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RE: Corot Space Telescope
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The CoRoT space mission: early results

# Editorial p. E1
C. Bertout,  T. Forveille,  N. Langer, and  S. Shore
PDF file (25.59 KB) | PS file (11.26 KB)


# On posterior probability and significance level: application to the power spectrum of HD 49933 observed by CoRoT p. 1
T. Appourchaux, R. Samadi, and M.-A. Dupret
Abstract | PDF file (206.0 KB) | PS file (79.01 KB)


# Mode width fitting with a simple Bayesian approach - Application to CoRoT targets HD 181420 and HD 49933 p. 7
P. Gaulme, T. Appourchaux, and P. Boumier
Abstract | PDF file (515.4 KB) | PS file (257.4 KB)


# The solar-like oscillations of HD49933: a Bayesian approach p. 15
O. Benomar, T. Appourchaux, and F. Baudin
Abstract | PDF file (994.8 KB) | PS file (342.5 KB)


# The CoRoT target HD175726: an active star with weak solar-like oscillations p. 33
B. Mosser, E. Michel, T. Appourchaux, C. Barban, F. Baudin, P. Boumier, H. Bruntt, C. Catala, S. Deheuvels, R. A. García, P. Gaulme, C. Regulo, I. Roxburgh, R. Samadi, G. Verner, M. Auvergne, A. Baglin, J. Ballot, O. Benomar, and S. Mathur
Abstract | PDF file (996.3 KB) | PS file (534.2 KB)


# Solar-like oscillations with low amplitude in the CoRoT target HD 181906 p. 41
R. A. García, C. Régulo, R. Samadi, J. Ballot, C. Barban, O. Benomar, W. J. Chaplin, P. Gaulme, T. Appourchaux, S. Mathur, B. Mosser, T. Toutain, G. A. Verner, M. Auvergne, A. Baglin, F. Baudin, P. Boumier, H. Bruntt, C. Catala, S. Deheuvels, Y. Elsworth, S. J. Jiménez-Reyes, E. Michel, F. Pérez Hernández, I. W. Roxburgh, and D. Salabert
Abstract | PDF file (2.302 MB) | PS file (4.834 MB)


# Solar-like oscillations in HD 181420: data analysis of 156 days of CoRoT data p. 51
C. Barban, S. Deheuvels, F. Baudin, T. Appourchaux, M. Auvergne, J. Ballot, P. Boumier, W. J. Chaplin, R. A. García, P. Gaulme, E. Michel, B. Mosser, C. Régulo, I. W. Roxburgh, G. Verner, A. Baglin, C. Catala, R. Samadi, H. Bruntt, Y. Elsworth, and S. Mathur
Abstract | PDF file (1.445 MB) | PS file (1.121 MB)


# Theoretical amplitudes and lifetimes of non-radial solar-like oscillations in red giants p. 57
M.-A. Dupret, K. Belkacem, R. Samadi, J. Montalban, O. Moreira, A. Miglio, M. Godart, P. Ventura, H.-G. Ludwig, A. Grigahcène, M.-J. Goupil, A. Noels, and E. Caffau
Abstract | PDF file (521.9 KB) | PS file (1.148 MB)


# Looking for pulsations in HgMn stars through CoRoT lightcurves p. 69
G. Alecian, M. Gebran, M. Auvergne, O. Richard, R. Samadi, W. W. Weiss, and A. Baglin
Abstract | PDF file (595.8 KB) | PS file (1.312 MB)


# Asteroseismic analysis of the CoRoT $\delta$ Scuti star HD174936 p. 79
A. García Hernández, A. Moya, E. Michel, R. Garrido, J. C. Suárez, E. Rodríguez, P. J. Amado, S. Martín-Ruiz, A. Rolland, E. Poretti, R. Samadi, A. Baglin, M. Auvergne, C. Catala, L. Lefevre, and F. Baudin
Abstract | PDF file (484.0 KB) | PS file (1.807 MB)


# HD 50844: a new look at $\delta$ Scuti stars from CoRoT space photometry p. 85
E. Poretti, E. Michel, R. Garrido, L. Lefèvre, L. Mantegazza, M. Rainer, E. Rodríguez, K. Uytterhoeven, P. J. Amado, S. Martín-Ruiz, A. Moya, E. Niemczura, J. C. Suárez, W. Zima, A. Baglin, M. Auvergne, F. Baudin, C. Catala, R. Samadi, M. Alvarez, P. Mathias, M. Paparò, P. Pápics, and E. Plachy
Abstract | PDF file (787.8 KB) | PS file (436.5 KB)


