15 results on '"Alapini, A."'
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2. Transiting exoplanets from the CoRoT space mission *
- Author
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Léger, A., Rouan, D., Schneider, J., Barge, P., Fridlund, M., Samuel, B., Ollivier, M., Guenther, E., Deleuil, M., Deeg, H. J., Auvergne, M., Alonso, R., Aigrain, S., Alapini, A., Almenara, J. M., Baglin, A., Barbieri, M., Bruntt, H., Bordé, P., Bouchy, F., Cabrera, J., Catala, C., Carone, L., Carpano, S., Csizmadia, Sz., Dvorak, R., Erikson, A., Ferraz-Mello, S., Foing, B., Fressin, F., Gandolfi, D., Gillon, M., Gondoin, Ph., Grasset, O., Guillot, T., Hatzes, A., Hébrard, G., Jorda, L., Lammer, H., Llebaria, A., Loeillet, B., Mayor, M., Mazeh, T., Moutou, C., Pätzold, M., Pont, F., Queloz, D., Rauer, H., Renner, S., Samadi, R., Shporer, A., Sotin, Ch., Tingley, B., Wuchterl, G., Adda, M., Agogu, P., Appourchaux, T., Ballans, H., Baron, P., Beaufort, T., Bellenger, R., Berlin, R., Bernardi, P., Blouin, D., Baudin, F., Bodin, P., Boisnard, L., Boit, L., Bonneau, F., Borzeix, S., Briet, R., Buey, J.-T., Butler, B., Cailleau, D., Cautain, R., Chabaud, P.-Y., Chaintreuil, S., Chiavassa, F., Costes, V., Cuna Parrho, V., De Oliveira Fialho, F., Decaudin, M., Defise, J.-M., Djalal, S., Epstein, G., Exil, G.-E., Fauré, C., Fenouillet, T., Gaboriaud, A., Gallic, A., Gamet, P., Gavalda, P., Grolleau, E., Gruneisen, R., Gueguen, L., Guis, V., Guivarc'h, V., Guterman, P., Hallouard, D., Hasiba, J., Heuripeau, F., Huntzinger, G., Hustaix, H., Imad, C., Imbert, C., Johlander, B., Jouret, M., Journoud, P., Karioty, F., Kerjean, L., Lafaille, V., Lafond, L., Lam-Trong, T., Landiech, P., Lapeyrere, V., Larqué, T., Laudet, P., Lautier, N., Lecann, H., Lefevre, L., Leruyet, B., Levacher, P., Magnan, A., Mazy, E., Mertens, F., Mesnager, J.-M., Meunier, J.-C., Michel, J.-P., Monjoin, W., Naudet, D., Nguyen-Kim, K., Orcesi, J.-L., Ottacher, H., Perez, R., Peter, G., Plasson, P., Plesseria, J.-Y., Pontet, B., Pradines, A., Quentin, C., Reynaud, J.-L., Rolland, G., Rollenhagen, F., Romagnan, R., Russ, N., Schmidt, R., Schwartz, N., Sebbag, I., Sedes, G., Smit, H., Steller, M. B., Sunter, W., Surace, C., Tello, M., Tiphène, D., Toulouse, P., Ulmer, B., Vandermarcq, O., Vergnault, E., Vuillemin, A., Zanatta, P., Léger, A., Rouan, D., Schneider, J., Barge, P., Fridlund, M., Samuel, B., Ollivier, M., Guenther, E., Deleuil, M., Deeg, H. J., Auvergne, M., Alonso, R., Aigrain, S., Alapini, A., Almenara, J. M., Baglin, A., Barbieri, M., Bruntt, H., Bordé, P., Bouchy, F., Cabrera, J., Catala, C., Carone, L., Carpano, S., Csizmadia, Sz., Dvorak, R., Erikson, A., Ferraz-Mello, S., Foing, B., Fressin, F., Gandolfi, D., Gillon, M., Gondoin, Ph., Grasset, O., Guillot, T., Hatzes, A., Hébrard, G., Jorda, L., Lammer, H., Llebaria, A., Loeillet, B., Mayor, M., Mazeh, T., Moutou, C., Pätzold, M., Pont, F., Queloz, D., Rauer, H., Renner, S., Samadi, R., Shporer, A., Sotin, Ch., Tingley, B., Wuchterl, G., Adda, M., Agogu, P., Appourchaux, T., Ballans, H., Baron, P., Beaufort, T., Bellenger, R., Berlin, R., Bernardi, P., Blouin, D., Baudin, F., Bodin, P., Boisnard, L., Boit, L., Bonneau, F., Borzeix, S., Briet, R., Buey, J.