National Centre of Competence in Research PlanetS
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Project 3.6: Future upper atmospheric characterisation of exoplanets with spectroscopy (FOUR ACES)

The project FOUR ACES is led by David Ehrenreich. It is externally funded by the European Research Council through ERC Consolidator grant ERC-2016-COG: 724427 and is dedicated to the study of exoplanetery atmospheres.

This project will open a new path to characterise the atmospheres of exoplanets down to Earth-size objects, using the spatial extension of upper atmospheres as a magnifying glass to access the atmospheric properties. The tremendous energy received by exoplanets close to their stars leads to dramatic atmospheric expansion and escape, which could result in the formation of hot rocky super-Earths seen in recent years. While the escape mechanisms and evolutionary impact on planets and atmospheres remain debated, the atmospheric expansion gives rise to spectacular spectroscopic signatures in the ultra violet, only detectable with the Hubble Space Telescope (HST). The huge extended atmosphere observed escaping from a “warm Neptune” (Ehrenreich et al. 2015) represents a milestone on the road to the atmospheres of lower-mass, more temperate planets. HARPS spectroscopy from the ground also revealed the extreme conditions in the upper atmosphere of a “hot Jupiter”, probing the onset of atmospheric escape in the optical, linking the upper and lower atmospheres (Wyttenbach et al. 2015). FOUR ACES will consolidate these breakthroughs via a thorough exploitation of the vast amount of observations obtained for ~20 planets (400+ hours on HST and 300+ hours on HARPS and HARPS-N) in the wake of these results. Those data will be used to bind theories describing the lower and upper atmospheres of exoplanets, and determine how these are impacted by stellar activity. As new transit surveys will provide hundreds of exoplanets transiting bright stars, the reconnaissance capabilities of the ESA CHEOPS mission (2018–2022) will be used to cherrypick the very best ones for upper atmospheric characterisation.

credits: Mark Garlick

Authors:
Allart, R.; Bourrier, V.; Lovis, C.; Ehrenreich, D.; Spake, J. J.; Wyttenbach, A.; Pino, L.; Pepe, F.; Sing, D. K.; Lecavelier des Etangs, A.
Publication:
Science, Volume 362, Issue 6421, pp. 1384-1387 (2018).
Copyright ©
(c) 2018: Science

2018 November

Authors:
Bourrier, V.; Ehrenreich, D.; Allart, R.; Wyttenbach, A.; Semaan, T.; Astudillo-Defru, N.; Gracia-Berná, A.; Lovis, C.; Pepe, F.; Thomas, N.; Udry, S.
Publication:
Astronomy & Astrophysics, Volume 602, id.A106, 12 pp.

2017 May

Authors:
Nikolov, N.; Sing, D. K.; Goyal, J.; Henry, G. W.; Wakeford, H. R.; Evans, T. M.; López-Morales, M.; García Muñoz, A.; Ben-Jaffel, L.; Sanz-Forcada, J.; Ballester, G. E.; Kataria, T.; Barstow, J. K.; Bourrier, V.; Buchhave, L. A.; Cohen, O.; Deming, D.; Ehrenreich, D.; Knutson, H.; Lavvas, P.; Lecavelier des Etangs, A.; Lewis, N. K.; Mandell, A. M.; Williamson, M. H.
Publication:
Monthly Notices of the Royal Astronomical Society, Volume 474, Issue 2, p.1705-1717
Copyright ©
2017 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society

2018 January

Authors:
Udry, S.; Dumusque, X.; Lovis, C.; Ségransan, D.; Diaz, R. F.; Benz, W.; Bouchy, F.; Coffinet, A.; Lo Curto, G.; Mayor, M.; Mordasini, C.; Motalebi, F.; Pepe, F.; Queloz, D.; Santos, N. C.; Wyttenbach, A.; Alonso, R.; Collier Cameron, A.; Deleuil, M.; Figueira, P.; Gillon, M.; Moutou, C.; Pollacco, D.; Pompei, E.
Publication:
Astronomy & Astrophysics, Volume 622, id.A37, 29 pp.

2019 January

Authors:
Díaz, R. F.; Ségransan, D.; Udry, S.; Lovis, C.; Pepe, F.; Dumusque, X.; Marmier, M.; Alonso, R.; Benz, W.; Bouchy, F.; Coffinet, A.; Collier Cameron, A.; Deleuil, M.; Figueira, P.; Gillon, M.; Lo Curto, G.; Mayor, M.; Mordasini, C.; Motalebi, F.; Moutou, C.; Pollacco, D.; Pompei, E.; Queloz, D.; Santos, N.; Wyttenbach, A.
Publication:
Astronomy & Astrophysics, Volume 585, id.A134, 24 pp.

2015 December

Authors:
Jin, Sheng; Mordasini, Christoph
Publication:
The Astrophysical Journal, Volume 853, Issue 2, article id. 163, 23 pp. (2018).

