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    Two more candidate AM Canum Venaticorum (AM CVn) Binaries from the Sloan Digital Sky Survey

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    Date
    2008-06
    Author
    Anderson, Scott
    Becker, Andrew
    Haggard, Daryl
    Prieto, Jose Luis
    Knapp, Gillian
    Sako, Masao
    Halford, Kelly
    Jha, Saurabh
    Martin, Blake
    Holtzman, Jon
    Frieman, Joshua
    Garnavich, Peter
    Hayward, Suzanne
    Ivezic, Zeljko
    Mukadam, Anjum
    Sesar, Branimir
    Szkody, Paula
    Malanushenko, Viktor
    Richmond, Michael
    Schneider, Donald
    York, Donald
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    Abstract
    AM CVn systems are a select group of ultracompact binaries with the shortest orbital periods of any known binary subclass; mass-transfer is likely from a low-mass (partially-)degenerate secondary onto a white dwarf primary, driven by gravitational radiation. In the past few years, the Sloan Digital Sky Survey (SDSS) has provided five new AM CVns. Here we report on two further candidates selected from more recent SDSS data. SDSS J1208+3550 is similar to the earlier SDSS discoveries, recognized as an AM CVn via its distinctive spectrum which is dominated by helium emission. From the expanded SDSS Data Release 6 (DR6) spectroscopic area, we provide an updated surface density estimate for such AM CVns of order 10−3 . 1 to 10−2 . 5 deg−2 for 15 < g < 20.5. In addition, we present another new candidate AM CVn, SDSS J2047+0008, that was discovered in the course of followup of SDSS-II supernova candidates. It shows nova-like outbursts in multi-epoch imaging data; in contrast to the other SDSS AM CVn discoveries, its (outburst) spectrum is dominated by helium absorption lines, reminiscent of KL Dra and 2003aw. The variability selection of SDSS J2047+0008 from the 300 deg2 of SDSS Stripe 82 presages further AM CVn discoveries in future deep, multicolor, and time-domain surveys such as LSST. The new additions bring the total SDSS yield to seven AM CVns thus far, a substantial contribution to this rare subclass, versus the dozen previously known.
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    http://hdl.handle.net/1850/7517
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