THREE NEW ECLIPSING WHITE-DWARF-M-DWARF BINARIES DISCOVERED IN A SEARCH FOR TRANSITING PLANETS AROUND M-DWARFS

We present three new eclipsing white-dwarf/M-dwarf binary systems discovered during a search for transiting planets around M-dwarfs. Unlike most known eclipsing systems of this type, the optical and infrared emission is dominated by the M-dwarf components, and the systems have optical colors and dis...

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Bibliographic Details
Published in:	The Astrophysical journal 2012-10, Vol.757 (2), p.133-14
Main Authors:	Law, Nicholas M., Kraus, Adam L., Street, Rachel, Fulton, Benjamin J., Hillenbrand, Lynne A., Shporer, Avi, Lister, Tim, Baranec, Christoph, Bloom, Joshua S., Bui, Khanh, Burse, Mahesh P., Cenko, S. Bradley, Das, H. K., Davis, Jack. T. C., Dekany, Richard G., Filippenko, Alexei V., Kasliwal, Mansi M., Kulkarni, S. R., Nugent, Peter, Ofek, Eran O., Poznanski, Dovi, Quimby, Robert M., Ramaprakash, A. N., Riddle, Reed, Silverman, Jeffrey M., Sivanandam, Suresh, Tendulkar, Shriharsh P.
Format:	Article
Language:	eng
Subjects:	ALGORITHMS ASTRONOMY ASTROPHYSICS ASTROPHYSICS, COSMOLOGY AND ASTRONOMY BINARY STARS DATA ANALYSIS ECLIPSE HYDROGEN JUPITER PLANET LEAST SQUARE FIT MASS OPTICS PHOTOMETRY PHOTON EMISSION RADIAL VELOCITY SATELLITES STELLAR ATMOSPHERES VISIBLE RADIATION WHITE DWARF STARS
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Summary:	We present three new eclipsing white-dwarf/M-dwarf binary systems discovered during a search for transiting planets around M-dwarfs. Unlike most known eclipsing systems of this type, the optical and infrared emission is dominated by the M-dwarf components, and the systems have optical colors and discovery light curves consistent with being Jupiter-radius transiting planets around early M-dwarfs. We detail the PTF/M-dwarf transiting planet survey, part of the Palomar Transient Factory (PTF). We present a graphics processing unit (GPU)-based box-least-squares search for transits that runs approximately 8 x faster than similar algorithms implemented on general purpose systems. We use the Robo-AO laser guide star adaptive optics system to tentatively identify one of the objects as a triple system. We also use high-cadence photometry to put an upper limit on the white-dwarf radius of 0.025 R sub([middot in circle]) (95% confidence) in one of the systems. We present several ways to rapidly distinguish these binaries from transiting planet systems.
ISSN:	0004-637X 1538-4357