J/ApJ/705/1646 Debris disks in Upper Sco (Carpenter+, 2009)
Debris disks in the upper Scorpius OB association. Carpenter J.M., Mamajek E.E., Hillenbrand L.A., Meyer M.R. <Astrophys. J., 705, 1646-1671 (2009)> =2009ApJ...705.1646C
ADC_Keywords: Associations, stellar ; Photometry, infrared ; Stars, pre-main sequence Keywords: circumstellar matter - open clusters and associations: individual (Upper Scorpius) - planetary systems: formation - planetary systems: protoplanetary disks - stars: pre-main sequence Abstract: We present MIPS 24um and 70um photometry for 205 members of the Upper Scorpius OB Association. These data are combined with published MIPS photometry for 15 additional association members to assess the frequency of circumstellar disks around 5Myr old stars with spectral types between B0 and M5. Twelve stars have a detectable 70um excess, each of which also has a detectable 24um excess. A total of 54 stars are identified with a 24um excess more than 32% above the stellar photosphere. The MIPS observations reveal 19 excess sources - 8 A/F/G stars and 11 K/M stars - that were not previously identified with an 8um or 16um excess. The lack of short-wavelength emission and the weak 24um excess suggests that these sources are debris systems or the remnants of optically thick primordial disks with inner holes. Despite the wide range of luminosities of the stars hosting apparent debris systems, the excess characteristics are consistent with all stars having dust at similar orbital radii after factoring in variations in the radiation blowout particle size with spectral type. The results for Upper Sco are compared to similar photometric surveys from the literature to re-evaluate the evolution of debris emission. Description: The selection criteria for the Upper Sco sample are described in Paper I (Carpenter et al., 2006, Cat J/ApJ/651/L49). In Paper I, IRAC (4.5um and 8um) and IRS peak-up (16um) photometry was presented for 218 of the 220 stars. We present here Spiter/MIPS 24um and 70um photometry for 205 stars observed in Upper Sco. MIPS photometry for the remaining 15 stars are listed in Carpenter et al. (2008ApJS..179..423C). File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 71 205 MIPS 24 and 70 micron photometry table2.dat 81 220 Normalized Flux Ratios
See also: J/MNRAS/374/372 : ZYJHK photometry in Upper Sco (Lodieu+, 2007) J/MNRAS/373/95 : ZYJHK survey of Upper Sco association (Lodieu+, 2006) J/ApJ/651/L49 : Upper Sco OB association IRAC observations (Carpenter+, 2006) J/AJ/124/404 : Upper Scorpius OB association Lithium survey. II. (Preibisch, 2002) J/AJ/121/1040 : PMS members of upper Sco OB association (Preibisch+, 2001) J/A+A/333/619 : Upper Sco OB association Lithium survey (Preibisch+ 1998) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 31 A31 --- Name Source name (1) 33- 39 F7.2 mJy S24 Spitzer/MIPS 24 micron band flux density (2) 41- 45 F5.2 mJy e_S24 The 1σ uncertainty in S24 47- 52 F6.1 mJy S70 Spitzer/MIPS 70 micron band flux density (3) 54- 58 F5.1 mJy e_S70 The 1σ uncertainty in S70 60- 67 I8 --- AORKey Spitzer Astronomical Observation Request (AOR) identification number 69- 71 A3 --- Flags [1-6, ] Flags concerning the photometry (4)
Note (1): Source names with the prefix [PZ99] and [PBB2002] are from Preibisch & Zinnecker (1999AJ....117.2381P) and Preibisch et al. (2002, Cat. J/AJ/124/404) respectively. Note (2): Measured using a flux calibration factor of 0.0447MJy/sr. Note (3): Measured using a flux calibration factor of 702MJy/sr. Note (4): Flag as follows: 1 = 24 micron photometry is unreliable due to bright, extended nebulosity. 2 = 24 micron photometry is unreliable due to nearby star. 3 = Source is extended at 24 micron 4 = 70 micron photometry is unreliable due to contaminating source or nebulosity. 5 = Contaminating source(s) subtracted before 70 micron photometry was measured. 6 = 70 micron photometry measured on AOR 13903104.
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 31 A31 --- Name Source name 33- 40 A8 --- SpType MK spectral type 42 I1 --- r_SpType Reference for SpType (1) 44- 46 F3.1 --- AV The V band extinction 48- 53 F6.2 --- R24 Ratio of 24 micron observed to photospheric flux density 55- 60 F6.1 --- R70 Ratio of 70 micron observed to photospheric flux density 62- 66 F5.1 --- e_R70 The 1σ uncertainty in R70 68 A1 --- E24 [Y]? Excess at 24 micron? 70 A1 --- E70 [Y]? Excess at 70 micron? 72- 81 A10 --- Type Disk type (debris, primordial or Be)
Note (1): Reference as follows: 1 = Houk (Cat. III/80) 2 = Houk & Smith-Moore (Cat. III/133) 3 = Kunkel (1999, PhD thesis, Julius-Maximilians-Universitat Wurzburg); 4 = E. Mamajek, private communication; 5 = Preibisch et al. (1998, Cat. J/A+A/333/619); 6 = Preibisch et al. (2001, Cat. J/AJ/121/1040); 7 = Preibisch et al. (2002, Cat. J/AJ/124/404); 8 = Walter et al. (1994AJ....107..692W).
History: From electronic version of the journal References: Carpenter et al. Paper I. Cat. J/ApJ/651/L49 . 2006ApJ...651L..49C Carpenter et al. Spitzer legacy science database. 2008ApJS..179..423C
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 08-Dec-2011
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