2020AJ....160..133M


Query : 2020AJ....160..133M

2020AJ....160..133M - Astron. J., 160, 133-133 (2020/September-0)

TOI 694b and TIC 220568520b: two low-mass companions near the hydrogen-burning mass limit orbiting Sun-like stars.

MIRELES I., SHPORER A., GRIEVES N., ZHOU G., GUNTHER M.N., BRAHM R., ZIEGLER C., STASSUN K.G., HUANG C.X., NIELSEN L., DOS SANTOS L.A., UDRY S., BOUCHY F., IRELAND M., WALLACE A., SARKIS P., HENNING T., JORDAN A., LAW N., MANN A.W., PAREDES L.A., JAMES H.-S., JAO W.-C., HENRY T.J., BUTLER R.P., RODRIGUEZ J.E., YU L., FLOWERS E., RICKER G.R., LATHAM D.W., VANDERSPEK R., SEAGER S., WINN J.N., JENKINS J.M., FURESZ G., HESSE K., QUINTANA E.V., ROSE M.E., SMITH J.C., TENENBAUM P., VEZIE M., YAHALOMI D.A. and ZHAN Z.

Abstract (from CDS):

We report the discovery of TOI 694 b and TIC 220568520 b, two low-mass stellar companions in eccentric orbits around metal-rich Sun-like stars, first detected by the Transiting Exoplanet Survey Satellite (TESS). TOI 694 b has an orbital period of 48.05131 ± 0.00019 days and eccentricity of 0.51946 ± 0.00081, and we derive a mass of 89.0 ± 5.3 MJup (0.0849 ± 0.0051 M) and radius of 1.111 ± 0.017 RJup (0.1142 ± 0.0017 R). TIC 220568520 b has an orbital period of 18.55769 ± 0.00039 days and eccentricity of 0.0964 ± 0.0032, and we derive a mass of 107.2 ± 5.2 MJup (0.1023 ± 0.0050 M) and radius of 1.248 ± 0.018 RJup (0.1282 ± 0.0019 R). Both binary companions lie close to and above the hydrogen-burning mass threshold that separates brown dwarfs and the lowest-mass stars, with TOI 694 b being 2σ above the canonical mass threshold of 0.075 M. The relatively long periods of the systems mean that the magnetic fields of the low-mass companions are not expected to inhibit convection and inflate the radius, which according to one leading theory is common in similar objects residing in short-period tidally synchronized binary systems. Indeed we do not find radius inflation for these two objects when compared to theoretical isochrones. These two new objects add to the short but growing list of low-mass stars with well-measured masses and radii, and highlight the potential of the TESS mission for detecting such rare objects orbiting bright stars.

Abstract Copyright: © 2020. The American Astronomical Society. All rights reserved.

Journal keyword(s): Low mass stars - M dwarf stars - Eclipsing binary stars

Status at CDS : All or part of tables of objects will be ingested in SIMBAD with priority 1.

