================================================================================ A PSF-based approach to Kepler/K2 data -- III. Search for exoplanets and variable stars within the open cluster M 67 (NGC 2682) D. Nardiello, M. Libralato, L. R. Bedin, G. Piotto, L. Borsato, V. Granata, L. Malavolta, V. Nascimbeni (2016, MNRAS) ================================================================================ Keywords: techniques: image processing - techniques: photometric - binaries: general - planetary systems - stars: variables: general - Galaxy: open clusters and associations: individual: NGC 2682 (M 67) Abstract: In the third paper of this series we continue the exploitation of Kepler/K2 data in dense stellar fields using our PSF-based method. This work is focused on a ~720-arcmin^2 region centred on the Solar-metallicity and Solar-age open cluster M 67. We extracted light curves for all detectable sources in the Kepler channels 13 and 14, adopting our technique based on the usage of a high-angular-resolution input catalogue and target-neighbour subtraction. We detrended light curves for systematic errors, and searched for variables and exoplanets using several tools. We found 451 variables, of which 299 are new detection. Three planetary candidates were detected by our pipeline in this field. Raw and detrended light curves, catalogues, and K2 stacked images used in this work will be released to the community. Description: We release: (1) two astro-photometric catalogues of all sources analyzed in our work on K2/Campaign 5/channels 13 and 14 (2) the light curves of the objects in the field (3) two catalogue for all variable stars and candidate exoplanets found in M 67 field (4) two stacked images, one for each K2/Campaign 5/channel 13 and 14 File Summary: ----------------------------------------------------------------------------------------------------------- FileName recl Records Explanations ----------------------------------------------------------------------------------------------------------- ReadMe 107 . This file m67.ch13.dat 270 2954 Input catalog for Ch13 m67.ch14.dat 270 1217 Input catalog for Ch14 LC.??????_1? 201 3620 Light curves in M 67 field from K2/C5 data (4177 files) variables.ch13.dat 168 320 Variable stars in K2/C5/M67 field (Ch13) variables.ch14.dat 168 171 Variable stars in K2/C5/M67 field (Ch14) M67_1?_WCS.fits 0 0 K2 Stacked images (FITS files) ----------------------------------------------------------------------------------------------------------- Byte-by-byte Description of file: m67.ch1?.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 12- 20 F9.5 deg RA Right ascension (J2000) 32- 40 F9.6 deg DEC Declination (J2000) 53- 60 F8.5 mag Kpmag Instrumental Kepler magnitude 74- 80 F8.4 mag Bmag Calibrated B magnitude (1) 94-100 F8.4 mag Vmag Calibrated V magnitude (1) 114-124 F8.4 mag Rmag Calibrated R magnitude (1) 134-140 F8.4 mag Imag Calibrated I magnitude (1) 154-160 F7.3 mag J_2MASS Calibrated J_2MASS magnitude (1) 174-180 F7.3 mag H_2MASS Calibrated H_2MASS magnitude (1) 194-200 F7.3 mag K_2MASS Calibrated K_2MASS magnitude (1) 203-209 I7 --- ID ID number of the star 222-229 F7.4 mas/yr pmra mu_alpha cosdelta proper motion (2,3) 242-249 F7.4 mas/yr pmdec mu_delta proper motion (2,3) 262-269 F7.4 --- membership probability (3,4) -------------------------------------------------------------------------------- (1) The magnitude is set at -99.999 if missing (2) The proper motion is set at -999.99 if missing (3) From Nardiello et al. (2016, MNRAS, 455, 2337) (4) The membership probability is set at -999.99 if missing Byte-by-byte Description of file: variables.ch1?.dat -------------------------------------------------------------------------------- Bytes Format Units Label Explanations -------------------------------------------------------------------------------- 3- 11 F9.5 deg RA Right ascension (J2000) 15- 23 F9.6 deg DEC Declination (J2000) 27- 37 F11.8 day Period Period(1) 41- 48 F8.5 mag Kpmag Instrumental Kepler magnitude 52- 58 F8.4 mag Bmag Calibrated B magnitude (2) 62- 68 F8.4 mag Vmag Calibrated V magnitude (2) 72- 78 F8.4 mag Rmag Calibrated R magnitude (2) 82- 88 F8.4 mag Imag Calibrated I magnitude (2) 91- 97 F7.3 mag J_2MASS Calibrated J_2MASS magnitude (2) 101-107 F7.3 mag H_2MASS Calibrated H_2MASS magnitude (2) 111-117 F7.3 mag K_2MASS Calibrated K_2MASS magnitude (2) 122-125 I4 --- ID ID number of the star 129-136 F7.4 mas/yr pmra mu_alpha cosdelta proper motion (3,4) 141-147 F7.4 mas/yr pmdec mu_delta proper motion (3,4) 152-159 F7.4 --- membership probability (4,5) 163-163 I1 --- Clas_K2 Light-curve classification flag (6) -------------------------------------------------------------------------------- (1) If Period = 74.82 d, the star could be either irregular/long-period variable or the observed variability is due to a systematic effect (2) The magnitude is set at -99.999 if missing (3) The proper motion is set at -999.99 if missing (4) From Nardiello et al. (2016, MNRAS, 455, 2337) (5) The membership probability is set at -999.99 if missing (6) 1 = candidate variable 2 = "difficult-interpretation" object 3 = possible blend Byte-by-byte Description of file: LC.?????? -------------------------------------------------------------------------------------------------------------------- -- Bytes Format Units Label Explanations -------------------------------------------------------------------------------------------------------------------- -- 5- 21 F18.9 day TIME Average BJD for a given K2 long-cadence reconstructed exposure 25- 36 F12.8 mag M1_det Detrended K2 magnitude obtained with 1-pixel aperture photometry 40- 51 F12.8 mag M1_raw Raw K2 magnitude obtained with 1-pixel aperture photometry 55- 66 F12.8 mag M2_det Detrended K2 magnitude obtained with 2.5-pixel aperture photometry 70- 81 F12.8 mag M2_raw Raw K2 magnitude obtained with 2.5-pixel aperture photometry 85- 96 F12.8 mag M3_det Detrended K2 magnitude obtained with 3.5-pixel aperture photometry 100-111 F12.8 mag M3_raw Raw K2 magnitude obtained with 3.5-pixel aperture photometry 115-126 F12.8 mag M4_det Detrended K2 magnitude obtained with 4.5-pixel aperture photometry 130-141 F12.8 mag M4_raw Raw K2 magnitude obtained with 4.5-pixel aperture photometry 145-156 F12.8 mag MPSF_det Detrended K2 magnitude obtained with PSF-fitting photometry 160-171 F12.8 mag MPSF_raw Raw K2 magnitude obtained with PSF-fitting photometry 176-186 F12.8 mag MASK1_det Detrended K2 magnitude obtained with Mask-1 photometry 191-201 F12.8 mag MASK1_raw Raw K2 magnitude obtained with Mask-1 photometry 206-216 F12.8 mag MASK2_det Detrended K2 magnitude obtained with Mask-2 photometry 221-231 F12.8 mag MASK2_raw Raw K2 magnitude obtained with Mask-2 photometry 239-246 F12.4 pxl X x position in the corresponding K2 long-cadence reconstructed exposure (in K2 pixel) 254-261 F12.4 pxl Y y position in the corresponding K2 long-cadence reconstructed exposure (in K2 pixel) --------------------------------------------------------------------------------------------------------------------