J/MNRAS/437/391 IR excess in Sun-like stars observed by WISE (Cruz-Saenz+, 2014)
Searching for infrared excesses in Sun-like stars observed by WISE.
Cruz-Saenz De Miera F., Chavez M., Bertone E., Vega O.
<Mon. Not. R. Astron. Soc., 437, 391-396 (2014)>
=2014MNRAS.437..391C 2014MNRAS.437..391C
ADC_Keywords: Stars, dwarfs ; Infrared sources ; Photometry, infrared
Keywords: circumstellar matter - infrared: stars
Abstract:
We present the results of a search for infrared-excess (IR-excess)
candidates in a comprehensive (29000 stars) magnitude-limited sample
of dwarf stars, spanning the spectral range F2-K0, and brighter than
V=15mag. We searched the sample within the WISE all sky survey data
base for objects within 1 arcsec of the coordinates provided by the
SIMBAD data base, and found over 9000 sources detected in all WISE
bands. The sample excludes objects that are flagged as extended
sources and those images that are affected by various optical
artefacts. For each detected object, we compared the observed W4/W2
(22µm/4.6µm) flux ratio with the expected photospheric value and
identified 197 excess candidates at 3σ. For the vast majority of
candidates, the results of this analysis represent the first reported
evidence of an IR excess. Through the comparison with a simple
blackbody emission model, we derive estimates of the dust temperature,
as well as of the dust fractional luminosities. For more than 80
percent of the sample, this temperature is higher than 120K,
suggesting the presence of warm circumstellar dust. Complementary
observations at longer wavelengths (far-IR and submillimetre) are
required for better characterizing and explaining the origin of this
emission.
Description:
The sample was constructed through a selection process that started by
querying the SIMBAD data base for MS stars. We imposed a limiting
magnitude of V=15mag, luminosity class V, and spectral types
between F2 and K0. We also required 2MASS data to be available.
We used the stellar coordinates to identify WISE counterparts.
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
table1.dat 133 197 Subsample of stars with prominent mid-IR excesses
--------------------------------------------------------------------------------
See also:
II/311 : WISE All-Sky Data Release (Cutri+ 2012)
II/328 : AllWISE Data Release (Cutri+ 2013)
Byte-by-byte Description of file: table1.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 23 A23 --- Star Star identifier
24 A1 --- n_Star [*] * indicates a star with previous mid-IR
observations
26- 46 A21 --- STypes Simbad object types
48- 52 F5.2 mag Vmag [7.8/11.6] V magnitude
54- 56 A3 --- SpType Spectral type
58- 61 I4 K Teff Effective temperature (derived from J and Ks)
63- 65 I3 K e_Teff Effective temperature uncertainty
67- 71 F5.2 --- (W3/W2)n [1.1/8.8] Normalized WISE W3/W2 flux ratio
73- 77 F5.2 --- SNR3 [-2.9/63] Signal to noise ratio at W3
79- 83 F5.2 --- (W4/W2)n [1.4/20.4] Normalized WISE W4/W2 flux ratio
85- 89 F5.2 --- SNR4 [3.3/46] Signal to noise ratio at W4
91- 93 I3 K Tdisc Disc temperature
95- 97 I3 K E_Tdisc Disc temperature upper uncertainty
100-102 I3 K e_Tdisc Disc temperature lower uncertainty
105-112 E8.3 --- Fdisc [0/0.1] Disc fractional luminosity
115-122 E8.2 --- E_Fdisc Disc fractional luminosity upper uncertainty
126-133 E8.2 --- e_Fdisc Disc fractional luminosity lower uncertainty
--------------------------------------------------------------------------------
History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 08-Nov-2014