2018 January

Authors:
Barkaoui, K.; Burdanov, A.; Hellier, C.; Gillon, M.; Smalley, B.; Maxted, P. F. L.; Lendl, M.; Triaud, A. H. M. J.; Anderson, D. R.; McCormac, J.; Jehin, E.; Almleaky, Y.; Armstrong, D. J.; Benkhaldoun, Z.; Bouchy, F.; Brown, D. J. A.; Cameron, A. C.; Daassou, A.; Delrez, L.; Ducrot, E.; Foxell, E.; Murray, C.; Nielsen, L. D.; Pepe, F.; Pollacco, D.; Pozuelos, F. J.; Queloz, D.; Segransan, D.; Udry, S.; Thompson, S.; West, R. G.
Publication:
The Astronomical Journal, Volume 157, Issue 2, article id. 43, 10 pp. (2019).

2019 January

Authors:
Bourrier, V.; Dumusque, X.; Dorn, C.; Henry, G. W.; Astudillo-Defru, N.; Rey, J.; Benneke, B.; Hébrard, G.; Lovis, C.; Demory, B. O.; Moutou, C.; Ehrenreich, D.
Publication:
Astronomy & Astrophysics, Volume 619, id.A1, 18 pp.

2018 September

Authors:
Malavolta, Luca; Mayo, Andrew W.; Louden, Tom; Rajpaul, Vinesh M.; Bonomo, Aldo S.; Buchhave, Lars A.; Kreidberg, Laura; Kristiansen, Martti H.; Lopez-Morales, Mercedes; Mortier, Annelies; Vanderburg, Andrew; Coffinet, Adrien; Ehrenreich, David; Lovis, Christophe; Bouchy, Francois; Charbonneau, David; Ciardi, David R.; Collier Cameron, Andrew; Cosentino, Rosario; Crossfield, Ian J. M.; Damasso, Mario; Dressing, Courtney D.; Dumusque, Xavier; Everett, Mark E.; Figueira, Pedro; Fiorenzano, Aldo F. M.; Gonzales, Erica J.; Haywood, Raphaëlle D.; Harutyunyan, Avet; Hirsch, Lea; Howell, Steve B.; Johnson, John Asher; Latham, David W.; Lopez, Eric; Mayor, Michel; Micela, Giusi; Molinari, Emilio; Nascimbeni, Valerio; Pepe, Francesco; Phillips, David F.; Piotto, Giampaolo; Rice, Ken; Sasselov, Dimitar; Ségransan, Damien; Sozzetti, Alessandro; Udry, Stéphane; Watson, Chris
Publication:
The Astronomical Journal, Volume 155, Issue 3, article id. 107, 13 pp. (2018).

2018 February

Authors:
Kiefer, F.; Vidal-Madjar, A.; Lecavelier des Etangs, A.; Bourrier, V.; Ehrenreich, D.; Ferlet, R.; Hébrard, G.; Wilson, P. A.
Publication:
Astronomy & Astrophysics, Volume 621, id.A58, 9 pp.

2018 December

Authors:
Spake, J. J.; Sing, D. K.; Evans, T. M.; Oklopčić, A.; Bourrier, V.; Kreidberg, L.; Rackham, B. V.; Irwin, J.; Ehrenreich, D.; Wyttenbach, A.; Wakeford, H. R.; Zhou, Y.; Chubb, K. L.; Nikolov, N.; Goyal, J. M.; Henry, G. W.; Williamson, M. H.; Blumenthal, S.; Anderson, D. R.; Hellier, C.; Charbonneau, D.; Udry, S.; Madhusudhan, N.
Publication:
Nature, Volume 557, Issue 7703, p.68-70
Copyright ©
2018: Macmillan Publishers Ltd., part of Springer Nature

2018 April

Authors:
Bayliss, D.; Hartman, J. D.; Zhou, G.; Bakos, G. Á.; Vanderburg, A.; Bento, J.; Mancini, L.; Ciceri, S.; Brahm, R.; Jordán, A.; Espinoza, N.; Rabus, M.; Tan, T. G.; Penev, K.; Bhatti, W.; de Val-Borro, M.; Suc, V.; Csubry, Z.; Henning, Th.; Sarkis, P.; Lázár, J.; Papp, I.; Sári, P.
Publication:
The Astronomical Journal, Volume 155, Issue 3, article id. 119, 14 pp. (2018).

2018 February

Authors:
Bonfils, X.; Almenara, J. -M.; Cloutier, R.; Wünsche, A.; Astudillo-Defru, N.; Berta-Thompson, Z.; Bouchy, F.; Charbonneau, D.; Delfosse, X.; Díaz, R. F.; Dittmann, J.; Doyon, R.; Forveille, T.; Irwin, J.; Lovis, C.; Mayor, M.; Menou, K.; Murgas, F.; Newton, E.; Pepe, F.; Santos, N. C.; Udry, S.
Publication:
Astronomy & Astrophysics, Volume 618, id.A142, 12 pp.

