2011AJ....142...60V

Query : 2011AJ....142...60V

2011AJ....142...60V - Astron. J., 142, 60 (2011/August-0)

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. and SURACE J.A.

Abstract (from CDS):

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°.5x2°.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 (7-10 Myr) 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. We find 82 new eclipsing binary systems, 9 of which are good candidate 25 Ori or Orion OB1a association members. Of these, two are potential young W UMa type systems. We report on the possible low-mass (M-dwarf primary) eclipsing systems in the sample, which include six of the candidate young systems. Forty-five of the binary systems are close (mainly contact) systems, and one of these shows an orbital period among the shortest known for W UMa binaries, at 0.2156509±0.0000071 days, with flat-bottomed primary eclipses, and a derived distance that appears consistent with membership in the general Orion association. One of the candidate young systems presents an unusual light curve, perhaps representing a semi-detached binary system with an inflated low-mass primary or a star with a warped disk, and may represent an additional young Orion member. Finally, we identify 14 probable new classical T-Tauri stars in our data, along with one previously known (CVSO 35) and one previously reported as a candidate weak-line T-Tauri star (SDSS J052700.12+010136.8).

Abstract Copyright: ∼

Journal keyword(s): binaries: close - binaries: eclipsing - open clusters and associations: individual: 25 Ori - planets and satellites: detection - stars: pre-main sequence - techniques: photometric

VizieR on-line data: <Available at CDS (J/AJ/142/60): table1.dat table3.dat>

Nomenclature: Tables 1, 3: [VCR2011] NN-NNNN N=82+16.

