Searching for Planets in the Alpha Cen System: from Jupiters to Earth Analogs

Details Searching for Planets in the Alpha Cen System: from Jupiters to Earth Analogs Searching for Planets in the Alpha Cen System: from Jupiters to Earth Analogs

Dec 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009dps....41.6808e&link_type=abstract

American Astronomical Society, DPS meeting #41, #68.08

Astronomy and Astrophysics

Astronomy

3

Scientific paper

The Alpha Centauri system is an ideal target to perform a ground-based Doppler search for Earth-like planets in the habitable zones of the components A (G2V) and B (K1V). For more than 15 years we have collected precise differential radial velocity measurements of alpha Cen, obtained with the ESO 3.6m telescope and its Coude Echelle Spectrograph (Long Camera/Very Long Camera), as well as HARPS. First constraints on the presence of giant planets based on 5 years of data were presented by Endl et al. (2001), excluding Jovian-type planets at separations of less than 3 AU. With ten more years of data we have a significantly higher sensitivity for low mass planets. We present our current detection limits for planets in the alp Cen system. Furthermore, we describe our plan to use the HERCULES spectrograph at the 1m McLellan telescope at Mt. John observatory, NZ, to detect Earth-mass planets at 1 AU.

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