J
John Lee Grenfell
Researcher at German Aerospace Center
Publications - 52
Citations - 1978
John Lee Grenfell is an academic researcher from German Aerospace Center. The author has contributed to research in topics: Exoplanet & Planet. The author has an hindex of 23, co-authored 52 publications receiving 1737 citations. Previous affiliations of John Lee Grenfell include Technical University of Berlin.
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Journal ArticleDOI
What makes a planet habitable
Helmut Lammer,Jan Hendrik Bredehöft,Athena Coustenis,Maxim L. Khodachenko,Lisa Kaltenegger,Olivier Grasset,Daniel Prieur,François Raulin,Pascale Ehrenfreund,M. Yamauchi,Jan-Erik Wahlund,Jean-Mathias Grießmeier,Günter Stangl,Charles S. Cockell,Yu. N. Kulikov,John Lee Grenfell,Heike Rauer +16 more
TL;DR: In this article, the authors discuss the geodynamical and geophysical environments which are necessary for planets where plate tectonics remain active over geological time scales and for planets which evolve to one-plate planets.
Journal ArticleDOI
Potential biosignatures in super-Earth atmospheres I. Spectral appearance of super-Earths around M dwarfs
Heike Rauer,Heike Rauer,S Gebauer,Philip von Paris,Juan Cabrera,M Godolt,John Lee Grenfell,A Belu,A Belu,Franck Selsis,Franck Selsis,P. Hedelt,P. Hedelt,Franz Schreier +13 more
TL;DR: In this article, the spectral appearance of molecular absorption bands, which are relevant as indicators for potential planetary habitability during primary and secondary eclipse for transiting terrestrial planets with Earth-like biomass emissi ons, was investigated.
Journal ArticleDOI
EChO - Exoplanet Characterisation Observatory
Giovanna Tinetti,J. P. Beaulieu,Th. Henning,Michael Meyer,Giuseppina Micela,Ignasi Ribas,Daphne Stam,Mark R. Swain,Oliver Krause,Marc Ollivier,Emanuele Pace,B. M. Swinyard,Alan D. Aylward,R. van Boekel,Angioletta Coradini,T. Encrenaz,Ignas Snellen,M. R. Zapatero-Osorio,Jeroen Bouwman,James Y-K. Cho,V. Coudé de Foresto,Tristan Guillot,Mercedes Lopez-Morales,I. Mueller-Wodarg,Enric Palle,F. Selsis,Alessandro Sozzetti,Peter A. R. Ade,Nicholas Achilleos,Alberto Adriani,Craig B. Agnor,Cristina Afonso,C. Allende Prieto,Gáspár Á. Bakos,Rosemary Barber,M. J. Barlow,V. Batista,Peter F. Bernath,Bruno Bézard,Pascal Bordé,Linda R. Brown,Arnaud Cassan,C. Cavarroc,Angela Ciaravella,Charles S. Cockell,A. Coustenis,Camilla Danielski,L. Decin,R. de Kok,O. D. S. Demangeon,Pieter Deroo,Peter Doel,Pierre Drossart,Leigh N. Fletcher,Mauro Focardi,François Forget,S. J. Fossey,P. Fouque,J. Frith,Marina Galand,Patrick Gaulme,J. I. González Hernández,Olivier Grasset,Davide Grassi,John Lee Grenfell,Matthew Joseph Griffin,Caitlin A. Griffith,Ulrich Grözinger,Manuel Guedel,Patrick Guio,Olivier Hainaut,Robert J. Hargreaves,Peter H. Hauschildt,Kevin Heng,D. Heyrovsky,Ricardo Hueso,Patrick G. J. Irwin,Lisa Kaltenegger,Pierre Kervella,David M. Kipping,Tommi Koskinen,Géza Kovács,A. La Barbera,Helmut Lammer,E. Lellouch,Giuseppe Leto,M. Lopez Morales,M. A. Lopez Valverde,Manuel López-Puertas,C. Lovis,Antonio Maggio,Jean-Pierre Maillard,J. Maldonado Prado,J. B. Marquette,F. J. Martin-Torres,Pierre F. L. Maxted,Steve Miller,Sergio Molinari,D. Montes,Amaya Moro-Martin,J. I. Moses,O. Mousis,N. Nguyen Tuong,Richard P. Nelson,G. S. Orton,Eric Pantin,Enzo Pascale,Stefano Pezzuto,D. J. Pinfield,Ennio Poretti,Raman K. Prinja,Loredana Prisinzano,J. M. Rees,Ansgar Reiners,B. Samuel,Agustín Sánchez-Lavega,J. Sanz Forcada,Dimitar Sasselov,Giorgio Savini,Bruno Sicardy,Andrew Smith,Lars Stixrude,Giovanni Strazzulla,Jonathan Tennyson,M. Tessenyi,Gautam Vasisht,Sandrine Vinatier,Serena Viti,Ingo Waldmann,Glenn J. White,Thomas Widemann,Robin Wordsworth,Roger V. Yelle,Yuk L. Yung,Sergei N. Yurchenko +134 more
TL;DR: The Exoplanet Characterisation Observatory (EChO) as mentioned in this paper is a mission concept specifically geared for this purpose, providing simultaneous, multi-wavelength spectroscopic observations on a stable platform that will allow very long exposures.
Journal ArticleDOI
Clouds in the atmospheres of extrasolar planets - I. Climatic effects of multi-layered clouds for Earth-like planets and implications for habitable zones
D. Kitzmann,A. B. C. Patzer,P. von Paris,M. Godolt,B. Stracke,Stefanie Gebauer,John Lee Grenfell,Heike Rauer,Heike Rauer +8 more
TL;DR: In this paper, a parametric cloud model has been developed based on observations in the Earth's atmosphere to study the effect of clouds on the surface temperature and the Bond albedo of Earth-like planets orbiting different types of main sequence dwarf stars.
Journal ArticleDOI
Spectral features of Earth-like planets and their detectability at different orbital distances around F, G, and K-type stars
Pascal Hedelt,Pascal Hedelt,P. von Paris,P. von Paris,M Godolt,S Gebauer,John Lee Grenfell,Heike Rauer,Heike Rauer,Franz Schreier,Franck Selsis,Thomas Trautmann +11 more
TL;DR: In this paper, the spectral appearance of Earth-like exoplanets in the habitable zone (HZ) of different main sequence (F, G, and K-type) stars at different orbital distances was investigated.