Simbad objects: 71

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Number of rows : 71
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 KELT-1 * 00 01 26.9168207928 +39 23 01.784206464   11.23 10.63     ~ 44 0
2 TYC 2291-1627-1 EB* 01 13 51.2969940264 +31 49 09.757524180   10.61 10.11     M 15 0
3 HD 10069 * 01 37 25.0332798696 -45 40 40.374717456   9.74 9.30     F6IV/V 190 1
4 2MASS J01400127-5431218 PM* 01 40 01.2538819392 -54 31 21.660241008   13.289 12.625     ~ 4 0
5 TYC 8863-203-1 * 03 05 08.5400272920 -62 51 24.779359944   13.33 12.04     ~ 1 0
6 NAME TIC 220568520 b LM* 03 05 08.5401967140 -62 51 24.782474853           ~ 2 0
7 TYC 67-354-1 SB* 03 39 09.6380569440 +03 05 37.670638992   11.73 11.38     ~ 4 0
8 BD+57 793 * 04 21 52.7048156328 +57 49 01.889294952   10.27 9.85     F5V 143 2
9 2MASS J04463285+1901432 EB* 04 46 32.8622247312 +19 01 43.246330320   19.9 19.0     M 24 0
10 GSC 06465-00602 ** 04 48 23.3159534736 -24 50 16.879808400   14.052 13.605     ~ 9 0
11 TOI-694 * 05 09 32.0430128160 -64 01 34.301933472   12.761 11.925 11.835 11.14 ~ 7 0
12 TOI-694b LM* 05 09 32.0433967574 -64 01 34.303235465           ~ 3 0
13 HD 274870 * 05 28 30.7095265728 -48 24 32.302396404   13.05 11.95     F5 6 0
14 TYC 6493-290-1 ** 05 40 46.1693610648 -24 55 35.178948912   12.79 12.058     ~ 8 0
15 GSC 06493-00315 ** 05 42 49.1144333592 -25 59 47.445947592   13.580 13.114     ~ 10 0
16 TYC 8527-329-1 SB* 05 43 51.4708541544 -57 09 48.620946996   12.45 11.67     ~ 8 0
17 LP 837-20 EB* 05 44 57.9330491832 -24 56 09.713268096     15.29     M4.5Ve 15 0
18 CD-57 1311 SB* 05 55 32.62392 -57 17 26.1312           ~ 19 0
19 GSC 05946-00892 ** 06 16 00.6523000536 -21 15 23.830926408   13.694 13.189     ~ 5 0
20 CoRoT-15 EB* 06 28 27.8224597512 +06 11 10.451925852   17.01 16.00 15.81 14.83 F7V 17 1
21 HATS-70 * 07 16 25.0880019528 -31 14 39.858342180   12.07 12.23     ~ 13 0
22 CD-41 3255 * 07 40 24.6580320552 -42 09 16.743124440   10.85 10.09     ~ 6 0
23 BD+13 1880 * 08 17 16.8973753152 +12 36 04.908944304   9.842 9.610 9.516   ~ 7 0
24 Cl* NGC 2632 HSHJ 430 EB* 08 42 39.4398272616 +19 24 51.898641012           M3.9 30 0
25 2MASS J08504984+1948364 EB* 08 50 49.8423820800 +19 48 36.547637508           M5V 32 0
26 TYC 1400-1873-1 * 08 58 45.6699076392 +20 52 08.782143780   11.65 10.95     ~ 5 0
27 LP 261-75 LM* 09 51 04.5755715720 +35 58 09.461810208   16.1   14.2   M4.5Ve 41 0
28 TYC 6604-547-1 * 09 54 52.8927578544 -23 19 55.744444272   11.14 10.71     ~ 8 0
29 TYC 245-630-1 SB* 10 13 50.8314491832 +01 59 28.227909696   12.05 11.87     ~ 8 0
30 EBLM J1038-37 EB* 10 38 24.4774324080 -37 50 17.989384452           ~ 5 0
31 V* V764 Car EB* 10 53 51.1166673312 -61 34 13.644573348     17.71   16.53 ~ 22 0
32 V* V783 Car EB* 10 57 51.8344468224 -61 43 58.834463808     16.431   15.82 ~ 13 0
33 V* V816 Car EB* 11 06 51.0923613144 -61 11 10.465836036     16.161 16.07 15.05 FV+MV 30 1
34 V* V817 Car EB* 11 06 51.8853827760 -60 51 45.902051712     16.809   15.61 ~ 33 1
35 UCAC4 268-060668 * 11 15 59.6434832040 -36 27 33.853060656   12.891 12.390 12.388   ~ 3 0
