Nova-like cataclysmic variables in the infrared

Hoard, D. W. and Long, Knox S. and Howell, Steve B. and Wachter, Stefanie and Brinkworth, Carolyn S. and Knigge, Christian and Drew, J. E. and Szkody, Paula and Kafka, S. and Belle, Kunegunda and Ciardi, David R. and Froning, Cynthia S. and van Belle, Gerard T. and Pretorius, M. L. (2014) Nova-like cataclysmic variables in the infrared. The Astrophysical Journal, 786 (1). pp. 68-91. ISSN 0004-637X

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Abstract

Nova-like (NL) cataclysmic variables have persistently high mass transfer rates and prominent steady state accretion disks. We present an analysis of infrared observations of 12 NLs obtained from the Two Micron All Sky Survey, the Spitzer Space Telescope, and the Wide-field Infrared Survey Explorer All Sky Survey. The presence of an infrared excess at λ ≳ 3-5 μm over the expectation of a theoretical steady state accretion disk is ubiquitous in our sample. The strength of the infrared excess is not correlated with orbital period, but shows a statistically significant correlation (but shallow trend) with system inclination that might be partially (but not completely) linked to the increasing view of the cooler outer accretion disk and disk rim at higher inclinations. We discuss the possible origin of the infrared excess in terms of emission from bremsstrahlung or circumbinary dust, with either mechanism facilitated by the mass outflows (e.g., disk wind/corona, accretion stream overflow, and so on) present in NLs. Our comparison of the relative advantages and disadvantages of either mechanism for explaining the observations suggests that the situation is rather ambiguous, largely circumstantial, and in need of stricter observational constraints.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Access to published version in accordance with the copyright policy of the publisher.
Faculty / Department / School: No Faculty
Date Deposited: 31 May 2017 01:26
Last Modified: 27 Jun 2017 04:37
Uncontrolled Keywords: accretion disks; circumstellar matter; infrared: stars; novae cataclysmic variables; stars: individual (TT Ari WX Ari QU Car V592 Cas V442 Oph V347 Pup V3885 Sgr VY Scl RW Sex RW Tri UX UMa IX Vel;
Fields of Research : 02 Physical Sciences > 0201 Astronomical and Space Sciences > 020110 Stellar Astronomy and Planetary Systems
Identification Number or DOI: 10.1088/0004-637X/786/1/68
URI: http://eprints.usq.edu.au/id/eprint/32080

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