2005A&A...438.1123P


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.13CEST01:31:39

2005A&A...438.1123P - Astronomy and Astrophysics, volume 438, 1123-1140 (2005/8-2)

Doppler follow-up of OGLE planetary transit candidates in Carina.

PONT F., BOUCHY F., MELO C., SANTOS N.C., MAYOR M., QUELOZ D. and UDRY S.

Abstract (from CDS):

We present the results of our high-resolution spectroscopic follow-up of 42 planetary transit candidates in Carina from the OGLE survey. This follow-up has already allowed the discovery of three new transiting exoplanets, OGLE-TR-111, 113 and 132. Here we analyse the data for the remaining 39 candidates. The radial velocity data show that most of them are eclipsing binaries, in very varied configurations. Precise radial velocity orbits were derived for 15 binaries, revealing 9 transits of small stars (generally M-dwarfs) in front of F-G dwarfs, 1 grazing equal-mass eclipsing binary, 4 triple and 1 quadruple systems. A further 14 systems appear binary, but the exact orbit is uncertain or was not determined. 2 objects do not show any radial velocity variations in phase with the transit signal, and 6 do not possess spectral lines strong enough for a reliable cross-correlation function to be measured. Among these last two categories, up to 6 objects are suspected false positives of the photometric transit detection. 2 objects are unsolved cases that deserve further observations. Our study illustrates the wide variety of cases that can mimic photometric planetary transits, and the importance of spectroscopic follow-up. Multi-fiber capacities and an optimized follow-up strategy, which we present here, can help deal with the high number of candidates that are likely to be found in the near future. An important by-product of this study is the determination of exact masses and radii for five very low-mass stars, including two at the very edge of the stellar domain, OGLE-TR-106 (M=0.116±0.021M) and OGLE-TR-122 (M=0.092±0.009M). The radius of these objects is consistent with theoretical expectations. Two further objects, OGLE-TR-123 and OGLE-TR-129, may harbour transiting companions near the brown-dwarf/stellar limit (M≃0.07M), whose confirmation requires further high-resolution spectroscopic monitoring. No transiting massive planets (M=2-10MJ) were detected, confirming the rarity of such systems at short period as indicated by Doppler surveys. No light (M<0.5MJ), large (R>RJ) planets were found either, indicating that ``hot Saturns'' generally have smaller radii than hot Jupiters. Three short period binaries with a M-dwarf companion show definite orbital eccentricities, with periods ranging from 5.3 to 9.2 days. This confirms theoretical indications that orbital circularisation in close binaries is less efficient for smaller companion masses. We also discuss the implications of our results for the statistical interpretation of the OGLE planetary transit survey in Carina in terms of planet frequency and detection efficiency. We find that the actual transit detection threshold is considerably higher than expected from simple estimates, and very strongly favours the detection of planets with periods shorter than about 2 days. The apparent contradition between the results of the OGLE transit survey and Doppler surveys can be resolved when this detection bias is taken into account.

Abstract Copyright:

Journal keyword(s): stars: planetary systems - stars: low-mass, brown dwarfs - stars: binaries: eclipsing