# The B0.5IVe CoRoT target HD49330 - I. Photometric analysis from CoRoT data p. 95
A.-L. Huat, A.-M. Hubert, F. Baudin, M. Floquet, C. Neiner, Y. Frémat, J. Gutiérrez-Soto, L. Andrade, B. de Batz, P. D. Diago, M. Emilio, F. Espinosa Lara, J. Fabregat, E. Janot-Pacheco, B. Leroy, C. Martayan, T. Semaan, J. Suso, M. Auvergne, C. Catala, E. Michel, and R. Samadi
Abstract | PDF file (3.456 MB) | PS file (6.482 MB)


# The B0.5 IVe CoRoT target HD 49330 - II. Spectroscopic ground-based observations p. 103
M. Floquet, A.-M. Hubert, A.-L. Huat, Y. Frémat, E. Janot-Pacheco, J. Gutiérrez-Soto, C. Neiner, B. de Batz, B. Leroy, E. Poretti, P. Amado, C. Catala, M. Rainer, D. Diaz, K. Uytterhoeven, L. Andrade, P. D. Diago, M. Emilio, F. Espinosa Lara, J. Fabregat, C. Martayan, T. Semaan, and J. Suso
Abstract | PDF file (373.1 KB) | PS file (304.2 KB)


# Evidence for nonlinear resonant mode coupling in the $\mathsf{\beta}$ Cephei star HD180642 (V1449 Aquilae) from CoRoT photometry p. 111
P. Degroote, M. Briquet, C. Catala, K. Uytterhoeven, K. Lefever, T. Morel, C. Aerts, F. Carrier, M. Auvergne, A. Baglin, and E. Michel
Abstract | PDF file (2.983 MB) | PS file (4.326 MB)


# Pulsations in the late-type Be star HD 50209 detected by CoRoT p. 125
P. D. Diago, J. Gutiérrez-Soto, M. Auvergne, J. Fabregat, A.-M. Hubert, M. Floquet, Y. Frémat, R. Garrido, L. Andrade, B. de Batz, M. Emilio, F. Espinosa Lara, A.-L. Huat, E. Janot-Pacheco, B. Leroy, C. Martayan, C. Neiner, T. Semaan, J. Suso, C. Catala, E. Poretti, M. Rainer, K. Uytterhoeven, E. Michel, and R. Samadi
Abstract | PDF file (1012 KB) | PS file (11.47 MB)


# Low-amplitude variations detected by CoRoTin the B8IIIe star HD 175869 p. 133
J. Gutiérrez-Soto, M. Floquet, R. Samadi, C. Neiner, R. Garrido, J. Fabregat, Y. Frémat, P. D. Diago, A.-L. Huat, B. Leroy, M. Emilio, A.-M. Hubert, O. Thizy L. Andrade, B. de Batz, E. Janot-Pacheco, F. Espinosa Lara, C. Martayan, T. Semaan, J. Suso, M. Auvergne, S. Chaintreuil, E. Michel, and C. Catala
Abstract | PDF file (952.5 KB) | PS file (1.633 MB)


# The pulsations of the B5IVe star HD181231 observed with CoRoT and ground-based spectroscopy p. 143
C. Neiner, J. Gutiérrez-Soto, F. Baudin, B. de Batz, Y. Frémat, A. L. Huat, M. Floquet, A.-M. Hubert, B. Leroy, P. D. Diago, E. Poretti, F. Carrier, M. Rainer, C. Catala, O. Thizy, C. Buil, J. Ribeiro, L. Andrade, M. Emilio, F. Espinosa Lara, J. Fabregat, E. Janot-Pacheco, C. Martayan, T. Semaan, J. Suso, A. Baglin, E. Michel, and R. Samadi
Abstract | PDF file (1.186 MB) | PS file (2.764 MB)


# Accuracy of stellar parameters of exoplanet-host stars determined from asteroseismology p. 153
C. Mulet-Marquis, I. Baraffe, S. Aigrain, and F. Pont
Abstract | PDF file (250.4 KB) | PS file (72.38 KB)


# HD 51106 and HD 50747: an ellipsoidal binary and a triple system observed with CoRoT p. 159
N. Dolez, S. Vauclair, E. Michel, A. Hui-Bon-Hoa, G. Vauclair, D. Le Contel, P. Mathias, E. Poretti, P. J. Amado, M. Rainer, R. Samadi, A. Baglin, C. Catala, M. Auvergne, K. Uytterhoeven, and J.-C. Valtier
Abstract | PDF file (182.6 KB) | PS file (180.4 KB)


# Hydrodynamical simulations of convection-related stellar micro-variability - II. The enigmatic granulation background of the CoRoT target HD49933 p. 167
H.-G. Ludwig, R. Samadi, M. Steffen, T. Appourchaux, F. Baudin, K. Belkacem, P. Boumier, M.-J. Goupil, and E. Michel
Abstract | PDF file (1.414 MB) | PS file (1.199 MB)


