Upper limits for mass and radius of objects around proxima cen from SPHERE/VLT
Author
dc.contributor.author
Mesa, D.
Author
dc.contributor.author
Zurlo, A.
Author
dc.contributor.author
Milli, J.
Author
dc.contributor.author
Gratton, R.
Author
dc.contributor.author
Avenhaus, H.
Admission date
dc.date.accessioned
2018-07-13T16:32:20Z
Available date
dc.date.available
2018-07-13T16:32:20Z
Publication date
dc.date.issued
2017
Cita de ítem
dc.identifier.citation
Monthly Notices of The Royal Astronomical Society 466, L118–L122 (2017)
es_ES
Identifier
dc.identifier.other
10.1093/mnrasl/slw241
Identifier
dc.identifier.uri
https://repositorio.uchile.cl/handle/2250/149857
Abstract
dc.description.abstract
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 similar to 6-7 M-Jup 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 M-Jup 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.
es_ES
Patrocinador
dc.description.sponsorship
'Progetti Premiali' funding scheme of MIUR
French ANR through the GUEPARD project
ANR10-BLANC0504-01
EU through ERC
279973
GIPSE grant
ANR-14-CE33-0018
FONDECYT
3150643
Millennium Science Initiative (Chilean Ministry of Economy)
RC130007
ESO
CNRS (France)
MPIA (Germany)
INAF (Italy)
FINES (Switzerland)
NOVA (Netherlands)
European Commission Sixth Framework Programme as part of the Optical Infrared Coordination Network for Astronomy (OPTICON)
RII3-Ct-2004-001566
European Commission Seventh Framework Programme as part of the Optical Infrared Coordination Network for Astronomy (OPTICON)
226604
312430
Swiss National Science Foundation
SNSF