Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
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34 papers · 2 filters
Runaway Dwarf Carbon Stars as Candidate Supernova Ejecta
Kathryn A. Plant, Bruce Margon, Puragra Guhathakurta +3
The dwarf carbon (dC) star SDSS J112801.67+004034.6 has an unusually high radial velocity, 531 km s. We present proper motion and new spectroscopic observations which…
Uniform Atmospheric Retrieval Analysis of Ultracool Dwarfs II: Properties of 11 T-dwarfs
Michael R. Line, Mark S. Marley, Michael C. Liu +7
Brown dwarf spectra are rich in information revealing of the chemical and physical processes operating in their atmospheres. We apply a recently developed atmospheric retrieval too…
Discovery and Follow-up Observations of the Young Type Ia Supernova 2016coj
WeiKang Zheng, Alexei V. Filippenko, Jon Mauerhan +39
The Type~Ia supernova (SN~Ia) 2016coj in NGC 4125 (redshift ) was discovered by the Lick Observatory Supernova Search 4.9 days after the fitted first-light time (FFLT;…
Emission-line stars in M31 from the SPLASH and PHAT surveys
Laura J. Prichard, Puragra Guhathakurta, Katherine M. Hamren +7
We present a sample of 224 stars that emit H (H stars) in the Andromeda galaxy (M31). The stars were selected from 5000 spectra, collected as part of the Spectroscopic…
Convection Destroys the Core/Mantle Structure in Hybrid C/O/Ne White Dwarfs
Jared Brooks, Josiah Schwab, Lars Bildsten +2
A hybrid C/O/Ne white dwarf (WD) -- an unburned C/O core surrounded by an O/Ne/Na mantle -- can be formed if the carbon flame is quenched in a super-AGB (SAGB) star or white dwarf…
The evolution of superluminous supernova LSQ14mo and its interacting host galaxy system
T. -W. Chen, M. Nicholl, S. J. Smartt +26
We present and analyse an extensive dataset of the superluminous supernova (SLSN) LSQ14mo (z = 0.256), consisting of a multi-colour lightcurve from -30 d to +70 d in the rest-frame…
The Candidate Progenitor of the Type IIn SN 2010jl is Not an Optically Luminous Star
Ori D. Fox, Schuyler D. Van Dyk, Eli Dwek +8
The nature of the progenitor star (or system) for the Type IIn supernova (SN) subclass remains uncertain. While there are direct imaging constraints on the progenitors of at least…
On the Progenitor of the Type IIb Supernova 2016gkg
Charles D. Kilpatrick, Ryan J. Foley, Louis E. Abramson +7
We present a detection in pre-explosion Hubble Space Telescope (HST) imaging of a point source consistent with being the progenitor star of the Type IIb supernova (SN IIb) 2016gkg.…
Turbulent transport by diffusive stratified shear flows: from local to global models. Part I: Numerical simulations of a stratified plane Couette flow
P. Garaud, D. Gagnier, J. Verhoeven
Shear-induced turbulence could play a significant role in mixing momentum and chemical species in stellar radiation zones, as discussed by Zahn (1974). In this paper we analyze the…
The effect of rotation on oscillatory double-diffusive convection (semiconvection)
Ryan Moll, Pascale Garaud
Oscillatory double-diffusive convection (ODDC, more traditionally called semiconvection) is a form of linear double-diffusive instability that occurs in fluids that are unstably st…
After the Fall: Late-Time Spectroscopy of Type IIP Supernovae
Jeffrey M. Silverman, Stephanie Pickett, J. Craig Wheeler +11
Herein we analyse late-time (post-plateau; 103 < t < 1229 d) optical spectra of low-redshift (z < 0.016), hydrogen-rich Type IIP supernovae (SNe IIP). Our newly constructed sample…
Systematic non-LTE study of the [Fe/H] F and G dwarfs in the solar neighbourhood. II. Abundance patterns from Li to Eu
G. Zhao, L. Mashonkina, H. L. Yan +14
For the first time, we present an extensive study of stars with individual non-local thermodynamic equilibrium (NLTE) abundances for 17 chemical elements from Li to Eu in a sample…
