J/AJ/142/60 Palomar Transient Factory Orion Project (Van Eyken+, 2011)
The Palomar Transient Factory Orion Project: eclipsing binaries and young stellar objects. Van Eyken J.C., Ciardi D.R., Rebull L.M., Stauffer J.R., Akeson R.L., Beichman C.A., Boden A.F., Von Braun K., Gelino D.M., Hoard D.W., Howell S.B., Kane S.R., Plavchan P., Ramirez S.V., Bloom J.S., Cenko S.B., Kasliwal M.M., Kulkarni S.R., Law N.M., Nugent P.E., Ofek E.O., Poznanski D., Quimby R.M., Grillmair C.J., Laher R., Levitan D., Mattingly S., Surace J.A. <Astron. J., 142, 60 (2011)> =2011AJ....142...60V
ADC_Keywords: Clusters, open ; Binaries, eclipsing ; YSOs ; Photometry, infrared Keywords: binaries: close - binaries: eclipsing - open clusters and associations: individual (25 Ori) - planets and satellites: detection - stars: pre-main sequence - techniques: photometric Abstract: The Palomar Transient Factory (PTF) Orion project is one of the experiments within the broader PTF survey, a systematic automated exploration of the sky for optical transients. Taking advantage of the wide (3.5°x2.3°) field of view available using the PTF camera installed at the Palomar 48 inch telescope, 40 nights were dedicated in 2009 December to 2010 January to perform continuous high-cadence differential photometry on a single field containing the young (7-10Myr) 25 Ori association. Little is known empirically about the formation of planets at these young ages, and the primary motivation for the project is to search for planets around young stars in this region. The unique data set also provides for much ancillary science. In this first paper, we describe the survey and the data reduction pipeline, and present some initial results from an inspection of the most clearly varying stars relating to two of the ancillary science objectives: detection of eclipsing binaries and young stellar objects. Description: Data were taken for the Orion project on the majority of the clear nights between 2009 December 1 and 2010 January 15. Weather permitting, the chosen primary field was observed in the R filter as near to continuously as possible, whenever it was higher in the sky than an airmass of 2.0. Exposures were 30s long, with a cadence varying generally between 70 and 90s, including readout time and depending on the performance of the telescope control system and guiding control loop. File Summary:
FileName Lrecl Records Explanations
ReadMe 80 . This file table1.dat 142 82 New eclipsing binaries from the PTF Orion data table3.dat 188 16 Candidate CTTSs: sources with irregular light curves and ΔR∼1.0mag or more
See also: J/AJ/129/907 : New Ori OB1 members (Briceno+, 2005) J/ApJ/661/1119 : Spectroscopy in the 25 Ori group (Briceno+, 2007) Byte-by-byte Description of file: table1.dat
Bytes Format Units Label Explanations
1 I1 --- Type [1/5] Classification of star (1) 3- 10 A8 --- Name Star designation <[VCR2011] NN-NNNN> in Simbad 11- 13 A3 --- n_Name Individual notes (2) 15- 22 F8.5 deg RAdeg Right ascension in decimal degrees (J2000) 24- 30 F7.5 deg DEdeg Declination in decimal degrees (J2000) 32- 48 A17 --- OName 2MASS/USNOB1.0 designation (G1) 50- 54 F5.2 mag Jmag ?=- 2MASS J magnitude 56- 59 F4.2 mag e_Jmag ? rms uncertainty on Jmag 61 A1 --- l_Hmag Limit flag on Hmag 62- 66 F5.2 mag Hmag ?=- 2MASS H magnitude 68- 71 F4.2 mag e_Hmag ? rms uncertainty on Hmag 73 A1 --- l_Ksmag Limit flag on Ksmag 74- 78 F5.2 mag Ksmag ?=- 2MASS Ks magnitude 80- 83 F4.2 mag e_Ksmag ? rms uncertainty on Ksmag 85 A1 --- Cl [DC] Classification, Close or Detached 87- 94 F8.6 d Per ?=- Period 96-103 F8.6 d e_Per ? rms uncertainty on Per 105-113 F9.5 d T0 Heliocentric Julian date for the epoch of the primary eclipse T0 (HJD-2455000) 115-121 F7.5 d e_T0 rms uncertainty on T0 123-126 I4 pc Dist ?=- Estimated distance to the system (3) 128-131 I4 pc e_Dist ? rms uncertainty on Dist 133-137 F5.2 mag Rmag Median-measured R magnitude 139-142 F4.2 mag dR Approximate peak-to-peak magnitude range ΔR of the measured light curve
Note (1): Classification as follows: 1 = Pre-main-sequence low-mass binary candidates 2 = Other low-mass candidates 3 = Pre-main-sequence close-binary candidates 4 = Other binaries of interest 5 = Other binaries Note (2): Note on Name as follows: a = Only one eclipse obtained - period indeterminate. b = Partial coverage of only one (presumed) eclipse obtained - period indeterminate, T0 not well constrained. c = T0 not well determined due to incomplete coverage of eclipse. Measurement error may be unreliable. d = Only one (very good) eclipse observed; period based on out-of-eclipse variation. e = Unusual light curve, possible semi-detached system. Listed distance is assuming a contact binary, but using a detached-system distance estimate yields a distance of 268±64pc - see Section 5.4.3. f = Very short period W UMa system - see Section 5.4.4. g = Used center of secondary eclipse for T0, owing to poor coverage of primary. h = Three clear eclipses, but unable to find coherent period - possible triple system? i = Nearby second source in USNO-B; chance of slight contamination. j = Secondary eclipse not evident, or primary and secondary eclipses indistinguishable - possible factor of two ambiguity in P. k = Only two eclipses obtained - period ambiguous. l = Apparent pulsating binary - short-period oscillations seen, with ∼1/2hr period. See Section 5.4.4. m = Somewhat distorted light curve shape - may actually represent stellar pulsations rather than a binary system (D. Bradstreet 2010, private communication). n = See Section 4.2 for a discussion of zero-point accuracy. o = Identified as a candidate variable star by Kraus et al. (2007, Cat. J/AJ/134/1488). Note (3): Distance estimates are omitted in cases where 2MASS magnitudes reported are limits only.
