2012ApJS..202....7X


Query : 2012ApJS..202....7X

2012ApJS..202....7X - Astrophys. J., Suppl. Ser., 202, 7 (2012/September-0)

A census of rotation and variability in L1495: a uniform analysis of Trans-atlantic Exoplanet Survey light curves for pre-main-sequence stars in Taurus.

XIAO H.Y., COVEY K.R., REBULL L., CHARBONNEAU D., MANDUSHEV G., O'DONOVAN F., SLESNICK C. and LLOYD J.P.

Abstract (from CDS):

We analyze light curves obtained by the Trans-atlantic Exoplanet Survey (TrES) for a field centered on the L1495 dark cloud in Taurus. The Spitzer Taurus Legacy Survey catalog identifies 179 bona fide Taurus members within the TrES field; 48 of the known Taurus members are detected by TrES, as well as 26 candidate members identified by the Spitzer Legacy team. We quantify the variability of each star in our sample using the ratio of the standard deviation of the original light curve (σorig.) to the standard deviation of a light curve that has been smoothed by 9 or 1001 epochs (σ9and σ1001, respectively). Known Taurus members typically demonstrate (σorig.9) < 2.0, and (σorig.1001) < 5, while field stars reveal (σorig.9) ∼ 3.0 and (σorig.1001) ∼ 10, as expected for light curves dominated by unstructured white noise. Of the 74 Taurus members/candidates with TrES light curves, we detect significant variability in 49 sources. Adapting a quantitative metric originally developed to assess the reliability of transit detections, we measure the amount of red and white noise in each light curve and identify 18 known or candidate Taurus members with highly significant period measurements. These appear to be the first periods measured for four of these sources (HD 282276, CX Tau, FP Tau, TrES J042423+265008), and in two other cases, the first non-aliased periods (LkCa 21 and DK Tau AB). For the remainder, the TrES measurements typically agree very well (δP < 1%) with previously reported values. Including periods measured at lower confidence for 15 additional sources, we report periods for 11 objects where no previous periods were found, including 8 confirmed Taurus members. We also identify 10 of the 26 candidate Taurus members that demonstrate variability levels consistent with being bona fide T Tauri stars. A Kolomgorov-Smirnov (K-S) test confirms that these new periods confirm the distinction between the rotation period distributions of stars with and without circumstellar disks, with only a 10% probability of the two populations sharing the same parent period distribution. K-S tests do suggest, however, that the updated Taurus period distribution now more closely resembles those measured in other young star-forming clusters (i.e., NGC 2264, NGC 6530, and the ONC). This improved agreement may reflect the exclusion of long rotation periods which are detected in Taurus at lower significance, and which may be beyond the limits of detectability in more distant star-forming regions.

Abstract Copyright:

Journal keyword(s): stars: pre-main sequence - stars: rotation

Nomenclature: Table 1: [XCR2012] TrES JHHMMSS+DDMMSS N=18.

