Noise properties of the CoRoT data A planet-finding perspective

被引：42

作者：

Aigrain, S. ^{[1
]}

Pont, F. ^{[1
]}

Fressin, F. ^{[2
]}

Alapini, A. ^{[1
]}

Alonso, R. ^{[3
]}

Auvergne, M. ^{[4
]}

Barbieri, M. ^{[3
]}

Barge, P. ^{[3
]}

Borde, P. ^{[5
]}

Bouchy, F. ^{[6
]}

Deeg, H. ^{[7
]}

De la Reza, R. ^{[8
]}

Deleuil, M. ^{[3
]}

Dvorak, R. ^{[9
]}

Erikson, A. ^{[10
]}

Fridlund, M. ^{[11
]}

Gondoin, P. ^{[11
]}

Guterman, P. ^{[3
]}

Jorda, L. ^{[3
]}

Lammer, H. ^{[12
]}

Leger, A. ^{[5
]}

Llebaria, A. ^{[3
]}

Magain, P. ^{[13
]}

Mazeh, T. ^{[14
]}

Moutou, C. ^{[3
]}

Ollivier, M. ^{[5
]}

Paetzold, M. ^{[15
]}

Queloz, D. ^{[16
]}

Rauer, H. ^{[10
,17
]}

Rouan, D. ^{[4
]}

Schneider, J. ^{[18
]}

Wuchter, G. ^{[19
]}

Zucker, S. ^{[20
]}

机构：

[1] Univ Exeter, Sch Phys, Exeter EX4 4QL, Devon, England

[2] Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA

[3] Univ Aix Marseille 1, LAM, F-13388 Marseille, France

[4] Observ Paris, LESIA, F-92195 Meudon, France

[5] Univ Paris 11, IAS, F-91405 Orsay, France

[6] Observ Haute Provence, F-04870 St Michel lObservatoire, France

[7] IAC, San Cristobal la Laguna 38205, Spain

[8] ON MCT, BR-20921030 Rio De Janeiro, Brazil

[9] Univ Vienna, IfA, A-1180 Vienna, Austria

[10] DLR, Inst Planetary Res, D-12489 Berlin, Germany

[11] Estec, ESA, RSSD, NL-2200 Noordwijk, Netherlands

[12] Austrian Acad Sci, IWF, A-8042 Graz, Austria

[13] Univ Liege, IAG, Liege 1, Belgium

[14] Tel Aviv Univ, Sch Phys & Astron, IL-69978 Tel Aviv, Israel

[15] Univ Cologne, RIU, D-50931 Cologne, Germany

[16] Observ Geneva, CH-1290 Sauverny, Switzerland

[17] Tech Univ Berlin, ZAA, D-10623 Berlin, Germany

[18] Observ Paris, LUTH, F-92195 Meudon, France

[19] Thuringer Landessternwarte, D-07778 Tautenburg, Germany

[20] Tel Aviv Univ, Dept Geophys & Planetary Sci, IL-69978 Tel Aviv, Israel

来源：

ASTRONOMY & ASTROPHYSICS | 2009年 / 506卷 / 01期

基金：

以色列科学基金会;

关键词：

methods: data analysis; techniques: photometric; stars: planetary systems; STELLAR MICROVARIABILITY;

D O I：

10.1051/0004-6361/200911885

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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 R magnitude 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.

引用

页码：425 / 429

页数：5

共 12 条

[1] Practical planet prospecting [J].

Aigrain, S ;

Irwin, M .

MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY, 2004, 350 (01) :331-345

[2] Characterising stellar micro-variability for planetary transit searches [J].

Aigrain, S ;

Favata, F ;

Gilmore, G .

ASTRONOMY & ASTROPHYSICS, 2004, 414 (03) :1139-1152

[3]

Auvergne M., 2003, Proceedings of the SPIE - The International Society for Optical Engineering, V4854, P170, DOI 10.1117/12.459806

[4] The CoRoT satellite in flight: description and performance [J].

