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J/ApJ/845/72 The factory & the beehive. III. PTFEB132.707+19.810 (Kraus+, 2017)

The factory and the beehive. III. PTFEB132.707+19.810, a low-mass eclipsing binary in Praesepe observed by PTF and K2. Kraus A.L., Douglas S.T., Mann A.W., Agueros M.A., Law N.M., Covey K.R., Feiden G.A., Rizzuto A.C., Howard A.W., Isaacson H., Gaidos E., Torres G., Bakos G. <Astrophys. J., 845, 72 (2017)> =2017ApJ...845...72K
ADC_Keywords: Binaries, eclipsing ; Photometry, RI ; Radial velocities Keywords: binaries: eclipsing; stars: evolution; stars: fundamental parameters; stars: individual (PTFEB132.707+19.810); stars: low-mass; starspots Abstract: Theoretical models of stars constitute the fundamental bedrock upon which much of astrophysics is built, but large swaths of model parameter space remain uncalibrated by observations. The best calibrators are eclipsing binaries in clusters, allowing measurement of masses, radii, luminosities, and temperatures for stars of known metallicity and age. We present the discovery and detailed characterization of PTFEB132.707+19.810, a P=6.0day eclipsing binary in the Praesepe cluster (τ∼600-800Myr; [Fe/H]=0.14±0.04). The system contains two late-type stars (SpTP=M3.5±0.2; SpTS=M4.3±0.7) with precise masses (Mp=0.3953±0.0020M; Ms=0.2098±0.0014M) and radii (Rp=0.363±0.008R; Rs=0.272±0.012R). Neither star meets the predictions of stellar evolutionary models. The primary has the expected radius but is cooler and less luminous, while the secondary has the expected luminosity but is cooler and substantially larger (by 20%). The system is not tidally locked or circularized. Exploiting a fortuitous 4:5 commensurability between Porb and Prot,prim, we demonstrate that fitting errors from the unknown spot configuration only change the inferred radii by ≲1%-2%. We also analyze subsets of data to test the robustness of radius measurements; the radius sum is more robust to systematic errors and preferable for model comparisons. We also test plausible changes in limb darkening and find corresponding uncertainties of ∼1%. Finally, we validate our pipeline using extant data for GU Boo, finding that our independent results match previous radii to within the mutual uncertainties (2%-3%). We therefore suggest that the substantial discrepancies are astrophysical; since they are larger than those for old field stars, they may be tied to the intermediate age of PTFEB132.707+19.810. Description: The PTF uses wide-field photometric observations from the robotic 48 inch Samuel Oschin Telescope (P48). When PTFEB132.707+19.810 was observed in 2010 and 2011, P48 was equipped with the CFH12K mosaic camera. PTFEB132.707+19.810 was observed as EPIC211972086 by the Kepler spacecraft during Campaign 5 of its repurposed K2 mission (Howell+ 2014PASP..126..398H), for which it was proposed as a target by eight proposals, including ours (GO5095; PI: Agueros). K2 observed PTFEB132.707+19.810 in long-cadence mode (tint=29.4minutes) for 73.9 continuous days spanning 2015 April 27-July 10. After our discovery of eclipses in this system in 2010, we began a spectroscopic monitoring campaign to measure radial velocities for the components. We obtained 20 high-dispersion spectra for the system using Keck I and the HIRES spectrograph (resolution of R∼48000). We also obtained an optical spectrum of PTFEB132.707+19.810 on 2016 April 3 with SNIFS on the University of Hawai'i 2.2m telescope on Maunakea (R∼1000 in blue channel). We obtained a NIR spectrum of PTFEB132.707+19.810 on 2016 April 5 with the SpeX spectrograph on the NASA Infrared Telescope Facility on Maunakea (R∼2000). Objects: ------------------------------------------------------------------------ RA (ICRS) DE Designation(s) (Per) ------------------------------------------------------------------------ 08 50 49.84 +19 48 36.5 PTFEB132.707+19.810 = EPIC 211972086 (P=6) ------------------------------------------------------------------------ File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 29 602 PTF Photometry table2.dat 28 3339 K2 Photometry table4.dat 117 24 Keck-I/HIRES radial velocities (RVs)
