[en] The motivation, techniques and performance of the ground-based photometric follow-up of transit detections by the CoRoT space mission are presented. Its principal raison d’être arises from the much higher spatial resolution of common ground-based telescopes in comparison to CoRoT’s cameras. This allows the identification of many transit candidates as arising from eclipsing binaries that are contaminating CoRoT’s lightcurves, even in low-amplitude transit events that cannot be detected with ground-based obervations. For the ground observations, “on” – “off” photometry is now largely employed, in which only a short timeseries during a transit
and a section outside a transit is observed and compared photometrically. CoRoTplanet candidates’ transits are being observed by a dedicated team with access to telescopes with sizes ranging from 0.2 to 2 m. As an example, the process that led to the rejection of contaminating eclipsing binaries near the host star of the Super-Earth planet CoRoT-7b is shown. Experiences and techniques from this work may also be useful for other transit-detection experiments, when the discovery instrument obtains data with a relatively low angular resolution.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Deeg, H. J.
Gillon, Michaël ; Université de Liège - ULiège > Département d'astrophys., géophysique et océanographie (AGO) > Astrophysique et traitement de l'image
Almenara, J. M., Deeg, H. J., Aigrain, S., et al. 2009, A&A, 506, 337
Almenara, J. M., Deeg, H. J., Régulo, C., & Alonso, R. 2007, in Transiting Extrapolar Planets Workshop, ed. C. Afonso, D. Weldrake, & T. Henning, ASP Conf. Ser., 366, 183
Alonso, R., Deeg, H. J., Brown, T. M., & Belmonte, J. A. 2004, Astron. Nachr., 325, 594
Bordé, P., Rouan, D., & Léger, A. 2003, A&A, 405, 1137
Boulade, O., Charlot, X., Abbon, P., et al. 2003, in SPIE Conf. Ser., 4841, ed. M. Iye, & A. F. M. Moorwood, 72
Brown, T. M. 2003, ApJ, 593, L125
Cabrera, J., Fridlund, M., Ollivier, M., et al. 2009, A&A, 506, 501
Deeg, H. J. & Doyle, L. R. 2001, in Third Workshop on Photometry, ed. W. J. Borucki, & L. E. Lasher, 85
Deeg, H. J., Doyle, L. R., Kozhevnikov, V. P., et al. 2000, A&A, 358, L5
Deeg, H. J., Ocaña, B., Kozhevnikov, V. P., et al. 2008, A&A, 480, 563
Deleuil, M., Meunier, J., Moutou, C., et al. 2009, AJ, 138, 649
Deleuil, M., Moutou, C., Deeg, H., et al. 2006, in ESA SP, 1306, 341
Eislöffel, J., Kürster, M., Hatzes, A. P., & Guenther, E. 2004, in ESA Special Publication, Stellar Structure and Habitable Planet Finding, ed. F. Favata, S. Aigrain, & A. Wilson, 538, 81
Garrido, R., & Deeg, H. J. 2006, Lecture Notes and Essays in Astrophysics, 2, 27
Gillon, M., Magain, P., Chantry, V., et al. 2007, in Transiting Extrapolar Planets Workshop, ed. C. Afonso, D. Weldrake, & T. Henning, ASP Conf. Ser., 366, 113
Kabath, P., Eigmüller, P., Erikson, A., et al. 2007, AJ, 134, 1560
Kabath, P., Eigmüller, P., Erikson, A., et al. 2008, AJ, 136, 654
Kabath, P., Erikson, A., Rauer, H., et al. 2009a, A&A, A&A, 506, 569
Karoff, C., Rauer, H., Erikson, A., et al. 2007, AJ, 134, 766
Léger, A., Rouan, D., Schneider, J., et al. 2009, A&A, 506, 287
Martín, E. L., Zapatero Osorio, M. R., & Lehto, H. J. 2001, ApJ, 557, 822
Moutou, C., Aigrain, S., Almenara, J., et al. 2007, in Transiting Extrapolar Planets Workshop, ed. C. Afonso, D. Weldrake, & T. Henning, ASP Conf. Ser., 366, 127