2023A&A...677A..38B

Query : 2023A&A...677A..38B

2023A&A...677A..38B - Astronomy and Astrophysics, volume 677A38 (2023/9-1)

TOI-2084 b and TOI-4184 b: Two new sub-Neptunes around M dwarf stars.

BARKAOUI K., TIMMERMANS M., SOUBKIOU A., RACKHAM B.V., BURGASSER A.J., CHOUQAR J., POZUELOS F.J., COLLINS K.A., HOWELL S.B., SIMCOE R., MELIS C., STASSUN K.G., TREGLOAN-REED J., COINTEPAS M., GILLON M., BONFILS X., FURLAN E., GNILKA C.L., ALMENARA J.M., ALONSO R., BENKHALDOUN Z., BONAVITA M., BOUCHY F., BURDANOV A., CHINCHILLA P., DAVOUDI F., DELREZ L., DEMANGEON O., DOMINIK M., DEMORY B.-O., DE WIT J., DRANSFIELD G., DUCROT E., FUKUI A., HINSE T.C., HOOTON M.J., JEHIN E., JENKINS J.M., JORGENSEN U.G., LATHAM D.W., GARCIA L., CARRAZCO-GAXIOLA S., GHACHOUI M., GOMEZ MAQUEO CHEW Y., GUNTHER M.N., McCORMAC J., MURGAS F., MURRAY C.A., NARITA N., NIRAULA P., PEDERSEN P.P., QUELOZ D., REBOLO-LOPEZ R., RICKER G., SABIN L., SAJADIAN S., SCHANCHE N., SCHWARZ R.P., SEAGER S., SEBASTIAN D., SEFAKO R., SOHY S., SOUTHWORTH J., SRDOC G., THOMPSON S.J., TRIAUD A.H.M.J., VANDERSPEK R., WELLS R.D., WINN J.N. and ZUNIGA-FERNANDEZ S.

Abstract (from CDS):

We present the discovery and validation of two TESS exoplanets orbiting nearby M dwarfs: TOI-2084 b, and TOI-4184b. We characterized the host stars by combining spectra from Shane/Kast and Magellan/FIRE, spectral energy distribution analysis, and stellar evolutionary models. In addition, we used Gemini-South/Zorro & -North/Alopeke high-resolution imaging, archival science images, and statistical validation packages to support the planetary interpretation. We performed a global analysis of multi-colour photometric data from TESS and ground-based facilities in order to derive the stellar and planetary physical parameters for each system. We find that TOI-2084 band TOI-4184 bare sub-Neptune-sized planets with radii of Rp = 2.47 ± 0.13R⊕ and Rp = 2.43 ± 0.21 R⊕, respectively. TOI-2084 b completes an orbit around its host star every 6.08 days, has an equilibrium temperature of Teq = 527 ± 8 K and an irradiation of Sp = 12.8 ± 0.8 S⊕. Its host star is a dwarf of spectral M2.0 ± 0.5 at a distance of 114 pc with an effective temperature of Teff = 3550 ± 50 K, and has a wide, co-moving M8 companion at a projected separation of 1400 au. TOI-4184 b orbits around an M5.0 ± 0.5 type dwarf star (Kmag = 11.87) each 4.9 days, and has an equilibrium temperature of Teq = 412 ± 8 K and an irradiation of Sp = 4.8 ± 0.4 S⊕. TOI-4184 is a metal poor star ([Fe/H] = -0.27 ± 0.09 dex) at a distance of 69 pc with an effective temperature of Teff = 3225 ± 75 K. Both planets are located at the edge of the sub-Jovian desert in the radius-period plane. The combination of the small size and the large infrared brightness of their host stars make these new planets promising targets for future atmospheric exploration with JWST.

