4.7 Article

Trumpeting M dwarfs with CONCH-SHELL: a catalogue of nearby cool host-stars for habitable exoplanets and life

期刊

出版社

OXFORD UNIV PRESS
DOI: 10.1093/mnras/stu1313

关键词

astrobiology; techniques: spectroscopic; planets and satellites: detection; stars: fundamental parameters; stars: late-type; stars: low-mass

资金

  1. NASA [NNX10AQ36G, NNX11AC33G]
  2. Robert Martin Ayers Sciences Fund
  3. National Aeronautics and Space Administration under Exoplanet Exploration Programme
  4. NASA [125936, NNX11AC33G, 149440, NNX10AQ36G] Funding Source: Federal RePORTER
  5. Direct For Mathematical & Physical Scien
  6. Division Of Astronomical Sciences [1418999] Funding Source: National Science Foundation

向作者/读者索取更多资源

We present an all-sky catalogue of 2970 nearby (d less than or similar to 50 pc), bright (J < 9) M-or late K-type dwarf stars, 86 per cent of which have been confirmed by spectroscopy. This catalogue will be useful for searches for Earth-size and possibly Earth-like planets by future space-based transit missions and ground-based infrared Doppler radial velocity surveys. Stars were selected from the SUPERBLINK proper motion catalogue according to absolute magnitudes, spectra, or a combination of reduced proper motions and photometric colours. From our spectra, we determined gravity-sensitive indices, and identified and removed 0.2 per cent of these as interloping hotter or evolved stars. 13 per cent of the stars exhibit Ha emission, an indication of stellar magnetic activity and possible youth. The mean metallicity is [Fe/H] = -0.07 with a standard deviation of 0.22 dex, similar to nearby solar-type stars. We determined stellar effective temperatures by least-squares fitting of spectra to model predictions calibrated by fits to stars with established bolometric temperatures, and estimated radii, luminosities, and masses using empirical relations. Six per cent of stars with images from integral field spectra are resolved doubles. We inferred the planet population around M dwarfs using Kepler data and applied this to our catalogue to predict detections by future exoplanet surveys.

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