University of California, Santa Cruz

output

19912026

researchers with a paper here

Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.

collaborating institutions

Showing 2017 · astro-ph.SRShow all

27 papers · 2 filters

astro-ph.SR2017★ 42 cited

A Recurrent Nova Super-Remnant in the Andromeda Galaxy

M. J. Darnley, R. Hounsell, T. J. O'Brien +11

Here we report that the most rapidly recurring nova, M31N 2008-12a, which erupts annually, is surrounded by a "nova super-remnant" which demonstrates that M31N 2008-12a has erupted…

astro-ph.SR2017★ 11 cited

First NuSTAR Limits on Quiet Sun Hard X-Ray Transient Events

Andrew J. Marsh, David M. Smith, Lindsay Glesener +16

We present the first results of a search for transient hard X-ray (HXR) emission in the quiet solar corona with the \textit{Nuclear Spectroscopic Telescope Array} (\textit{NuSTAR})…

astro-ph.SR2017★ 36 cited

Cloud Atlas: Discovery of Rotational Spectral Modulations in a Low-mass, L-type Brown Dwarf Companion to a Star

Elena Manjavacas, Daniel Apai, Yifan Zhou +11

Observations of rotational modulations of brown dwarfs and giant exoplanets allow the characterization of condensate cloud properties. As of now rotational spectral modulations hav…

astro-ph.SR2017★ 61 cited

Emission line models for the lowest-mass core collapse supernovae. I: Case study of a 9 $M_{⊙}$ one-dimensional neutrino-driven explosion

A. Jerkstrand, T. Ertl, H. -T. Janka +3

A large fraction of core-collapse supernovae (CCSNe), 30-50%, are expected to originate from the low-mass end of progenitors with $M_{ZAMS} = 8 - 12 M_{⊙}$ . However, degeneracy…

astro-ph.SR2017★ 19 cited

No Neon, but Jets in the Remarkable Recurrent Nova M31N 2008-12a? - Hubble Space Telescope Spectroscopy of the 2015 Eruption

M. J. Darnley, R. Hounsell, P. Godon +14

The 2008 discovery of an eruption of M31N 2008-12a began a journey on which the true nature of this remarkable recurrent nova continues to be revealed. M31N 2008-12a contains a whi…

astro-ph.SR2017★ 19 cited

Fast and Luminous Transients from the Explosions of Long Lived Massive White Dwarf Merger Remnants

Jared Brooks, Josiah Schwab, Lars Bildsten +4

We study the evolution and final outcome of long-lived ( $\approx 1 0^{5}$ years) remnants from the merger of a He white dwarf (WD) with a more massive C/O or O/Ne WD. Using Modules f…

astro-ph.SR2017★ 2.1k cited

Modules for Experiments in Stellar Astrophysics (MESA): Convective Boundaries, Element Diffusion, and Massive Star Explosions

Bill Paxton, Josiah Schwab, Evan B. Bauer +10

We update the capabilities of the software instrument Modules for Experiments in Stellar Astrophysics (MESA) and enhance its ease of use and availability. Our new approach to locat…

astro-ph.SR2017★ 44 cited

A Search for a Surviving White Dwarf Companion in SN 1006

W. E. Kerzendorf, G. Strampelli, K. J. Shen +5

Multiple channels have been proposed to produce Type Ia supernovae, with many scenarios suggesting that the exploding white dwarf accretes from a binary companion pre-explosion. In…

astro-ph.SR2017★ 48 cited

A Catalog of Stellar Unified Properties (CATSUP) for 951 FGK-Stars Within 30 pc

Natalie R. Hinkel, Eric E. Mamajek, Margaret C. Turnbull +6

Almost every star in our Galaxy is likely to harbor a terrestrial planet, but accurate measurements of an exoplanet's mass and radius demands accurate knowledge of the properties o…

astro-ph.SR2017★ 46 cited

The Importance of Urca-process Cooling in Accreting ONe White Dwarfs

Josiah Schwab, Lars Bildsten, Eliot Quataert

We study the evolution of accreting oxygen-neon (ONe) white dwarfs (WDs), with a particular emphasis on the effects of the presence of the carbon-burning products $\mathrm{^{23}Na}…

astro-ph.SR2017★ 37 cited

NuSTAR hard X-ray observation of a sub-A class solar flare

Lindsay Glesener, Sa"m Krucker, Iain G. Hannah +5

We report a NuSTAR observation of a solar microflare, SOL2015-09-01T04. Although it was too faint to be observed by the GOES X-ray Sensor, we estimate the event to be an A0.1 class…

astro-ph.SR2017★ 26 cited

Electron Captures on $^{14} N$ as a Trigger for Helium Shell Detonations

Evan B. Bauer, Josiah Schwab, Lars Bildsten

White dwarfs (WDs) that accrete helium at rates $\sim 1 0^{- 8} M_{⊙} y r^{- 1}$ , such as those in close binaries with sdB stars, can accumulate large ($\gtrsim 0.1 \, M_\o…

astro-ph.SR2017★ 75 cited

Microflare Heating of a Solar Active Region Observed with NuSTAR, Hinode/XRT, and SDO/AIA

