Discovery Of A New AM CVn System With The Kepler Satellite

dc.contributor.utaustinauthorMontgomery, Michael H.en_US
dc.creatorFontaine, G.en_US
dc.creatorBrassard, P.en_US
dc.creatorGreen, E. M.en_US
dc.creatorCharpinet, S.en_US
dc.creatorDufour, Patricken_US
dc.creatorHubeny, I.en_US
dc.creatorSteeghs, D.en_US
dc.creatorAerts, C.en_US
dc.creatorRandall, S. K.en_US
dc.creatorBergeron, P.en_US
dc.creatorGuvenen, B.en_US
dc.creatorO'Malley, C. J.en_US
dc.creatorVan Grootel, V.en_US
dc.creatorOstensen, R. H.en_US
dc.creatorBloemen, S.en_US
dc.creatorSilvotti, R.en_US
dc.creatorHowell, Steve B.en_US
dc.creatorBaran, A.en_US
dc.creatorKepler, S. O.en_US
dc.creatorMarsh, T. R.en_US
dc.creatorMontgomery, Michael H.en_US
dc.creatorOreiro, R.en_US
dc.creatorProvencal, J.en_US
dc.creatorTelting, J.en_US
dc.creatorWinget, D. E.en_US
dc.creatorZima, W.en_US
dc.creatorChristensen-Dalsgaard, J.en_US
dc.creatorKjeldsen, H.en_US
dc.description.abstractWe report the discovery of a new AM CVn system on the basis of broadband photometry obtained with the Kepler satellite supplemented by ground-based optical spectroscopy. Initially retained on Kepler target lists as a potential compact pulsator, the blue object SDSS J190817.07+394036.4 (KIC 004547333) has turned out to be a high-StateAM CVn star showing the He-dominated spectrum of its accretion disk significantly reddened by interstellar absorption. We constructed new grids of NLTE synthetic spectra for accretion disks in order to analyze our spectroscopic observations. From this analysis, we infer preliminary estimates of the rate of mass transfer, the inclination angle of the disk, and the distance to the system. The AM CVn nature of the system is also evident in the Kepler light curve, from which we extracted 11 secure periodicities. The luminosity variations are dominated by a basic periodicity of 938.507 s, likely to correspond to a superhump modulation. The light curve folded on the period of 938.507 s exhibits a pulse shape that is very similar to the superhump wavefront seen in AM CVn itself, which is a high-Statesystem and the prototype of the class. Our Fourier analysis also suggests the likely presence of a quasi-periodic oscillation similar to those already observed in some high-StateAM CVn systems. Furthermore, some very low-frequency, low-amplitude aperiodic photometric activity is likely present, which is in line with what is expected in accreting binary systems. Inspired by previous work, we further looked for and found some intriguing numerical relationships between the 11 secure detected frequencies, in the sense that we can account for all of them in terms of only three basic clocks. This is further evidence in favor of the AM CVn nature of the system.en_US
dc.description.sponsorshipNSERC of Canadaen_US
dc.description.sponsorshipProgramme National de Physique Stellaire (PNPS)en_US
dc.description.sponsorshipCentre National d'Etudes Spatiales (CNES)en_US
dc.description.sponsorshipEuropean Research Council under the European Community/ERC FP7/2007-2013, 227224en_US
dc.description.sponsorshipNational Science Foundation AST-0909107en_US
dc.description.sponsorshipNorman Hackerman Advanced Research Program 003658-0255-2007, 003658-0252-2009en_US
dc.description.sponsorshipDelaware Asteroseismic Research Centeren_US
dc.identifier.citationFontaine, Gilles, Pierre Brassard, Elizabeth M. Green, Sebastien Charpinet, Patrick Dufour, Ivan Hubeny, Danny Steeghs et al. "Discovery of a new AM CVn system with the Kepler satellite." The Astrophysical Journal, Vol. 726, No. 2 (Jan., 2011): 92.en_US
dc.relation.ispartofserialAstrophysical Journalen_US
dc.rightsAdministrative deposit of works to Texas ScholarWorks: This works author(s) is or was a University faculty member, student or staff member; this article is already available through open access or the publisher allows a PDF version of the article to be freely posted online. The library makes the deposit as a matter of fair use (for scholarly, educational, and research purposes), and to preserve the work and further secure public access to the works of the University.en_US
dc.subjectaccretion, accretion disksen_US
dc.subjectbinaries: closeen_US
dc.subjectstars: individual (sdssen_US
dc.subjectj190817.07+394036.4, kic 004547333)en_US
dc.subjectwhite dwarfsen_US
dc.subjectactive galactic nucleien_US
dc.subjectnon-lte modelsen_US
dc.subjectaccretion-disc modelsen_US
dc.subjectcanum-venaticorum systemsen_US
dc.subjecttheoretical spectraen_US
dc.subjectspectroscopic evidenceen_US
dc.subjectcataclysmic binariesen_US
dc.subjectvertical structureen_US
dc.subjectastronomy & astrophysicsen_US
dc.titleDiscovery Of A New AM CVn System With The Kepler Satelliteen_US
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