J/MNRAS/422/2600 KOI-74 radial velocities and fluxes (Bloemen+, 2012)
Mass ratio from Doppler beaming and Romer delay versus ellipsoidal modulation
in the Kepler data of KOI-74.
Bloemen S., Marsh T.R., Degroote P., Ostensen R.H., Papics P.I., Aerts C.,
Koester D., Gansicke B.T., Breedt E., Lombaert R., Pyrzas S.,
Copperwheat C.M., Exter K., Raskin G., Van Winckel H., Prins S.,
Pessemier W., Fremat Y., Hensberge H., Jorissen A., Van Eck S.
<Mon. Not. R. Astron. Soc., 422, 2600-2608 (2012)>
=2012MNRAS.422.2600B 2012MNRAS.422.2600B
ADC_Keywords: Binaries, eclipsing ; Radial velocities
Keywords: binaries: close - binaries: eclipsing - stars: individual: KOI-74
Abstract:
We present a light-curve analysis and radial velocity study of KOI-74,
an eclipsing A star + white dwarf binary with a 5.2-d orbit. Aside
from new spectroscopy covering the orbit of the system, we used 212-d
of publicly available Kepler observations and present the first
complete light-curve fitting to these data, modelling the eclipses and
transits, ellipsoidal modulation, reflection and Doppler beaming.
Markov chain Monte Carlo simulations are used to determine the system
parameters and uncertainty estimates.
Description:
To determine the spectral type, the rotational velocity and the radial
velocity amplitude of the primary, we obtained 46 high-resolution
(R∼85000) echelle spectra using the HERMES spectrograph at the 1.2-m
Mercator telescope (La Palma, Canary Islands). These were reduced
using the standard instrument-specific data reduction pipeline.
Additionally, we obtained 29 spectra with the ISIS spectrograph
mounted on the 4.2-m William Herschel Telescope (La Palma, Canary
Islands).
The Kepler data from Q0 (quarter 0), Q1, Q2 and Q3 were retrieved from
the public archive (http://archive.stsci.edu/kepler/). The data span
229-d, resulting in a data set of 212-d of observations excluding the
gaps.
Objects:
-----------------------------------------------------
RA (2000) DE Designation(s)
-----------------------------------------------------
19 53 17.81 +42 23 18.5 KOI-74 = NAME Kepler-74
-----------------------------------------------------
File Summary:
--------------------------------------------------------------------------------
FileName Lrecl Records Explanations
--------------------------------------------------------------------------------
ReadMe 80 . This file
hbalmer.dat 38 46 Radial velocity measurements from Balmer lines at
4102, 4340 and 4861Å in Hermes@Mercator spectra
hmgii.dat 38 46 Radial velocity measurements from MgII line
in Hermes@Mercator spectra
ibalmer.dat 38 29 Radial velocity measurements from Balmer lines at
4102, 4340 and 4861Å in ISIS@WHT spectra
imgii.dat 38 29 Radial velocity measurements from the MgII line
in ISIS@WHT spectra
detrend.dat 50 28086 *Light curve of KOI-74. Data of quarters Q0, Q1,
Q2 and Q3 were used
folded.dat 46 1717 *Phase-folded light curve
--------------------------------------------------------------------------------
Note on detrend.dat: Detrending is performed as described in the paper.
Note on folded.dat: Short cadence data of Q2.3 and Q3 were first detrended
and then folded on the orbital period.
--------------------------------------------------------------------------------
See also:
V/133 : Kepler Input Catalog (Kepler Mission Team, 2009)
Byte-by-byte Description of file: ?balmer.dat ?mgii.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 14 F14.6 d BJD Barycentric Julian date
20- 23 I4 s Int Integration time
26- 31 F6.2 km/s RV Radial velocity
34- 38 F5.2 km/s e_RV Uncertainty on radial velocity
--------------------------------------------------------------------------------
Byte-by-byte Description of file: detrend.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 13 F13.7 d MJD Modified Julian date
16- 22 F7.5 d Int Integration time
25- 33 F9.7 --- NFlux Normalised flux
36- 44 F9.7 --- e_NFlux Error on normalized flux
47 I1 --- Weigth weight of datapoint in MCMC
49- 50 I2 --- Over oversampling in time
--------------------------------------------------------------------------------
Byte-by-byte Description of file: folded.dat
--------------------------------------------------------------------------------
Bytes Format Units Label Explanations
--------------------------------------------------------------------------------
1- 9 F9.7 --- Phase [0/1] Orbital phase
12- 18 F7.5 --- Int Integration time (in terms of orbital phase)
21- 29 F9.7 --- NFlux Normalised flux
32- 40 F9.7 --- e_NFlux Error on normalized flux
43 I1 --- Weight Weight of datapoint in MCMC
46 I1 --- Over Oversampling in time
--------------------------------------------------------------------------------
History:
From electronic version of the journal
(End) Patricia Vannier [CDS] 15-Jan-2013