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

Show simple item record 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 2008-11-17T16:39:10Z 2008-11-17T16:39:10Z 2008-06
dc.identifier.citation The Astronomical Journal 135 (2008) 2108-2113 en_US
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dc.description.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. en_US
dc.language.iso en_US en_US
dc.publisher American Astronomical Society - The Astronomical Journal en_US
dc.relation.ispartofseries vol. 135 en_US
dc.relation.ispartofseries no. 6 en_US
dc.relation.ispartofseries pps. 2108-2113 en_US
dc.subject Binaries - close en_US
dc.subject Stars - individual (SDSS J120841.96+355025.2, SDSS J204739.40+000840.3) en_US
dc.subject white dwarfs
dc.subject cataclysmic variables
dc.subject novae
dc.title Two more candidate AM Canum Venaticorum (AM CVn) Binaries from the Sloan Digital Sky Survey en_US
dc.type Article en_US

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