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J/AJ/141/11 Spitzer observations of planet-host stars  (Dodson-Robinson+, 2011)

A Spitzer infrared spectrograph study of debris disks around planet-host stars. Dodson-Robinson S.E., Beichman C.A., Carpenter J.M., Bryden G. <Astron. J., 141, 11 (2011)> =2011AJ....141...11D
ADC_Keywords: Stars, double and multiple ; Planets ; Photometry, infrared Keywords: circumstellar matter - infrared: stars - Kuiper belt: general - planetary systems - planets and satellites: formation Abstract: Since giant planets scatter planetesimals within a few tidal radii of their orbits, the locations of existing planetesimal belts indicate regions where giant planet formation failed in bygone protostellar disks. Infrared observations of circumstellar dust produced by colliding planetesimals are therefore powerful probes of the formation histories of known planets. Here we present new Spitzer infrared spectrograph (IRS) spectrophotometry of 111 solar-type stars, including 105 planet hosts. Our observations reveal 11 debris disks, including two previously undetected debris disks orbiting HD 108874 and HD 130322. Combining the 32um spectrophotometry with previously published MIPS photometry, we find that the majority of debris disks around solar-type stars have temperatures in the range 60≲Tdust≲100K. Assuming a dust temperature Tdust=70K, which is representative of the nine debris disks detected by both IRS and MIPS, debris rings surrounding Sun-like stars orbit between 15 and 240AU depending on the mean particle size. Our observations imply that the planets detected by radial-velocity searches formed within 240AU of their parent stars. If any of the debris disks studied here have mostly large, blackbody emitting grains, their companion giant planets must have formed in a narrow region between the ice line and 15AU. Description: The main sample of extrasolar planetary systems was selected for Spitzer program 40096 (PI: J. Carpenter) from the compilation reported in the Extrasolar Planets Encyclopaedia ( as of 2007 February 16. We also present observations of nine solar-type stars with previously unpublished data from other IRS programs. From IRS program 41 (PI: G. Rieke), we included the planet hosts HD 50554, HD 52265, HD 117176 (70 Vir), and HD 134987, bringing the total number of planet hosts in our sample to 105. Finally, we included the stars without planets HD 166, HD 33262, and HD 33636 from program 41, and HD 105211 and HD 219482 from program 2343 (PI: C. Beichman). Our final sample includes 111 stars, six of which have no detected planets. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 71 112 Observed stellar sample table2.dat 68 111 IRS 30-34um spectrophotometric results refs.dat 101 31 References
See also: J/ApJ/705/1226 : Planet-bearing stars in Spitzer (Bryden+, 2009) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 6 I6 --- HD ? HD number of star 8- 18 A11 --- Name Other name of star 20- 31 A12 --- SpType MK spectral type 33- 36 I4 K Teff Effective temperature 37 A1 --- n_Teff [c] c: based on tabulated values for Teff versus V-K 39- 42 A4 --- r_Teff Reference for Teff, in refs.dat file 46- 50 F5.2 mag Vmag V magnitude 52- 55 F4.1 pc Dist Heliocentric distance 57 I1 --- Pl Number of planets 58 A1 --- u_Pl [d] planet existence under debate (1) 60 A1 --- l_Ld*70 Limit flag on Ld*70 61- 65 F5.2 10-5 Ld*70 ?=- Dust luminosity (Ldust/L*) at 70um 67- 71 A5 --- r_Ld*70 Reference for Ld*70, in refs.dat file
Note (1): Planet's existence under debate; see Eggenberger et al. (2007A&A...466.1179E).
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 6 I6 --- HD ?=- HD number of star 8- 18 A11 --- Name Other name of star 20- 26 F7.2 mJy F* ? 30-34um flux for a perfect photosphere 28- 34 F7.2 mJy Fobs ? Frequency-weighted average observed flux 36- 39 F4.2 --- Sigma ? Dispersion of N=(Fobs-F*)/σ 41- 46 F6.3 --- Fd/F* ? Dust flux to stellar flux ratio (1) 47 A1 --- l_Ld/L* Limit flag on Ld 48- 51 F4.1 10-5 Ld/L* ? Dust luminosity (relative to star luminosity= 53 A1 --- l_Td Limit flag on Ld 54- 56 I3 K Td ? Dust temperature (2) 58- 59 I2 K e_Td ? rms uncertainty on Td 60 A1 --- n_Td [c] Note on Td for HD 219482 (3) 61- 68 A8 --- Tlim Dust temperature interval
Note (1): Upper limits to the dust luminosity are calculated assuming a single-temperature blackbody with Tdust=115K. For cold dust undetected by both MIPS and IRS, the true luminosity ratio may be higher than the value quoted here. See Section 5 for further discussion of the relationship between observed 30-34µm fluxes and grain luminosity. Note (2): Grain temperature estimates are based on the blackbody approximation. For a discussion of temperature as a function of grain size, see Section 6. Note (3): c: Our temperature measurement for the circumstellar dust of HD 219482 agrees with that of Beichman et al. (2006ApJ...652.1674B), who calculated Tdust = 82±3K based on 24 and 70um photometry.
Byte-by-byte Description of file: refs.dat
Bytes Format Units Label Explanations
1- 5 A5 --- Ref Reference code 7- 25 A19 --- BibCode BibCode 27- 47 A21 --- Aut Author's name 49-101 A53 --- Com Comments
History: From electronic version of the journal
(End) Patricia Vannier [CDS] 21-Jul-2012
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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