-T., Butler, B., Cailleau, D., Cautain, R., Chabaud, P.-Y., Chaintreuil, S., Chiavassa, F., Costes, V., Cuna Parrho, V., De Oliveira Fialho, F., Decaudin, M., Defise, J.-M., Djalal, S., Epstein, G., Exil, G.-E., Fauré, C., Fenouillet, T., Gaboriaud, A., Gallic, A., Gamet, P., Gavalda, P., Grolleau, E., Gruneisen, R., Gueguen, L., Guis, V., Guivarc'h, V., Guterman, P., Hallouard, D., Hasiba, J., Heuripeau, F., Huntzinger, G., Hustaix, H., Imad, C., Imbert, C., Johlander, B., Jouret, M., Journoud, P., Karioty, F., Kerjean, L., Lafaille, V., Lafond, L., Lam-Trong, T., Landiech, P., Lapeyrere, V., Larqué, T., Laudet, P., Lautier, N., Lecann, H., Lefevre, L., Leruyet, B., Levacher, P., Magnan, A., Mazy, E., Mertens, F., Mesnager, J.-M., Meunier, J.-C., Michel, J.-P., Monjoin, W., Naudet, D., Nguyen-Kim, K., Orcesi, J.-L., Ottacher, H., Perez, R., Peter, G., Plasson, P., Plesseria, J.-Y., Pontet, B., Pradines, A., Quentin, C., Reynaud, J.-L., Rolland, G., Rollenhagen, F., Romagnan, R., Russ, N., Schmidt, R., Schwartz, N., Sebbag, I., Sedes, G., Smit, H., Steller, M. B., Sunter, W., Surace, C., Tello, M., Tiphène, D., Toulouse, P., Ulmer, B., Vandermarcq, O., Vergnault, E., Vuillemin, A., and Zanatta, P.
- Abstract
Aims. We report the discovery of very shallow ($\Delta F/F \approx 3.4\times 10^{-4}$), periodic dips in the light curve of an active $V = 11.7$G9V star observed by the CoRoT satellite, which we interpret as caused by a transiting companion. We describe the 3-colour CoRoT data and complementary ground-based observations that support the planetary nature of the companion.
- Published
- 2009
- Full Text
- View/download PDF
3. Removing systematics from the CoRoT light curves*
- Author
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Mazeh, T., Guterman, P., Aigrain, S., Zucker, S., Grinberg, N., Alapini, A., Alonso, R., Auvergne, M., Barbieri, M., Barge, P., Bordé, P., Bouchy, F., Deeg, H., De la Reza, R., Deleuil, M., Dvorak, R., Erikson, A., Fridlund, M., Gondoin, P., Jorda, L., Lammer, H., Léger, A., Llebaria, A., Magain, P., Moutou, C., Ollivier, M., Pätzold, M., Pont, F., Queloz, D., Rauer, H., Rouan, D., Sabo, R., Schneider, J., Wuchterl, G., Mazeh, T., Guterman, P., Aigrain, S., Zucker, S., Grinberg, N., Alapini, A., Alonso, R., Auvergne, M., Barbieri, M., Barge, P., Bordé, P., Bouchy, F., Deeg, H., De la Reza, R., Deleuil, M., Dvorak, R., Erikson, A., Fridlund, M., Gondoin, P., Jorda, L., Lammer, H., Léger, A., Llebaria, A., Magain, P., Moutou, C., Ollivier, M., Pätzold, M., Pont, F., Queloz, D., Rauer, H., Rouan, D., Sabo, R., Schneider, J., and Wuchterl, G.
