NOAO >   Observing Info >   Approved Programs >   2011B-0261

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Proposal Information for 2011B-0261


PI: Gaspard Duchene, UC Berkeley (Astronomy), gduchene@berkeley.edu
Address: Department of Astronomy, 601 Campbell Hall #3411, Berkeley, CA 94720-3411, USA

CoI: Catarina Alves de Oliveira, Institut de Planetologie et d'Astrophysique de Grenoble
CoI: Estelle Moraux, Institut de Planetologie et d'Astrophysique de Grenoble
CoI: Jerome Bouvier, Institut de Planetaologie et d'Astrophysique de Grenoble
CoI: Herve Bouy, Centro de Astrobiologa (INTA-CSIC); LAEFF

Title: Towards a complete census of brown dwarfs in IC 348

Abstract: We propose to use GNIRS to perform a near-infrared low resolution spectroscopic follow-up of 13 planetary mass brown dwarf candidates in IC348 (300pc, 3Myr) which have been identified from a wide-field, deep, optical and near-infrared imaging survey with CFHT, as well as one L-type confirmed Taurus member. This proposal is a resubmission of a previously accepted but not executed NIRI program (due to instrument failure). Two (out of 15) of our NIRI targets were observed during the Science Verification of GNIRS (Jan. 2011). Preliminary results place both of them among the coolest known members of IC348 with an estimated mass of about 10 Jupiter masses, confirming the robustness of our photometric selection criteria. With this proposal, we aim at completing our study by observing the remaining candidates. The proposed observations will allow us to confirm the membership of the candidates via the study of spectral youth indicators, to derive the spectral types and reddening, and assess the low mass nature of the confirmed sources by placing them in an H-R diagram. The completion of this project is a fundamental step toward achieving a complete census of the low-mass population in IC348, and constraining the stellar, substellar and planet formation processes.


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