Simbad objects: 111

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Number of rows : 111
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 V* AA Tau Or* 04 34 55.4201902392 +24 28 53.033624580 13.14 13.34 12.20 12.03   K5Ve 801 0
2 2MASS J05194592+0201361 EB* 05 19 45.9260753688 +02 01 36.278800104       15.56   ~ 1 0
3 2MASS J05195397+0047438 EB* 05 19 53.9834118552 +00 47 43.864793772       17.37   ~ 2 0
4 ATO J079.9794+00.9811 EB* 05 19 55.0566067416 +00 58 52.208896332       12.80   ~ 2 0
5 ZTF J052000.49+021516.0 EB* 05 20 00.4924297200 +02 15 15.956193456       15.62   ~ 3 0
6 2MASS J05200487+0046426 EB* 05 20 04.8869301840 +00 46 42.595188024       16.48   ~ 2 0
7 CRTS J052008.8+024545 EB* 05 20 08.8150075800 +02 45 46.057246632     18.44 18.09 17.641 ~ 5 0
8 CRTS J052015.3+023010 EB* 05 20 15.3606153720 +02 30 10.609587000     16.13 15.93   ~ 4 0
9 2MASS J05204154+0221186 EB* 05 20 41.5493920320 +02 21 18.828719748       16.07   ~ 1 0
10 2MASS J05210397+0240275 EB* 05 21 03.9640682352 +02 40 27.455886876       14.58   ~ 1 0
11 ATO J080.2823+02.7777 EB* 05 21 07.7700669408 +02 46 39.703081908     17.577 17.11 16.587 ~ 5 0
12 UCAC2 32149298 Em* 05 21 10.3241867616 +01 22 20.322529968     15.2 14.55   ~ 2 0
13 CRTS J052110.3+013800 EB* 05 21 10.3972269480 +01 38 00.263686416     14.63 14.50 14.214 ~ 5 0
14 CRTS J052111.9+025619 EB* 05 21 11.9183765400 +02 56 19.051448460     16.43 16.23   ~ 3 0
15 CRTS J052132.8+011008 EB* 05 21 32.8570823280 +01 10 08.422230684     15.61 15.40 14.945 ~ 7 0
16 2MASS J05214195+0257109 EB* 05 21 41.9327307768 +02 57 10.872601632       17.12   ~ 2 0
17 CRTS J052148.6+022644 EB* 05 21 48.6012920928 +02 26 48.094895292     16.98 17.24 16.504 ~ 4 0
18 2MASS J05215079+0220205 EB* 05 21 50.7871610160 +02 20 20.512086864       13.90   ~ 2 0
19 CRTS J052152.0+012122 EB* 05 21 52.0999699200 +01 21 22.415823252     16.03 15.97 15.616 ~ 5 0
20 CRTS J052202.1+014915 EB* 05 22 02.1148527528 +01 49 14.117371032     15.97 15.73 15.092 ~ 5 0
21 ATO J080.5107+01.2424 EB* 05 22 02.5782596304 +01 14 32.721365220     17.404 17.13 16.621 ~ 4 0
22 ATO J080.5405+02.6609 EB* 05 22 09.7249723464 +02 39 39.267182628       14.24   ~ 2 0
23 2MASS J05224038+0225541 EB* 05 22 40.3831824480 +02 25 54.117680052       15.44   ~ 2 0
24 2MASS J05225353+0052179 EB* 05 22 53.5310879328 +00 52 17.939822988       17.03   ~ 2 0
25 2MASS J05230561+0044515 EB* 05 23 05.6108719032 +00 44 51.505382364       15.84   ~ 2 0
26 CVSO 590 TT* 05 23 05.9627616150 +01 38 51.135282771     17.236 16.18 14.544 M4e 24 0
27 CVSO 596 TT* 05 23 12.4068683448 +01 21 15.133274280       13.95   K6e 21 0
28 2MASS J05231240+0211079 EB* 05 23 12.4128897648 +02 11 07.906826040     16.916 16.67   ~ 3 0
29 2MASS J05234174+0111454 EB* 05 23 41.7412895616 +01 11 45.516577740       16.67   ~ 2 0
30 CRTS J052342.9+005224 EB* 05 23 42.9644008176 +00 52 24.455884944     14.18 13.98   ~ 9 0
31 CRTS J052346.9+020022 EB* 05 23 47.0123545800 +02 00 22.555275660     16.17 15.91   ~ 5 0
32 CRTS J052348.7+004808 EB* 05 23 48.7737617088 +00 48 07.820386416     15.29 15.04 14.740 ~ 7 0
33 2MASS J05235410+0108128 TT? 05 23 54.1052329272 +01 08 12.818228892     16.7 16.03   M1.9e 8 0
34 2MASS J05241461+0143004 EB* 05 24 14.6178357168 +01 43 00.523262820       13.16   ~ 2 0
35 2MASS J05241824+0217200 TT? 05 24 18.2427666840 +02 17 19.974645024       17.33   M3.5e 9 0
36 2MASS J05241975+0218507 EB* 05 24 19.7558284416 +02 18 50.586617700       16.63   ~ 1 0