- Abstract
This paper presents an analysis that searched for systematic effects within the CoRoT exoplanet field light curves. The analysis identified a systematic effect that modified the zero point of most CoRoT exposures as a function of stellar magnitude. We could find this effect only after preparing a set of learning light curves that were relatively free of stellar and instrumental noise. Correcting for this effect, rejecting outliers that appear in almost every exposure, and applying SysRem, reduced the stellar RMS by about 20%, without attenuating transit signals.
- Published
- 2009
- Full Text
- View/download PDF
4. The secondary eclipse of CoRoT-1b*
- Author
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Alonso, R., Alapini, A., Aigrain, S., Auvergne, M., Baglin, A., Barbieri, M., Barge, P., Bonomo, A. S., Bordé, P., Bouchy, F., Chaintreuil, S., De la Reza, R., Deeg, H. J., Deleuil, M., Dvorak, R., Erikson, A., Fridlund, M., De Oliveira Fialho, F., Gondoin, P., Guillot, T., Hatzes, A., Jorda, L., Lammer, H., Léger, A., Llebaria, A., Magain, P., Mazeh, T., Moutou, C., Ollivier, M., Pätzold, M., Pont, F., Queloz, D., Rauer, H., Rouan, D., Schneider, J., Wuchterl, G., Alonso, R., Alapini, A., Aigrain, S., Auvergne, M., Baglin, A., Barbieri, M., Barge, P., Bonomo, A. S., Bordé, P., Bouchy, F., Chaintreuil, S., De la Reza, R., Deeg, H. J., Deleuil, M., Dvorak, R., Erikson, A., Fridlund, M., De Oliveira Fialho, F., Gondoin, P., Guillot, T., Hatzes, A., Jorda, L., Lammer, H., Léger, A., Llebaria, A., Magain, P., Mazeh, T., Moutou, C., Ollivier, M., Pätzold, M., Pont, F., Queloz, D., Rauer, H., Rouan, D., Schneider, J., and Wuchterl, G.
- Abstract
The transiting planet CoRoT-1b is thought to belong to the pM-class of planets, in which the thermal emission dominates in the optical wavelengths. We present a detection of its secondary eclipse in the CoRoT white channel data, whose response function goes from ~400 to ~1000 nm. We used two different filtering approaches, and several methods to evaluate the significance of a detection of the secondary eclipse. We detect a secondary eclipse centered within 20 min at the expected times for a circular orbit, with a depth of $0.016 \pm 0.006$%. The center of the eclipse is translated in a 1-σupper limit to the planet's eccentricity of $e\cos\omega< 0.014$. Under the assumption of a zero Bond Albedo and blackbody emission from the planet, it corresponds to a $T_{\rm CoRoT} = 2330^{+120}_{-140}$K. We provide the equilibrium temperatures of the planet as a function of the amount of reflected light. If the planet is in thermal equilibrium with the incident flux from the star, our results imply an inefficient transport mechanism of the flux from the day to the night sides.
- Published
- 2009
- Full Text
- View/download PDF
5. Noise properties of the CoRoT data*
- Author
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Aigrain, S., Pont, F., Fressin, F., Alapini, A., Alonso, R., Auvergne, M., Barbieri, M., Barge, P., Bordé, P., Bouchy, F., Deeg, H., De la Reza, R., Deleuil, M., Dvorak, R., Erikson, A., Fridlund, M., Gondoin, P., Guterman, P., Jorda, L., Lammer, H., Léger, A., Llebaria, A., Magain, P., Mazeh, T., Moutou, C., Ollivier, M., Pätzold, M., Queloz, D., Rauer, H., Rouan, D., Schneider, J., Wuchter, G., Zucker, S., Aigrain, S., Pont, F., Fressin, F., Alapini, A., Alonso, R., Auvergne, M., Barbieri, M., Barge, P., Bordé, P., Bouchy, F., Deeg, H., De la Reza, R., Deleuil, M., Dvorak, R., Erikson, A., Fridlund, M., Gondoin, P., Guterman, P., Jorda, L., Lammer, H., Léger, A., Llebaria, A., Magain, P., Mazeh, T., Moutou, C., Ollivier, M., Pätzold, M., Queloz, D., Rauer, H., Rouan, D., Schneider, J., Wuchter, G., and Zucker, S.
