Exoplanets

Definition

Exoplanets are the celestial bodies orbiting stars other than our Sun. Their small size makes them difficult to detect from Earth, particularly as they appear much dimmer than their parent stars. So indirect methods are employed, such as observing changes in starlight as a result of the exoplanet and its motion.

Latest Research and Reviews

  • Research |

    The inner four planets of the TRAPPIST-1 system experienced induction heating due to magnetic interaction with their host star. This led them to experience increased volcanic activity, outgassing and potentially a subsurface magma ocean.

    • K. G. Kislyakova
    • , L. Noack
    • , C. P. Johnstone
    • , V. V. Zaitsev
    • , L. Fossati
    • , H. Lammer
    • , M. L. Khodachenko
    • , P. Odert
    •  & M. Güdel
  • Research |

    Titanium oxide, water, sodium and a strongly scattering haze have been detected in the atmosphere of the hot Jupiter exoplanet WASP-19b.

    • Elyar Sedaghati
    • , Henri M. J. Boffin
    • , Ryan J. MacDonald
    • , Siddharth Gandhi
    • , Nikku Madhusudhan
    • , Neale P. Gibson
    • , Mahmoudreza Oshagh
    • , Antonio Claret
    •  & Heike Rauer
    Nature 549, 238–241
  • Research |

    Brightness changes of the Sun over timescales from minutes to decades, relevant to Earth’s climate and the detection of exoplanets around Sun-like stars, can be fully and precisely explained by the magnetic field and granulation of the Sun’s surface.

    • A. I. Shapiro
    • , S. K. Solanki
    • , N. A. Krivova
    • , R. H. Cameron
    • , K. L. Yeo
    •  & W. K. Schmutz
    Nature Astronomy 1, 612–616
  • Research |

    Observations of the gas-giant exoplanet WASP-121b reveal near-infrared emission lines of water, suggesting that the planet has a stratosphere—a layer in the upper atmosphere where temperature increases with altitude.

    • Thomas M. Evans
    • , David K. Sing
    • , Tiffany Kataria
    • , Jayesh Goyal
    • , Nikolay Nikolov
    • , Hannah R. Wakeford
    • , Drake Deming
    • , Mark S. Marley
    • , David S. Amundsen
    • , Gilda E. Ballester
    • , Joanna K. Barstow
    • , Lotfi Ben-Jaffel
    • , Vincent Bourrier
    • , Lars A. Buchhave
    • , Ofer Cohen
    • , David Ehrenreich
    • , Antonio García Muñoz
    • , Gregory W. Henry
    • , Heather Knutson
    • , Panayotis Lavvas
    • , Alain Lecavelier des Etangs
    • , Nikole K. Lewis
    • , Mercedes López-Morales
    • , Avi M. Mandell
    • , Jorge Sanz-Forcada
    • , Pascal Tremblin
    •  & Roxana Lupu
    Nature 548, 58–61

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