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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 559410.0, MPI für Astronomie / Publikationen_mpia
First results from Very Large Telescope NACO apodizing phase plate: 4 mm images of the exoplanet b Pictoris b
Authors:Quanz, S. P.; Meyer, M. R.; Kenworthy, M. A.; Girard, J. H. V.; Kasper, M.; Lagrange, A.-M.; Apai, D.; Boccaletti, A.; Bonnefoy, M.; Chauvin, G.; Hinz, P. M.; Lenzen, R.
Date of Publication (YYYY-MM-DD):2010
Journal Abbrev.:The Astrophysical Journal
Issue / Number:1
Start Page:L49
End Page:L53
Audience:Not Specified
Abstract / Description:Direct imaging of exoplanets requires both high contrast and high spatial resolution. Here, we present the first scientific results obtained with the newly commissioned apodizing phase plate coronagraph (APP) on VLT/NACO. We detected the exoplanet β Pictoris b in the narrowband filter centered at 4.05 μm (NB4.05). The position angle (209fdg13 ± 2fdg12) and the projected separation to its host star (0farcs354 ± 0farcs012, i.e., 6.8 ± 0.2 AU at a distance of 19.3 pc) are in good agreement with the recently presented data from Lagrange et al. Comparing the observed NB4.05 magnitude of 11.20 ± 0.23 mag to theoretical atmospheric models, we find a best fit with a 7-10 M Jupiter object for an age of 12 Myr, again in agreement with previous estimates. Combining our results with published L' photometry, we can compare the planet's [L' - NB4.05] color to that of cool field dwarfs of higher surface gravity suggesting an effective temperature of ~1700 K. The best-fit theoretical model predicts an effective temperature of ~1470 K, but this difference is not significant given our photometric uncertainties. Our results demonstrate the potential of NACO/APP for future planet searches and provide independent confirmation as well as complementary data for β Pic b. Based on observations collected at the European Organisation for Astronomical Research in the Southern Hemisphere, Chile, under program number 060.A-9800(J).
Free Keywords:planets and satellites: detection; planets and satellites: formation; stars: formation; stars: pre-main sequence
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
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