- Abstract
In this short paper, we study the photometric precision of stellar light curves obtained by the CoRoT satellite in its planet-finding channel, with a particular emphasis on the time scales characteristic of planetary transits. Together with other articles in the same issue of this journal, it forms an attempt to provide the building blocks for a statistical interpretation of the CoRoT planet and eclipsing binary catch to date. After pre-processing the light curves so as to minimise long-term variations and outliers, we measure the scatter of the light curves in the first three CoRoT runs lasting more than 1 month, using an iterative non-linear filter to isolate signal on the time scales of interest. The behaviour of the noise on 2 h time scales is described well by a power-law with index 0.25 in R-magnitude, ranging from 0.1 mmag at $R=11.5$to 1 mmag at $R=16$, which is close to the pre-launch specification, though still a factor 2-3 above the photon noise due to residual jitter noise and hot pixel events. There is evidence of slight degradation in the performance over time. We find clear evidence of enhanced variability on hour time scales (at the level of 0.5 mmag) in stars identified as likely giants from their Rmagnitude and $B-V$colour, which represent approximately 60 and 20% of the observed population in the directions of Aquila and Monoceros, respectively. On the other hand, median correlated noise levels over 2 h for dwarf stars are extremely low, reaching 0.05 mmag at the bright end.
- Published
- 2009
- Full Text
- View/download PDF
6. Planetary transit candidates in CoRoT-LRc01 field *
- Author
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Cabrera, J., Fridlund, M., Ollivier, M., Gandolfi, D., Csizmadia, Sz., Alonso, R., Aigrain, S., Alapini, A., Almenara, J.-M., Barge, P., Bonomo, A. S., Bordé, P., Bouchy, F., Bruntt, H., Carone, L., Carpano, S., Deeg, H. J., De la Reza, R., Deleuil, M., Dvorak, R., Erikson, A., Gillon, M., Gondoin, P., Guenther, E. W., Guillot, T., Hartmann, M., Hatzes, A., Hebrard, G., Jorda, L., Lammer, H., Léger, A., Llebaria, A., Lovis, C., Magain, P., Mayor, M., Mazeh, T., Moutou, C., Ofir, A., Pätzold, M., Pepe, F., Pont, F., Queloz, D., Rabus, M., Rauer, H., Régulo, C., Renner, S., Rouan, D., Samuel, B., Santerne, A., Schneider, J., Shporer, A., Stecklum, B., Tingley, B., Udry, S., Wuchterl, G., Cabrera, J., Fridlund, M., Ollivier, M., Gandolfi, D., Csizmadia, Sz., Alonso, R., Aigrain, S., Alapini, A., Almenara, J.-M., Barge, P., Bonomo, A. S., Bordé, P., Bouchy, F., Bruntt, H., Carone, L., Carpano, S., Deeg, H. J., De la Reza, R., Deleuil, M., Dvorak, R., Erikson, A., Gillon, M., Gondoin, P., Guenther, E. W., Guillot, T., Hartmann, M., Hatzes, A., Hebrard, G., Jorda, L., Lammer, H., Léger, A., Llebaria, A., Lovis, C., Magain, P., Mayor, M., Mazeh, T., Moutou, C., Ofir, A., Pätzold, M., Pepe, F., Pont, F., Queloz, D., Rabus, M., Rauer, H., Régulo, C., Renner, S., Rouan, D., Samuel, B., Santerne, A., Schneider, J., Shporer, A., Stecklum, B., Tingley, B., Udry, S., and Wuchterl, G.
- Abstract
Aims. We present here the list of planetary transit candidates detected in the first long run observed by CoRoT: LRc01, towards the galactic center in the direction of Aquila, which lasted from May to October 2007.
