Bathymetry of Moray Sinus at Titan's Kraken Mare
Lunine, J. I.; Hayes, A. G.; Le Gall, A. +4 more
Moray Sinus is an estuary located at the northern end of Titan's Kraken Mare. The Cassini RADAR altimeter acquired three segments over this mare during the T104 flyby of Titan, on August 21, 2014. Herein, we present a detailed analysis of the received echoes. Some of these waveforms exhibit a reflection from the seafloor, from up to 85-18+28 m of …
Scaling K2. III. Comparable Planet Occurrence in the FGK Samples of Campaign 5 and Kepler
Schlieder, Joshua E.; Petigura, Erik A.; Crossfield, Ian J. M. +5 more
Using our K2 Campaign 5 fully automated planet-detection data set (43 planets), which has corresponding measures of completeness and reliability, we infer an underlying planet population model for the FGK dwarf sample (9257 stars). Implementing a broken power law for both the period and radius distributions, we find an overall planet occurrence of…
Resolving Decades of Periodic Spirals from the Wolf-Rayet Dust Factory WR 112
Moffat, Anthony F. J.; Stevens, Ian R.; Sakon, Itsuki +9 more
WR 112 is a dust-forming carbon-rich Wolf-Rayet (WC) binary with a dusty circumstellar nebula that exhibits a complex asymmetric morphology, which traces the orbital motion and dust formation in the colliding winds of the central binary. Unraveling the complicated circumstellar dust emission around WR 112 therefore provides an opportunity to under…
A thirty-four billion solar mass black hole in SMSS J2157-3602, the most luminous known quasar
Fan, Xiaohui; Wolf, Christian; Bian, Fuyan +3 more
From near-infrared spectroscopic measurements of the Mg II emission line doublet, we estimate the black hole (BH) mass of the quasar, SMSS J215728.21-360215.1, as being (3.4 ± 0.6) × 1010 M⊙ and refine the redshift of the quasar to be z = 4.692. SMSS J2157 is the most luminous known quasar, with a 3000 Å luminosity of (4.7 ± …
Polyphase Mid-Latitude Glaciation on Mars: Chronology of the Formation of Superposed Glacier-Like Forms from Crater-Count Dating
Hepburn, A. J.; Hubbard, B.; Ng, F. S. L. +2 more
Reconstructing Mars's glacial history informs understanding of its physical environment and past climate. The known distribution of viscous flow features (VFFs) containing water ice suggests that its mid-latitudes were glaciated during the Late Amazonian period (the last several hundred million years). The identification of a subgroup of VFFs—call…
Exploring Effects on Magnifications due to Line-of-Sight Galaxies in the Hubble Frontier Fields
Keeton, Charles R.; Raney, Catie A.; Brennan, Sean
Cluster lensing has become an important tool in the search for high redshift galaxies through its ability to magnify sources. In order to determine the intrinsic properties of these galaxies, lensing mass models must be constructed to determine the magnification of the images. These models are traditionally two-dimensional, focusing on the mass wi…
Surface Brightness Evolution of Galaxies in the CANDELS GOODS Fields up to z ∼ 6: High-z Galaxies Are Unique or Remain Undetected
Conselice, C. J.; Duncan, K.; Spitler, L. R. +1 more
We investigate the rest-frame ultraviolet (UV, λ ∼ 2000 Å) surface brightness (SB) evolution of galaxies up to z ∼ 6 using a variety of deep Hubble Space Telescope (HST) imaging. UV SB is a measure of the density of emission from mostly young stars and correlates with an unknown combination of star formation rate, initial mass function, cold gas m…
Constraining planet formation around 6-8 M⊙ stars
Hermes, J. J.; Gänsicke, Boris T.; Kennedy, Grant M. +4 more
Identifying planets around O-type and B-type stars is inherently difficult; the most massive known planet host has a mass of only about $3\, \mathrm{M}_{\odot }$ . However, planetary systems which survive the transformation of their host stars into white dwarfs can be detected via photospheric trace metals, circumstellar dusty and gaseous discs, a…
First detection of two superoutbursts during the rebrightening phase of a WZ Sge-type dwarf nova: TCP J21040470+4631129
Ruiz, Javier; Nogami, Daisaku; Tamura, Motohide +51 more
We report on photometric and spectroscopic observations and analysis of the 2019 superoutburst of TCP J21040470+4631129. This object showed a 9 mag superoutburst with early superhumps and ordinary superhumps, which are the features of WZ Sge-type dwarf novae. Five rebrightenings were observed after the main superoutburst. The spectra during the po…