J/ApJ/700/1647 Search for planetary companions with Spitzer/IRAC (Marengo+ 2009)
Spitzer/Infrared array camera limits to planetary companions of Fomalhaut and
ε 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 2009ApJ...700.1647M
ADC_Keywords: Photometry, infrared ; Stars, double and multiple ; Stars, nearby
Keywords: infrared: stars - planetary systems - stars: individual (Fomalhaut,
epsilon Eridani)
Abstract:
Fomalhaut and ε 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 3σ model-dependent mass upper
limits of 3MJ (for an age of 200Myr). Around ε Eridani, we
instead set a limit of 4 and ≲1MJ (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 ε 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.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table6.dat 61 22 Fomalhaut 3.6um dropout sources
table7.dat 65 33 ε Eridani 3.6um dropout sources
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See also:
J/ApJ/612/481 : Optical brightness of ε Eri dust ring (Proffitt+,
2004)
Byte-by-byte Description of file: table6.dat table7.dat
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Bytes Format Units Label Explanations
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1- 10 F10.6 deg RAdeg Right ascension in decimal degrees (J2000)
12- 21 F10.6 deg DEdeg Declination in decimal degrees (J2000)
23- 26 I4 AU Dist Distance
28- 32 F5.2 mag [4.5] Spitzer/IRAC 4.5um-band magnitude
34- 37 F4.2 mag e_[4.5] Uncertainty of 4.5um magnitude
39- 43 F5.2 mag [5.8] ? Spitzer/IRAC 5.8um-band magnitude
45- 48 F4.2 mag e_[5.8] ? Uncertainty of 5.8um magnitude
50- 54 F5.2 mag [8.0] ? Spitzer/IRAC 8.0um-band magnitude
56- 59 F4.2 mag e_[8.0] ? Uncertainty of 8.0um magnitude
61- 65 A5 --- Note Note(s) (1)
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Note (1): Notes as follows:
1 = [4.5]-[5.8] or [4.5]-[8.0] color suggest source being a background giant.
2 = Source listed in Table 5, Marengo et al. (2006ApJ...647.1437M 2006ApJ...647.1437M;
<[MMF2006] NN> in Simbad).
3 = Source 11 in Table 3, Marengo et al. (2006ApJ...647.1437M 2006ApJ...647.1437M).
4 = Within field of view, but not detected by Macintosh et al.
(2003ApJ...594..538M 2003ApJ...594..538M; <[MBK2003] eps Eri NN> in Simbad).
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Nomenclature Notes:
Sources are <[MSW2009] DDD.dddddd+DD.dddddd> for Simbad.
History:
From electronic version of the journal
(End) Emmanuelle Perret [CDS] 12-Aug-2011