Byte-by-byte Description of file: table3.dat
Bytes Format Units Label Explanations
1- 8 A8 --- Name Star designation [VCR2011] NN-NNNN in Simbad 9 A1 --- n_Name [a-c] Individual notes (1) 11- 18 F8.5 deg RAdeg Right ascension in decimal degrees (J2000) 20- 26 F7.5 deg DEdeg Declination in decimal degrees (J2000) 28- 44 A17 --- OName 2MASS/USNOB1.0 designation (G1) 45- 49 F5.1 mas/yr pmRA Proper motion along right ascension 51- 54 F4.1 mas/yr e_pmRA rms uncertainty on pmRA 56- 60 F5.1 mas/yr pmDE Proper motion along declination 62- 65 F4.1 mas/yr e_pmDE rms uncertainty on pmDE 67- 71 F5.2 mag Rmag Median-measured R magnitude 73- 76 F4.2 mag dR Approximate peak-to-peak magnitude range ΔR of the measured light curve 78- 81 F4.2 mag e_Rmag rms uncertainty on Rmag 83- 87 F5.2 mag Jmag 2MASS J magnitude (2) 89- 92 F4.2 mag e_Jmag rms uncertainty on Jmag 94- 98 F5.2 mag Hmag 2MASS H magnitude (2) 100-103 F4.2 mag e_Hmag ? rms uncertainty on Hmag 105-109 F5.2 mag Ksmag 2MASS Ks magnitude (2) 111-114 F4.2 mag e_Ksmag ? rms uncertainty on Ksmag 116-120 F5.2 mag [3.6] ? Spitzer-IRAC 3.6um magnitude 122-125 F4.2 mag e_[3.6] ? rms uncertainty on [3.6] 127-131 F5.2 mag [4.5] ? Spitzer-IRAC 4.5um magnitude 133-136 F4.2 mag e_[4.5] ? rms uncertainty on [4.5] 138-142 F5.2 mag [5.8] ? Spitzer-IRAC 5.8um magnitude 144-147 F4.2 mag e_[5.8] ? rms uncertainty on [5.8] 149-153 F5.2 mag [8.0] ? Spitzer-IRAC 8.0um magnitude 155-158 F4.2 mag e_[8.0] ? rms uncertainty on [8.0] 160-163 F4.2 mag  ? Spitzer-IRAC 24um magnitude 165-168 F4.2 mag e_ ? rms uncertainty on  170-173 F4.2 mag Ks- ? Ks-[3.6] colour index 175-178 F4.2 mag e_Ks- ? rms uncertainty on Ks- 180-183 F4.2 mag [3.6]- ? [3.6]- colour index 185-188 F4.2 mag e_[3.6]- ? rms uncertainty on [3.6]-
Note (1): Notes as follows: a = Known CTTS CVSO 35 (Briceno et al. 2005, Cat. J/AJ/129/907; 2007, Cat. J/ApJ/661/1119) b = Reported as a candidate WTTS by McGehee (2006, Cat. J/AJ/131/2959) (SDSS J052700.12+010136.8) c = Resembles the "dipper" objects discussed by Morales-Calderon et al. (2011ApJ...733...50M) d = See Section 4.2 for a discussion of zero-point accuracy. Note (2): 2MASS quality flag is "A" in all three bands for all sources (see Section 2.3).
Global notes: Note (G1): Where possible the matched 2MASS identifier is given based on the J2000 source coordinates; in cases where no 2MASS match was found, the corresponding USNO-B1.0 match running-number-based ID is given instead, with the format "NNNN-NNNNNNNN" (with no preceding "J"). Full PTF survey catalog IDs can be constructed based on these coordinates, using the format "PTF1 JHHMMSS.ss+DDMMSS.s." Since precision astrometry was not the primary goal of the PTF Orion project, it is preferable to use 2MASS/USNO-B1.0 coordinates for this purpose rather than our PTF Orion measured coordinates.
History: From electronic version of the journal
(End) Patricia Vannier [CDS] 12-Oct-2012
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