2025A&A...696A..44B

Query : 2025A&A...696A..44B

2025A&A...696A..44B - Astronomy and Astrophysics, volume 696A44 (2025/4-1)

TOI-6508 b: A massive transiting brown dwarf orbiting a low-mass star.

BARKAOUI K., SEBASTIAN D., ZUNIGA-FERNANDEZ S., TRIAUD A.H.M.J., RACKHAM B.V., BURGASSER A.J., CARMICHAEL T.W., GILLON M., THEISSEN C., SOFTICH E., ROJAS-AYALA B., SRDOC G., SOUBKIOU A., FUKUI A., TIMMERMANS M., STALPORT M., BURDANOV A., CIARDI D.R., COLLINS K.A., DAVIS Y.T., DAVOUDI F., DE WIT J., DEMORY B.O., DEVENY S., DRANSFIELD G., DUCROT E., FLORIAN L., GAN T., GOMEZ MAQUEO CHEW Y., HOOTON M.J., HOWELL S.B., JENKINS J.M., LITTLEFIELD C., MARTIN E.L., MURGAS F., NIRAULA P., PALLE E., PEDERSEN P.P., POZUELOS F.J., QUELOZ D., RICKER G., SCHWARZ R.P., SEAGER S., SHPORER A., SCOTT M.G., STOCKDALE C. and WINN J.

Abstract (from CDS):

We report the discovery of a transiting brown dwarf orbiting a low-mass star, TOI-6508 b. Today, only ∼50 transiting brown dwarfs have been discovered. TOI-6508 b was first detected with data from the Transiting Exoplanet Survey Satellite (TESS) in Sectors 10, 37 and 63. Ground-based follow-up photometric data were collected with the SPECULOOS-South (Search for habitable Planets EClipsing ULtra-cOOl Stars) and LCOGT-1m telescopes, and RV measurements were obtained with the Near InfraRed Planet Searcher (NIRPS) spectrograph. We find that TOI-6508 b has a mass of Mp = 72.5–5.1+7.6MJup and a radius of Rp = 1.03 ± 0.03 RJup. Our modeling shows that the data are consistent with an eccentric orbit of 19 day and an eccentricity of e = 0.28–0.08+0.09. TOI-6508 b has a mass ratio of MBD/M★ = 0.40, makes it the second highest mass ratio brown dwarf that transits a low-mass star. The host has a mass of M★ = 0.174 ± 0.004 M⊙, a radius of R★ = 0.205 ± 0.006 R⊙, an effective temperature of Teff = 2930 ± 70 K, and a metallicity of [Fe/H] = -0.22 ± 0.08. This makes TOI-6508 b an interesting discovery that has come to light in a region still sparsely populated.

