J/ApJ/836/124 2yrs of eclipse data & precise RVs for LP661-13 (Dittmann+, 2017)
Discovery and precise characterization by the MEarth project of LP 661-13,
an eclipsing binary consisting of two fully convective low-mass stars.
Dittmann J.A., Irwin J.M., Charbonneau D., Berta-Thompson Z.K.,
Newton E.R., Latham D.W., Latham C.A., Esquerdo G., Berlind P.,
Calkins M.L.
<Astrophys. J., 836, 124-124 (2017)>
=2017ApJ...836..124D 2017ApJ...836..124D (SIMBAD/NED BibCode)
ADC_Keywords: Binaries, eclipsing ; Photometry, RI ; Radial velocities
Keywords: binaries: eclipsing; solar neighborhood; stars: fundamental parameters
stars: individual: LP 661-13; stars: low-mass
Abstract:
We report the detection of stellar eclipses in the LP 661-13 system.
We present the discovery and characterization of this system,
including high-resolution spectroscopic radial velocities and a
photometric solution spanning two observing seasons. LP 661-13 is a
low-mass binary system with an orbital period of
4.7043512-0.0000010+0.0000013d at a distance of 24.9±1.3pc.
LP661-13A is a 0.30795±0.00084M☉ star, while LP661-13B is a
0.19400±0.00034M☉ star. The radius of each component is
0.3226±0.0033R☉ and 0.2174±0.0023R☉, respectively. We
detect out-of-eclipse modulations at a period slightly shorter than
the orbital period, implying that at least one of the components is
not rotating synchronously. We find that each component is slightly
inflated compared to stellar models, and that this cannot be
reconciled through age or metallicity effects. As a nearby eclipsing
binary system, where both components are near or below the
full-convection limit, LP 661-13 will be a valuable test of models for
the structure of cool dwarf stars.
Description:
MEarth-south, like its northern counterpart, consists of eight f/9
40cm Ritchey-Chretien telescopes on German equatorial mounts. The
telescopes are located at the Cerro-Tololo International Observatory
(CTIO) in Chile. The telescopes are automated and take data on every
clear night.
We obtained RV measurements with the Tillinghast Reflector Echelle
Spectrograph (TRES) on the 1.5m Tillinghast reflector located at the
Fred Lawrence Whipple Observatory (FLWO) on Mt. Hopkins, Arizona
(R=44000). We obtained 14 observations of LP 661-13 with TRES, with
eight exposures taken in the 2014 observing season (2014 February
18-2014 March 28) and six taken in the 2015 observing season (2014
December 27-2015 January 06).
Follow-up photometric observations of both primary and secondary
eclipses were performed with the MEarth-south telescopes. We observed
11 unique eclipse events with six different telescopes. We have
obtained 9173 individual observations of LP 661-13, with 5098
observations being in-eclipse measurements and 4075 out-of-eclipse
measurements.
Objects:
---------------------------------------------------------------
RA (ICRS) DE Designation(s) (Period)
---------------------------------------------------------------
06 56 18.95 -08 35 46.1 LP 661-13 = NLTT 17194 (P=4.704)
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File Summary:
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FileName Lrecl Records Explanations
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ReadMe 80 . This file
table1.dat 29 13 TRES radial velocities for LP 661-13 (Barycentric)
table2.dat 34 9173 MEarth photometry for LP 661-13
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See also:
J/A+A/327/1039 : Structure and evolution of low-mass stars (Chabrier+ 1997)
J/A+A/337/403 : Low-mass stars evolutionary models (Baraffe+ 1998)
J/ApJS/141/503 : Radial Velocities for 889 late-type stars (Nidever+, 2002)
J/A+A/398/239 : RI differential photometry of CU Cnc (Ribas, 2003)
J/ApJ/582/1011 : Revised NLTT Catalog (Salim+, 2003)
J/AJ/128/463 : A preliminary 20pc census from the NLTT catalog (Reid+, 2004)
J/ApJ/684/635 : New low-mass eclipsing binary from SDSS-II (Blake+, 2008)
J/ApJ/691/1400 : Absolute properties of CM Dra (Morales+, 2009)
J/ApJ/720/1118 : i-band photometry of HAT-P-16 (Buchhave+, 2010)
J/other/A+ARV/18.67 : Accurate masses and radii of normal stars (Torres+, 2010)
J/AJ/141/166 : HATNet variability survey of K and M dwarfs (Hartman+, 2011)
J/ApJ/742/123 : Photometry and Velocity of LSPM J1112+7626 (Irwin+, 2011)
J/ApJ/728/48 : Multicolor eclipse data for 6 new binaries (Kraus+, 2011)
J/MNRAS/431/3240 : Ji photometry of WTS 19g-4-02069 (Nefs+, 2013)
J/ApJ/768/127 : Q1-11 Kepler light curve of KIC 4862625 (Schwamb+, 2013)
J/A+A/557/A119 : Eclipsing binary system LL Aquarii (Southworth, 2013)
J/ApJ/784/156 : Parallaxes for nearby mid-to-late M dwarfs (Dittmann+, 2014)
J/A+A/572/A50 : J0113+31 light + velocity curves (Gomez Maqueo Chew+, 2014)
J/ApJS/220/16 : SpeX NIR survey of 886 nearby M dwarfs (Terrien+, 2015)
J/ApJ/804/64 : Empirical and model parameters of 183 M dwarfs (Mann+, 2015)
J/ApJ/818/153 : MEarth photometry: nearby M-dwarf magnitudes (Dittmann+, 2016)
Byte-by-byte Description of file: table1.dat
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Bytes Format Units Label Explanations
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1- 13 F13.5 d HJD Heliocentric Julian Date
15-21 F7.3 km/s RV1 [-39/39] Radial velocity of primary component
23-29 F7.3 km/s RV2 [-61.1/61.8] Radial velocity of secondary component
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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- 13 F13.5 d HJD Heliocentric Julian Date
15- 21 F7.4 mag Delmag [-0.2/0.09] Differential magnitude
in MEarth bandpass (1)
23- 28 F6.4 mag e_Delmag [0.001/0.08] Uncertainty in Delmag
30- 34 A5 --- Tel Observing telescope
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Note (1): Schott RG715 glass filter with an anti-reflection coating, similar
the Cousins I band filter.
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History:
From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 22-Sep-2017