J/MNRAS/459/1415 Bright white dwarfs IRAC photometry (Barber+, 2016)
Remnant planetary systems around bright white dwarfs.
Barber S.D., Belardi C., Kilic M., Gianninas A.
<Mon. Not. R. Astron. Soc., 459, 1415-1421 (2016)>
=2016MNRAS.459.1415B 2016MNRAS.459.1415B (SIMBAD/NED BibCode)
ADC_Keywords: Stars, white dwarf ; Photometry, millimetric/submm
Keywords: white dwarfs - infrared: planetary systems - infrared: stars
Abstract:
We cross-correlate several sources of archival photometry for 1265
bright (V∼16mag) white dwarfs (WDs) with available high
signal-to-noise spectroscopy. We find 381 WDs with archival
Spitzer+IRAC data and investigate this subsample for infrared excesses
due to circumstellar dust. This large data set reveals 15 dusty WDs,
including three new debris discs and the hottest WD known to host dust
(WD 0010+280). We study the frequency of debris discs at WDs as
function of mass. The frequency peaks at 12.5 per cent for
0.7-0.75M☉ WDs (with 3M☉ main-sequence star
progenitors) and falls off for stars more massive than this, which
mirrors predicted planet occurrence rates for stars of different
masses.
Description:
Mid-infrared photometry, like the 3.4 and 4.6um photometry available
from WISE, is necessary to detect emission from a debris disc orbiting
a WD. WISE, however, has poor spatial resolution (6 arcsec beam size)
and is known to have a 75 per cent false positive rate for detecting
dusty discs around WDs fainter than 14.5(15) mag in W1(W2) (Barber et
al. (2014ApJ...786...77B 2014ApJ...786...77B). To mitigate this high rate of spurious
detections, we compile higher spatial resolution archival data from
the InfraRed Array Camera (IRAC) on the Spitzer Space Telescope. We
query the Spitzer Heritage Archive for any observations within 10
arcsec of the 1265 WDs from Gianninas et al. (2011, Cat.
J/ApJ/743/138) and find 907 Astronomical Observing Requests (AORs) for
381 WDs.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table3.dat 67 381 IRAC Ch 1-4 photometry
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See also:
J/ApJ/657/1013 : 2MASS/Spitzer white dwarfs IR photometry (Tremblay+, 2007)
J/MNRAS/417/1210 : DA-white dwarfs from SDSS and UKIDSS (Girven+, 2011)
J/ApJ/760/26 : DA white dwarfs infrared photometry (Barber+, 2012)
J/AJ/146/34 : LAMOST DA white dwarfs infrared photometry (Zhang+, 2013)
J/ApJ/743/138 : Bright white dwarfs spectroscopic survey (Gianninas+, 2011)
Byte-by-byte Description of file: table3.dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- WD WD name (HHMM+DDd or HHMM+DDd.N)
12- 18 F7.3 mJy F3.6um ?=- Flux density at 3.6um
20- 24 F5.3 mJy e_F3.6um ?=- rms uncertainty on F3.6um
26- 32 F7.3 mJy F4.5um ?=- Flux density at 4.5um
34- 38 F5.3 mJy e_F4.5um ?=- rms uncertainty on F4.5um
40- 47 F8.3 mJy F5.8um ?=- Flux density at 5.8um
49- 53 F5.3 mJy e_F5.8um ?=- rms uncertainty on F5.8um
55- 61 F7.3 mJy F8.0um ?=- Flux density at 8.0um
63- 67 F5.3 mJy e_F8.0um ?=- rms uncertainty on F8.0um
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 28-Jul-2017