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Direct imaging of extra-solar planets in star forming regions: Lessons learned from a false positive around IM Lup

hal.structure.identifierInstitut d'astrophysique spatiale [IAS]
dc.contributor.authorMAWET, Dimitri
hal.structure.identifierInstitut d'Astrophysique et de Géophysique [Liège]
dc.contributor.authorABSIL, Olivier
hal.structure.identifierObservatoire de Haute-Provence [OHP]
dc.contributor.authorMONTAGNIER, Guillaume
hal.structure.identifierLaboratoire d'études spatiales et d'instrumentation en astrophysique [LESIA]
dc.contributor.authorRIAUD, Pierre
hal.structure.identifierInstitut d'Astrophysique et de Géophysique [Liège]
dc.contributor.authorSURDEJ, Jean
dc.contributor.authorDUCOURANT, C.
hal.structure.identifierInstitut de Planétologie et d'Astrophysique de Grenoble [IPAG ]
dc.contributor.authorAUGEREAU, Jean-Charles
dc.contributor.authorROTTINGER, Sarah
hal.structure.identifierEuropean Southern Observatory [ESO]
dc.contributor.authorGIRARD, Julien
dc.contributor.authorKRIST, John
dc.contributor.authorSTAPELFELDT, Karl
dc.date.created2012-07-28
dc.date.issued2012
dc.identifier.issn0004-6361
dc.description.abstractEnMost exoplanet imagers consist of ground-based adaptive optics coronagraphic cameras which are currently limited in contrast, sensitivity and astrometric precision, but advantageously observe in the near-IR (1- 5{\mu}m). Because of these practical limitations, our current observational aim at detecting and characterizing planets puts heavy constraints on target selection, observing strategies, data reduction, and follow-up. Most surveys so far have thus targeted young systems (1-100Myr) to catch the putative remnant thermal radiation of giant planets, which peaks in the near-IR. They also favor systems in the solar neighborhood (d<80pc), which eases angular resolution requirements but also ensures a good knowledge of the distance and proper motion, which are critical to secure the planet status, and enable subsequent characterization. Because of their youth, it is very tempting to target the nearby star forming regions, which are typically twice as far as the bulk of objects usually combed for planets by direct imaging. Probing these interesting reservoirs sets additional constraints that we review in this paper by presenting the planet search that we initiated in 2008 around the disk-bearing T Tauri star IM Lup (Lupus star forming region, 140-190pc). We show and discuss why age determination, the choice of evolutionary model for the central star and the planet, precise knowledge of the host star proper motion, relative or absolute astrometric accuracy, and patience are the key ingredients for exoplanet searches around more distant young stars. Unfortunately, most of the time, precision and perseverance are not paying off: we discovered a candidate companion around IM Lup in 2008, which we report here to be an unbound background object. We nevertheless review in details the lessons learned from our endeavor, and additionally present the best detection limits ever calculated for IM Lup.
dc.language.isoen
dc.publisherEDP Sciences
dc.title.enDirect imaging of extra-solar planets in star forming regions: Lessons learned from a false positive around IM Lup
dc.typeArticle de revue
dc.identifier.doi10.1051/0004-6361/201219662
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.subject.halPhysique [physics]/Astrophysique [astro-ph]/Instrumentation et méthodes pour l'astrophysique [astro-ph.IM]
dc.subject.halPlanète et Univers [physics]/Astrophysique [astro-ph]/Instrumentation et méthodes pour l'astrophysique [astro-ph.IM]
dc.identifier.arxiv1207.6017
bordeaux.journalAstronomy and Astrophysics - A&A
bordeaux.paged.A131
bordeaux.volume544
bordeaux.peerReviewedoui
hal.identifierhal-00832304
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-00832304v1
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=544&amp;rft.spage=d.A131&amp;rft.epage=d.A131&amp;rft.eissn=0004-6361&amp;rft.issn=0004-6361&amp;rft.au=MAWET,%20Dimitri&amp;ABSIL,%20Olivier&amp;MONTAGNIER,%20Guillaume&amp;RIAUD,%20Pierre&amp;SURDEJ,%20Jean&amp;rft.genre=article


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