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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 (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) --------------------------------------------------------------- File Summary:
FileName Lrecl Records Explanations
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
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
Bytes Format Units Label Explanations
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
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
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
Note (1): Schott RG715 glass filter with an anti-reflection coating, similar the Cousins I band filter.
History: From electronic version of the journal
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 22-Sep-2017
The document above follows the rules of the Standard Description for Astronomical Catalogues.From this documentation it is possible to generate f77 program to load files into arrays or line by line

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