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The science of EChO


The science of extra-solar planets is one of the most rapidly changing areas of astrophysics and since 1995 the number of planets known has increased by almost two orders of magnitude. A combination of ground-based surveys and dedicated space missions has resulted in 560-plus planets being detected, and over 1200 that await confirmation. NASA's Kepler mission has opened up the possibility of discovering Earth-like planets in the habitable zone around some of the 100,000 stars it is surveying during its 3 to 4-year lifetime. The new ESA's Gaia mission is expected to discover thousands of new planets around stars within 200 parsecs of the Sun. The key challenge now is moving on from discovery, important though that remains, to characterisation: what are these planets actually like, and why are they as they are?

In the past ten years, we have learned how to obtain the first spectra of exoplanets using transit transmission and emission spectroscopy. With the high stability of Spitzer, Hubble, and large ground-based telescopes the spectra of bright close-in massive planets can be obtained and species like water vapour, methane, carbon monoxide and dioxide have been detected. With transit science came the first tangible remote sensing of these planetary bodies and so one can start to extrapolate from what has been learnt from Solar System probes to what one might plan to learn about their faraway siblings. As we learn more about the atmospheres, surfaces and near-surfaces of these remote bodies, we will begin to build up a clearer picture of their construction, history and suitability for life.

The Exoplanet Characterisation Observatory, EChO, will be the first dedicated mission to investigate the physics and chemistry of Exoplanetary Atmospheres. By characterising spectroscopically more bodies in different environments we will take detailed planetology out of the Solar System and into the Galaxy as a whole.

EChO has now been selected by the European Space Agency to be assessed as one of four M3 mission candidates.