37 CRTS J052442.6+013151 EB* 05 24 42.7009061688 +01 31 51.244959684     18.02 17.66   ~ 4 0
38 NAME 25 Ori Group OpC 05 24 50.9 +01 41 38           ~ 195 1
39 2MASS J05245720+0218173 EB* 05 24 57.2177700888 +02 18 17.800998876       16.93   ~ 2 0
40 Kiso A-0903 117 Y*O 05 25 04.6887013800 +01 20 50.958675528     16.9 15.95   M2.4e 16 0
41 2MASS J05254119+0249059 TT? 05 25 41.1997436592 +02 49 05.901970404       16.33   M1.5e 4 0
42 CVSO 35 TT* 05 25 45.914400 +01 45 50.11020   14.48 13.36 13.85 12.81 K7 26 0
43 CVSO 807 TT* 05 25 48.3936768408 +01 58 27.707239200     17.60 16.53 14.69 M4.25Ve 5 0
44 CRTS J052556.8+020405 EB* 05 25 56.8893933072 +02 04 05.010133692     16.68 16.47   ~ 7 0
45 2MASS J05255953+0157593 EB* 05 25 59.5369060704 +01 57 59.325318360       17.06   ~ 8 0
46 CRTS J052617.9+014924 EB* 05 26 17.8886483952 +01 49 25.755387888     17.63 17.65   ~ 6 0
47 CRTS J052623.2+015618 EB* 05 26 23.1686665536 +01 56 19.560528852     17.01 16.82   ~ 4 0
48 ATO J081.6711+00.8374 EB* 05 26 41.0799720408 +00 50 14.630476776     14.549 14.19 13.761 ~ 7 0
49 Kiso A-0903 134 Y*O 05 26 55.3747781472 +01 40 22.400483700   16.40 15.56 15.99 14.82 ~ 31 0
50 2MASS J05270012+0101368 TT? 05 27 00.1279390632 +01 01 36.892560936       16.46   M3.2e 6 0
51 ATO J081.8102+01.1162 EB* 05 27 14.4502295400 +01 06 58.435275240       14.28   ~ 3 0
52 2MASS J05272748+0058506 EB* 05 27 27.4769726376 +00 58 50.784436128       14.87   ~ 2 0
53 CRTS J052728.7+010826 EB* 05 27 28.7472015000 +01 08 26.727135720     17.25 17.00   ~ 7 0
54 CRTS J052752.3+010134 EB* 05 27 52.3185320808 +01 01 34.575357792     16.26 16.11 15.863 ~ 8 0
55 CRTS J052802.3+014801 EB* 05 28 02.3698832016 +01 48 01.601266968     16.89 16.75   ~ 6 0
56 2MASS J05282024+0121159 TT* 05 28 20.2478437152 +01 21 15.960015288       15.07   M0e 10 0
57 RX J0528.3+0338 ** 05 28 20.827776 +03 38 32.65008   12.740 11.706 11.418   K4 29 0
58 2MASS J05283707+0103024 EB* 05 28 37.0677661776 +01 03 02.551972212       15.80   ~ 1 0
59 2MASS J05284514+0120089 EB* 05 28 45.1530593208 +01 20 08.950194204     15.887 15.40 14.913 ~ 2 0
60 ATO J082.1928+00.8569 EB* 05 28 46.2869469744 +00 51 24.861090240       15.71   ~ 3 0
61 2MASS J05285732+0059431 TT? 05 28 57.3188258232 +00 59 43.107156600       18.70   ~ 1 0
62 V* V1642 Ori A SB* 05 29 20.6215098192 +00 41 27.948799752           K1/2e+K7/M0e 19 0
63 2MASS J05292516+0255538 EB* 05 29 25.1582285568 +02 55 53.907337884       17.64   ~ 2 0
64 2MASS J05293750+0221251 EB* 05 29 37.5093991392 +02 21 25.115406840       17.75   ~ 4 0
65 2MASS J05293913+0149156 TT* 05 29 39.1420371264 +01 49 15.593300832       16.86   M4.3e 10 0
66 CRTS J052951.4+004634 EB* 05 29 51.4204224552 +00 46 33.796848180     17.47 17.48   ~ 7 0
67 2MASS J05295852+0102022 EB* 05 29 58.5279650976 +01 02 02.226509988     14.324 13.99   ~ 2 0
68 2MASS J05300573+0047249 EB* 05 30 05.7367749456 +00 47 24.982857096       17.11   ~ 1 0
69 UCAC4 460-010828 ** 05 30 08.323416 +01 48 48.91032   14.877 13.696 13.311   ~ 12 0
70 CVSO 1241 TT* 05 30 12.4047224208 +01 48 21.399503940     17.5 16.47   M2e 11 0
71 ATO J082.5763+01.3134 EB* 05 30 18.3258057288 +01 18 48.425339628       15.17   ~ 5 0
72 CRTS J053019.4+024036 EB* 05 30 19.4132687808 +02 40 37.408388268     17.21 17.04 16.589 ~ 5 0
73 Kiso A-0903 195 TT* 05 30 31.6524811320 +02 03 05.154985980   16.86 15.51 15.17   K7e 21 0
