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J/ApJ/700/1647 Spitzer limits to planetary companions (Marengo+, 2009)
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Beginning of ReadMe :J/ApJ/700/1647 Search for planetary companions with Spitzer/IRAC (Marengo+ 2009)
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Spitzer/Infrared array camera limits to planetary companions of Fomalhaut and
epsilon Eridani.
Marengo M., Stapelfeldt K., Werner M.W., Hora J.L., Fazio G.G.,
Schuster M.T., Carson J.C., Megeath S.T.
<Astrophys. J., 700, 1647-1657 (2009)>
=2009ApJ...700.1647M
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ADC_Keywords: Photometry, infrared ; Stars, double and multiple ; Stars, nearby
Keywords: infrared: stars - planetary systems - stars: individual (Fomalhaut,
epsilon Eridani)
Abstract:
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 4.5um. We report on
deep IRAC imaging of these two stars, taken at 3.6 and 4.5um 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 3sigma model-dependent mass upper
limits of 3M_J_ (for an age of 200Myr). Around epsilon Eridani, we
instead set a limit of 4 and < 1M_J_ (1Gyr 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.
Description:
Observations with Spitzer/IRAC in 3.6, 4.5 and 5.8, 8.0um were obtained
during eight date between the JD 2453014.336 and 2454356.699.