National Centre of Competence in Research PlanetS
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Project 3.3: Direct imaging & spectra of ultra-cool companions to nearby stars

Most of the directly imaged exoplanets today are very young and warm with spectral type rang- ing from L to T corresponding to effective temperatures larger than 700K. In most cases, the age estimate of the parent stars combined to giant planets evolutionary models bring some constraints on the mass of the discovered planets but large uncertainties remain (Moya et al. MNRAS 405, L81,2010). Indeed, the evolution of massive giant planets (mass, radius luminosity, chemical composition, Teff) is a challenging task that is mainly unconstrained. The recent discovery of the ultra-cool companion (Teff~400K) to the old main sequence G dwarf HD4113A (Cheetham, Ségransan et al. 2018A&A…614A..16C) with SPHERE identify strong discrepancies between several predicted and observed planet parameters (mainly on Teff, Luminosity and mass). This study shows that deriving dynamical masses of such cool objects is critical to better understand the physics of ultra-cool brown dwarfs and giant planets for which almost no constraint exists beside our own Solar System. Following the work on HD4113, this project aims at identifying and studying the physics (chemical composition, evolution, mass determination) of all ultra-cool companions to nearby main sequence stars in the separation range of 10-50AU. Such a challenging feat is now possible thanks to:

  1. a unique sample of nearby stars with promising low mass companion candidates derived from 20 years of precise radial velocity measurements with CORALIE/HARPS and close to 5 year of astrometric measurements with GAIA.
  2. state of the art high contrast imaging & Spectroscopic instruments installed on both ground (SPHERE/GPI) and space (JWST) facilities that allow us to detect and characterise faint companions with contrast as high as 300 000 (∆mag=13.5-14) in the near infrared.

HD4113 C detected with SPHERE IRDIS + IFS (Cheetham, Ségransan et al. 2018A&A…614A..16C)

Authors:
Huang, Chelsea X.; Burt, Jennifer; Vanderburg, Andrew; Günther, Maximilian N.; Shporer, Avi; Dittmann, Jason A.; Winn, Joshua N.; Wittenmyer, Rob; Sha, Lizhou; Kane, Stephen R.; Ricker, George R.; Vanderspek, Roland K.; Latham, David W.; Seager, Sara; Jenkins, Jon M.; Caldwell, Douglas A.; Collins, Karen A.; Guerrero, Natalia; Smith, Jeffrey C.; Quinn, Samuel N.; Udry, Stéphane; Pepe, Francesco; Bouchy, François; Ségransan, Damien; Lovis, Christophe; Ehrenreich, David; Marmier, Maxime; Mayor, Michel; Wohler, Bill; Haworth, Kari; Morgan, Edward H.; Fausnaugh, Michael; Ciardi, David R.; Christiansen, Jessie; Charbonneau, David; Dragomir, Diana; Deming, Drake; Glidden, Ana; Levine, Alan M.; McCullough, P. R.; Yu, Liang; Narita, Norio; Nguyen, Tam; Morton, Tim; Pepper, Joshua; Pál, András; Rodriguez, Joseph E.; Stassun, Keivan G.; Torres, Guillermo; Sozzetti, Alessandro; Doty, John P.; Christensen-Dalsgaard, Jørgen; Laughlin, Gregory; Clampin, Mark; Bean, Jacob L.; Buchhave, Lars A.; Bakos, G. Á.; Sato, Bun’ei; Ida, Shigeru; Kaltenegger, Lisa; Palle, Enric; Sasselov, Dimitar; Butler, R. P.; Lissauer, Jack; Ge, Jian; Rinehart, S. A.
Publication:
The Astrophysical Journal Letters, Volume 868, Issue 2, article id. L39, 8 pp. (2018).

2018 November

Authors:
Lam, K. W. F.; Santerne, A.; Sousa, S. G.; Vigan, A.; Armstrong, D. J.; Barros, S. C. C.; Brugger, B.; Adibekyan, V.; Almenara, J. -M.; Delgado Mena, E.; Dumusque, X.; Barrado, D.; Bayliss, D.; Bonomo, A. S.; Bouchy, F.; Brown, D. J. A.; Ciardi, D.; Deleuil, M.; Demangeon, O.; Faedi, F.; Foxell, E.; Jackman, J. A. G.; King, G. W.; Kirk, J.; Ligi, R.; Lillo-Box, J.; Lopez, T.; Lovis, C.; Louden, T.; Nielsen, L. D.; McCormac, J.; Mousis, O.; Osborn, H. P.; Pollacco, D.; Santos, N. C.; Udry, S.; Wheatley, P. J.
Publication:
Astronomy & Astrophysics, Volume 620, id.A77, 13 pp.

2018 October

Authors:
Oshagh, M.; Triaud, A. H. M. J.; Burdanov, A.; Figueira, P.; Reiners, A.; Santos, N. C.; Faria, J.; Boue, G.; Díaz, R. F.; Dreizler, S.; Boldt, S.; Delrez, L.; Ducrot, E.; Gillon, M.; Guzman Mesa, A.; Jehin, E.; Khalafinejad, S.; Kohl, S.; Serrano, L.; Udry, S.
Publication:
Astronomy & Astrophysics, Volume 619, id.A150, 17 pp.

