Search Publications
Predicting the Presence of Companions for Stripped-envelope Supernovae: The Case of the Broad-lined Type Ic SN 2002ap
Fox, O. D.; Smith, N.; Filippenko, A. V. +10 more
Many young, massive stars are found in close binaries. Using population synthesis simulations we predict the likelihood of a companion star being present when these massive stars end their lives as core-collapse supernovae (SNe). We focus on stripped-envelope SNe, whose progenitors have lost their outer hydrogen and possibly helium layers before e…
Whimper of a Bang: Documenting the Final Days of the Nearby Type Ia Supernova 2011fe
Garnavich, P. M.; Kochanek, C. S.; Stanek, K. Z. +1 more
Using the Hubble Space Telescope (HST) and the Large Binocular Telescope, we followed the evolution of the Type Ia supernova (SN Ia) 2011fe for an unprecedented 1840 days past B-band maximum light and over a factor of 7 million in flux. At 1840 days, the 4000-17000 Å quasi-bolometric luminosity is just (420+/- 20) {L}⊙ . By measuring th…
A Comparison of Cosmological Parameters Determined from CMB Temperature Power Spectra from the South Pole Telescope and the Planck Satellite
Bleem, L. E.; Stark, A. A.; George, E. M. +42 more
The Planck cosmic microwave background temperature data are best fit with a ΛCDM model that mildly contradicts constraints from other cosmological probes. The South Pole Telescope (SPT) 2540 {\deg }2 SPT-SZ survey offers measurements on sub-degree angular scales (multipoles 650≤slant {\ell }≤slant 2500) with sufficient precision to use …
On the Stellar Masses of Giant Clumps in Distant Star-forming Galaxies
Schaerer, Daniel; Cava, Antonio; Mayer, Lucio +2 more
We analyze stellar masses of clumps drawn from a compilation of star-forming galaxies at 1.1 < z < 3.6. Comparing clumps selected in different ways, and in lensed or blank field galaxies, we examine the effects of spatial resolution and sensitivity on the inferred stellar masses. Large differences are found, with median stellar masses rangin…
The Grism Lens-Amplified Survey from Space (GLASS). XI. Detection of C IV in Multiple Images of the z = 6.11 Lyα Emitter behind RXC J2248.7-4431
Vulcani, B.; Hoag, A.; Bradač, M. +11 more
The C III] and C IV rest-frame UV emission lines are powerful probes of the ionization states of galaxies. They have furthermore been suggested as alternatives for spectroscopic redshift confirmation of objects at the epoch of reionization (z> 6), where the most frequently used redshift indicator, Lyα, is attenuated by the high fraction of neut…
Calibration of Ultraviolet, Mid-infrared, and Radio Star Formation Rate Indicators
Imanishi, Masatoshi; Peek, J. E. G.; Kennicutt, Robert C. +12 more
We present calibrations for star formation rate (SFR) indicators in the ultraviolet, mid-infrared, and radio-continuum bands, including one of the first direct calibrations of 150 MHz as an SFR indicator. Our calibrations utilize 66 nearby star-forming galaxies with Balmer-decrement-corrected {{H}}α luminosities, which span five orders of magnitud…
Polycyclic Aromatic Hydrocarbons in Protoplanetary Disks around Herbig Ae/Be and T Tauri Stars
Seok, Ji Yeon; Li, Aigen
A distinct set of broad emission features at 3.3, 6.2, 7.7, 8.6, 11.3, and 12.7 µm, is often detected in protoplanetary disks (PPDs). These features are commonly attributed to polycyclic aromatic hydrocarbons (PAHs). We model these emission features in the infrared spectra of 69 PPDs around 14 T Tauri and 55 Herbig Ae/Be stars in terms of as…
X-Ray Counterpart of Gravitational Waves Due to Binary Neutron Star Mergers: Light Curves, Luminosity Function, and Event Rate Density
Sun, Hui; Zhang, Bing; Gao, He
Zhang proposed a type of GRB-less X-ray transient associated with double neutron star (NS-NS) mergers under the conjecture of a rapidly spinning magnetar merger product with the line of sight off the short gamma-ray burst (GRB) jet. We investigate possible light curves of these transients by considering different observers’ viewing angles. We perf…
Forecasting the Impact of Stellar Activity on Transiting Exoplanet Spectra
Line, Michael R.; Zellem, Robert T.; Ciardi, David R. +8 more
Exoplanet host star activity, in the form of unocculted starspots or faculae, alters the observed transmission and emission spectra of the exoplanet. This effect can be exacerbated when combining data from different epochs if the stellar photosphere varies between observations due to activity. Here, we present a method to characterize and correct …
Variable Dynamics in the Inner Disk of HD 135344B Revealed with Multi-epoch Scattered Light Imaging
Kraus, Stefan; Milli, Julien; Benisty, Myriam +12 more
We present multi-epoch Very Large Telescope/Spectro-Polarimetric High-contrast Exoplanet REsearch (VLT/SPHERE) observations of the protoplanetary disk around HD 135344B (SAO 206462). The J-band scattered light imagery reveal, with high spatial resolution (∼41 mas, 6.4 au), the disk surface beyond ∼20 au. Temporal variations are identified in the a…