# Impact of the physical processes in the modeling of HD49933 p. 175
L. Piau, S. Turck-Chièze, V. Duez, and R. F. Stein
Abstract | PDF file (165.4 KB) | PS file (73.22 KB)


# Mode identification in rapidly rotating stars p. 183
D. R. Reese, M. J. Thompson, K. B. MacGregor, S. Jackson, A. Skumanich, and T. S. Metcalfe
Abstract | PDF file (471.0 KB) | PS file (266.7 KB)


# Pulsation modes in rapidly rotating stellar models based on the self-consistent field method p. 189
D. R. Reese, K. B. MacGregor, S. Jackson, A. Skumanich, and T. S. Metcalfe
Abstract | PDF file (4.447 MB) | PS file (4.520 MB)


# Improved fundamental parameters and LTE abundances of the CoRoT solar-type pulsator HD 49933 p. 203
T. Ryabchikova, L. Fossati, and D. Shulyak
Abstract | PDF file (418.8 KB)

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COROT
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Title: Planetary transit candidates in COROT-IRa01 field
Authors: S. Carpano, J. Cabrera, R. Alonso, P. Barge, S. Aigrain, J.-M. Almenara, P. Bordé, F. Bouchy, L. Carone, H. J. Deeg, R. De la Reza, M. Deleuil, R. Dvorak, A. Erikson, F. Fressin, M. Fridlund, P. Gondoin, T. Guillot, A. Hatzes, L. Jorda, H. Lammer, A. Léger, A. Llebaria, P. Magain, C. Moutou, A. Ofir, M. Ollivier, E. J. Pacheco, M. Pátzold, F. Pont, D. Queloz, H. Rauer, C. Régulo, S. Renner, D. Rouan, B. Samuel, J. Schneider, G. Wuchterl

Context: CoRoT is a pioneering space mission devoted to the analysis of stellar variability and the photometric detection of extrasolar planets.
Aims: We present the list of planetary transit candidates detected in the first field observed by CoRoT, IRa01, the initial run toward the Galactic anticenter, which lasted for 60 days.
Methods: We analysed 3898 sources in the coloured bands and 5974 in the monochromatic band. Instrumental noise and stellar variability were taken into account using detrending tools before applying various transit search algorithms.
Results: Fifty sources were classified as planetary transit candidates and the most reliable 40 detections were declared targets for follow-up ground-based observations. Two of these targets have so far been confirmed as planets, COROT-1b and COROT-4b, for which a complete characterization and specific studies were performed.

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The CoRoT satellite
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Title: The CoRoT satellite in flight : description and performance
Authors: M. Auvergne, P. Bodin, L. Boisnard, J.-T Buey, S. Chaintreuil, CoRoT team

CoRoT is a space telescope dedicated to stellar seismology and the search for extrasolar planets. The mission is led by CNES in association with French laboratories and has a large international participation: the European Space Agency (ESA), Austria, Belgium and Germany contribute to the payload, and Spain and Brazil contribute to the ground segment. Development of the spacecraft, which is based on a PROTEUS low earth orbit recurrent platform, commenced in October 2000 and the satellite was launched on December 27th 2006.
The instrument and platform characteristics prior to launch have been described in ESA publication (SP-1306) . In the present paper we detail the behaviour in flight, based on raw and corrected data. Five runs have been completed since January 2007. The data used here are essentially those acquired during the commissioning phase and from a long run which lasted 146 days, these enable us to give a complete overview of the instrument and platform behaviour for all environmental conditions. The ground based data processing is not described in detail, the most important method being published elsewhere. It is shown that the performance specifications are easily satisfied when the environmental conditions are favourable. Most of the perturbations, and consequently data corrections, are related to Low Earth Orbit (LEO) perturbations: high energy particles inside the South Atlantic Anomaly (SAA), eclipses and temperature variations, and line of sight fluctuations due to the attitude control system. Stray light due to the reflected light from the earth, which is controlled by the telescope and baffle design, appears to be negligible.

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RE: Corot Space Telescope
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The space-borne telescope, COROT (Convection, Rotation and planetary Transits), has just completed its first year in orbit. The observatory has brought in surprises after over 300 days of scientific observations.
Pioneering precision measurement over long periods of time COROT is observing a large number of stars, up to 12 000, simultaneously, at a very high precision - unprecedented in ground-based astronomy. The key to the high-precision is that the observations can be carried out over very long periods of time up to 150 days. This is being done for the first time ever.
The satellite measures variations in the light output of these stars down to one part in a million. This level of precision allows scientists to study the many ways in which stars vary. The pulsations are caused either due to unknown physical processes in the stellar interior, or by objects such as planets passing in front of the stellar surface.