74 ATO J082.6729+02.5639 EB* 05 30 41.4983666160 +02 33 50.260026960     16.721 16.31 15.724 ~ 4 0
75 CRTS J053052.3+013325 EB* 05 30 52.3486519272 +01 33 25.518864996     14.74 14.64   ~ 4 0
76 CRTS J053054.1+015550 EB* 05 30 54.3633697824 +01 55 49.655841924     13.22 13.65   ~ 6 0
77 2MASS J05305452+0056286 TT? 05 30 54.5184366144 +00 56 28.596499800       17.10   ~ 1 0
78 ATO J082.7673+02.7469 EB* 05 31 04.1669564989 +02 44 49.160450179     17.923 17.22 16.609 ~ 6 0
79 CRTS J053108.8+005800 EB* 05 31 08.8314491419 +00 58 00.847655634     15.02 14.77 14.110 ~ 8 0
80 CRTS J053116.3+012030 EB* 05 31 16.3274507640 +01 20 29.977071396     14.96 14.64   ~ 4 0
81 2MASS J05312959+0241183 Y*O 05 31 29.6077317781 +02 41 18.350169065       15.88   ~ 2 0
82 ATO J082.8786+01.5000 EB* 05 31 30.8735188752 +01 30 00.331738056       16.09   ~ 3 0
83 2MASS J05313758+0226397 SB* 05 31 37.5899582664 +02 26 39.611453640       12.67   ~ 9 0
84 CRTS J053138.4+015702 EB* 05 31 38.4356301024 +01 57 02.556017424     13.93 13.87   ~ 5 0
85 CRTS J053146.6+004926 EB* 05 31 46.6943246520 +00 49 26.130793872     16.85 16.68 16.474 ~ 7 0
86 2MASS J05315396+0242310 TT? 05 31 53.9610649080 +02 42 31.185652500       17.55   ~ 4 0
87 CVSO 1327 TT* 05 31 58.2021511440 +01 39 38.180091348       17.75   M3e 8 0
88 CRTS J053207.7+010412 EB* 05 32 07.7440713864 +01 04 11.689399128     15.62 15.33 14.751 ~ 9 0
89 2MASS J05320820+0132287 EB* 05 32 08.2022582928 +01 32 28.633528500       13.38   ~ 2 0
90 CRTS J053212.1+021546 EB* 05 32 12.1682042832 +02 15 46.210773024     18.20 17.88   ~ 5 0
91 CRTS J053214.6+010739 EB* 05 32 14.6318362368 +01 07 39.350286156     18.72 18.40 17.470 ~ 5 0
92 2MASS J05322562+0236214 EB* 05 32 25.6260561936 +02 36 21.518853300       16.50   ~ 2 0
93 2MASS J05322632+0223097 EB* 05 32 26.3206108224 +02 23 09.953473128       16.73   ~ 2 0
94 2MASS J05324332+0118566 EB* 05 32 43.3252643424 +01 18 56.423948112       15.79   ~ 1 0
95 ATO J083.2188+02.3766 EB* 05 32 52.525 +02 22 35.71       13.61   ~ 2 0
96 ATO J083.2604+02.6455 EB* 05 33 02.5049558616 +02 38 43.812887352       15.56   ~ 2 0
97 CRTS J053317.3+014049 EB* 05 33 17.2061125728 +01 40 49.791919908     14.88 14.83   ~ 12 0
98 CRTS J053321.8+015310 EB* 05 33 21.8164398960 +01 53 10.684252140     16.21 16.20   ~ 7 0
99 CRTS J053323.1+025828 EB* 05 33 23.1934555992 +02 58 28.131170880     13.59 13.46   ~ 15 0
100 CRTS J053323.3+025740 EB* 05 33 23.3475896064 +02 57 40.224071160     14.00 13.79   ~ 8 0
101 CRTS J053335.3+024131 EB* 05 33 35.3575721928 +02 41 31.360614720     16.01 15.94   ~ 5 0
102 ATO J083.4272+01.8243 EB* 05 33 42.5382160296 +01 49 27.621241824       14.95   ~ 5 0
103 V* V1174 Ori Or* 05 34 27.8529220296 -05 41 37.875014808 16.506 15.070 14.305   12.367 K4.5e 59 0
104 NAME Orion Nebula Cluster OpC 05 35.0 -05 29           ~ 2514 0
105 V* V2212 Ori Or* 05 35 11.1413470656 -05 36 51.212579400 18.461 16.619 15.379   12.444 M2 69 0
106 2MASS J05351214-0531388 TT* 05 35 12.1462604784 -05 31 38.817487344 19.716 18.292 17.169 15.68 13.554 M5 68 0
107 NAME Ori Region reg 05 35 17.30 -05 23 28.0           ~ 623 0
108 V* V2384 Ori Or* 05 35 21.8473218600 -05 46 08.571352260       19.21 17.28 M7 109 1
109 NAME Ori I As* 05 38 -02.8           ~ 653 0
110 CD-35 9931 TT* 14 58 37.6872422736 -35 40 30.394769052   11.92 10.75   9.85 K2.5IV 35 0
111 Ass Ori OB 1a As* ~ ~           ~ 237 0

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