instrumentation: spectrographs; methods: data analysis; techniques: imaging spectroscopy; techniques: radial velocities; stars: individual: HD 142; HIP 70849; GJ 676A; HD 39091; planetary systems; Astrophysics - Earth and Planetary Astrophysics; Astrophysics - Instrumentation and Methods for Astrophysics; Astrophysics - Solar and Stellar Astrophysics
Abstract :
[en] We present observations with the planet finder Spectro-Polarimetric High-contrast Exoplanet REsearch (SPHERE) of a selected sample of the most promising radial velocity (RV) companions for high-contrast imaging. Using a Monte Carlo simulation to explore all the possible inclinations of the orbit of wide RV companions, we identified the systems with companions that could potentially be detected with SPHERE. We found the most favourable RV systems to observe are: HD 142, GJ 676, HD 39091, HIP 70849, and HD 30177 and carried out observations of these systems during SPHERE Guaranteed Time Observing. To reduce the intensity of the starlight and reveal faint companions, we used principal component analysis algorithms alongside angular and spectral differential imaging. We injected synthetic planets with known flux to evaluate the self-subtraction caused by our data reduction and to determine the 5σ contrast in the J band versus separation for our reduced images. We estimated the upper limit on detectable companion mass around the selected stars from the contrast plot obtained from our data reduction. Although our observations enabled contrasts larger than 15 mag at a few tenths of arcsec from the host stars, we detected no planets. However, we were able to set upper mass limits around the stars using AMES-COND evolutionary models. We can exclude the presence of companions more massive than 25-28 M[SUB]Jup[/SUB] around these stars, confirming the substellar nature of these RV companions.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Zurlo, A.; Núcleo de Astronomía, Facultad de Ingeniería y Ciencias, Universidad Diego Portales, Av. Ejercito 441, Santiago, Chile ; Escuela de Ingeniería Industrial, Facultad de Ingeniería y Ciencias, Universidad Diego Portales, Av. Ejercito 441, Santiago, Chile ; Aix Marseille Université, CNRS, LAM - Laboratoire d'Astrophysique de Marseille, UMR 7326, F-13388 Marseille, France
Mesa, D.; INCT, Universidad De Atacama, calle Copayapu 485, Copiapó, Atacama, Chile ; INAF - Osservatorio Astronomico di Padova, Vicolo dell'Osservatorio 5, I-35122 Padova, Italy
Moutou, C.; Aix Marseille Université, CNRS, LAM - Laboratoire d'Astrophysique de Marseille, UMR 7326, F-13388 Marseille, France
Beuzit, J.-L.; Université Grenoble Alpes, IPAG, F-38000 Grenoble, France
Biller, B.; Institute for Astronomy, The University of Edinburgh, Royal Observatory, Blackford Hill, Edinburgh EH9 3HJ, UK
Boccaletti, A.; LESIA, Observatoire de Paris, Université PSL, CNRS, Sorbonne Université, Univ. Paris Diderot, Sorbonne Paris Cité, 5 place Jules Janssen, F-92195 Meudon, France
Bonavita, M.; Institute for Astronomy, The University of Edinburgh, Royal Observatory, Blackford Hill, Edinburgh EH9 3HJ, UK
Bonnefoy, M.; Université Grenoble Alpes, IPAG, F-38000 Grenoble, France
Bhowmik, T.; LESIA, Observatoire de Paris, Université PSL, CNRS, Sorbonne Université, Univ. Paris Diderot, Sorbonne Paris Cité, 5 place Jules Janssen, F-92195 Meudon, France
Brandner, W.; Max-Planck-Institut für Astronomie, Königstuhl 17, D-69117 Heidelberg, Germany
Buenzli, E.; ETH Zurich, Institute for Particle Physics and Astrophysics, Wolfgang-Pauli-Strasse 27, CH-8093 Zurich, Switzerland
Chauvin, G.; Université Grenoble Alpes, IPAG, F-38000 Grenoble, France
Cudel, M.; LESIA, Observatoire de Paris, Université PSL, CNRS, Sorbonne Université, Univ. Paris Diderot, Sorbonne Paris Cité, 5 place Jules Janssen, F-92195 Meudon, France
Feldt, M.; Max-Planck-Institut für Astronomie, Königstuhl 17, D-69117 Heidelberg, Germany
Hagelberg, J.; Observatoire de Genève, University of Geneva, 51 Chemin des Maillettes, CH-1290 Versoix, Switzerland
Janson, M.; Max-Planck-Institut für Astronomie, Königstuhl 17, D-69117 Heidelberg, Germany ; Department of Astronomy, Stockholm University, AlbaNova University Center, SE-106 91 Stockholm, Sweden
Lagrange, A.-M.; Université Grenoble Alpes, IPAG, F-38000 Grenoble, France
Langlois, M.; Aix Marseille Université, CNRS, LAM - Laboratoire d'Astrophysique de Marseille, UMR 7326, F-13388 Marseille, France ; CRAL, UMR 5574, CNRS, Université Lyon 1, 9 avenue Charles André, F-69561 Saint Genis Laval Cedex, France
Lannier, J.; Université Grenoble Alpes, IPAG, F-38000 Grenoble, France
Lavie, B.; Observatoire de Genève, University of Geneva, 51 Chemin des Maillettes, CH-1290 Versoix, Switzerland
Meyer, M.; Department of Astronomy, University of Michigan, 1085 S. University Ave, Ann Arbor, MI 48109-1107, USA
Mouillet, D.; Université Grenoble Alpes, IPAG, F-38000 Grenoble, France
Peretti, S.; Observatoire de Genève, University of Geneva, 51 Chemin des Maillettes, CH-1290 Versoix, Switzerland
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Schmidt, T.; LESIA, Observatoire de Paris, Université PSL, CNRS, Sorbonne Université, Univ. Paris Diderot, Sorbonne Paris Cité, 5 place Jules Janssen, F-92195 Meudon, France
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