Paul J. Wright, Iain G. Hannah, Brian W. Grefenstette +7

NuSTAR is a highly sensitive focusing hard X-ray (HXR) telescope and has observed several small microflares in its initial solar pointings. In this paper, we present the first join…

astro-ph.SR2017★ 80 cited

Two transitional type~Ia supernovae located in the Fornax cluster member NGC 1404: SN 2007on and SN 2011iv

C. Gall, M. D. Stritzinger, C. Ashall +26

We present an analysis of ultraviolet (UV) to near-infrared observations of the fast-declining Type Ia supernovae (SNe Ia) 2007on and 2011iv, hosted by the Fornax cluster member NG…

astro-ph.SR2017★ 10 cited

Improved Constraints on the Disk Around MWC 349A from the 23-Meter LBTI

Steph Sallum, Josh Eisner, Phil Hinz +4

We present new spatially resolved observations of MWC 349A from the Large Binocular Telescope Interferometer (LBTI), a 23-meter baseline interferometer made up of two, co-mounted 8…

astro-ph.SR2017★ 59 cited

Very Deep Inside the SN 1987A Core Ejecta: Molecular Structures Seen in 3D

F. J. Abellán, R. Indebetouw, J. M. Marcaide +21

Most massive stars end their lives in core-collapse supernova explosions and enrich the interstellar medium with explosively nucleosynthesized elements. Following core collapse, th…

astro-ph.SR2017★ 41 cited

Accretion-Induced Collapse From Helium Star + White Dwarf Binaries

Jared Brooks, Josiah Schwab, Lars Bildsten +2

Accretion-induced collapse (AIC) occurs when an O/Ne white dwarf (WD) grows to nearly the Chandrasekhar mass ( $M_{Ch}$ ), reaching central densities that trigger electron captur…

astro-ph.SR2017★ 73 cited

Connecting the progenitors, pre-explosion variability, and giant outbursts of luminous blue variables with Gaia16cfr

Charles D. Kilpatrick, Ryan J. Foley, Maria R. Drout +10

We present multi-epoch, multi-colour pre-outburst photometry and post-outburst light curves and spectra of the luminous blue variable (LBV) outburst Gaia16cfr discovered by the Gai…

astro-ph.SR2017★ 104 cited

The Extended IRTF Spectral Library: Expanded coverage in metallicity, temperature, and surface gravity

Alexa Villaume, Charlie Conroy, Benjamin Johnson +3

We present a $0.7 - 2.5 μ m$ spectral library of 284 stars observed with the medium-resolution infrared spectrograph, SpeX, at the 3.0 meter NASA Infrared Telescope Facility (IRTF) on…

astro-ph.SR2017★ 64 cited

Accretion Disk Assembly During Common Envelope Evolution: Implications for Feedback and LIGO Binary Black Hole Formation

Ariadna Murguia-Berthier, Morgan MacLeod, Enrico Ramirez-Ruiz +2

During a common envelope episode in a binary system, the engulfed companion spirals to tighter orbital separations under the influence of drag from the surrounding envelope materia…

astro-ph.SR2017★ 32 cited

HAZMAT II: Ultraviolet Variability of Low-Mass Stars in the GALEX Archive

Brittany E. Miles, Evgenya L. Shkolnik

The ultraviolet (UV) light from a host star influences a planet's atmospheric photochemistry and will affect interpretations of exoplanetary spectra from future missions like the J…

astro-ph.SR2017★ 113 cited

Common Envelope Wind Tunnel: Coefficients of Drag and Accretion in a Simplified Context for Studying Flows Around Objects Embedded Within Stellar Envelopes

Morgan MacLeod, Andrea Antoni, Ariadna Murgia-Berthier +2

This paper examines the properties of flows around objects embedded within common envelopes in the simplified context of a "wind tunnel." We establish characteristic relationships…