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OGLE-TR-211 We Thus, Ephemeris Astronomy & Astrophysics manuscript no. pap c ESO 2008 February 2, 2008 OGLE-TR-211 – a new transiting inflated hot Jupiter from the OGLE survey and ESO LP666 spectroscopic follow-up program ⋆ A. Udalski1,2, F. Pont3, D. Naef 4, C. Melo4, F. Bouchy 5, N.C. Santos6, C. Moutou7, R.F. D´ıaz8, W. Gieren9, M. Gillon3, S. Hoyer10, M. Mayor3, T. Mazeh11, D. Minniti12, G. Pietrzy´nski1,2,9, D. Queloz3, S. Ramirez5, M.T. Ruiz10, O. Tamuz11, S. Udry3, M. Zoccali12, M. Kubiak1,2, M.K. Szyma´nski1,2, I. Soszy´nski1,2, O. Szewczyk1,2,9, K. Ulaczyk1,2, Ł. Wyrzykowski2,13 1 Warsaw University Observatory, Al. Ujazdowskie 4, 00-478, Warsaw, Poland 2 The OGLE Team 3 Observatoire de Gen`eve, 51 Chemin des Maillettes,1290 Sauverny, Switzerland 4 European Southern Observatory, Casilla 19001, Santiago 19, Chile 5 Institut d’Astrophysique de Paris, 98bis Bd Arago, 75014 Paris, France 6 Centro de Astrof´ısica, Universidade do Porto, Rua das Estrelas, 4150-762 Porto, Portugal 7 Laboratoire d’Astrophysique de Marseille, Traverse du Siphon, BP8, Les Trois Lucs, 13376 Marseille cedex 12, France 8 Instituto de Astronomia y F´ısica del Espacio (CONICET-UBA), Buenos Aires, Argentina 9 Departamento de Fisica, Astronomy Group, Universidad de Concepci´on, Casilla 160-C, Concepci´on, Chile 10 Department of Astronomy, Universidad de Chile, Santiago, Chile 11 School of Physics and Astronomy, R. and B. Sackler Faculty of Exact Sciences, Tel Aviv University, Tel Aviv, Israel 12 Departmento de Astronom´ıa y Astrof´ısica, Pontificia Universidad Cat´olica de Chile, Casilla 306, Santiago 22, Chile 13 Institute of Astronomy, University of Cambridge, Madingley Road, Cambridge CB3 0HA, UK Received date / accepted date ABSTRACT We present results of the photometric campaign for planetary and low-luminosity object transits conducted by the OGLE survey in 2005 season (Campaign #5). About twenty most promising candidates discovered in these data were subsequently verified spectro- scopically with the VLT/FLAMES spectrograph. One of the candidates, OGLE-TR-211, reveals clear changes of radial velocity with small amplitude of 82 m/sec, varying in phase with photometric transit ephemeris. Thus, we confirm the planetary nature of the OGLE-TR-211 system. Follow-up precise photometry of OGLE-TR-211 with VLT/FORS together with radial velocity spectroscopy supplemented with high resolution, high S/N VLT/UVES spectra allowed us to derive parameters of the planet and host star. OGLE-TR-211b is a hot Jupiter orbiting a F7-8 spectral type dwarf +0.18 star with the period of 3.68 days. The mass of the planet is equal to 1.03±0.20 MJup while its radius 1.36 −0.09 RJup. The radius is about 20% larger than the typical radius of hot Jupiters of similar mass. OGLE-TR-211b is, then, another example of inflated hot Jupiters – a small group of seven exoplanets with large radii and unusually small densities – objects being a challenge to the current models of exoplanets. Key words. planetary systems – stars: individual: OGLE-TR-211 arXiv:0711.3978v1 [astro-ph] 26 Nov 2007 1. Introduction important parameters like radius, mass and density can be pre- cisely derived from observations providing direct comparison The discovery of the first transit of an extrasolar planet in with models and, thus, allowing better understanding of the exo- HD209458 (Charbonneau et al. 2000; Henry et al. 2000) opened planet structure and evolution. Also a large variety of follow-up a new era in the extrasolarplanet field – the epoch of searches for observations can be performed on transiting system allowing, extrasolar planets with large scale photometric surveys. While for example, studies of planetary atmospheres, search for other this channel of finding exoplanets developed relatively slowly planetary companions etc. in the first couple of years after that discovery, the last two years brought a fast acceleration due to maturing of the search Transiting planets are discovered via two channels: photo- methods. At present about 25 transiting planets are known (cf. metric follow-up of spectroscopically found exoplanets and clas- http://obswww.unige.ch∼pont/TRANSITS.htm) constituting about sical transit method approach – large scale photometric surveys 10% of all known exoplanets. providing transiting candidates that have to be then verified and Transiting planets play especially important role among the confirmed spectroscopically. Both approaches have been suc- known exoplanets. These are the only objects for which the most cessful in providingexamples of very large diversity among tran- Send offprint requests to: [email protected] siting planets – regular hot Jupiters, very hot Jupiters on ex- ⋆ Based on observations made with the FORS1 camera and the tremely short 1–2 day period orbits, inflated objects with radii FLAMES/UVES spectrograph at the VLT, ESO, Chile (programmes much larger than expected from modeling