Simbad objects: 89

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Number of rows : 89
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2022
#notes
1 2MASS J04115972+2942368 Y*O 04 11 59.7393492960 +29 42 36.784023840           G8 4 0
2 V* V1095 Tau TT* 04 13 14.1551534304 +28 19 10.668859500   15.32 13.81 13.62   M4 103 0
3 V* V1096 Tau TT* 04 13 27.2218223808 +28 16 24.656012868   15.42 13.53 13.07   M0 77 0
4 NAME [BM89] L1495 PoC 04 14 08.2 +28 09 31           ~ 170 0
5 HD 283447 Or* 04 14 12.9261150912 +28 12 12.359055168 13.17 12.07 10.68 9.45 8.67 K3Ve 396 0
6 V* FM Tau Or* 04 14 13.5841955640 +28 12 49.168982592 14.44   13.80 13.64   M0/2e 204 0
7 V* FN Tau Or* 04 14 14.5945463760 +28 27 58.067731188     14.70 13.68   M5 151 0
8 V* CW Tau Or* 04 14 17.0042670144 +28 10 57.766508508 13.92 13.64 12.36 12.86   K0Ve 336 0
9 2MASS J04142730+2551302 Y*? 04 14 27.3109938336 +25 51 30.209894604           G5 3 0
10 V* FP Tau Or* 04 14 47.3033083488 +26 46 26.414391720 17.21 16.14 15.02     M4Ve 156 0
11 V* CX Tau Or* 04 14 47.8615248984 +26 48 11.014877916 16.48 15.93 14.50     M1.5Ve 169 0
12 V* V1098 Tau Or* 04 14 47.9897419517 +27 52 34.232647358   14.08 11.73 10.95   M1 110 0
13 V* FO Tau Or* 04 14 49.2843205392 +28 12 30.505096476       14.92   M3.5e+M3.5e 118 0
14 [BCG93] 2 TT* 04 15 05.1562986720 +28 08 46.055825016           M5.5 43 0
15 IRAS 04125+2902 TT* 04 15 42.7871248704 +29 09 59.832447840 19.191 17.442 15.487 13.954 12.418 M0 41 0
16 HD 281820 V* 04 16 24.5624152704 +29 08 58.839155880   11.62 10.89     A2 7 0
17 EM* LkCa 4 Or* 04 16 28.1067298272 +28 07 35.731363080   13.96 12.78 11.825   K7:Ve 167 0
18 [XCR2012] TrES J041706+264414 * 04 17 06.2912869776 +26 44 13.772532948           K3 3 0
19 V* CY Tau Or* 04 17 33.7284990744 +28 20 46.812121656 14.52 14.68 13.40 12.59   M1.5 251 0
20 V* V1312 Tau TT* 04 17 38.9450182296 +28 33 00.578450700   15.57 13.26 13.12   M2 95 0
21 TYC 1819-1367-1 V* 04 18 03.3831471312 +24 40 09.656856948   12.14 11.33     A9 6 0
22 LDN 1495 DNe 04 18.1 +27 37           ~ 332 1
23 V* V409 Tau Or* 04 18 10.7829040872 +25 19 57.380624580   15.00 13.34 12.88   K8 52 0
24 V* V410 Tau Or* 04 18 31.1081296680 +28 27 16.155955728   12.13 10.75 8.45 9.408 K3Ve 444 0
25 V* DD Tau Or* 04 18 31.1289436392 +28 16 29.148496644 15.94 15.49 14.10 13.76   M3.5e+M3.5e 186 0
26 V* CZ Tau Or* 04 18 31.5898864272 +28 16 58.150241544 15.96 16.60 15.70 14.77   M2 136 0
27 V* V892 Tau Ae* 04 18 40.6157618376 +28 19 15.625058880   16.6 14.69 14.35   A0Ve 280 0
28 V* V1023 Tau Or* 04 18 47.0291197872 +28 20 07.493080560   14.31 12.00 11.21   K7 153 0
29 V* FQ Tau Or* 04 19 12.812616 +28 29 32.98128       15.00   M3 105 0
30 V* BP Tau Or* 04 19 15.8339827632 +29 06 26.926959492   13.13 12.12 11.89   K5/7Ve 634 0
31 WK81 1 TT* 04 19 26.2675117776 +28 26 14.259575472   14.81 13.04 12.240   K7 206 1
32 [XCR2012] TrES J041937+265259 * 04 19 36.600 +26 52 59.00           G3 1 0
33 V* V1070 Tau Or* 04 19 41.2688488305 +27 49 48.151086734   13.75 12.25 11.14   M0 140 0
34 2MASS J04202588+2816416 Y*? 04 20 25.8891654312 +28 16 41.713433364           G2 4 0
35 IRAS 04171+2756 TT* 04 20 26.0663816760 +28 04 09.048781704           M2 34 0
36 USNO-B1.0 1172-00072216 TT* 04 20 39.1896395400 +27 17 31.778958336           M4.5V 28 0
37 V* V412 Tau LP* 04 21 10.9918662144 +25 52 59.907644868           M6 8 0
38 2MASS J04213561+2538356 Y*? 04 21 35.6094729624 +25 38 35.624134536           F6 3 0
39 ATO J065.4429+24.4181 V* 04 21 46.2955639872 +24 25 05.162568708   16.481 14.493 14.098   M3 4 0
40 V* DE Tau Or* 04 21 55.6347850824 +27 55 06.184016436 15.18 15.13 13.80     M3Ve 240 0
41 V* RY Tau Or* 04 21 57.4092550080 +28 26 35.555316612 10.82 10.34 9.30 9.67 8.87 K1IV/Ve 673 1
42 HD 283572 Or* 04 21 58.8484815456 +28 18 06.512641416   9.80 9.03 9.14   G5IVe 276 0
43 V* FS Tau Or* 04 22 02.1798627024 +26 57 30.575293308 17.57   14.10 15.63   M3.5e+M0e 268 0
44 EM* LkCa 21 Or* 04 22 03.1470550272 +28 25 39.096067656   10.94       M3/4Ve 82 0