Auvergne, M. ;

Bodin, P. ;

Boisnard, L. ;

Buey, J. -T. ;

Chaintreuil, S. ;

Epstein, G. ;

Jouret, M. ;

Lam-Trong, T. ;

Levacher, P. ;

Magnan, A. ;

Perez, R. ;

Plasson, P. ;

Plesseria, J. ;

Peter, G. ;

Steller, M. ;

Tiphene, D. ;

Baglin, A. ;

Agogue, P. ;

Appourchaux, T. ;

Barbet, D. ;

Beaufort, T. ;

Bellenger, R. ;

Berlin, R. ;

Bernardi, P. ;

Blouin, D. ;

Boumier, P. ;

Bonneau, F. ;

Briet, R. ;

Butler, B. ;

Cautain, R. ;

Chiavassa, F. ;

Costes, V. ;

Cuvilho, J. ;

Cunha-Parro, V. ;

Fialho, F. De Oliveira ;

Decaudin, M. ;

Defise, J. -M. ;

Djalal, S. ;

Docclo, A. ;

Drummond, R. ;

Dupuis, O. ;

Exil, G. ;

Faure, C. ;

Gaboriaud, A. ;

Gamet, P. ;

Gavalda, P. ;

Grolleau, E. ;

Gueguen, L. ;

Guivarc'h, V. ;

Guterman, P. .

ASTRONOMY & ASTROPHYSICS, 2009, 506 (01) :411-424

[5]

da Silva LP, 2008, MON NOT R ASTRON SOC, V384, P1337, DOI [10.1111/j.1365-2966.2007.12800.x, 10.1111/J.1365-2966.2007.12800.x]

[6]

FREYTAG B, 2001, ASP C SER, V223, P785

[7]

Hoaglin D. C., 1983, Understanding robust and exploratory data analysis

[8]

KALLINGER T, 2009, A A UNPUB

[9] Removing systematics from the CoRoT light curves I. Magnitude-dependent zero point [J].

Mazeh, T. ;

Guterman, P. ;

Aigrain, S. ;

Zucker, S. ;

Grinberg, N. ;

Alapini, A. ;

Alonso, R. ;

Auvergne, M. ;

Barbieri, M. ;

Barge, P. ;

Borde, P. ;

Bouchy, F. ;

Deeg, H. ;

De la Reza, R. ;

Deleuil, M. ;

Dvorak, R. ;

Erikson, A. ;

Fridlund, M. ;

Gondoin, P. ;

Jorda, L. ;

Lammer, H. ;

Leger, A. ;

Llebaria, A. ;

Magain, P. ;

Moutou, C. ;

Ollivier, M. ;

Paetzold, M. ;

Pont, F. ;

Queloz, D. ;

Rauer, H. ;

Rouan, D. ;

Sabo, R. ;

Schneider, J. ;

Wuchterl, G. .

ASTRONOMY & ASTROPHYSICS, 2009, 506 (01) :431-434

[10] Planetary transit candidates in the CoRoT initial run: resolving their nature [J].

Moutou, C. ;

Pont, F. ;

Bouchy, F. ;

Deleuil, M. ;

Almenara, J. M. ;

Alonso, R. ;

Barbieri, M. ;

Bruntt, H. ;

Deeg, H. J. ;

Fridlund, M. ;

Gandolfi, D. ;

Gillon, M. ;

Guenther, E. ;

Hatzes, A. ;

Hebrard, G. ;

Loeillet, B. ;

Mayor, M. ;

Mazeh, T. ;

Queloz, D. ;

Rabus, M. ;

Rouan, D. ;

Shporer, A. ;

Udry, S. ;

Aigrain, S. ;

Auvergne, M. ;

Baglin, A. ;

Barge, P. ;

Benz, W. ;

Borde, P. ;

Carpano, S. ;

De la Reza, R. ;

Dvorak, R. ;

Erikson, A. ;

Gondoin, P. ;

Guillot, T. ;

Jorda, L. ;

Kabath, P. ;

Lammer, H. ;

Leger, A. ;

Llebaria, A. ;

Lovis, C. ;

Magain, P. ;

Ollivier, M. ;

Paetzold, M. ;

Pepe, F. ;

Rauer, H. ;

Schneider, J. ;

Wuchterl, G. .

ASTRONOMY & ASTROPHYSICS, 2009, 506 (01) :321-336

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