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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 448208.0, MPI für Astronomie / Publikationen_mpia
Spitzer/Infrared Array Camera limits to planetary companions of Fomalhaut and ε Eridani
Authors:Marengo, M.; Stapelfeldt, K.; Werner, M. W.; Hora, J. L.; Fazio, G. G.; Schuster, M. T.; Carson, J. C.; Megeath, S. T.
Date of Publication (YYYY-MM-DD):2009
Title of Journal:The Astrophysical Journal
Journal Abbrev.:ApJ
Issue / Number:2
Start Page:1647
End Page:1657
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:Fomalhaut and epsilon Eridani are two young, nearby stars that possess extended debris disks whose structures suggest the presence of perturbing planetary objects. With its high sensitivity and stable point-spread function, Spitzer/Infrared Array Camera (IRAC) is uniquely capable of detecting cool, Jupiter-like planetary companions whose peak emission is predicted to occur near 4.5 mu m. We report on deep IRAC imaging of these two stars, taken at 3.6 and 4.5 mu m using subarray mode and in all four channels in wider-field full array mode. Observations acquired at two different telescope roll angles allowed faint surrounding objects to be separated from the stellar diffraction pattern. No companion candidates were detected at the reported position of Fomalhaut b with 3 sigma model-dependent mass upper limits of 3M(J) (for an age of 200 Myr). Around epsilon Eridani, we instead set a limit of 4 and less than or similar to 1M(J) (1 Gyr model age) at the inner and outer edge of the submillimeter debris ring, respectively. These results are consistent with non-detections in recent near-infrared imaging searches, and set the strongest limits to date on the presence of planets outside epsilon Eridani submillimeter ring.
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:ISSN:0004-637X %R 10.1088/0004-637x/700/2/1647 [ID No:1]
URL:<Go to ISI>://WOS:000268098100058 [ID No:2]
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