Simbad objects: 63

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Number of rows : 63

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 V* CU Cnc Er* 08 31 37.5740891049 +19 23 39.398696822   12.83 11.809 11.592   M5Ve 196 0
2 V* V739 Car EP* 10 50 04.7342176284 -61 51 32.804391646         15.69 ~ 8 0
3 V* V740 Car Al* 10 50 20.47 -61 28 34.9     17.690   16.66 ~ 6 0
4 NAME OGLE-TR-132b Pl 10 50 34.5945727713 -61 57 26.140283621           ~ 99 1
5 OGLE-TR 132 V* 10 50 34.5945727713 -61 57 26.140283621         15.72 F 94 1
6 V* V743 Car Al* 10 50 36.18 -61 40 36.5         15.86 ~ 4 0
7 V* V745 Car Al* 10 50 51.0061141274 -61 34 55.525202669     17.043   16.19 ~ 4 0
8 V* V746 Car Al* 10 51 09.2122498467 -61 43 11.616228563     17.276   16.23 ~ 10 0
9 V* V747 Car Al* 10 51 23.4182689128 -61 47 22.290402646     16.805   15.94 ~ 6 0
10 2MASS J10513197-6148087 * 10 51 31.97 -61 48 08.7         17.07 ~ 7 0
11 V* V750 Car Al* 10 52 20.6645609261 -61 29 45.439209389         15.76 ~ 9 0
12 V* V751 Car Al* 10 52 23.965 -61 31 09.49     16.93   15.99 ~ 10 0
13 OGLE-TR 113 SB* 10 52 24.2808297652 -61 26 48.845891762     16.08 15.41 14.42 K 112 1
14 NAME OGLE-TR-113b Pl 10 52 24.2808297652 -61 26 48.845891762           ~ 110 1
15 V* V753 Car Al* 10 52 28.2560950409 -61 29 32.158437332     17.29   16.15 ~ 8 0
16 V* V754 Car Al* 10 52 46.3516146938 -61 23 17.966672316     14.466   13.64 ~ 7 0
17 NAME OGLE-TR-111b Pl 10 53 17.8066842748 -61 24 20.606379347           ~ 107 1
18 OGLE-TR 111 V* 10 53 17.8066842748 -61 24 20.606379347     16.96 16.05 15.55 G 90 1
19 V* V763 Car EP* 10 53 40.6211139327 -61 25 15.109446443     15.80   14.99 F0V 13 1
20 V* V764 Car Al* 10 53 51.1161914559 -61 34 13.651180974     17.71   16.53 ~ 19 0
21 V* V765 Car Al* 10 54 23.4790202745 -61 37 21.607182878     17.594   16.66 ~ 6 0
22 V* V767 Car Al* 10 55 10.25 -61 31 04.9         14.97 ~ 6 0
23 V* V768 Car Al* 10 55 12.67 -61 54 55.3     17.641   16.47 ~ 6 0
24 V* V769 Car Al* 10 55 17.84 -61 54 35.9     16.504   15.51 ~ 6 0
25 V* V770 Car Al* 10 55 19.2626464473 -61 32 12.336416649     17.618   16.36 ~ 6 0
26 V* V771 Car Al* 10 55 20.21 -61 24 59.6     16.723   15.20 ~ 5 0
27 V* V773 Car Al* 10 55 48.7480802972 -61 28 44.786130858     15.078   14.32 ~ 5 0
28 V* V774 Car Al* 10 56 11.27 -61 29 55.4         15.78 ~ 7 0
29 V* V775 Car Al* 10 56 33.88 -61 37 11.0     15.805   14.90 ~ 5 0
30 V* V778 Car Al* 10 56 51.6641488683 -61 56 15.433722480     17.549   16.64 ~ 7 0
31 V* V783 Car Al* 10 57 51.86 -61 43 58.9     16.431   15.82 ~ 12 0
32 V* V786 Car Al* 10 58 02.98 -61 34 26.4     20.61   16.30 F8 10 0
33 V* V788 Car Al* 10 58 41.7906666677 -61 53 12.877505649     14.261   13.76 ~ 7 0
34 V* V789 Car Al* 10 58 59.90 -61 34 43.5     17.774   16.69 ~ 7 0
35 V* V790 Car Al* 10 59 00.08 -61 37 41.7     16.611   15.45 ~ 7 0
36 V* V793 Car Al* 10 59 26.39 -61 36 49.6     16.311   15.41 ~ 6 0
37 V* V796 Car Al* 10 59 41.5132422969 -61 55 15.606390984     16.24   15.45 ~ 15 0
38 V* V797 Car Al* 10 59 41.9087537921 -61 32 34.705425288     16.513   15.57 ~ 5 0
39 V* V798 Car Al* 10 59 49.4717136481 -61 52 08.175382418         15.10 ~ 5 0
40 V* V807 Car Al* 11 05 12.421 -61 14 01.05     17.87   16.21 ~ 6 0
41 V* V809 Car Al* 11 05 33.52 -61 08 45.7     18.178   16.99 ~ 6 0
42 V* V810 Car Al* 11 05 48.77 -60 54 50.9     17.902   16.79 ~ 6 0
43 V* V811 Car Al* 11 05 58.9647730646 -61 10 08.524058758     17.78   16.44 ~ 7 0
44 V* V812 Car Al* 11 06 06.3000591763 -60 56 20.247577014     18.268   16.55 ~ 5 0
45 V* V813 Car Al* 11 06 10.595 -61 14 53.27     17.805 16.2 15.97 ~ 9 1
46 V* V816 Car Al* 11 06 51.087 -61 11 10.45     16.161 16.07 15.05 FV+MV 27 1
47 V* V817 Car Al* 11 06 51.8852934369 -60 51 45.901317321     16.809   15.61 ~ 31 1
48 V* V818 Car EP* 11 06 52.5677006536 -61 14 16.666986216     17.55   16.38 ~ 8 0
49 V* V820 Car Al* 11 07 50.79 -61 05 40.1     17.224   16.17 ~ 5 0
50 V* V821 Car Al* 11 07 53.3475622729 -61 04 18.435432050     16.996   15.94 ~ 7 0
51 V* V824 Car Al* 11 08 37.1155309864 -61 20 17.068432557     15.25   14.53 ~ 8 0
52 V* V828 Car EP* 11 08 57.8935589180 -61 01 29.498297550     16.936   15.75 ~ 6 0
53 V* CM Dra BY* 16 34 20.3299130309 +57 09 44.365524588   14.50 12.87 10.85 9.26 M4.5V 403 0
54 V* V5121 Sgr Al* 17 50 49.57 -30 01 05.9     15.891   14.67 F9V 10 0
55 OGLE-TR 10 EB* 17 51 28.2589927588 -29 52 35.232998832     15.780 16.193 14.92 G2V 84 1
56 V* V5129 Sgr Al* 17 52 18.58 -29 56 25.0     16.848   15.64 F9V 12 1
57 NAME OGLE-TR-56b Pl 17 56 35.5015759807 -29 32 21.476706712           ~ 191 1
58 OGLE-TR 56 EB* 17 56 35.5015759807 -29 32 21.476706712     16.560 16.07 15.30 ~ 158 1
59 NAME V672 Lyr b Pl 19 04 09.8516024106 +36 37 57.445911611           ~ 310 1
60 HD 209458b Pl 22 03 10.7729598762 +18 53 03.548248479           ~ 1468 1
61 HD 209458 V* 22 03 10.7729598762 +18 53 03.548248479   8.21 7.63     F9V 994 1
62 * 51 Peg b Pl 22 57 27.9804167474 +20 46 07.782240714           ~ 524 1
63 NAME Galactic Bulge reg ~ ~           ~ 3391 0

    Equat.    Gal    SGal    Ecl

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2020.07.13-01:31:39

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