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Close Companions to Young Stars. I. A Large Spectroscopic Survey in Chamaeleon I and Taurus-Auriga
Duy Cuong Nguyen, Alexis Brandeker, Ray Jayawardhana +1
We present the results of a multiplicity survey of 212 T Tauri stars in the Chamaeleon I and Taurus-Auriga star-forming regions, based on high-resolution spectra from the Magellan…
The X-ray Counterpart of the High-B Pulsar PSR J0726-2612
J. S. Speagle, D. L. Kaplan, M. H. van Kerkwijk
Middle-aged, cooling neutron stars are observed both as relatively rapidly spinning radio pulsars and as more slowly spinning, strongly magnetized isolated neutron stars (INSs), wh…
The spectrum of the recycled PSR J0437-4715 and its white dwarf companion
M. Durant, O. Kargaltsev, G. G. Pavlov +4
We present extensive spectral and photometric observations of the recycled pulsar/white-dwarf binary containing PSR J0437-4715, which we analyzed together with archival X-ray and g…
KOI 1224, a Fourth Bloated Hot White Dwarf Companion Found With Kepler
Rene P. Breton, Saul A. Rappaport, Marten H. van Kerkwijk +1
We present an analysis and interpretation of the Kepler binary system KOI 1224. This is the fourth binary found with Kepler that consists of a thermally bloated, hot white dwarf in…
Ultra-soft sources as supernova type Ia progenitors
Kelly Lepo, Marten van Kerkwijk
Missing from the usual considerations of nuclear burning white dwarfs as Type Ia supernova progenitors are systems with very higher mass transfer rates, where more material than is…
Properties of Carbon-Oxygen White Dwarf Merger Remnants
Chenchong Zhu, Philip Chang, Marten van Kerkwijk +1
Recent studies have shown that for suitable initial conditions both super- and sub-Chandrasekhar mass carbon-oxygen white dwarf mergers produce explosions similar to observed SNe I…
A Coherent Timing Solution for the Nearby, Thermally Emitting Isolated Neutron Star RX J0420.0-5022
David L. Kaplan, Marten H. van Kerkwijk
We present a phase-coherent timing solution for RX J0420.0-5022, the coolest (kT=45 eV) and fastest-spinning (P=3.45 s) of the seven so-called isolated neutron stars (INSs). Using…
New Optical/UV Counterparts and the Spectral Energy Distributions of Nearby, Thermally Emitting, Isolated Neutron Stars
David L. Kaplan, Atish Kamble, Marten H. van Kerkwijk +1
We present Hubble Space Telescope optical and ultraviolet photometry for five nearby, thermally emitting neutron stars. With these measurements, all seven such objects have confirm…