We present here the detection of a planet orbiting around the F6V star HD
33564. The radial velocity measurements, obtained with the ELODIE echelle
spectrograph at the Haute-Provence Observatory, show a variation with a period
of 388 days. Assuming a primary mass of 1.25 Mo, the best Keplerian fit to the
data leads to a minimum mass of 9.1 MJup for the companion.Comment: 5 pages. Final version, accepted for publication (A&A). Some Spitzer
  results on HD33564 (taken this year; not yet published), finally show that
  the detection of IR excess around this star (by IRAS) is spuriou

A. Chelli

A.-M. Lagrange

Acke

Aumann

Baranne

Chelli

F. Galland

F. Pepe

Galland

Garrison

J.-L. Beuzit

M. Mayor

Mayor

Nordtrom

Patten

Pepe

Queloz

S. Udry

Udry

English

arXiv

International audienceIn the frame of the search for extrasolar planets and brown dwarfs around early-type stars, we present the results obtained on β Pictoris, which is surrounded by a circumstellar disk that is warped by the presence of a planet. We used 97 spectra acquired with CORALIE and 230 spectra acquired with HARPS to characterize the radial velocity behavior of β Pictoris and to infer constraints on the presence of a planet close to this star. With these data, we were able to exclude the presence of an inner giant planet (2 M_Jup at a distance to the star of 0.05 AU, 9 M_Jup at 1 AU). We also discuss the origin of the observed radial velocity variations in terms of δ Scuti type pulsations

Galland, F.

Lagrange, A.-M.

Udry, S.

Chelli, A.

Pepe, F.

Beuzit, J.-L.

Mayor, M.

Hal - Université Grenoble Alpes

Extrasolar planets and brown dwarfs around A-F type stars. III. beta Pictoris: looking for planets, finding pulsations

International audienceWe present here the detection of a brown dwarf orbiting the A9V star HD 180777. The radial velocity measurements, obtained with the ELODIE echelle spectrograph at the Haute-Provence Observatory, show a main variation with a period of 28.4 days. Assuming a primary mass of 1.7 Mȯ, the best Keplerian fit to the data leads to a minimum mass of 25 M{Jup} for the companion (the true mass could be significantly higher). We also show that, after subtraction of the Keplerian solution from the radial velocity measurements, the residual radial velocities are related to phenomena intrinsic to the star, namely pulsations with typical periods of γ Dor stars. These results show that in some cases, it is possible to disentangle radial velocity variations due to a low mass companion from variations intrinsic to the observed star

HAL: Hyper Article en Ligne

Extrasolar planets and brown dwarfs around A-F type stars. IV. A candidate brown dwarf around the A9V pulsating star HD 180777

We present here the detection of a planet orbiting around the F6V
 star HD 33564. The radial velocity measurements, obtained with the
 ELODIE echelle spectrograph at the Haute-Provence Observatory,
 show a variation with a period of 388 days. Assuming a primary
 mass of 1.25 $M_{\odot}$, the best Keplerian fit to the data leads
 to a minimum mass of 9.1 MJup for the companion.

EDP Sciences OAI-PMH repository (1.2.0)

Extrasolar planets and brown dwarfs around A–F type stars

We present here the detection of a brown dwarf orbiting the A9V
 star HD 180777. The radial velocity measurements, obtained with
 the ELODIE echelle spectrograph at the Haute-Provence
 Observatory, show a main variation with a period of
 28.4 days. Assuming a primary mass of 1.7 $M_{\odot}$, the best
 Keplerian fit to the data leads to a minimum mass of
 25 $M_{\rm{Jup}}$ for the companion (the true mass could be
 significantly higher). We also show that, after subtraction of
 the Keplerian solution from the radial velocity measurements, the
 residual radial velocities are related to phenomena intrinsic to
 the star, namely pulsations with typical periods of γ Dor
 stars. These results show that in some cases, it is possible to
 disentangle radial velocity variations due to a low mass companion
 from variations intrinsic to the observed star.

International audienceWe present the performances of a radial velocity measurement method that we developed for A-F type stars. These perfomances are evaluated through an extensive set of simulations, together with actual radial velocity observations of such stars using the ELODIE and HARPS spectrographs. We report the case of stars constant in radial velocity, the example of a binary detection on HD 48097 (an A2V star, with v sin{i} equal to 90 km s^-1) and a confirmation of the existence of a 3.9 M_Jup planet orbiting around HD 120136 (Tau Boo). The instability strip problem is also discussed. We show that with this method, it is in principle possible to detect planets and brown dwarfs around A-F type stars, thus allowing further study of the impact of stellar masses on planetary system formation over a wider range of stellar masses than is currently done

Queloz, D.

Extrasolar planets and brown dwarfs around A-F type stars. I. Performances of radial velocity measurements, first analyses of variations

Extrasolar planets and brown dwarfs around A-F type stars. II. A planet
  found with ELODIE around the F6V star HD 33564

Extrasolar planets and brown dwarfs around A-F type stars. II. A planet found with ELODIE around the F6V star HD 33564

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Hal - Université Grenoble Alpes

HAL: Hyper Article en Ligne

EDP Sciences OAI-PMH repository (1.2.0)

EDP Sciences OAI-PMH repository (1.2.0)

HAL: Hyper Article en Ligne

HAL: Hyper Article en Ligne