45 V* FT Tau Or* 04 23 39.1888788312 +24 56 14.250818940   16.15 14.93 14.70   M2.8 127 0
46 HD 283663 V* 04 23 56.0680964136 +24 27 05.123496528   11.53 10.92     F2 6 0
47 [XCR2012] TrES J042359+244742 V* 04 23 58.5930935952 +24 47 42.380657448           K2 3 0
48 [XCR2012] TrES J042423+265008 Y*O 04 24 23.2122646560 +26 50 08.356933428       14.48   M3 15 0
49 V* V1201 Tau TT* 04 24 48.1541789688 +26 43 16.062986712   13.53 11.26 10.88   K1 40 0
50 V* IP Tau Or* 04 24 57.0824018640 +27 11 56.539953888   14.50   12.46   M0:Ve 208 0
51 [HJS91] 4872 TT* 04 25 17.6698859307 +26 17 50.429311147   15.66 13.77 13.67   K9e 45 0
52 [WWV2004] J0425188+255534 LP* 04 25 18.6618700320 +25 55 36.081938028           M5 5 0
53 HD 283637 * 04 25 58.8657583584 +27 37 01.385090904   11.97 11.3     A0 15 0
54 V* FV Tau Or* 04 26 53.5368775848 +26 06 54.276020136 19.58     15.26   K5 131 2
55 V* DF Tau TT* 04 27 02.7932020080 +25 42 22.453341516 11.97 12.25 11.42 10.31 9.14 M3Ve 477 1
56 V* DG Tau Or* 04 27 04.6921275888 +26 06 16.060169268 13.57 13.97 10.50 12.28   K6Ve 983 1
57 HD 283629 V* 04 29 16.2297343848 +28 56 27.141510984   12.31 11.47     G5 7 0
58 [HJS91] 507 TT* 04 29 20.7035640048 +26 33 40.446122616 17.35   14.58     M4 42 0
59 IRAS 04262+2735 LP* 04 29 20.8325130528 +27 42 07.273581696       14.91   M5III 10 0
60 V* FW Tau Or* 04 29 29.7076208400 +26 16 52.768899480       15.85   M5.5 127 0
61 V* DH Tau Or* 04 29 41.5525353432 +26 32 58.126559604 15.14 14.62 13.10 13.01   M1Ve 283 0
62 V* DI Tau Or* 04 29 42.4723379736 +26 32 49.128692676 16.39 15.20 13.60     M0Ve 204 0
63 V* IQ Tau Or* 04 29 51.5569574040 +26 06 44.859710736 15.43   13.80 12.28 11.11 M0.5 218 0
64 NAME Tau-Aur Complex SFR 04 30 +25.0           ~ 1297 0
65 [XCR2012] TrES J043005+283307 * 04 30 04.7191924824 +28 33 06.714692316           K2 3 0
66 [WWV2004] J0430243+281911 LP* 04 30 24.1453286928 +28 19 16.435981524           M5 5 0
67 V* FX Tau Or* 04 30 29.618064 +24 26 45.02724   15.18 13.61 13.21   M4 149 0
68 CRTS J043042.8+274329 Mi* 04 30 42.8459284536 +27 43 29.967019392           M6 7 0
69 V* DK Tau A * 04 30 44.2408811328 +26 01 24.734232948           K5Ve 254 0
70 V* DK Tau Or* 04 30 44.243376 +26 01 24.65328 13.32 14.59 13.05 12.08   K7e+K7e 310 0
71 2MASS J04304474+2633084 Y*O 04 30 44.70 +26 33 08.0           K3 4 0
72 V* ZZ Tau Or* 04 30 51.3867375744 +24 42 22.335046020     12.90 13.97   M2.5V+M3.5V 135 0
73 V* V1320 Tau TT* 04 31 14.4389827248 +27 10 17.920846416   14.33 12.689 11.75 10.844 M1 50 0
74 [XCR2012] TrES J043133+292856 * 04 31 33.1380156264 +29 28 56.528439996   13.29 12.21 12.23   B9 3 0
75 [XCR2012] TrES J043145+285909 V* 04 31 45.0465176616 +28 59 08.128619232       13.32   F0 6 0
76 V* HK Tau TT* 04 31 50.5715875272 +24 24 17.775307548 16.81 16.689 15.292     M0.5 321 1
77 TYC 1833-754-1 V* 04 32 13.6495859712 +25 17 45.943842300   12.56 11.75     A9 4 0
78 V* UZ Tau Y*O 04 32 42.81 +25 52 31.3           M4Ve+M1/3Ve 298 0
79 V* UZ Tau B TT* 04 32 42.8118779016 +25 52 31.198173600   14.07 12.72 13.35   M1/3Ve 142 0
80 HD 282276 Y*O 04 33 04.2302284416 +29 21 49.832827884   11.04 10.37 9.96   B8 12 0
81 V* V830 Tau TT* 04 33 10.0300557048 +24 33 43.255480860   13.91 12.08 11.30   M0-1 196 1
82 HD 282277 V* 04 33 12.6567176088 +29 12 50.563330272   12.07 11.05     A2 6 0
83 V* GI Tau Or* 04 33 34.0609697160 +24 21 17.068989852 14.34   13.70 12.15 11.06 K5Ve 268 1
84 V* GK Tau Or* 04 33 34.5630097872 +24 21 05.855136732 15.50   13.00 12.02 10.62 K7:Ve 288 0
85 V* DL Tau Or* 04 33 39.0767679288 +25 20 38.101382952 14.04 14.59 13.40 11.85 10.89 K7Ve 309 0
86 NAME Taurus Complex SFR 04 41.0 +25 52           ~ 3954 0
87 NAME Orion Nebula Cluster OpC 05 35.0 -05 29           ~ 2149 1
88 NGC 2264 OpC 06 40 52 +09 52.6           ~ 1685 0
89 NGC 6530 OpC 18 04 31 -24 21.5           ~ 381 0

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2022.07.05-15:33:29

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