Abstract Copyright: © The Authors 2025

Journal keyword(s): brown dwarfs - stars: individual: TOI-6508

Simbad objects: 81

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Number of rows : 81
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 KELT-1b Pl 00 01 26.9168207928 +39 23 01.784206464           ~ 149 0
2 Wolf 47 PM* 01 03 19.8350070578 +62 21 55.837228636   15.34 13.21 12.4   M5V 232 0
3 TOI-852b BD? 01 38 57.6639620046 -07 16 51.256349916           ~ 12 0
4 Ross 327C LM* 02 14 31.1 +08 04 48           ~ 3 0
5 TOI-263b Pl 02 28 25.9518748896 -25 05 50.545991256           ~ 19 0
6 GPX-1b Pl? 02 33 28.6057674360 +56 01 32.548681642           ~ 19 0
7 NAME TIC 220568520 b LM* 03 05 08.5401967140 -62 51 24.782474853           ~ 5 0
8 HD 20891 BY* 03 23 12.1411589400 +33 04 42.181700412   8.52 7.97     G0 44 1
9 ** TOI 3755B BD* 04 38 59.3 +66 40 16           ~ 3 0
10 TOI-694b LM* 05 09 32.0433967574 -64 01 34.303235465           ~ 9 0
11 HD 274870B BD? 05 28 30.7098553322 -48 24 32.302778259           ~ 13 0
12 HD 245134b Pl 05 35 27.8228087040 +21 17 39.624594180           ~ 4 0
13 TOI-811b BD? 05 52 07.2569953541 -32 55 30.663337365           ~ 16 0
14 CD-57 1311A * 05 55 32.6884884960 -57 17 26.067451956   10.54 10.03 10.077   ~ 5 0
15 ** TOI 2521B LM* 06 14 07.0 -08 03 44           ~ 3 1
16 ** TOI 5467B LM* 06 17 34.5 +28 26 43           ~ 2 0
17 HD 44717B BD? 06 23 18.69 +00 53 00.1           ~ 11 0
18 ** TOI 4759B LM* 06 23 44.2 -24 01 29           ~ 2 0
19 TOI-700 PM* 06 28 23.2285331376 -65 34 45.520447908   14.524 13.076 12.659 10.70 M2V 84 0
20 CoRoT-15b BD? 06 28 27.8204 +06 11 10.477   17.012 15.997 15.807   ~ 49 1
21 TOI-746b Pl 06 38 28.9990799544 -67 38 56.321760732           ~ 8 0
22 CoRoT-34b BD? 06 51 29.0078759736 -03 49 03.456231960           ~ 5 0
23 ** TOI 4737B BD* 06 53 38.5 -13 26 11           ~ 2 0
24 HD 52470b Pl 06 58 59.9803549176 -47 01 24.051948420           ~ 11 0
25 HATS-70b Pl 07 16 25.0880019528 -31 14 39.858342180           ~ 50 0
26 ** TOI 2844B BD* 07 20 48.8 +13 01 07           ~ 3 0
27 TOI-650.01 err 07 21 02.7 -60 09 20           ~ 2 0
28 CD-41 3255B BD? 07 40 24.6582390859 -42 09 16.740639385           ~ 13 0
29 TOI-681b Pl 07 51 34.7953558992 -60 24 44.778352608           ~ 7 0
30 BD+13 1880B BD? 08 17 16.8973986331 +12 36 04.912283928           ~ 20 0
31 TOI-1712.01 LM* 08 31 47.0 +44 49 56           ~ 3 0
32 HD 74162b Pl 08 41 35.0485048464 -22 11 39.578280288           ~ 7 0
33 EPIC 211946007.01 Pl? 08 42 39.4398272616 +19 24 51.898641012           ~ 17 0
34 EPIC 212036875.01 Pl 08 58 45.6699076392 +20 52 08.782143780           ~ 17 0
35 NAME TOI-2543B BD? 09 06 23.26 +03 34 03.7           ~ 8 0
36 LP 261-75 B BD* 09 51 05.49288 +35 58 02.1288           L6V 71 0
37 CD-22 7715 SB* 09 54 52.8927578544 -23 19 55.744444272   11.14 10.71     ~ 19 0
38 Feige 34 HS* 10 39 36.7358839104 +43 06 09.212615280 9.613 10.91 11.14 11.319 11.464 sdOp 731 0
39 TOI-1213b err 10 52 47.9873255359 -67 23 16.132397612           ~ 5 0
40 V* V816 Car EB* 11 06 51.0923613144 -61 11 10.465836036     16.161 16.07 15.05 FV+MV 33 1