See also: III/116 : Spectrophotometric Standards (Massey+ 1988) VI/39 : Model Atmospheres (Kurucz, 1979) V/139 : SDSS Photometric Catalog, DR9 (Adelman-McCarthy+, 2012) J/AJ/124/1570 : JHKs photometry in Praesepe (Adams+, 2002) J/ApJ/640/1018 : Differential photometry of V1061 Cyg (Torres+, 2006) J/AJ/134/2340 : Membership of Praesepe & Coma Berenices (Kraus+, 2007) J/MNRAS/389/585 : Fundamental parameters of M dwarfs (Casagrande+, 2008) J/AJ/136/2158 : CV Boo V-band and radial velocity curves (Torres+, 2008) J/AJ/135/785 : SDSS-DR5 low-mass star spectroscopic sample (West+, 2008) J/A+A/502/253 : V636 Cen radial velocities curves (Clausen+, 2009) J/ApJ/691/1400 : Absolute properties of CM Dra (Morales+, 2009) J/A+A/510/A21 : Stellar Limb-Darkening Coefficients (Sing, 2010) J/other/A+ARV/18.67 : Accurate masses and radii of normal stars (Torres+, 2010) J/A+A/529/A75 : Limb-darkening coefficients (Claret+, 2011) J/MNRAS/413/2218 : Stellar rotation in Hyades and Praesepe (Delorme+, 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/AJ/141/97 : SDSS DR7 M dwarfs (West+, 2011) J/MNRAS/426/3419 : UKIDSS GCS Praesepe members (Boudreault+, 2012) J/ApJ/757/112 : Stellar diameters. II. K and M-stars (Boyajian+, 2012) J/A+A/546/A14 : Limb-darkening for CoRoT, Kepler, Spitzer (Claret+, 2012) J/AJ/143/4 : Kepler cycle 1 obs. of low-mass stars (Harrison+, 2012) J/ApJ/779/188 : Spectra of nearby late K and M Kepler stars (Mann+, 2013) J/ApJ/770/43 : Spectroscopic [Fe/H] of Kepler stars (Mann+, 2013) J/ApJ/775/L11 : Stellar rotation periods for KOIs (McQuillan+, 2013) J/A+A/556/A15 : Effective temp. scale of M dwarfs (Rajpurohit+, 2013) J/ApJ/788/L9 : Stellar param. of KIC planet-host stars (Bastien+, 2014) J/AJ/147/82 : Monitoring of disk-bearing stars in NGC2264 (Cody+, 2014) J/ApJ/795/161 : Activity & rotation in Praesepe & Hyades (Douglas+, 2014) J/AJ/147/146 : Spectroscopy of Tuc-Hor candidate members (Kraus+, 2014) J/ApJ/804/64 : Empirical and model param. of 183 M dwarfs (Mann+, 2015) J/AJ/152/141 : Solar neighborhood. XXXVII. (Benedict+, 2016) J/ApJ/822/47 : K2 rotation periods for Hyades members (Douglas+, 2016) J/ApJS/224/2 : K2 EPIC properties for 138600 targets (Huber+, 2016) J/ApJ/821/93 : M dwarfs rotation & Galactic kinematics (Newton+, 2016) J/ApJ/836/124 : 2yrs of eclipse data & RVs for LP661-13 (Dittmann+, 2017) J/A+A/600/A55 : Refined Analysis of T-Cyg1-12664 (Iglesias-Marzoa+, 2017) J/ApJ/842/83 : Praesepe members periods from K2 LCs (Douglas+, 2017) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1- 9 F9.4 d Epoch Epoch, HJD-2450000 11- 16 F6.4 --- Phase Phase 18- 23 F6.3 mag Rmag [16.6/17.5] PTF aperture R magnitude 25- 29 F5.3 mag e_Rmag [0.006/0.07] Uncertainty in Rmag
Byte-by-byte Description of file: table2.dat
Bytes Format Units Label Explanations
1- 9 F9.4 d Epoch Epoch, HJD-2450000 11- 16 F6.4 --- Phase Phase 18- 22 F5.3 --- Flux [0.7/1.2] K2 aperture photometry, normalized 24- 28 F5.3 --- e_Flux [0.001/0.07] Uncertainty in Flux, normalized
Byte-by-byte Description of file: table4.dat
Bytes Format Units Label Explanations
1- 19 A19 --- Name Target Name 21 A1 --- f_Name [TS] (T)arget (PTFEB132.707+19.810); (S)tandard star 23- 36 F14.5 yr Date ? UT fractional date, Keck Archive observation 38- 47 F10.5 d Epoch Epoch of observation, HJD-2450000 49- 52 I4 0.1nm lambda-min [3360/4450] Wavelength range, min 54- 57 I4 0.1nm lambda-max [8100/8910] Wavelength range, max 59- 62 I4 s Tinit [120/1200] Exposure time, seconds 64- 68 F5.2 km/s HRV1 [0.2/68.1]? Heliocentric radial velocity, primary (1) 70- 73 F4.2 km/s e_HRV1 [0.07/1.6]? Uncertainty in HRV1 75- 78 F4.2 km/s sigma1 [7.6/9]? Broadening function, primary (2) 80- 83 F4.2 km/s e_sigma1 [0.06/0.9]? Uncertainty in sigma1 85- 90 F6.2 km/s HRV2 [-32/99]? Heliocentric radial velocity, secondary (1) 92- 95 F4.2 km/s e_HRV2 [0.1/1.2]? Uncertainty in HRV2 97-100 F4.2 km/s sigma2 [6.7/9]? Broadening function, secondary (2) 102-105 F4.2 km/s e_sigma2 [0.1/0.9]? Uncertainty in sigma2 107-111 F5.3 --- F1/F2 [0.2/0.4]? Flux ratio, secondary/primary 113-117 F5.3 --- e_F1/F2 [0.01/0.05]? Uncertainty in F1/F2
Note (1): In each observation, the component velocities are subject to a shared systematic uncertainty of ±300m/s from the uncertainty in the absolute RV scale. Furthermore, the velocities at all epochs are subject to a shared systematic uncertainty of ±170m/s because they are all measured with respect to the same three calibrator stars, each of which has a systematic uncertainty of ±300m/s. Note (2): The standard deviation of the Gaussian fits to the two stars' broadening functions, which is a measure of both the instrumental broadening and the rotational broadening.
History: From electronic version of the journal References: Agueros et al. Paper I. 2011ApJ...740..110A Douglas et al. Paper II. 2014ApJ...795..161D Cat. J/ApJ/795/161 Douglas et al. 2017ApJ...842...83D Cat. J/ApJ/842/83 Kraus et al. Paper III. 2017ApJ...845...72K This Catalog
(End) Prepared by [AAS], Emmanuelle Perret [CDS] 08-Mar-2018
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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