J/ApJ/769/66 The ELM survey. V. White dwarf binaries (Brown+, 2013)
The ELM survey.
V. Merging massive white dwarf binaries.
Brown W.R., Kilic M., Allende Prieto C., Gianninas A., Kenyon S.J.
<Astrophys. J., 769, 66 (2013)>
=2013ApJ...769...66B 2013ApJ...769...66B
ADC_Keywords: Stars, white dwarf ; Radial velocities ; Stars, distances ;
Stars, masses ; Photometry, SDSS
Keywords: binaries: close; Galaxy: stellar content;
stars: individual (SDSS J0751-0141, SDSS J0811+0225);
stars: neutron; white dwarfs
Abstract:
We present the discovery of 17 low-mass white dwarfs (WDs) in
short-period (P≤1 day) binaries. Our sample includes four objects
with remarkable logg≃5 surface gravities and orbital solutions that
require them to be double degenerate binaries. All of the lowest
surface gravity WDs have metal lines in their spectra implying long
gravitational settling times or ongoing accretion. Notably, six of the
WDs in our sample have binary merger times <10Gyr. Four have
≳0.9M☉ companions. If the companions are massive WDs, these
four binaries will evolve into stable mass transfer AM CVn systems and
possibly explode as underluminous supernovae. If the companions are
neutron stars, then these may be millisecond pulsar binaries. These
discoveries increase the number of detached, double degenerate
binaries in the Extremely low mass (ELM) Survey to 54; 31 of these
binaries will merge within a Hubble time.
Description:
Observations were obtained over the course of seven observing runs at
the 6.5m Multiple Mirror Telescope (MMT) between 2011 March and 2013
February.
File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 86 17 Physical parameters of the white dwarf binaries
in the Extremely Low Mass (ELM) Survey
table2.dat 96 17 Binary orbital parameters
table4.dat 34 385 Radial velocity measurements
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See also:
II/294 : The SDSS Photometric Catalog, Release 7 (Adelman-McCarthy+, 2009)
J/A+A/547/A96 : Low-mass He-core WDs seismic properties (Corsico+, 2012)
J/ApJ/751/55 : MMT hypervelocity star survey. II. (Brown+, 2012)
J/ApJ/743/138 : Spectroscopic survey of bright WDs (Gianninas+, 2011)
J/A+A/536/A43 : SDSS WD main-sequence binaries (Nebot Gomez-Moran+, 2011)
J/ApJ/723/1072 : The ELM survey. I. Low-mass white dwarfs (Brown+, 2010)
J/MNRAS/402/620 : SDSS WD main-sequence binaries (Rebassa-Mansergas+, 2010)
J/A+A/513/L7 : Post common envelope binaries from SDSS (Schreiber+, 2010)
J/AJ/136/2070 : SEGUE stellar parameter pipeline III. (Allende Prieto+, 2008)
J/ApJ/671/1708 : Hypervelocity stars. III (Brown+, 2007)
J/ApJ/647/303 : Spectroscopic survey of hypervelocity stars (Brown+, 2006)
J/ApJS/156/47 : DA WDs from the Palomar Green Survey (Liebert+, 2005)
J/AJ/124/1118 : RVs of high-velocity white dwarfs (Silvestri+, 2002)
J/ApJ/419/596 : Pop I UV radiation models (Dorman+, 1993)
http://www.sdss.org/ : SDSS home page
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- Name White dwarf identifier (JHHMM-DDMM)
12- 13 I2 h RAh Hour of right ascension (J2000)
15- 16 I2 min RAm Minute of right ascension (J2000)
18- 23 F6.3 s RAs Second of right ascension (J2000)
25 A1 --- DE- Sign of declination (J2000)
26- 27 I2 deg DEd Degree of declination (J2000)
29- 30 I2 arcmin DEm Arcminute of declination (J2000)
32- 36 F5.2 arcsec DEs Arcsecond of declination (J2000)
38- 42 I5 K Teff [11560/21470] Effective temperature
44- 46 I3 K e_Teff [180/350] Teff uncertainty
48- 52 F5.3 [cm/s2] logg [5/7.8] Surface gravity
54- 58 F5.3 [cm/s2] e_logg [0.04/0.08] logg uncertainty
60- 63 F4.2 Msun Mass [0.1/0.5] Mass of the white dwarf
65- 70 F6.3 mag gmag0 [15.8/20.1] De-reddened g-band magnitude
from SDSS
72- 76 F5.3 mag e_gmag0 [0.01/0.04] gmag0 uncertainty
78- 81 F4.1 mag gMag [6.7/11.2] Absolute g-band magnitude
83- 86 F4.2 kpc Dist [0.1/2.6] Estimated heliocentric distance
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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- 10 A10 --- Name White dwarf identifier (JHHMM+DDMM)
12- 13 I2 --- Nobs [9/35] Number of observations
15- 21 F7.5 d Per [0.04/1.1] Orbital period
23- 29 F7.5 d e_Per Per uncertainty
31- 35 F5.1 km/s K [80.8/432.6] radial velocity semi-amplitude
37- 39 F3.1 km/s e_K [2.3/7.5] K uncertainty
41- 46 F6.1 km/s gamma [-158/78] Systemic velocity γ
48- 50 F3.1 km/s e_gamma [1.2/4.8] gamma uncertainty
52- 61 F10.5 d HJD Time of spectroscopic conjunction; HJD-2450000
63- 69 F7.5 d e_HJD HJD uncertainty
71- 72 A2 --- l_M2 [≥] Limit flag on M2
74- 77 F4.2 Msun M2 [0.1/1.2] Minimum secondary mass
(assuming i=90°)
79- 80 A2 --- l_q [≤] Limit flag on q
82- 86 F5.3 --- q [0.1/0.9] Maximum mass ratio
88- 89 A2 --- l_tau [≤] Limit flag on tau
91- 96 F6.2 Gyr tau [0.1/620] τmerge, maximum merging time
from gravitational wave
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Byte-by-byte Description of file: table4.dat
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Bytes Format Units Label Explanations
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1- 10 A10 --- Name White dwarf identifier (JHHMM+DDMM)
12- 22 F11.6 d HJD Heliocentric Julian Date of observation;
HJD-2450000
24- 29 F6.1 km/s HRV [-404/498] Heliocentric velocity
31- 34 F4.1 km/s e_HRV [3.8/54.4] Uncertainty in HRV
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History:
From electronic version of the journal
References:
Brown et al. Paper I. 2010ApJ...723.1072B 2010ApJ...723.1072B Cat. J/ApJ/723/1072
Kilic et al. Paper II. 2011ApJ...727....3K 2011ApJ...727....3K
Brown et al. Paper III. 2012ApJ...744..142B 2012ApJ...744..142B
Kilic et al. Paper IV. 2012ApJ...751..141K 2012ApJ...751..141K
Gianinas et al. Paper VI. 2015ApJ...812..167G 2015ApJ...812..167G Cat. J/ApJ/812/167
Brown et al. Paper VII. 2016ApJ...818..155B 2016ApJ...818..155B Cat. J/ApJ/818/155
Brown et al. Paper VIII. 2020ApJ...889...49B 2020ApJ...889...49B Cat. J/ApJ/889/49
(End) Greg Schwarz [AAS], Emmanuelle Perret [CDS] 09-Dec-2014