41 NAME OGLE-TR 122B BD? 11 06 51.99 -60 51 45.7           ~ 23 1
42 WASP-128b BD? 11 31 26.0933641458 -41 41 22.299023767           ~ 26 0
43 HD 100330 * 11 32 36.6700218936 -32 56 46.898910492   8.38 8.36     A0V 15 0
44 EPIC 201702477.01 Pl? 11 40 57.7883247720 +03 40 53.646749112           ~ 19 0
45 SIPS J1203-3339B BD* 12 03 03.9 -33 39 55           ~ 3 0
46 SIPS J1203-3339 PM* 12 03 03.9379981325 -33 39 55.256285233   18.3   16.7 14.22 M5.0 6 0
47 CD-39 7570 SB* 12 19 21.0336457752 -39 51 25.585123356   11.10 10.32     K0V 30 0
48 HD 113207 PM* 13 02 32.0984300760 -35 06 54.052117848   10.06 9.00     K2III 14 0
49 BD-22 3669B BD? 13 50 20.39 -23 23 00.0           ~ 9 0
50 TOI-2533b BD? 14 10 33.3274828104 +26 25 24.046500684           ~ 8 0
51 NGTS-28Ab Pl 14 11 43.0772304878 -29 58 30.168514543           ~ 3 0
52 ** TOI 3122B LM* 15 07 49.0 -28 09 24           ~ 3 0
53 NGTS-19B BD? 15 16 31.5959069782 -25 42 17.824831139           ~ 11 1
54 CD-33 10463B BD* 15 20 55.3 -33 41 33           ~ 5 0
55 LP 563-38 EB* 15 46 04.3030642435 +04 41 30.066220912           M5.1 45 1
56 2MASS J16033922-1851294 Or* 16 03 39.2319975144 -18 51 29.400368220           M2.5e 43 0
57 NAME StM 274B BD? 16 17 43.2 +26 18 15           ~ 17 0
58 TOI-4462 SB* 18 18 40.7768503104 +36 15 17.530347780   11.52 11.02     ~ 3 1
59 CoRoT-33b Pl? 18 38 33.9102478176 +05 37 28.786272924           ~ 25 0
60 Kepler-486b Pl 18 59 31.1991605400 +49 16 01.172404596           ~ 43 0
61 G 205-57C BD? 19 10 14.284032 +46 57 24.10632           ~ 44 0
62 EPIC 219388192 b BD? 19 17 34.0 -16 52 17           ~ 33 0
63 KOI-607b LM* 19 19 14.1893586444 +40 36 57.043453992           ~ 19 0
64 Kepler-503b Pl 19 22 32.7571535424 +38 42 27.580385304           ~ 20 0
65 2MASS J19265907+0029061 EB* 19 26 59.0803024320 +00 29 06.220432644   17.092 16.049 15.670 14.934 F+D 12 0
66 CoRoT-3b Pl 19 28 13.2642131544 +00 07 18.613986132           ~ 148 1
67 ** TOI 5240B LM* 19 32 20.1 +34 56 25           ~ 2 0
68 KOI-415b Pl? 19 33 13.4494812696 +41 36 22.965562764           ~ 45 0
69 Kepler-492b Pl 19 41 59.1967605000 +42 32 16.400455944           ~ 46 0
70 KOI-686b Pl? 19 47 21.7811918808 +43 38 49.526781576           ~ 34 0
71 Kepler-39b Pl 19 47 50.4745594512 +46 02 03.499726272           ~ 73 1
72 TYC 8779-1890-1 SB* 19 51 18.3506027640 -55 32 46.927320432   13.01 12.24     G2V+M 7 0
73 ZTF J2020+5033 PM* 20 20 03.6318511063 +50 33 39.258130772           ~ 5 0
74 TOI-5882 SB* 20 47 33.2909398056 +34 44 15.237525228   12.077 11.395 11.094   ~ 3 1
75 TOI-1278b BD? 21 21 54.9403734715 +35 38 55.777318896           ~ 23 0
76 ** TOI 3577B BD* 21 48 23.0 +48 20 04           ~ 3 0
77 K2-76b Pl 22 28 25.3435549728 -06 05 12.002165772           ~ 8 0
78 TOI-148b Pl 22 33 16.9634109327 -38 09 34.979984920           ~ 8 0
79 NGTS-7Ab BD? 23 30 05.2358629579 -38 58 11.462828113           ~ 22 0
80 BD+29 4980 SB* 23 43 18.4165031376 +29 55 56.623055412   11.54 10.53 10.31   ~ 15 0
81 WASP-30b BD? 23 53 38.054 -10 07 05.12           ~ 55 1

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