- Published
- 2009
- Full Text
- View/download PDF
7. Ground-based photometry of space-based transit detections: photometric follow-up of the CoRoT mission *
- Author
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Deeg, H. J., Gillon, M., Shporer, A., Rouan, D., Stecklum, B., Aigrain, S., Alapini, A., Almenara, J. M., Alonso, R., Barbieri, M., Bouchy, F., Eislöffel, J., Erikson, A., Fridlund, M., Eigmüller, P., Handler, G., Hatzes, A., Kabath, P., Lendl, M., Mazeh, T., Moutou, C., Queloz, D., Rauer, H., Rabus, M., Tingley, B., Titz, R., Deeg, H. J., Gillon, M., Shporer, A., Rouan, D., Stecklum, B., Aigrain, S., Alapini, A., Almenara, J. M., Alonso, R., Barbieri, M., Bouchy, F., Eislöffel, J., Erikson, A., Fridlund, M., Eigmüller, P., Handler, G., Hatzes, A., Kabath, P., Lendl, M., Mazeh, T., Moutou, C., Queloz, D., Rauer, H., Rabus, M., Tingley, B., and Titz, R.
- Abstract
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'êtrearises 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.
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- 2009
- Full Text
- View/download PDF
8. The secondary eclipse of the transiting exoplanet CoRoT-2b
- Author
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Alonso, R., Guillot, T., Mazeh, T., Aigrain, S., Alapini, A., Barge, P., Hatzes, A., and Pont, F.
- Abstract
We present a study of the light curve of the transiting exoplanet CoRoT-2b, aimed at detecting the secondary eclipse and measuring its depth. The data were obtained with the CoRoT satellite during its first run of more than 140?days. After filtering the low frequencies with a pre-whitening technique, we detect a 0.0060?0.0020% secondary eclipse centered on the orbital phase 0.494?0.006. Assuming a black-body emission of the planet, we estimate a surface brightness temperature of Tp,CoRoT=1910+90-100?K. We provide the planet's equilibrium temperature and re-distribution factors as a function of the unknown amount of reflected light. The upper limit for the geometric albedo is?0.12. The detected secondary is the shallowest ever found.
- Published
- 2009
9. Characterization of the ternary compounds AgGaTe2and AgGa5Te8
- Author
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Julien, C., Ivanov, I., Khelfa, A., Alapini, F., and Guittard, M.
- Abstract
Optical and electrical properties of ternary compounds in the Ag-Ga-Te system are reported. Vibrational properties of AgGaTe2and AgGa5Te8single crystals were studied using Raman scattering and infrared absorption spectroscopy. Long-wavelength spectra are analysed and the symmetry of lattice modes are reported. The semiconducting character of Ag-Ga-Te compounds is confirmed by conductivity measurements.
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- 1996
- Full Text
- View/download PDF
10. Transiting exoplanets from the CoRoT space mission*
- Author
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Fridlund, M., Hébrard, G., Alonso, R., Deleuil, M., Gandolfi, D., Gillon, M., Bruntt, H., Alapini, A., Csizmadia, Sz., Guillot, T., Lammer, H., Aigrain, S., Almenara, J. M., Auvergne, M., Baglin, A., Barge, P., Bordé, P., Bouchy, F., Cabrera, J., Carone, L., Carpano, S., Deeg, H. J., De la Reza, R., Dvorak, R., Erikson, A., Ferraz-Mello, S., Guenther, E., Gondoin, P., den Hartog, R., Hatzes, A., Jorda, L., Léger, A., Llebaria, A., Magain, P., Mazeh, T., Moutou, C., Ollivier, M., Pätzold, M., Queloz, D., Rauer, H., Rouan, D., Samuel, B., Schneider, J., Shporer, A., Stecklum, B., Tingley, B., Weingrill, J., and Wuchterl, G.
- Abstract
The CoRoT satellite exoplanetary team announces its sixth transiting planet in this paper. We describe and discuss the satellite observations as well as the complementary ground-based observations – photometric and spectroscopic – carried out to assess the planetary nature of the object and determine its specific physical parameters. The discovery reported here is a “hot Jupiter” planet in an 8.9d orbit, 18 stellar radii, or 0.08 AU, away from its primary star, which is a solar-type star (F9V) with an estimated age of 3.0 Gyr. The planet mass is close to 3 times that of Jupiter. The star has a metallicity of 0.2 dex lowerthan the Sun, and a relatively high 7Li abundance. While the light curve indicates a much higher level of activity than, e.g., the Sun, there is no sign of activity spectroscopically in e.g., the [Ca ii] H&K lines.
