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dc.creatorHermes, J. J.en
dc.creatorMullally, F.en
dc.creatorWinget, D. E.en
dc.creatorMontgomery, M. H.en
dc.creatorMiller, G. F.en
dc.creatorEllis, J. L.en
dc.date.accessioned2015-04-16T14:48:32Zen
dc.date.available2015-04-16T14:48:32Zen
dc.date.issued2010-08en
dc.identifier.citationJ. J. Hermes, F. Mullally, D. E. Winget, M. H. Montgomery, G. F. Miller, J. L. Ellis. AIP Conference Proceedings 1273, 446 (Aug., 2010); doi: 10.1063/1.3527860en
dc.identifier.issn0094-243Xen
dc.identifier.issn978-0-7354-0823-4en
dc.identifier.urihttp://hdl.handle.net/2152/29517en
dc.description.abstractWe have continued monitoring a pilot sample of 15 isolated, pulsating DA white dwarfs for center-of-mass motion caused by a planetary companion. Roughly 7 years into our survey, we have preliminary evidence for periodic variations in pulse arrival times for at least two white dwarfs in our sample. The variations in these systems are unlikely to be caused by secular evolution and are possibly the result of motion of the white dwarf around a center of mass. We have yet to claim confirmation of a planet. GD66 is a previously published candidate system, with a modulation in pulse arrival times that could be caused by a 2.0 M-J sin i planetary companion with an 8.3 year orbital period. Another candidate system, WD1354+0108, has a phase modulation consistent with a 0.7 M-J sin i planet at 2.3 AU (a 4.5 year orbit). We see similar behavior in two independent frequencies within this star, and while a sinusoid is currently a marginally better fit to the data than a straight line (as we might expect from cooling alone in a DAV), we are hesitant to over-interpret our results. Finally, we have a third system, WD0018+0031, that shows a change in pulse arrival times inconsistent with cooling alone; a 2.7 M-J planet at an orbit of about 5 AU could cause the observed trend. Observations of these candidate systems are ongoing in order to constrain any planetary companions that may be present.en
dc.language.isoEnglishen
dc.rightsAdministrative deposit of works to UT Digital Repository: 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
dc.subjectstars: white dwarfsen
dc.subjectstars: oscillationsen
dc.subjectstars: planetary systemsen
dc.subjectstars: individual (gd66, wd1354+0108, wd0018+0031)en
dc.subjectg117-b15aen
dc.subjectlimitsen
dc.subjectastronomy & astrophysicsen
dc.titleA Status Report On A Planet Search Around White Dwarf Starsen
dc.typeArticleen
dc.description.departmentAstronomyen
dc.identifier.doidoi: 10.1063/1.3527860en
dc.contributor.utaustinauthorHermes, J. J.en
dc.contributor.utaustinauthorWinget, D. E.en
dc.contributor.utaustinauthorMontgomery, M. H.en
dc.contributor.utaustinauthorMiller, G. F.en
dc.contributor.utaustinauthorEllis, J. L.en
dc.relation.ispartofserial17th European White Dwarf Workshopen_US


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