Abstract Copyright: © The Authors 2023

Journal keyword(s): techniques: photometric - stars: low-mass

Simbad objects: 34

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Number of rows : 34
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 NAME LP 645-50b Pl 00 35 13.2191111363 -03 22 14.288032174           ~ 9 0
2 Wolf 47 PM* 01 03 19.8350070578 +62 21 55.837228636   15.34 13.21 12.4   M5V 232 0
3 TOI-4148.01 err 02 00 05.0 +77 22 08           ~ 3 0
4 LP 469-206 PM* 02 16 29.8513937296 +13 35 12.783947560   17.77   15.635   M5.0Ve 72 0
5 NAME PM J02489-1432Wb Pl 02 48 59.2728446101 -14 32 14.942011299           ~ 22 0
6 2MASS J02542961-7941578 * 02 54 29.61144 -79 41 57.8184           ~ 1 0
7 TOI-4184b Pl 02 55 18.3882623976 -79 24 55.506042288           ~ 2 0
8 SCR J0255-7924 PM* 02 55 18.3882623976 -79 24 55.506042288   18.25   16.21 14.20 M5.5 8 0
9 DENIS J025518.6-792506 * 02 55 18.7043481257 -79 25 06.976004266         18.091 ~ 1 0
10 2MASS J02581731-7913567 * 02 58 17.31720 -79 13 56.7192           ~ 1 0
11 BD-17 588 ** 03 01 51.3895517 -16 35 36.110284           M3.5+M3.0 73 0
12 2MASS J03025068-7918174 * 03 02 50.68128 -79 18 17.4240           ~ 1 0
13 2MASS J03025970-7941390 PM* 03 02 59.7006607616 -79 41 39.159921044           ~ 3 0
14 TOI-1696b Pl 04 21 07.3353286170 +48 49 11.687405021           ~ 9 0
15 TOI-269b Pl 05 03 23.0610114456 -54 10 37.924879404           ~ 25 0
16 HD 45039 * 06 18 14.1135854712 -72 07 55.923169152   7.82 7.74     A0V 20 0
17 TOI-620b Pl 09 28 41.5890982465 -12 09 55.752657397           ~ 10 0
18 TOI-2096c Pl 10 06 28.5905621766 +74 49 39.122852833           ~ 5 0
19 TOI-2257b Pl 12 58 57.6816623624 +77 39 41.689782344           ~ 11 0
20 TOI-2048b Pl 15 51 41.8029191904 +52 18 22.731562260           ~ 6 0
21 TOI-2048 Em* 15 51 41.8029191904 +52 18 22.731562260   12.32 11.43     G9 30 0
22 2MASS J17170042+7244364 LM* 17 17 00.3839404205 +72 44 36.666848570           M9 3 0
23 TOI-2084.02 err 17 17 00.9 +72 44 49           ~ 2 0
24 TOI-2084 PM* 17 17 00.9230445932 +72 44 48.713466932   16.668 15.115 14.927   M2 10 0
25 TOI-2084b Pl 17 17 00.9230445932 +72 44 48.713466932           ~ 4 0
26 SDSS J171704.06+724449.4 * 17 17 04.0690224013 +72 44 49.521649474           ~ 1 0
27 TOI-2081b Pl 17 37 12.7357669344 +53 01 32.531697480           ~ 5 0
28 LSPM J1844+3633b Pl 18 44 42.3658884696 +36 33 44.530295652           ~ 16 0
29 TOI-1452 PM* 19 20 41.7258970920 +73 11 43.537714476           M4.5 32 0
30 TOI-1760 PM* 19 20 41.7297954096 +73 11 46.849996608           ~ 10 0
31 TOI-4479b Pl 21 04 23.1618162316 +24 39 15.102672052           ~ 7 0
32 TOI-122b Pl 22 11 47.2993627416 -58 56 42.251593524           ~ 7 0
33 Feige 110 HS* 23 19 58.3996844256 -05 09 56.171142864 10.360 11.45 11.50 11.970 12.145 sdO8VIIIHe5 673 1
34 TOI-237b Pl 23 32 58.2700309449 -29 24 54.190916756           ~ 15 0

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