2018 September

Authors:
Cheetham, A.; Ségransan, D.; Peretti, S.; Delisle, J. -B.; Hagelberg, J.; Beuzit, J. -L.; Forveille, T.; Marmier, M.; Udry, S.; Wildi, F.
Publication:
Astronomy & Astrophysics, Volume 614, id.A16, 19 pp.

2018 May

Authors:
Reggiani, M.; Meyer, M. R.; Chauvin, G.; Vigan, A.; Quanz, S. P.; Biller, B.; Bonavita, M.; Desidera, S.; Delorme, P.; Hagelberg, J.; Maire, A. -L.; Boccaletti, A.; Beuzit, J. -L.; Buenzli, E.; Carson, J.; Covino, E.; Feldt, M.; Girard, J.; Gratton, R.; Henning, T.; Kasper, M.; Lagrange, A. -M.; Mesa, D.; Messina, S.; Montagnier, G.; Mordasini, C.; Mouillet, D.; Schlieder, J. E.; Segransan, D.; Thalmann, C.; Zurlo, A.
Publication:
Astronomy & Astrophysics, Volume 586, id.A147, 7 pp.

2016 January

Authors:
Demangeon, O. D. S.; Faedi, F.; Hébrard, G.; Brown, D. J. A.; Barros, S. C. C.; Doyle, A. P.; Maxted, P. F. L.; Cameron, A. Collier; Hay, K. L.; Alikakos, J.; Anderson, D. R.; Armstrong, D. J.; Boumis, P.; Bonomo, A. S.; Bouchy, F.; Delrez, L.; Gillon, M.; Haswell, C. A.; Hellier, C.; Jehin, E.; Kiefer, F.; Lam, K. W. F.; Lendl, M.; Mancini, L.; McCormac, J.; Norton, A. J.; Osborn, H. P.; Palle, E.; Pepe, F.; Pollacco, D. L.; Prieto-Arranz, J.; Queloz, D.; Ségransan, D.; Smalley, B.; Triaud, A. H. M. J.; Udry, S.; West, R.; Wheatley, P. J.
Publication:
Astronomy & Astrophysics, Volume 610, id.A63, 19 pp.

2018 February

Authors:
Kraus, Stefan; Petrov, Romain; Pott, Joerg-Uwe; Mordasini, Christoph; Monnier, John; Ireland, Michael; Vasisht, Gautam; Berger, Jean-Philippe; Turner, Neal; Baron, Fabien; Isella, Andrea; Bayo, Amelia; Creech-Eakman, Michelle; Dong, Roubing; Duchene, Gaspard; Espaillat, Catherine; Haniff, Chris; Hoenig, Sebastian; Juhasz, Attila; Labadie, Lucas; Lacour, Sylvestre; Merand, Antoine; Michael, Ernest; Minardi, Stefano; Mozurkewich, Dave; Olofsson, Johan; Paladini, Claudia; Ridgway, Stephen; Rinehart, Stephen; Stassun, Keivan; Surdej, Jean; Ten Brummelaar, Theo; Tuthill, Peter; Van Belle, Gerard; Wishnow, Ed; Young, John; Zhu, Zhaohuan
Publication:
42nd COSPAR Scientific Assembly. Held 14-22 July 2018, in Pasadena, California, USA, Abstract id. E4.2-11-18.

2018 June

Authors:
Wakeford, H. R.; Lewis, N. K.; Fowler, J.; Bruno, G.; Wilson, T. J.; Moran, S. E.; Valenti, J.; Batalha, N. E.; Filippazzo, J.; Bourrier, V.; Hörst, S. M.; Lederer, S. M.; de Wit, J.
Publication:
The Astronomical Journal, Volume 157, Issue 1, article id. 11, 14 pp. (2019).

2018 December

Authors:
Suárez Mascareño, A.; González Hernández, J. I.; Rebolo, R.; Velasco, S.; Toledo-Padrón, B.; Udry, S.; Motalebi, F.; Ségrasan, D.; Wyttenbach, A.; Mayor, M.; Pepe, F.; Lovis, C.; Santos, N. C.; Figueira, P.; Esposito, M.
Publication:
Astronomy & Astrophysics, Volume 612, id.A41, 16 pp.

2018 March

Authors:
Bourrier, V.; Ehrenreich, D.; Lecavelier des Etangs, A.; Louden, T.; Wheatley, P. J.; Wyttenbach, A.; Vidal-Madjar, A.; Lavie, B.; Pepe, F.; Udry, S.
Publication:
Astronomy & Astrophysics, Volume 615, id.A117, 18 pp.

2018 June

Authors:
Lendl, M.; Ehrenreich, D.; Turner, O. D.; Bayliss, D.; Blanco-Cuaresma, S.; Giles, H.; Bouchy, F.; Marmier, M.; Udry, S.
Publication:
Astronomy & Astrophysics, Volume 603, id.L5, 4 pp.

2017 June

Authors:
Mordasini, C.; van Boekel, R.; Mollière, P.; Henning, Th.; Benneke, Björn
Publication:
The Astrophysical Journal, Volume 832, Issue 1, article id. 41, 32 pp. (2016).

2016 October

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