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CoRoT: 300 days in orbits.
The CoRoT satellite celebrated its 300 days in orbit, since its launch from the Baïkonour cosmodrome on December 27, 2006. The satellite has just completed its first long sequence of observation (150 days) towards the galactic centre and was turned over towards the anti-centre, in order to turn its back to Sun on October 15. After the operations, it started its second long sequence of observation on October 23. This one should continue until next March.
Since the beginning of its mission, CoRoT observed 3 carefully selected areas of the sky:

* an area in the direction of the constellation of Monoceros (Unicorn) for 60 days,
* followed by a short period (26 days) and a long period (150 days) of pointings in the opposed direction, towards the constellation of Serpens Cauda (snakes tail).

CoRoT obtains "light curves", i.e. it measured the light emitted by many stars with an unequalled precision and duration. During each series of observations, more than 12 000 lightcurves were obtained, with practically uninterrupted data.

lightcurve_e1
Expand (12kb, 750 x 461)
This is an example for illustration. The data covers a 120 days period of uninterrupted observation.
Credit CNRS

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Title: The CoRoT primary target HD 52265: models and seismic tests
Authors: M. Soriano, S. Vauclair, C. Vauclair, M. Laymand

HD 52265 is the only known exoplanet-host star selected as a main target for the seismology programme of the CoRoT satellite. As such, it will be observed continuously during five months, which is of particular interest in the framework of planetary systems studies. This star was misclassified as a giant in the Bright Star Catalogue, while it is more probably on the main-sequence or at the beginning of the subgiant branch. We performed an extensive analysis of this star, showing how asteroseismology may lead to a precise determination of its external parameters and internal structure. We first reviewed the observational constraints on the metallicity, the gravity and the effective temperature derived from the spectroscopic observations of HD 52265. We also derived its luminosity using the Hipparcos parallax. We computed the evolutionary tracks for models of various metallicities which cross the relevant observational error boxes in the gravity-effective temperature plane. We selected eight different stellar models which satisfy the observational constraints, computed their p-modes frequencies and analysed specific seismic tests. The possible models for HD 52265, which satisfy the constraints derived from the spectroscopic observations, are different in both their external and internal parameters. They lie either on the main sequence or at the beginning of the subgiant branch. The differences in the models lead to quite different properties of their oscillation frequencies. We give evidences of an interesting specific behaviour of these frequencies in case of helium-rich cores: the ''small separations'' may become negative and give constraints on the size of the core. We expect that the observations of this star by the CoRoT satellite wi ll allow choosing between these possible models.

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COROT-Exo-1b
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COROT has provided its first image of a giant planet orbiting another star and the first bit of seismic information on a far away, Sun-like star- with unexpected accuracy.
 The unanticipated level of accuracy of this raw data shows that COROT will be able to see rocky planets - perhaps even as small as Earth - and possibly provide an indication of their chemical composition.
COROT, a CNES project with ESA participation, is a mission with a dual goal. It is the first space mission dedicated entirely to the search of extra-solar planets. It provides a wide-field survey of planets like our own at an unprecedented level of accuracy. It is also making the most comprehensive study ever of the interior of stars other than our Sun. Both objectives are achieved by analysing the behaviour of light emitted by a target star.
An exoplanet is detected by COROT due to a sudden decrease in the intensity of light or the light curve of a parent star when a planet transits in front of it.

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RE: Corot Space Telescope
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The Corot space telescope started its first observing run, on 3 February 2007
After analysis and characterization of the first images of the exoplanet channel, the Corot instrument was switched to the scientific observing mode for a 2-month period of time, until 2 April.
Saturating magnitude, focus and chromatic dispersion, line of sight modelling : all the parameters are nominal or compliant with adjustment precision.
Three days of operations have been devoted to generate and check with care the set of aperture masks uploaded to calculate on board the light curves of the 12 000 stars selected.
These light curves will be subsequently corrected from the instrument noises, and be distributed to the scientific community as level-1 products.
It will take several weeks to accurately isolate these noises and optimise the correction algorithms. The Corot labs are already at work....

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Brazil has received data transmitted from satellite Corot, which was launched to look for new Earth-like planets beyond the solar system and to explore the interior of stars, said Brazil's National Institute of Space Research (INPE) on Wednesday.

"We have been receiving data since Jan. 12" - Pawel Rozenfeld, head of the INPE's Satellite Track and Control Centre.

He described the satellite's performance in orbit as "excellent." Every 12 hours, the satellite is tracked by a station which is located in Northeastern Brazil, and the data obtained are first transferred to Sao Paulo and then to France's Toulouse, the Corot project's headquarters.

Source: Xinhua

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