2018 October

Authors:
Hodžić, Vedad; Triaud, Amaury H. M. J.; Anderson, David R.; Bouchy, François; Collier Cameron, Andrew; Delrez, Laetitia; Gillon, Michaël; Hellier, Coel; Jehin, Emmanuël; Lendl, Monika; Maxted, Pierre F. L.; Pepe, Francesco; Pollacco, Don; Queloz, Didier; Ségransan, Damien; Smalley, Barry; Udry, Stéphane; West, Richard
Publication:
Monthly Notices of the Royal Astronomical Society, Volume 481, Issue 4, p.5091-5097
Copyright ©
2018 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society

2018 November

Authors:
Szulágyi, Judit; Cilibrasi, Marco; Mayer, Lucio
Publication:
The Astrophysical Journal Letters, Volume 868, Issue 1, article id. L13, 6 pp. (2018).

2018 October

Authors:
Kaminski, A.; Trifonov, T.; Caballero, J. A.; Quirrenbach, A.; Ribas, I.; Reiners, A.; Amado, P. J.; Zechmeister, M.; Dreizler, S.; Perger, M.; Tal-Or, L.; Bonfils, X.; Mayor, M.; Astudillo-Defru, N.; Bauer, F. F.; Béjar, V. J. S.; Cifuentes, C.; Colomé, J.; Cortés-Contreras, M.; Delfosse, X.; Díez-Alonso, E.; Forveille, T.; Guenther, E. W.; Hatzes, A. P.; Henning, Th.; Jeffers, S. V.; Kürster, M.; Lafarga, M.; Luque, R.; Mandel, H.; Montes, D.; Morales, J. C.; Passegger, V. M.; Pedraz, S.; Reffert, S.; Sadegi, S.; Schweitzer, A.; Seifert, W.; Stahl, O.; Udry, S.
Publication:
Astronomy & Astrophysics, Volume 618, id.A115, 11 pp.

2018 September

Authors:
Queloz, Didier; Benz, Willy
Publication:
European Planetary Science Congress 2018, held 16-21 September 2018 at TU Berlin, Berlin, Germany, id.EPSC2018-82

2018 August

Authors:
Huélamo, N.; Chauvin, G.; Schmid, H. M.; Quanz, S. P.; Whelan, E.; Lillo-Box, J.; Barrado, D.; Montesinos, B.; Alcalá, J. M.; Benisty, M.; Gregorio-Monsalvo, I. de; Mendigutía, I.; Bouy, H.; Merín, B.; de Boer, J.; Garufi, A.; Pantin, E.
Publication:
Astronomy & Astrophysics, Volume 613, id.L5, 5 pp.

2018 April

Authors:
Billot, Nicolas
Publication:
42nd COSPAR Scientific Assembly. Held 14-22 July 2018, in Pasadena, California, USA, Abstract id. E4.1-6-18.

2018 June

Authors:
Ballabio, G.; Dipierro, G.; Veronesi, B.; Lodato, G.; Hutchison, M.; Laibe, G.; Price, D. J.
Publication:
Monthly Notices of the Royal Astronomical Society, Volume 477, Issue 2, p.2766-2771
Copyright ©
2018 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society

2018 May

Authors:
Raynard, Liam; Goad, Michael R.; Gillen, Edward; Nielsen, Louise D.; Watson, Christopher A.; Thompson, Andrew P. G.; McCormac, James; Bayliss, Daniel; Soto, Maritza; Csizmadia, Szilard; Chaushev, Alexander; Burleigh, Matthew R.; Alexander, Richard; Armstrong, David J.; Bouchy, François; Briegal, Joshua T.; Cabrera, Juan; Casewell, Sarah L.; Chazelas, Bruno; Cooke, Benjamin F.; Eigmüller, Philipp; Erikson, Anders; Gänsicke, Boris T.; Grange, Andrew; Günther, Maximilian N.; Hodgkin, Simon T.; Hooton, Matthew J.; Jenkins, James S.; Lambert, Gregory; Louden, Tom; Metrailler, Lionel; Moyano, Maximiliano; Pollacco, Don; Poppenhaeger, Katja; Queloz, Didier; Raddi, Roberto; Rauer, Heike; Read, Andrew M.; Smalley, Barry; Smith, Alexis M. S.; Turner, Oliver; Udry, Stéphane; Walker, Simon R.; West, Richard G.; Wheatley, Peter J.
Publication:
Monthly Notices of the Royal Astronomical Society, Volume 481, Issue 4, p.4960-4970
Copyright ©
2018 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society

2018 November

Authors:
Casassus, Simon; Avenhaus, Henning; Pérez, Sebastián; Navarro, Víctor; Cárcamo, Miguel; Marino, Sebastián; Cieza, Lucas; Quanz, Sascha P.; Alarcón, Felipe; Zurlo, Alice; Osses, Axel; Rannou, Fernando R.; Román, Pablo E.; Barraza, Marcelo
Publication:
Monthly Notices of the Royal Astronomical Society, Volume 477, Issue 4, p.5104-5114
Copyright ©
2018 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society

2018 June

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