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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents



ID: 742549.0, MPI für Astronomie / Publikationen_mpia
Upper limits for mass and radius of objects around Proxima Cen from SPHERE/VLT
Authors:Mesa, D.; Zurlo, A.; Milli, J.; Gratton, R.; Desidera, S.; Langlois, M.; Vigan, A.; Bonavita, M.; Antichi, J.; Avenhaus, H.; Baruffolo, A.; Biller, B.; Boccaletti, A.; Bruno, P.; Cascone, E.; Chauvin, G.; Claudi, R. U.; De Caprio, V.; Fantinel, D.; Farisato, G.; Girard, J.; Giro, E.; Hagelberg, J.; Incorvaia, S.; Janson, M.; Kral, Q.; Lagadec, E.; Lagrange, A. -. M.; Lessio, L.; Meyer, M.; Peretti, S.; Perrot, C.; Salasnich, B.; Schlieder, J.; Schmid, H. -. M.; Scuderi, S.; Sissa, E.; Thalmann, C.; Turatto, M.
Date of Publication (YYYY-MM-DD):2017
Title of Journal:Monthly Notices of the Royal Astronomical Society
Volume:466
Issue / Number:1
Start Page:L118
End Page:L122
Audience:Not Specified
Abstract / Description:The recent discovery of an earth-like planet around Proxima Centauri has drawn much attention to this star and its environment. We performed a series of observations of Proxima Centauri using Spectro-Polarimetric High-contrast Exoplanet REsearch (SPHERE), the planet-finder instrument installed at the European Southern Observatory (ESO) Very Large Telescope (VLT) UT3, using its near-infrared modules, InfraRed Dual-band Imager and Spectrograph (IRDIS) and IFS. No planet was detected directly, but we set upper limits on the mass up to 7 au by exploiting the AMES-COND models. Our IFS observations reveal that no planet more massive than ∼6-7 MJup can be present within 1 au. The dual-band imaging camera IRDIS also enables us to probe larger separations than other techniques such as radial velocity or astrometry. We obtained mass limits of the order of 4 MJup at separations of 2 au or larger, representing the most stringent mass limits at separations larger than 5 au available at the moment. We also made an attempt to estimate the radius of possible planets around Proxima using the reflected light. Since the residual noise for the observations is dominated by photon noise and thermal background, longer exposures in good observing conditions could improve the achievable contrast limit further.
Free Keywords:instrumentation: spectrographs; methods: data analysis; techniques: imaging spectroscopy; stars: individual: Proxima Centauri; planetary systems
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:ISSN:0035-8711 %R 10.1093/mnrasl/slw241
URL:http://adsabs.harvard.edu/abs/2017MNRAS.466L.118M
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