36 WASP-128 * 11 31 26.0933129952 -41 41 22.301154528   12.98 12.37 12.36 11.74 G0V 8 0
37 UCAC2 33047398 * 11 40 57.7883247720 +03 40 53.646749112   15.272 14.569 14.606   ~ 13 0
38 CD-39 7570 EB* 12 19 21.0336457752 -39 51 25.585123356   11.10 10.32     K0V 16 0
39 EBLM J1431-11 EB* 14 31 52.1470814088 -11 18 40.439462148           ~ 5 0
40 LP 563-38 EB* 15 46 04.3030642435 +04 41 30.066220912   17.1   15.0   M5.1 31 1
41 UGCS J160339.22-185129.4 EB* 16 03 39.2319975144 -18 51 29.400368220           M2.5e 22 0
42 K2-51 LM* 16 27 14.6772870024 -27 57 25.337602944       12.89   ~ 8 0
43 CoRoT-27 * 18 33 58.9993615272 +05 32 18.324717936           ~ 11 0
44 CoRoT-33 * 18 38 33.9102478176 +05 37 28.786272924   15.705   14.2 13.5 ~ 9 0
45 [DCO2008] T-Lyr1-01662 SB* 18 59 02.8573447224 +48 36 35.561671020   11.87 11.65 11.525   F3V 13 0
46 Kepler-486 Ro* 18 59 31.1991605400 +49 16 01.172404596           ~ 44 0
47 G 205-57C BD? 19 10 14.284032 +46 57 24.10632           ~ 35 0
48 Kepler-16 EB* 19 16 18.1758378936 +51 45 26.782726104   12.1   11.90   K7V 225 1
49 UCAC4 366-166973 ** 19 17 34.0314284136 -16 52 17.793243804   13.28 12.54 12.39   ~ 27 0
50 KOI-607 Ro* 19 19 14.1892895472 +40 36 57.043732140           G5V 29 0
51 Kepler-503 Ro* 19 22 32.7571535424 +38 42 27.580385304           ~ 35 0
52 KOI-362 EB* 19 23 59.2554767856 +37 11 57.177016728       13.78   ~ 33 2
53 Kepler-75 Ro* 19 24 33.0185656152 +36 34 38.477691264   16.2   14.9   ~ 55 1
54 KOI-6893 EB* 19 24 36.1503477288 +43 17 07.135360692           ~ 15 0
55 2MASS J19265907+0029061 EB* 19 26 59.0803024320 +00 29 06.220432644   17.092 16.049 15.670 14.934 F+D 9 0
56 CoRoT-3 EB* 19 28 13.2642131544 +00 07 18.613986132   14.199 13.292 13.099 12.54 F3V 72 1
57 KOI-415 Ro* 19 33 13.4494812696 +41 36 22.965562764           ~ 41 0
58 2MASS J19350355+3631165 EB* 19 35 03.5536693080 +36 31 16.532966172           M 13 0
59 Kepler-492 Ro* 19 41 59.1967605000 +42 32 16.400455944           ~ 41 1
60 KOI-686 EB* 19 47 21.7811918808 +43 38 49.526781576           ~ 47 0
61 Kepler-39 Ro* 19 47 50.4745594512 +46 02 03.499726272   14.9   14.43   F8V 49 1
62 TYC 500-1187-1 Ro* 20 17 35.8427243880 +02 15 51.096886272   11.83 11.39     ~ 5 0
63 K2-67 LM* 22 14 25.5212188824 -10 39 10.014713568           ~ 8 0
64 K2-76 LM* 22 28 25.3435549728 -06 05 12.002165772           ~ 9 0
65 CPD-68 3538 * 22 50 59.9743541424 -67 30 54.190507140   11.162 10.703 10.42   ~ 13 0
66 1SWASP J230808.34+333803.9 EB* 23 08 08.3429939160 +33 38 03.955818408   11.23 10.66     ~ 17 0
67 TYC 8448-418-1 * 23 08 45.6742747536 -46 06 36.716465412   11.73 11.35     ~ 5 0
68 NGTS-7A * 23 30 05.2354214952 -38 58 11.470666584           ~ 7 0
69 BD+29 4980 EB* 23 43 18.4165031376 +29 55 56.623055412   11.54 10.53 10.31   ~ 8 0
70 TYC 7519-142-1 SB* 23 49 15.2397740040 -32 46 17.466168252   12.14 11.52     ~ 5 0
71 WASP-30 * 23 53 38.0549675760 -10 07 05.095516692   12.15 11.91 11.51 10.83 F8V 32 0

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2022.09.27-01:06:49

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