Near-term detectability of terrestrial extrasolar planets: TEP network observations of CM Draconis

Show simple item record Deeg, Hans en_US Doyle, Laurance en_US Kozhevnikov, Valerij en_US Martin, Eduardo en_US Oetiker, Brian en_US Paleologou, Efthimious en_US Schneider, Jean en_US Afonso, Cristina en_US Dunham, Edward en_US Jenkins, Jon en_US Ninkov, Zoran en_US Stone, Remington en_US Zakharova, Polina en_US 2006-05-23T18:50:08Z en_US 2006-05-23T18:50:08Z en_US 1998-10 en_US
dc.identifier.citation Astronomy and Astrophysics 338 (1998) 479-490 en_US
dc.identifier.issn 1432-0746 en_US
dc.identifier.uri en_US
dc.description Also archived in: arXiv: astro-ph/9806371 v1 29 Jun 1998 en_US
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dc.description.abstract Results from a photometric search for extrasolar planetary transits across the eclipsing binary CM Dra are presented. The TEP (Transits of Extrasolar Planets) network has observed this star since 1994, and a lightcurve with 617 hours of coverage has been obtained. The data give a complete phase coverage of the CM Dra system at each of the 3 years of observations, with a noise of less than 5 mmag. New epoch and period values for CM Dra are derived, and a low flare rate of 0.025 hr^−1 has been confirmed. The absence of periodic variations in eclipse minimum times excludes the presence of very massive planets with periods of less than a few years. The lightcurve was visually scanned for the presence of unusual events which may be indicative of transits of extrasolar planets with ’massive earth’ sizes. Six suspicious events were found which are being followed up for future transits, by planets with sizes between 1.5 and 2.5 RE (Earth Radii). However, none of these events has amplitudes compatible with planets larger than 2.5 RE. Coplanar planets larger than 2.5 RE and with orbital periods of less than 60 days can therefore be ruled out with a confidence of about 80%. Planets smaller than 1.5 RE cannot be detected in the data without a sub-noise detection algorithm. A preliminary signal detection analysis shows that there is a 50% detection confidence for 2 RE planets with a period from 10 to 30 days with the current data. This data-set demonstrates that it is possible to detect terrestrial sized planets with ground based photometry, and that strong constraints on the sizes of planets orbiting in the plane of the CM Dra system can be set (Refer to PDF file for exact formulas). en_US
dc.description.sponsorship The TEP network wishes to thank numerous people, without whose support the acquisition of these data would have been impossible. The observations by LRD and RS at the oldest reflecting telescope still in professional use - the Crossley Telescope at Lick Observatory - were very support intensive and we thank Ellen Blue, Moira Doyle, Neil Heather, Dave Koch, and the time allocation committee at UC Santa Cruz for their support. For observations and reductions at Capilla Peak, we thank Randy Grashuis. We thank Ayvur Akalin who helped us with an implementation of the Kwee-v. Woerden algorithm. We also thank Woo-Baik Lee and Ho-Il Kim at the Korean Astronomy Observatory for helpful correspondence. The IAC80 telescope is operated at Iza˜na Observatory, Tenerife by the Instituto de Astrofisica de Canarias. We thank the University of Rochester for use of the Mees Telescope. HJD acknowledges a postdoctoral fellowship from the Rochester Institute of Technology in 1994, and later a grant ’Formaci´on de Personal Investigador’ from the Ministry for Education and Culture of Spain. The observations by LRD were supported in part by a grant from the NASA Ames Research Center Director’s Discretionary Fund. JS acknowledges funding provided by the French ’Programme National de Planetologie (CNRS)’. en_US
dc.format.extent 289727 bytes en_US
dc.format.mimetype application/pdf en_US
dc.language.iso en_US en_US
dc.publisher Springer Verlag: Astronomy and Astrophysics en_US
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dc.relation.ispartofseries vol. 338 en_US
dc.relation.ispartofseries no. 2 en_US
dc.relation.ispartofseries pps. 479-490 en_US
dc.subject Binaries-eclipsing en_US
dc.subject Planetary systems en_US
dc.subject Stars-flare en_US
dc.subject Stars-individual (CM Draconis) en_US
dc.subject Stars-low mass en_US
dc.subject Techniques-photometric en_US
dc.title Near-term detectability of terrestrial extrasolar planets: TEP network observations of CM Draconis en_US
dc.type Article en_US

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