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Article overview
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Planets around stars in young nearby associations *** radial Velocity searches: a feasibility study, and first results | A.-M. Lagrange
; N. Meunier
; G. Chauvin
; M. Sterzik
; F. Galland
; G. Lo Curto
; J. Rameau
; D. Sosnowska
; | Date: |
19 Apr 2013 | Abstract: | Stars in young nearby associations are the only targets allowing giant planet
searches at all separations in the near future, by coupling indirect techniques
such as radial velocity and deep imaging. These stars are first priorities
targets for the forthcoming planets imagers on 10-m class telescopes. Young
stars rotate more rapidly and are more active than their older counterparts.
Both effects can limit the capability to detect planets using RV. We wish to
explore the planet detection capabilities of a representative sample of stars
in close and young associations with radial velocity data and explore the
complementarity between this technique and direct imaging. We observed 26 such
targets with spectral types from A to K and ages from 8 to 300 Myr with HARPS.
We compute the detection limits. We also attempt to improve the detection
limits in a few cases by correcting for the stellar activity. Our A-type stars
RV show high frequency variations due to pulsations, while our F-K stars
clearly show activity with more or less complex patterns. For F-K stars, the RV
jitter and v sini rapidly decrease with star age. The data allow us to search
for planets with periods typically ranging from 1 day to 100 days, and up to
more than 500 days in a few cases. Within the present detection limits, no
planet was found in our sample. For the bulk of our F-K stars, the detection
limits fall down to sub-Jupiter masses.We show that these limits can be
significantly improved by correcting even partially for stellar activity, down
to a few Neptune masses for the least active stars. The detection limits on
A-type stars can be significantly improved, down to a few Jupiter mass planets,
provided an appropriate observing strategy. We finally show the tremendous
potential of coupling RV and AO deep imaging results. | Source: | arXiv, 1304.5505 | Services: | Forum | Review | PDF | Favorites |
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