A high mass progenitor for the Type Ic Supernova 2007gr inferred from its environment
Justyn Maund, Enrico Ramirez-Ruiz
We present an analysis of late-time Hubble Space Telescope Wide Field Camera 3 and Wide Field Planetary Camera 2 observations of the site of the Type Ic SN 2007gr in NGC 1058. The…
Stellar Flares in the CSTAR Field: Results from the 2008 Data Set
En-Si Liang, Songhu Wang, Ji-Lin Zhou +6
The Chinese Small Telescope ARray (CSTAR) is the first Chinese astronomical instrument placed in Antarctica. It is a group of four identical, fully automatic telesc…
L-band Spectroscopy with Magellan-AO/Clio2: First Results on Young Low-Mass Companions
Jordan M. Stone, Josh Eisner, Andy Skemer +6
L-band spectroscopy is a powerful probe of cool low-gravity atmospheres: The P, Q, and R branch fundamental transitions of methane near 3.3 m provide a sensitive probe of carbon…
Optical Identification of Cepheids in 19 Host Galaxies of Type Ia Supernovae and NGC 4258 with the Hubble Space Telescope
Samantha L. Hoffmann, Lucas M. Macri, Adam G. Riess +10
We present results of an optical search for Cepheid variable stars using the Hubble Space Telescope (HST) in 19 hosts of Type Ia supernovae (SNe Ia) and the maser-host galaxy NGC 4…
Observed Variability at 1um and 4um in the Y0 Brown Dwarf WISEP J173835.52+273258.9
S. K. Leggett, Michael C. Cushing, Kevin K. Hardegree-Ullman +10
We have monitored photometrically the Y0 brown dwarf WISEP J173835.52+273258.9 (W1738) at both near- and mid-infrared wavelengths. This ~1 Gyr-old 400K dwarf is at a distance of 8p…
Optical and ultraviolet spectroscopic analysis of SN 2011fe at late times
Brian Friesen, E. Baron, Jerod T. Parrent +16
We present optical spectra of the nearby Type Ia supernova SN 2011fe at 100, 205, 311, 349, and 578 days post-maximum light, as well as an ultraviolet spectrum obtained with Hubble…
An Unstable Truth: How Massive Stars get their Mass
Anna L. Rosen, Mark R. Krumholz, Christopher F. McKee +1
The pressure exerted by massive stars' radiation fields is an important mechanism regulating their formation. Detailed simulation of massive star formation therefore requires an ac…
The Chemical Composition of Red Giant Branch Stars in the Galactic Globular Clusters NGC 6342 and NGC 6366
Christian I. Johnson, Nelson Caldwell, R. Michael Rich +2
We present radial velocities and chemical abundances for red giant branch stars in the Galactic bulge globular clusters NGC 6342 and NGC 6366. The velocities and abundances are bas…
The First Focused Hard X-ray Images of the Sun with NuSTAR
Brian W. Grefenstette, Lindsay Glesener, Säm Krucker +20
We present results from the the first campaign of dedicated solar observations undertaken by the \textit{Nuclear Spectroscopic Telescope ARray} ({\em NuSTAR}) hard X-ray telescope.…
Time-Varying Sodium Absorption in the Type Ia Supernova 2013gh
R. Ferretti, R. Amanullah, A. Goobar +18
Temporal variability of narrow absorption lines in high-resolution spectra of Type Ia supernovae (SNe Ia) is studied to search for circumstellar matter. Time series which resolve t…
Lessons from the Onset of a Common Envelope Episode: the Remarkable M31 2015 Luminous Red Nova Outburst
Morgan MacLeod, Phillip Macias, Enrico Ramirez-Ruiz +3
This paper investigates the recent stellar merger transient M31LRN 2015 in the Andromeda galaxy. We analyze published optical photometry and spectroscopy along with a Hubble Space…
Evolution of Flare Ribbons, Electric Currents and Quasi-separatrix Layers During an X-class Flare
M. Janvier, A. Savcheva, E. Pariat +6
The standard model for eruptive flares has in the past few years been extended to 3D. It predicts typical J-shaped photospheric footprints of the coronal current layer, forming at…