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Hoyer, S.; Alegría, S.R.; Ivanov, V.D.; Minniti, D.; Pietrzyński, G.; Ruíz, M.T.; Gieren, W.; Udalski, A.; Zoccali, M.; Carrasco, E.R.; Díaz, R.F.; Fernández, J.M.; Gallardo, J.; Rejkuba, M.; Pérez, F. "Millimagnitude photometry for transiting extrasolar planetary candidates. IV. Solution to the puzzle of the extremely red OGLE-TR-82 primary" (2007) Astrophysical Journal. 669(2):1345-1353
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Abstract:

We present precise new V-, I-, and Ks-band photometry for the planetary-transit candidate star OGLE-TR-82. V-band images acquired in good seeing with the VIMOS instrument at the Very Large Telescope allowed us to measure V= 20.61 ± 0.03 mag for this star despite the presence of a brighter neighbor about 1″ away. This faint magnitude answers the question why it has not been possible to measure radial velocities for this object. One transit of this star has been observed with the GMOS-S instrument on Gemini South in the i and g bands, which allowed us to verify that this is not a false positive, to confirm the transit amplitude measured by OGLE, and to improve the ephemeris. The transit is better defined in the i-band light curve (with a depth of Ai = 0.034 mag), than in the g band (Ag = 0.1 mag), in which the star is significantly fainter. Near-IR photometry obtained with the SOFI array at the ESO New Technology Telescope yields K= 12.20 ± 0.10 and V-K= 8.40 ± 0.10, so red that it is unlike any transit candidate studied before. With the new data, we consider two possible configurations for the system: (1) a nearby M7 V star or (2) a blend with a very reddened, distant red giant. The first hypothesis would give a radius for the companion of R p = 0.3 ± 0.1 RJ, i.e., the size of Neptune. Quantitative analysis of near-IR spectroscopy finally shows that OGLE-TR-82 is a distant, reddened, metal-poor early K giant, confirmed by direct comparison with stellar templates, which gives as a best match a K3 III star. Therefore, we rule out a planetary nature for the companion, and conclude that this system is a main-sequence binary blended with a background red giant. As a case study, a system that can so mimic a planetary transit presents a lesson for future transit surveys. © 2007. The American Astronomical Society. All rights reserved.

Registro:

Documento: Artículo
Título:Millimagnitude photometry for transiting extrasolar planetary candidates. IV. Solution to the puzzle of the extremely red OGLE-TR-82 primary
Autor:Hoyer, S.; Alegría, S.R.; Ivanov, V.D.; Minniti, D.; Pietrzyński, G.; Ruíz, M.T.; Gieren, W.; Udalski, A.; Zoccali, M.; Carrasco, E.R.; Díaz, R.F.; Fernández, J.M.; Gallardo, J.; Rejkuba, M.; Pérez, F.
Filiación:Departamento de Astronomía, Universidad de Chile, Las Condes, Santiago, Chile
Departamento de Astronomía y Astrofísica, Pontificia Universidad Católica de Chile, Santiago 22, Chile
European Southern Observatory, Vitacura, Santiago 19, Chile
Departamento de Física, Universidad de Concepción, Concepción, Chile
Obserwatorium Astronomiczne Uniwersytetu Warszawskiego, 00-478 Warsaw, Poland
Gemini Observatory, Southern Operations Center, La Serena, Chile
Instituto de Astronomía y Física del Espacio, CONICET, Universidad de Buenos Aires, C1428ZAA Buenos Aires, Argentina
Harvard-Smithsonian Center for Astrophysics, Cambridge, MA 02138, United States
Centre de Recherche Astronomique de Lyon, Ecole Normale Supérieure de Lyon, F-69364 Lyon, France
European Southern Observatory, D-85748 Garching, Germany
Palabras clave:Planets and satellites: formation; Stars: individual (OGLE-TR-82)
Año:2007
Volumen:669
Número:2
Página de inicio:1345
Página de fin:1353
DOI: http://dx.doi.org/10.1086/520871
Título revista:Astrophysical Journal
Título revista abreviado:Astrophys. J.
ISSN:0004637X
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_0004637X_v669_n2_p1345_Hoyer

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Citas:

---------- APA ----------
Hoyer, S., Alegría, S.R., Ivanov, V.D., Minniti, D., Pietrzyński, G., Ruíz, M.T., Gieren, W.,..., Pérez, F. (2007) . Millimagnitude photometry for transiting extrasolar planetary candidates. IV. Solution to the puzzle of the extremely red OGLE-TR-82 primary. Astrophysical Journal, 669(2), 1345-1353.
http://dx.doi.org/10.1086/520871
---------- CHICAGO ----------
Hoyer, S., Alegría, S.R., Ivanov, V.D., Minniti, D., Pietrzyński, G., Ruíz, M.T., et al. "Millimagnitude photometry for transiting extrasolar planetary candidates. IV. Solution to the puzzle of the extremely red OGLE-TR-82 primary" . Astrophysical Journal 669, no. 2 (2007) : 1345-1353.
http://dx.doi.org/10.1086/520871
---------- MLA ----------
Hoyer, S., Alegría, S.R., Ivanov, V.D., Minniti, D., Pietrzyński, G., Ruíz, M.T., et al. "Millimagnitude photometry for transiting extrasolar planetary candidates. IV. Solution to the puzzle of the extremely red OGLE-TR-82 primary" . Astrophysical Journal, vol. 669, no. 2, 2007, pp. 1345-1353.
http://dx.doi.org/10.1086/520871
---------- VANCOUVER ----------
Hoyer, S., Alegría, S.R., Ivanov, V.D., Minniti, D., Pietrzyński, G., Ruíz, M.T., et al. Millimagnitude photometry for transiting extrasolar planetary candidates. IV. Solution to the puzzle of the extremely red OGLE-TR-82 primary. Astrophys. J. 2007;669(2):1345-1353.
http://dx.doi.org/10.1086/520871