- Published
- 2010
11. An effective temperature calibration for solar type stars using equivalent width ratios*
- Author
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Sousa, S. G., Alapini, A., Israelian, G., and Santos, N. C.
- Abstract
Aims. Precise determination of the stellar effective temperature of solar type stars is extremely important for astrophysics. We present an effective temperature calibration for FGK dwarf stars using the line equivalent width ratios of spectral absorption lines.Methods. We used the automatic code ARES to measure the equivalent width for several spectral lines. These measurements were used for calibration with the precise effective temperature derived from spectroscopy presented in a previous work.Results. We present the effective temperature calibration for 433 line equivalent width ratios built from 171 spectral lines of different chemical elements. We also make a free code available that uses this calibration and that can be an extension to ARES for fast and automatic estimation of spectroscopic effective temperature of solar type stars.
- Published
- 2010
12. The secondary eclipse of the transiting exoplanet CoRoT-2b*(Corrigendum)
- Author
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Alonso, R., Guillot, T., Mazeh, T., Aigrain, S., Alapini, A., Barge, P., Hatzes, A., and Pont, F.
- Published
- 2010
13. The secondary eclipse of the transiting exoplanet CoRoT-2b (Corrigendum)*
- Author
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Alonso, R., Guillot, T., Mazeh, T., Aigrain, S., Alapini, A., Barge, P., Hatzes, A., and Pont, F.
- Published
- 2010
- Full Text
- View/download PDF
14. Transiting exoplanets from the CoRoT space mission*
- Author
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Fridlund, M., Hébrard, G., Alonso, R., Deleuil, M., Gandolfi, D., Gillon, M., Bruntt, H., Alapini, A., Csizmadia, Sz., Guillot, T., Lammer, H., Aigrain, S., Almenara, J. M., Auvergne, M., Baglin, A., Barge, P., Bordé, P., Bouchy, F., Cabrera, J., Carone, L., Carpano, S., Deeg, H. J., De la Reza, R., Dvorak, R., Erikson, A., Ferraz-Mello, S., Guenther, E., Gondoin, P., den Hartog, R., Hatzes, A., Jorda, L., Léger, A., Llebaria, A., Magain, P., Mazeh, T., Moutou, C., Ollivier, M., Pätzold, M., Queloz, D., Rauer, H., Rouan, D., Samuel, B., Schneider, J., Shporer, A., Stecklum, B., Tingley, B., Weingrill, J., and Wuchterl, G.
- Abstract
The CoRoT satellite exoplanetary team announces its sixth transiting planet in this paper. We describe and discuss the satellite observations as well as the complementary ground-based observations – photometric and spectroscopic – carried out to assess the planetary nature of the object and determine its specific physical parameters. The discovery reported here is a “hot Jupiter” planet in an 8.9d orbit, 18 stellar radii, or 0.08 AU, away from its primary star, which is a solar-type star (F9V) with an estimated age of 3.0 Gyr. The planet mass is close to 3 times that of Jupiter. The star has a metallicity of 0.2 dex lowerthan the Sun, and a relatively high 7Li abundance. While the light curve indicates a much higher level of activity than, e.g., the Sun, there is no sign of activity spectroscopically in e.g., the [Ca ii] H&K lines.
- Published
- 2010
- Full Text
- View/download PDF
15. An effective temperature calibration for solar type stars using equivalent width ratios*
- Author
-
Sousa, S. G., Alapini, A., Israelian, G., and Santos, N. C.
- Abstract
Aims. Precise determination of the stellar effective temperature of solar type stars is extremely important for astrophysics. We present an effective temperature calibration for FGK dwarf stars using the line equivalent width ratios of spectral absorption lines.
- Published
- 2010
- Full Text
- View/download PDF
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