J/ApJ/753/147 Herschel observations stars in THA (Donaldson+, 2012)
Herschel PACS observations and modeling of debris disks in the
Tucana-Horologium Association.
Donaldson J.K., Roberge A., Chen C.H., Augereau J.-C., Dent W.R.F.,
Eiroa C., Krivov A.V., Mathews G.S., Meeus G., Menard F.,
Riviere-Marichalar P., Sandell G.
<Astrophys. J., 753, 147 (2012)>
=2012ApJ...753..147D 2012ApJ...753..147D
ADC_Keywords: Associations, stellar ; Photometry, infrared ; Stars, dwarfs ;
Effective temperatures
Keywords: circumstellar matter; infrared: stars
Abstract:
We present Herschel PACS photometry of 17 B- to M-type stars in the
30Myr old Tucana-Horologium Association. This work is part of the
Herschel Open Time Key Programme "Gas in Protoplanetary Systems"
(GASPS). 6 of the 17 targets were found to have infrared excesses
significantly greater than the expected stellar IR fluxes, including a
previously unknown disk around HD30051. These six debris disks were
fitted with single-temperature blackbody models to estimate the
temperatures and abundances of the dust in the systems. For the five
stars that show excess emission in the Herschel PACS photometry and
also have Spitzer IRS spectra, we fit the data with models of
optically thin debris disks with realistic grain properties in order
to better estimate the disk parameters. The model is determined by a
set of six parameters: surface density index, grain size distribution
index, minimum and maximum grain sizes, and the inner and outer radii
of the disk. The best-fitting parameters give us constraints on the
geometry of the dust in these systems, as well as lower limits to the
total dust masses. The HD105 disk was further constrained by fitting
marginally resolved PACS 70µm imaging.
Description:
In this paper, we present results of a sensitive Herschel debris disk
survey in the 30Myr old Tucana-Horologium Association. We obtained
Herschel PACS photometry of the 17 GASPS ("Gas in Protoplanetary
Systems" program) targets in the Tucana-Horologium Association. We
also obtained PACS spectra for two of the targets. Previously
unpublished Spitzer IRS spectra for three targets are presented.
The stellar properties of the 17 Tucana-Horologium stars observed are
listed in Table 1. PACS scan map observations were obtained for all 17
Tucana-Horologium targets at 70 and 160um. Additional observations at
100um were taken for five targets.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 59 17 Stellar properties in the 30 Myr old
Tucana-Horologium Association
table2.dat 76 17 Herschel PACS photometry results
table6.dat 100 168 Archive data used in SED fitting
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See also:
VI/139 : Herschel Observation Log (Herschel Science Centre, 2013)
II/298 : AKARI/FIS All-Sky Survey Point Source Catalogues (ISAS/JAXA, 2010)
II/246 : 2MASS All-Sky Catalog of Point Sources (Cutri+ 2003)
I/259 : The Tycho-2 Catalogue (Hog+ 2000)
J/PASP/125/477 : Gas Survey of Protoplanetary Systems. I. (Dent+, 2013)
J/ApJ/750/98 : 24um observations of AFGKM stars of 3 clusters (Urban+, 2012)
J/AJ/144/135 : Spitzer 24µm phot. of Hipparcos F stars (Mizusawa+, 2012)
J/ApJ/700/L73 : Photospheric fluxes at 24 and 70µm (Kospal+, 2009)
J/ApJ/705/1646 : Debris disks in Upper Sco (Carpenter+, 2009)
J/ApJS/179/451 : Predicted IR excesses for protoplanetary disks (Kenyon+, 2008)
J/ApJ/660/1556 : Characterization of dusty debris disks (Rhee+, 2007)
J/ApJ/636/1098 : Debris disks around solar-type stars (Bryden+, 2006)
J/PASP/118/1690 : Spitzer solar-type stars list (Meyer+, 2006)
J/A+A/460/695 : Search for Associations Containing Young stars (Torres+, 2006)
J/other/ARA+A/42.685 : Young stars near the Sun (Zuckerman+, 2004)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 11 A11 --- Name Star name
13 A1 --- f_Name [d] d: binary or multiple star system
15- 16 I2 h RAh Hour of right ascension (J2000)
18- 19 I2 min RAm Minute of right ascension (J2000)
21- 25 F5.2 s RAs Second of right ascension (J2000)
27 A1 --- DE- Sign of declination (J2000)
28- 29 I2 deg DEd Degree of declination (J2000)
31- 32 I2 arcmin DEm Arcminute of declination (J2000)
34- 38 F5.2 arcsec DEs Arcsecond of declination (J2000)
40- 47 A8 --- SpT SIMBAD MK spectral type
49- 53 I5 K T* [3400/11250] Temperature calculated from
stellar modeling (see section 3)
55- 56 I2 pc Dist [25/64] Distance from the Hipparcos catalog
(Perryman & ESA 1997, Cat. I/239)
58- 59 I2 pc e_Dist [1/10]? Dist uncertainty
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Byte-by-byte Description of file: table2.dat
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Bytes Format Units Label Explanations
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1- 3 A3 --- Class DD=debris disks or NEs=non-excess stars
5- 15 A11 --- Name Star name
17 A1 --- l_F70 Limit flag on F70um
19- 23 F5.1 mJy F70 Observed Herschel/PACS 70um flux
25- 27 F3.1 mJy e_F70 ? F70um uncertainty (1)
29- 32 F4.1 mJy F70e 70um expected stellar flux (2)
34- 36 I3 s t70 On-source time for 70µm observations
38 A1 --- l_F100 Limit flag on F100um
40- 44 F5.1 mJy F100 ? Observed Herschel/PACS 100µm flux
46- 48 F3.1 mJy e_F100 ? F100um uncertainty (1)
50- 52 F3.1 mJy F100e ? 100um expected stellar flux (2)
54- 56 I3 s t100 ? On-source time for 100um obs.
58 A1 --- l_F160 Limit flag on F160um
60- 63 F4.1 mJy F160 Observed Herschel/PACS 160µm flux
65- 68 F4.1 mJy e_F160 ? F160um uncertainty (1)
70- 72 F3.1 mJy F160e 160um expected stellar flux (2)
74- 76 I3 s t160 On-source time for 160um observations
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Note (1): 1σ uncertainties include statistical and systematic errors
added in quadrature.
Note (2): The expected stellar fluxes at the PACS wavelengths were calculated
by fitting the optical and near-IR data with NextGen stellar
atmosphere models (Hauschildt et al. 1999ApJ...512..377H 1999ApJ...512..377H).
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Byte-by-byte Description of file: table6.dat
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Bytes Format Units Label Explanations
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1- 11 A11 --- Name Star name
13- 24 A12 --- Syst System (Hipparcos or Zeiss/FOTRAP, 2MASS,
Spitzer, IRAS, WISE and AKARI)
26- 36 A11 --- Band Band (BV (Johnson), JHK_s, IRAC1-4, MIPS 24,
IRS, IRAS 12, IRAS, W1-4, L18W and S9W)
38- 42 F5.2 um lambda [0.44/24] Wavelength λ (or lower
wavelength range if lam2 is filled)
44- 45 I2 um lam2 [37]? Upper wavelength range
47- 54 F8.2 mJy Flux [7.8/95730]? Observed flux in band
56- 63 F8.3 mJy e_Flux [0.2/8003]? Uncertainty in Flux
65- 80 A16 --- Auth First author's name (or "This work")
82-100 A19 --- BibCode Bibcode for the reference
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History:
From electronic version of the journal
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 18-Feb-2014