First Spitzer Space Telescope Observations of Magnetic Cataclysmic Variables: Evidence of Excess Emission at 3-8 μm

@article{Howell2006FirstSS,
  title={First Spitzer Space Telescope Observations of Magnetic Cataclysmic Variables: Evidence of Excess Emission at 3-8 $\mu$m},
  author={Steve B. Howell and Carolyn Brinkworth and Donald Wayne Hoard and Stefanie Wachter and Thomas E. Harrison and Howard Chun and Beth Thomas and Linda Stefaniak and David R. Ciardi and Paula Szkody and Gerard T. van Belle},
  journal={The Astrophysical Journal Letters},
  year={2006},
  volume={646},
  pages={L65 - L68}
}
We present the first observations of magnetic cataclysmic variables using the Spitzer Space Telescope. We used the Infrared Array Camera to obtain photometry of the Polars EF Eri, GG Leo, V347 Pav, and RX J0154.0-5947 at 3.6, 4.5, 5.8, and 8.0 μm, respectively. In all of our targets, we detect excess mid-infrared emission over that expected from the component stars alone. We explore the origin of this IR excess by examining bremsstrahlung, cyclotron emission, circumbinary dust, and L/T brown… 

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References

SHOWING 1-10 OF 17 REFERENCES

Excess mid-infrared emission in cataclysmic variables

We present a search for excess mid-IR emission due to circumbinary material in the orbital plane of cataclysmic variables (CVs). Our motivation stems from the fact that the strong braking exerted by

First detections of the cataclysmic variable AE Aquarii in the near to far infrared with ISO and IRAS: Investigating the various possible thermal and non-thermal contributions

We have used ISO to observe the Magnetic Cataclysmic Variable AE Aquarii in the previously unexplored range from 4.8 µ mu p to 170µm in the framework of a coordinated multi-wavelength campaign from

Infrared Spectroscopy of Symbiotic Stars. IV. V2116 Ophiuchi/GX 1+4, The Neutron Star Symbiotic

We have computed, using 17 infrared radial velocities, the first set of orbital elements for the M giant in the symbiotic binary V2116 Ophiuchi. The giant's companion is a neutron star, the bright

Modeling the Remarkable Multiwavelength Light Curves of EF Eridanus: The Detection of Its Irradiated Brown Dwarf-like Secondary Star

We present optical and infrared phase-resolved photometry of the magnetic cataclysmic variable EF Eri during a low state. The BVRIJ light curves are very similar in appearance; all exhibit a dip of a

Keck Infrared Spectroscopy of WZ Sagittae: Detection of Molecular Emission from the Accretion Disk

Time-resolved IR spectroscopy of WZ Sge was obtained using NIRSPEC on Keck II. We detect CO and H2 emission from the accretion disk, placing WZ Sge in a rarefied class of astronomical objects

Magnetism in Isolated and Binary White Dwarfs

Since the discovery of the first isolated magnetic white dwarf (MWD) Grw +70°8047 nearly 60 years ago, the number of stars belonging to this class has grown steadily. There are now some 65 isolated

A Preliminary Observational Search for Circumbinary Disks around Cataclysmic Variables

Circumbinary (CB) disks have been proposed as a mechanism to extract orbital angular momentum from cataclysmic variables (CVs) during their evolution. As proposed by Taam & Spruit, these disks extend

Phase-Resolved Infrared H- and K-Band Spectroscopy of EF Eridani

We present new phase-resolved H- and K-band spectroscopy of the ultrashort-period magnetic cataclysmic variable EF Eri in its current prolonged "low" state obtained using NIRI on Gemini North and

The Evolution of Cataclysmic Variable Binary Systems with Circumbinary Disks

The effect of a circumbinary (CB) disk on the evolution of a binary consisting of a low-mass secondary star with a white dwarf primary is investigated, taking into account the viscous spreading of

Low Mass Companions to White Dwarfs

This paper summarizes the results of over 17 years of work searching for low mass stellar and substellar companions to more than 370 nearby white dwarfs. Roughly 60 low mass, unevolved companions