Browsing by Author "Pietrzynski, Grzegorz"

Now showing 1 - 5 of 5
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    Millimagnitude photometry for OGLE transiting extrasolar planetary transits
    (2005) Minniti, D.; Fernández Contreras, José Miguel; Gieren, Wolfgang; Pietrzynski, Grzegorz; Ruíz, María Teresa; Udalski, Andrzej; Szeifert, Thomas; Ramírez, Sebastián; Zoccali, Manuela
    VLT images in the V-band are used to make light curves of transits of candidate OGLE planets. The data for some of the targets are complemented with NTT K-band images. Using difference image photometry, we are able to achieve milli-mag errors in the individual datapoints. Here we discuss the observations, and data reductions. We also present the preliminary results for OGLE-TR-109, arguing that it is likely to be a new transiting planet....
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    Millimagnitude photometry for transiting extrasolar planetary candidates.: II. transits of OGLE-TR-113-B in the optical and near-ir
    (2007) Diaz, Rodrigo F.; Ramirez, Sebastían; Fernandez, José Miguel; Gallardo, José; Gieren, Wolfgang; Ivanov, Valentin D.; Mauas, Pablo; Minniti, Dante; Pietrzynski, Grzegorz; Perez, Felipe; Ruiz, Maria Teresa; Udalski, Andrzej; Zoccali, Manuela
    We present precise V-and K-s-band transit photometry for the planetary host star OGLE-TR-113. Using the Ks-band photometry, we confirm the dwarf nature of OGLE-TR-113 and obtain new estimates for its effective temperature, distance, and reddening. We employ the V-band photometry to obtain planetary and orbit parameters from the transit fit, alpha = 0.0232 +/- 0: 0038 AU, orbital period P = 1.4324752 +/- 0.0000015 day, i = 86.7-90, and R-p 1.09 +/- 0.09 R-J. These values are in excellent agreement with previous works. Assuming a mass M-p 1.32 +/- 0.19 M-J for the planet, we obtain its mean density p = 1.26 +/- 0.50 g cm(-3), also in agreement with previous works. The transit observed in the K-s-band has a larger scatter, and we find its amplitude to be consistent with that in the V band. In this way, we find an independent confirmation of the planetary nature of OGLE-TR-113b.
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    Millimagnitude photometry for transiting extrasolar planetary candidates.: III. accurate radius and period for OGLE-TR-111-B
    (2007) Minniti, Dante; Fernandez, José Miguel; Diaz, Rodrigo F.; Udalski, Andrzej; Pietrzynski, Grzegorz; Gieren, Wolfgang; Rojo, Patricio; Ruiz, María Teresa; Zoccali, Manuela
    We present accurate V-band photometry for a planetary transit of OGLE-TR-111 acquired with VIMOS at the ESO Very Large Telescope. The measurement of this transit allows us to refine the planetary radius, obtaining R-p 1.01 +/- 0.06 R-J. Given the mass of M-p 0.53 M-J previously measured from radial velocities, we confirm that the density is p(p) = 0.6 +/- 0.2 g cm(-3). We also revise the ephemeris for OGLE-TR-111-b, obtaining an accurate orbital period P = 4.014484 +/- 0.000014 days and predicting that the next observable transits would occur around December 2006, and after that only in mid-2008. Even though this period is different from previously published values, we cannot yet rule out a constant period.
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    The Araucaria Project. On the Tip of the Red Giant Branch distance determination to the Magellanic Clouds
    (2016) Gorski, Marek; Pietrzynski, Grzegorz; Gieren Waiblinger, Wolfgang Paul; Catelan, Márcio; Pilecki, Bogumil; Karczmarek, Paulina; Suchomska, Ksenia; Graczyk, Dariusz; Konorski, Piotr; Zgirski, Bartlomiej; Wielgorski, Piotr
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    The Araucaria Project: The First-Overtone Classical Cepheid in the Eclipsing System OGLE-LMC-CEP-2532
    (2015) Pilecki, Bogumil; Graczyk, Dariusz; Gieren Waiblinger, Wolfgang Paul; Pietrzynski, Grzegorz; Thompson, Ian B; Smolec, Radoslaw; Udalski, Andrzej; Soszynski, Igor; Konorski, Piotr; Catelan, Márcio; Gallenne, Alexandre; Minniti, D.; Taormina, Mónica