Search Publications
Timing Observations of PSR J1023+0038 During a Low-mass X-Ray Binary State
Deller, Adam T.; Bogdanov, Slavko; Hessels, Jason W. T. +5 more
Transitional millisecond pulsars (tMSPs) switch, on roughly multi-year timescales, between rotation-powered radio millisecond pulsar (RMSP) and accretion-powered low-mass X-ray binary (LMXB) states. The tMSPs have raised several questions related to the nature of accretion flow in their LMXB state and the mechanism that causes the state switch. Th…
Marginalizing Instrument Systematics in HST WFC3 Transit Light Curves
Wakeford, H. R.; Sing, D. K.; Deming, D. +2 more
Hubble Space Telescope (HST) Wide Field Camera 3 (WFC3) infrared observations at 1.1-1.7 µm probe primarily the H2O absorption band at 1.4 µm, and have provided low-resolution transmission spectra for a wide range of exoplanets. We present the application of marginalization based on Gibson to analyze exoplanet transit light …
Evolution of Intrinsic Scatter in the SFR-Stellar Mass Correlation at 0.5 < z < 3
Bell, Eric F.; Ferguson, Henry C.; Grogin, Norman A. +16 more
We present estimates of intrinsic scatter in the star formation rate (SFR)-stellar mass (M*) correlation in the redshift range 0.5< z< 3.0 and in the mass range {10}7< {M}*< {10}11M⊙. We utilize photometry in the Hubble Ultradeep Field (HUDF12) and Ultraviolet Ultra Deep Field (UVU…
The Properties of the Circumgalactic Medium in Red and Blue Galaxies: Results from the COS-GASS+COS-Halos Surveys
Heckman, Timothy; Saintonge, Amelie; Davé, Romeel +7 more
We use the combined data from the COS-GASS and COS-Halos surveys to characterize the Circum-Galactic Medium (CGM) surrounding typical low-redshift galaxies in the mass range {M}* ∼ {10}9.5-11.5 {M}⊙ , and over a range of impact parameters extending to just beyond the halo virial radius (R vir). We find t…
Proplyds Around a B1 Star: 42 Orionis in NGC 1977
Fang, Min; Facchini, Stefano; Clarke, Cathie J. +1 more
We present the discovery of seven new proplyds (I.e., sources surrounded by cometary Hα emission characteristic of offset ionization fronts (IFs)) in NGC 1977, located about 30‧ north of the Orion Nebula Cluster (ONC) at a distance of ∼400 pc. Each of these proplyds is situated at projected distances 0.04-0.27 pc from the B1V star 42 Orionis (c Or…
The Strikingly Uniform, Highly Turbulent Interstellar Medium of the Most Luminous Galaxy in the Universe
Stern, D.; Wu, J.; Aravena, M. +6 more
Observed at z = 4.601 and with Lbol = 3.5 × 1014 L⊙ , W2246-0526 is the most luminous galaxy known in the universe and hosts a deeply buried active galactic nucleus (AGN)/supermassive black hole (SMBH). Discovered using the Wide-field Infrared Survey Explorer, W2246-0526 is classified as a hot dust-obscured galaxy,…
Frontier Fields: Subaru Weak-Lensing Analysis of the Merging Galaxy Cluster A2744
Massey, Richard; Umetsu, Keiichi; Medezinski, Elinor +5 more
We present a weak-lensing analysis of the merging Frontier Fields (FF) cluster Abell 2744 using new Subaru/Suprime-Cam imaging. The wide-field lensing mass distribution reveals this cluster is comprised of four distinct substructures. Simultaneously modeling the two-dimensional reduced shear field using a combination of a Navarro-Frenk-White (NFW)…
Cloud Atlas: Discovery of Patchy Clouds and High-amplitude Rotational Modulations in a Young, Extremely Red L-type Brown Dwarf
Schneider, Glenn; Cowan, Nicolas B.; Burgasser, Adam J. +10 more
Condensate clouds fundamentally impact the atmospheric structure and spectra of exoplanets and brown dwarfs, but the connections between surface gravity, cloud structure, dust in the upper atmosphere, and the red colors of some brown dwarfs remain poorly understood. Rotational modulations enable the study of different clouds in the same atmosphere…
Chandra Observes the End of an Era in SN 1987A
Zhekov, Svetozar A.; Dwek, Eli; Park, Sangwook +3 more
Updated imaging and photometric results from Chandra observations of SN 1987A, covering the last 16 years, are presented. We find that the 0.5-2 keV light curve has remained constant at ∼8 × 10-12 erg s-1 cm-2 since 9500 days, with the 3-8 keV light curve continuing to increase until at least 10,000 days. The expan…
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…