or small Neptune- 07.C-0706, 076.C-0122 and 177.C-0666) and 1.3-m Warsaw Telescope sized objects. Large number of new extrasolar transiting planets at Las Campanas Observatory, Chile. are expected to be discovered in the next couple of years from 2 A. Udalski et al.: OGLE-TR-211 – a new transiting hot Jupiter the space missions like Corot or Kepler, in particular small size Table 1. Equatorial coordinates of the fields observed during the planets undetectable in ground-based searches. OGLE Campaign #5. The Optical Gravitational Lensing Experiment (OGLE) was the first successful photometric survey that discovered large Field RA(J2000) DEC(J2000) number of transiting candidates that were subsequently veri- − fied spectroscopically (Udalski et al. 2002a,b,c, 2003). Five of CAR107 10:47:15 62:00:25 CAR108 10:47:15 −61:24:35 these candidates, OGLE-TR-56, OGLE-TR-113, OGLE-TR- CAR109 10:42:10 −62:10:25 132, OGLE-TR-111 and OGLE-TR-10 turned out to be ex- CAR110 10:42:15 −61:34:35 trasolar planetary systems (Konacki et al. 2003; Bouchy et al. 2004; Konacki et al. 2004; Pont et al. 2004; Bouchy et al. 2005; Konacki et al. 2005), the first extrasolar planets discovered with all observationssmaller than 0.015 mag, were subject to detrend- the transit method. Moreover, two planet-sized stars of low- ing algorithm of Kruszewski & Semeniuk (2003) and then tran- est known masses were also found (Pont et al. 2005b, 2006). sit search procedure using the BLS algorithm of Kov´acs et al. Beside that the OGLE photometric transit campaigns provided (2002). Altogether light curves of about 50000 stars were ana- a huge observational material allowing better understanding the lyzed. The list of transiting candidates was prepared after care- problems of photometric transit searches, data systematics etc. ful visual inspection of candidates that passed the BLS criteria. (Gould et al. 2006; Pont, Zucker & Queloz 2006). Clear false cases triggered, for example, by noisy light curves OGLE transit campaigns have been conducted every year were removed,as well as objects with the depth of transits larger since 2001. Results of the spectroscopic follow-up of candidates than 50 mmag, those with clear signature of ellipsoidal effect discovered during the Campaign #1 (2001) and #2 (2002) were indicating massive secondary, those with clear V-shape of tran- published by Bouchy et al. (2005) and Pont et al. (2005a), re- sits indicating grazing eclipses of a binary star and those with spectively. Recently, analysis of the near threshold candidates the number of individual transits smaller than three. For all the from the Campaign #2 led to the discovery of the sixth OGLE candidates the limits on the size of a transiting companion were transiting exoplanet, OGLR-TR-182 (Pont et al. 2007). calculated as in Udalski et al. (2004). All candidates with the In this paper we present results of the OGLE Campaign #5 companion having the lower limit of radius larger than 0.2 R⊙ conducted in 2005 and spectroscopic follow-up of the best tran- were removed from the final list. siting candidates detected in these data. A new transiting extra- Table 2 lists the transit candidates from the OGLE solar planetary system OGLE-TR-211 was found among them. Campaign #5 that passed the photometric search criteria. The In the following Sections we provide the details of the photomet- naming convention follows the standard OGLE convention, ric and spectroscopic observations of OGLE new candidates and i.e., OGLE-TR-NNN. About twenty candidates for transit- derive parameters of a planetary companion in OGLE-TR-211 ing planetary systems were found. These objects were se- system. lected as targets for spectroscopic follow-up observations con- ducted under the LP666 Program. Photometry of all selected candidates is available from the OGLE Internet archive at 2. OGLE planetary transit campaign #5 ftp://ftp.astrouw.edu.pl/ogle/ogle3/transits/tr201-219/ OGLE planetary transit campaigns became a standard part of the OGLE observing schedule. About 75% of observing time 3. Spectroscopic follow-up is devoted to this sub-project of the OGLE survey every south- ern fall – from February to April. The OGLE planetary cam- Spectroscopic follow-up observations of the OGLE Campaign paign #5 was conducted by OGLE in the 2005 observing sea- #5 transit candidates were carried out during three observ- son from February 2, 2005 to June 23, 2005. Observations were ing slots allocated to the LP666 program in April/May 2006, carried out with the 1.3-m Warsaw Telescope at Las Campanas February 2007 and April 2007 on VLT with the FLAMES spec- Observatory, equipped with 8192×8192pixel CCD mosaic cam- trograph. Also, part of the Geneva group observing time un- era (Udalski 2003). The observing strategy was similar to that der program 07.C-0706, on the same instrument in February of the previous campaigns, in particular #3 and #4 (Udalski et al.
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