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Hot circumstellar material resolved around beta Pic with VLTI/PIONIER

dc.contributor.authorDEFRÈRE, D.
hal.structure.identifierInstitut de Planétologie et d'Astrophysique de Grenoble [IPAG ]
dc.contributor.authorLEBRETON, J.
hal.structure.identifierInstitut de Planétologie et d'Astrophysique de Grenoble [IPAG ]
dc.contributor.authorBOUQUIN, J. -B. Le
hal.structure.identifierInstitut de Planétologie et d'Astrophysique de Grenoble [IPAG ]
dc.contributor.authorLAGRANGE, A. -M.
hal.structure.identifierUniversité de Liège
dc.contributor.authorABSIL, O.
hal.structure.identifierInstitut de Planétologie et d'Astrophysique de Grenoble [IPAG ]
dc.contributor.authorAUGEREAU, J. -C.
hal.structure.identifierEuropean Southern Observatory [ESO]
dc.contributor.authorBERGER, J. -P.
hal.structure.identifierAMOR 2012
dc.contributor.authorDI FOLCO, E.
dc.contributor.authorERTEL, S.
hal.structure.identifierInstitut de Planétologie et d'Astrophysique de Grenoble [IPAG ]
dc.contributor.authorKLUSKA, J.
hal.structure.identifierEuropean Southern Observatory [ESO]
dc.contributor.authorMONTAGNIER, G.
hal.structure.identifierNASA ExoPlanet Science Institute [NExScI]
dc.contributor.authorMILLAN-GABET, R.
hal.structure.identifierJet Propulsion Laboratory [JPL]
dc.contributor.authorTRAUB, W.
hal.structure.identifierInstitut de Planétologie et d'Astrophysique de Grenoble [IPAG ]
dc.contributor.authorZINS, G.
dc.date.created2012-10-08
dc.date.issued2012
dc.identifier.issn0004-6361
dc.description.abstractEnWe aim at resolving the circumstellar environment around beta Pic in the near-infrared in order to study the inner planetary system (< 200 mas, i.e., ~4 AU). Precise interferometric fringe visibility measurements were obtained over seven spectral channels dispersed across the H band with the four-telescope VLTI/PIONIER interferometer. Thorough analysis of interferometric data was performed to measure the stellar angular diameter and to search for circumstellar material. We detected near-infrared circumstellar emission around beta Pic that accounts for 1.37% +/- 0.16% of the near-infrared stellar flux and that is located within the field-of-view of PIONIER (i.e., ~200 mas in radius). The flux ratio between this excess and the photosphere emission is shown to be stable over a period of 1 year and to vary only weakly across the H band, suggesting that the source is either very hot (> 1500 K) or dominated by the scattering of the stellar flux. In addition, we derived the limb-darkened angular diameter of beta Pic with an unprecedented accuracy (theta_LD= 0.736 +/- 0.019 mas). The presence of a small H-band excess originating in the vicinity of beta Pic is revealed for the first time thanks to the high-precision visibilities enabled by VLTI/PIONIER. This excess emission is likely due to the scattering of stellar light by circumstellar dust and/or the thermal emission from a yet unknown population of hot dust, although hot gas emitting in the continuum cannot be firmly excluded.
dc.language.isoen
dc.publisherEDP Sciences
dc.title.enHot circumstellar material resolved around beta Pic with VLTI/PIONIER
dc.typeArticle de revue
dc.identifier.doi10.1051/0004-6361/201220287
dc.subject.halPhysique [physics]/Astrophysique [astro-ph]/Astrophysique stellaire et solaire [astro-ph.SR]
dc.subject.halPlanète et Univers [physics]/Astrophysique [astro-ph]/Astrophysique stellaire et solaire [astro-ph.SR]
dc.subject.halPhysique [physics]/Astrophysique [astro-ph]/Planétologie et astrophysique de la terre [astro-ph.EP]
dc.subject.halPlanète et Univers [physics]/Astrophysique [astro-ph]/Planétologie et astrophysique de la terre [astro-ph.EP]
dc.identifier.arxiv1210.1914
bordeaux.journalAstronomy and Astrophysics - A&A
bordeaux.pageid.L9
bordeaux.volume546
bordeaux.peerReviewedoui
hal.identifierhal-00832266
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-00832266v1
bordeaux.COinSctx_ver=Z39.88-2004&amp;rft_val_fmt=info:ofi/fmt:kev:mtx:journal&amp;rft.jtitle=Astronomy%20and%20Astrophysics%20-%20A&A&amp;rft.date=2012&amp;rft.volume=546&amp;rft.spage=id.L9&amp;rft.epage=id.L9&amp;rft.eissn=0004-6361&amp;rft.issn=0004-6361&amp;rft.au=DEFR%C3%88RE,%20D.&amp;LEBRETON,%20J.&amp;BOUQUIN,%20J.%20-B.%20Le&amp;LAGRANGE,%20A.%20-M.&amp;ABSIL,%20O.&amp;rft.genre=article


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