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Ábrahám, P., Juhász, A., Dullemond, C. P., Kóspál, Á., van Boekel, R., Bouwman, J., Henning, T., Moór, A., Mosoni, L., Sicilia-Aguilar, A., & Sipos, N. 2009, Nature, 459, 224
Adams, E. R., Seager, S., & Elkins-Tanton, L. 2008, ApJ, 673, 1160
Banzatti, A., Testi, L., Isella, A., Natta, A., Neri, R., & Wilner, D. J. 2011, A&A, 525, A12
Baraffe, I., Chabrier, G., & Barman, T. 2008, A&A, 482, 315
Baraffe, I., Chabrier, G., Barman, T. S., Allard, F., & Hauschildt, P. H. 2003, A&A, 402, 701
Bodenheimer, P., Lin, D. N. C., & Mardling, R. A. 2001, ApJ, 548, 466
Burrows, A., Budaj, J., & Hubeny, I. 2007, ApJ, 668, 671
Charbonneau, D., Brown, T., Latham, D., & Mayor, M. 2000, ApJ, 529, L45
Cho, J., Menou, K., Hansen, B. M. S., & Seager, S. 2003, ApJL, 587, L117
Correia, A. & Laskar, J. 2004, Nature, 429, 848
GarcíaMuñoz, A. Muñoz, A. 2007, Plan. Space Sci., 55, 1426
Grasset, O., Schneider, J., & Sotin, C. 2009, ApJ, 693, 722
Grenfell, J. L., Rauer, H., Selsis, F., Kaltenegger, L., Beichman, C., Danchi, W., Eiroa, C., Fridlund, M., Henning, T., Herbst, T., Lammer, H., Léger, A., Liseau, R., Lunine, J., Paresce, F., Penny, A., Quirrenbach, A., Röttgering, H., Schneider, J., Stam, D., Tinetti, G., & White, G. J. 2010, Astrobiology, 10, 77
Guillot, T. 2005, Annu. Rev. Earth Plan. Sci., 33, 493
Guillot, T. 2008, Physica Scripta, T130, 014023
Guillot, T. 2010, A&A, 520, A27+
Guillot, T., Santos, N. C., Pont, F., Iro, N., Melo, C., & Ribas, I. 2006, A&A, 453, L21
Guillot, T. & Showman, A. P. 2002, A&A, 385, 156
Heng, K, Menou, K, Phillipps, P. J. 2011, MNRAS, 413, 2380
Hubeny, I., Burrows, A., & Sudarsky, D. 2003, ApJ, 594, 1011
Ikoma, M., Guillot, T., Genda, H., Tanigawa, T., & Ida, S. 2006, ApJ, 650, 1150
Kipping, D. 2009 a, MNRAS, 392, 181
Kipping, D. 2009 b, MNRAS, 396, 1797
Koskinen, T., Aylward, A., & Miller, S. 2007, Nature, 450, 845
Koskinen, T., Cho, J.-K., Achilleos, N., & Aylward, A. D. 2010, ApJ, 722, 178
Léger, A., Selsis, F., Sotin, C., Guillot, T., Despois, D., Mawet, D., Ollivier, M., Labèque, A., Valette, C., Brachet, F., Chazelas, B., & Lammer, H. 2004, Icarus, 169, 499
Liang, M.-C., Parkinson, C. D., Lee, A. Y. T., Yung, Y. L., & Seager, S. 2003, ApJL, 596, 247
Liang, M.-C., Seager, S., Parkinson, C. D., Lee, A. Y. T., & Yung, Y. L. 2004, ApJL, 605, 61
Line, M. R., Liang, M. C., & Yung, Y. L. 2010, ApJ, 717, 496
Linsky, J. L., Yang, H., France, K., Froning, C. S., Green, J. C., Stocke, J. T., & Osterman, S. N. 2010, ApJ, 717, 1291
Lissauer, J. J. & Stevenson, D. J. 2007, Protostars and Planets V, 591
Lodders, K. & Fegley, B. 2002, Icarus, 155, 393
Miller, S., Stallard, T., & Smith, C., et al. 2006, Royal Society of London Transactions Series A, 364, 3121
Mordasini, C., Alibert, Y., & Benz, W. 2009, A&A, 501, 1139
Moses, J. I., Visscher, C., Fortney, J. J., Lewis, N. K., Showman, A. P., Marley, M. S., Griffith, C. A., & Friedson, A. J. 2011, ApJ, 737, id.15
Prinn, R. & Barshay, S. 1977, Science, 198, 1031
Sato, B., Fischer, D. A., Henry, G. W., Laughlin, G., Butler, R. P., Marcy, G. W., Vogt, S. S., Bodenheimer, P., Ida, S., Toyota, E., Wolf, A., Valenti, J. A., Boyd, L. J., Johnson, J. A., Wright, J. T., Ammons, M., Robinson, S., Strader, J., McCarthy, C., Tah, K. L., & Minniti, D. 2005, ApJ, 633, 465
Seager, S., Kuchner, M., Hier-Majumder, C. A., & Militzer, B. 2007, ApJ, 669, 1279
Segura, A., Kasting, J. F., Meadows, V., Cohen, M., Scalo, J., Crisp, D., Butler, R. A. H., & Tinetti, G. 2005, Astrobiology, 5, 706
Segura, A., Krelove, K., Kasting, J. F., Sommerlatt, D., Meadows, V., Crisp, D., Cohen, M., & Mlawer, E. 2003, Astrobiology, 3, 689
Segura, A., Walkowicz, L. M., Meadows, V., Kasting, J., & Hawley, S. 2010, Astrobiology, 10, 751
Selsis, F., Despois, D., & Parisot, J. 2002, A&A, 388, 985
Sotin, C., Grasset, O., & Mocquet, A. 2007, Icarus, 191, 337
Swain, M. R., Vasisht, G., Tinetti, G., Bouwman, J., Chen, P., Yung, Y., Deming, D., & Deroo, P. 2009, ApJ, 690, L114
Thrastarson, H. T. & Cho, J. 2010, ApJ, 716, 144
Tinetti, G., et al. 2011, Experimental Astronomy, submitted
Tsiganis, K., Gomes, R., Morbidelli, A., & Levison, H. F. 2005, Nature, 435, 459
Valencia, D., O'Connell, R. J., & Sasselov, D. 2006, Icarus, 181, 545
Valencia, D., Sasselov, D. D., & O'Connell, R. J. 2007, ApJ, 665, 1413
Vidal-Madjar, A., Désert, J., Lecavelier des Etangs, A., Hébrard, G., Ballester, G. E., Ehrenreich, D., Ferlet, R., McConnell, J. C., Mayor, M., & Parkinson, C. D. 2004, ApJL, 604, L69
Visscher, C., Lodders, K., & Fegley, B. 2006, ApJ, 648, 1181
Wordsworth, R. D., Forget, F., Selsis, F., Madeleine, J.-B., Millour, E., & Eymet, V. 2010, A&A, 522, A22
Yelle, R. V. 2004, Icarus, 170, 167
Yung, Y. L. & Demore, W. B., eds. 1999, Photochemistry of planetary atmospheres
Zahnle, K., Marley, M., Freedman, R., Lodders, K., & Fortney, J. 2009 a, ApJ, 701, L20
Zahnle, K., Marley, M. S., & Fortney, J. J. 2009 b, ApJ submitted (arXiv:0911.0728)
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