J/MNRAS/462/2506 White dwarf candidates in DECam first field (Belardi+, 2016)
The DECam Minute Cadence Survey. I.
Belardi C., Kilic M., Munn J.A., Gianninas A., Barber S.D., Dey A.,
Stetson P.B.
<Mon. Not. R. Astron. Soc., 462, 2506-2517 (2016)>
=2016MNRAS.462.2506B 2016MNRAS.462.2506B (SIMBAD/NED BibCode)
ADC_Keywords: Surveys ; Stars, white dwarf ; Photometry, SDSS ; Stars, ages ;
Stars, distances
Keywords: techniques: photometric; eclipses; white dwarfs
Abstract:
We present the first results from a minute cadence survey of a 3deg2
field obtained with the Dark Energy Camera. We imaged part of the
Canada-France-Hawaii Telescope Legacy Survey area over eight
half-nights. We use the stacked images to identify 111 high proper
motion white dwarf candidates with g≤24.5mag and search for
eclipse-like events and other sources of variability. We find a new
g=20.64mag pulsating ZZ Ceti star with pulsation periods of 11-13min.
However, we do not find any transiting planetary companions in the
habitable zone of our target white dwarfs. Given the probability of
eclipses of 1 per cent and our observing window from the ground, the
non-detection of such companions in this first field is not
surprising. Minute cadence DECam observations of additional fields
will provide stringent constraints on the frequency of planets in the
white dwarf habitable zone.
Description:
We used DECam mounted on the Blanco 4m Telescope on UT 2014 Feb 2-9 to
obtain g-band exposures of a three square degree field
(corresponding to a single DECam pointing) centred at Right Ascension
RA=09:03:02 and Declination DE=-04:35:00. Our observations were
performed under the NOAO program 2014A-0073. This field was previously
observed by the Canada-France-Hawaii Telescope Legacy Survey (CFHTLS1)
between 2003 and 2008, and is part of the CFHTLS Wide 2 field, which
is a 25 square degree field with MegaCam ugriz photometry available.
The earlier MegaCam data provide the first epoch for our proper motion
measurements.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 94 78 Astrometry and photometry of the good white
dwarf candidates in the first field
table2.dat 94 33 Astrometry and photometry of the "maybe" white
dwarf candidates in the first field
table3.dat 31 78 *Physical parameters of the good white dwarf
candidates in the first field
table4.dat 31 33 *Physical parameters of the "maybe" white dwarf
candidates in the first field
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Note on table3.dat and table4.dat: we assume a surface gravity of logg=8.
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Byte-by-byte Description of file: table1.dat table2.dat
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Bytes Format Units Label Explanations
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1- 5 A5 --- Name Target name (WDNNN)
7- 16 F10.6 deg RAdeg Right ascension (J2000)
18- 26 F9.6 deg DEdeg Declination (J2000)
28- 32 F5.2 mag umag SDSS u magnitude
34- 37 F4.2 mag e_umag rms uncertainty in umag
39- 43 F5.2 mag gmag SDSS g magnitude
45- 48 F4.2 mag e_gmag rms uncertainty in gmag
50- 54 F5.2 mag rmag SDSS r magnitude
56- 59 F4.2 mag e_rmag rms uncertainty in rmag
61- 65 F5.2 mag imag SDSS i magnitude
67- 70 F4.2 mag e_imag rms uncertainty in imag
72- 76 F5.2 mag zmag SDSS z magnitude
78- 81 F4.2 mag e_zmag rms uncertainty in zmag
83- 87 F5.1 mas/yr pmRA Proper motion along RA
89- 94 F6.1 mas/yr pmDE Proper motion along RA
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Byte-by-byte Description of file: table3.dat table4.dat
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Bytes Format Units Label Explanations
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1- 5 A5 --- Name Target name
7- 11 I5 K Teff Effective temperature
13- 16 I4 K e_Teff rms uncertainty on Teff
18- 21 I4 pc Dist Distance
23- 26 F4.2 Gyr Age Age
28- 31 I4 km/s Vtan Tangential velocity
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History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 08-Feb-2018