HST/COS DETECTION OF THE SPECTRUM OF THE SUBDWARF COMPANION OF KOI-81

@article{Matson2015HSTCOSDO,
  title={HST/COS DETECTION OF THE SPECTRUM OF THE SUBDWARF COMPANION OF KOI-81},
  author={Rachel A. Matson and Douglas R. Gies and Zhao Guo and Samuel N. Quinn and Lars A. Buchhave and David W. Latham and Steve B. Howell and Jason F. Rowe},
  journal={The Astrophysical Journal},
  year={2015},
  volume={806}
}
KOI-81 is a totally eclipsing binary discovered by the Kepler mission that consists of a rapidly rotating B-type star and a small, hot companion. The system was forged through large-scale mass transfer that stripped the mass donor of its envelope and spun up the mass gainer star. We present an analysis of UV spectra of KOI-81 that were obtained with the Cosmic Origins Spectrograph on the Hubble Space Telescope that reveal for the first time the spectral features of the faint, hot companion. We… 

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References

SHOWING 1-10 OF 51 REFERENCES

Hubble Space Telescope Goddard High Resolution Spectrograph Observations of the Be + sdO Binary ϕ Persei

Mass transfer during the evolution of intermediate-mass stars in a close binary system can result in a rejuvenated and spun-up secondary star (which may appear as a rapidly rotating Be star) orbiting

KOI 1224: A FOURTH BLOATED HOT WHITE DWARF COMPANION FOUND WITH KEPLER

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 a close orbit with

KEPLER OBSERVATIONS OF TRANSITING HOT COMPACT OBJECTS

Kepler photometry has revealed two unusual transiting companions: one orbiting an early A-star and the other orbiting a late B-star. In both cases, the occultation of the companion is deeper than the

OBSERVATIONS OF DOPPLER BOOSTING IN KEPLER LIGHT CURVES

Among the initial results from Kepler were two striking light curves, for KOI 74 and KOI 81, in which the relative depths of the primary and secondary eclipses showed that the more compact, less

A THIRD HOT WHITE DWARF COMPANION DETECTED BY KEPLER

We have found a system listed in the Kepler Binary Catalog (Porb = 3.273 days) that we have determined is comprised of a low-mass, thermally bloated, hot white dwarf orbiting an A star of about 2.3

Hot subdwarf binaries from the MUCHFUSS project Analysis of 12 new systems and a study of the short-period binary population

The project Massive Unseen Companions to Hot Faint Underluminous Stars from SDSS (MUCHFUSS) aims at finding hot subdwarf stars with massive compact companions like massive white dwarfs (M > 1.0 M⊙),

Orbital properties of an unusually low-mass sdB star in a close binary system with a white dwarf

We have used 605 days of photometric data from the Kepler spacecraft to study KIC 6614501, a close binary system with an orbital period of 0.157 497 47(25) days (3.779 939 h), that consists of a

Discovery of a helium-core white dwarf progenitor

We discovered that HD 188112, a bright (V= 10 m: 2), nearby (80 pc) B-type star, is a unique subluminous B (sdB) star. SdB stars are usually identified with models of core helium burning Extreme

THE COSMIC ORIGINS SPECTROGRAPH

The Cosmic Origins Spectrograph (COS) is a moderate-resolution spectrograph with unprecedented sensitivity that was installed into the Hubble Space Telescope (HST) in 2009 May, during HST Servicing

Transits and Lensing by Compact Objects in the Kepler Field: Disrupted Stars Orbiting Blue Stragglers

Kepler’s first major discoveries are two hot ( T> 10,000 K) small-radius objects orbiting stars in its field. A viable hypothesis is that these are the cores of stars that have each been eroded or
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