2022AJ....163..156M

Query : 2022AJ....163..156M

2022AJ....163..156M - Astron. J., 163, 156-156 (2022/April-0)

TESS Hunt for Young and Maturing Exoplanets (THYME). VI. An 11 Myr Giant Planet Transiting a Very-low-mass Star in Lower Centaurus Crux.

MANN A.W., WOOD M.L., SCHMIDT S.P., BARBER M.G., OWEN J.E., TOFFLEMIRE B.M., NEWTON E.R., MAMAJEK E.E., BUSH J.L., MACE G.N., KRAUS A.L., THAO P.C., VANDERBURG A., LLAMA J., JOHNS-KRULL C.M., PRATO L., STAHL A.G., TANG S.-Y., FIELDS M.J., COLLINS K.A., COLLINS K.I., GAN T., JENSEN E.L.N., KAMLER J., SCHWARZ R.P., FURLAN E., GNILKA C.L., HOWELL S.B., LESTER K.V., OWENS D.A., SUAREZ O., MEKARNIA D., GUILLOT T., ABE L., TRIAUD A.H.M.J., JOHNSON M.C., MILBURN R.P., RIZZUTO A.C., QUINN S.N., KERR R., RICKER G.R., VANDERSPEK R., LATHAM D.W., SEAGER S., WINN J.N., JENKINS J.M., GUERRERO N.M., SHPORER A., SCHLIEDER J.E., McLEAN B. and WOHLER B.

Abstract (from CDS):

Mature super-Earths and sub-Neptunes are predicted to be ≃ Jovian radius when younger than 10 Myr. Thus, we expect to find 5-15 R⊕ planets around young stars even if their older counterparts harbor none. We report the discovery and validation of TOI 1227b, a 0.85 ± 0.05 R J (9.5 R ⊕) planet transiting a very-low-mass star (0.170 ± 0.015 M ☉) every 27.4 days. TOI 1227's kinematics and strong lithium absorption confirm that it is a member of a previously discovered subgroup in the Lower Centaurus Crux OB association, which we designate the Musca group. We derive an age of 11 ± 2 Myr for Musca, based on lithium, rotation, and the color-magnitude diagram of Musca members. The TESS data and ground-based follow-up show a deep (2.5%) transit. We use multiwavelength transit observations and radial velocities from the IGRINS spectrograph to validate the signal as planetary in nature, and we obtain an upper limit on the planet mass of ≃0.5 M J. Because such large planets are exceptionally rare around mature low-mass stars, we suggest that TOI 1227b is still contracting and will eventually turn into one of the more common <5 R ⊕ planets.

Abstract Copyright: © 2022. The American Astronomical Society. All rights reserved.

Journal keyword(s): Pre-main sequence stars - Transits - Exoplanet evolution - Exoplanet formation - Stellar associations - Stellar ages - OB associations - Time domain astronomy - Time series analysis - Late-type stars - Low mass stars

VizieR on-line data: <Available at CDS (J/AJ/163/156): table2.dat table5.dat>

Status at CDS : All or part of tables of objects could be ingested in SIMBAD with priority 2.

Simbad objects: 29

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Number of rows : 29
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 THA MGr 00 00 -62.0           ~ 540 0
2 V* V1298 Tau TT* 04 05 19.5909996648 +20 09 25.563233736   11.11 10.12 9.57   K1 194 0
3 K2-25 PM* 04 13 05.6131374072 +15 14 52.018080576   15.81 15.56 13.72   M4.5V 108 0
4 K2-25b Pl 04 13 05.6131374072 +15 14 52.018080576           ~ 108 0
5 Cl Melotte 25 OpC 04 30 27.4 +16 46 43           ~ 3309 0
6 TOI-942 * 05 06 35.8911413136 -20 14 44.143841292   12.899 11.963 11.647   K2.2V 42 0
7 NAME Columba Association As* 06 04 19.4 -22 20 40           ~ 337 0
8 NGC 2632 OpC 08 39 58.4 +19 36 33           ~ 1733 0
9 CPD-63 1435 * 10 28 08.9903170248 -64 30 18.936383436   11.12 10.64     ~ 54 0
10 NAME eps Cha Association OpC 11 59 51 -78 12.4           ~ 188 0
11 TOI-1880 Y*? 12 10 54.4433698800 -75 07 54.830626788       15.866   ~ 8 0
12 NAME Lower Centaurus Crux As* 12 19 -57.1           ~ 565 1
13 NAME Musca Cld 12 23 -71.3           ~ 258 0
14 NGC 4372 GlC 12 25 45.43 -72 39 32.7   10.86 9.85     ~ 327 0
15 2RXP J122703.8-722702 X 12 27 03.3 -72 27 04           ~ 2 0
16 TOI-1227b Pl 12 27 04.3053248184 -72 27 06.492769776           ~ 30 0
17 TOI-1227 Y*? 12 27 04.3053248184 -72 27 06.492769776           M4.5V 40 0
18 HD 108342 PM* 12 27 30.4682901744 -72 27 18.901994508   9.45 8.94     F8V 17 0
19 HD 120411 * 13 50 06.2797027704 -40 50 08.881076364   10.45 9.80     G0V 78 0
20 HD 120411b Pl 13 50 06.2797027704 -40 50 08.881076364           ~ 60 0
21 NAME beta Pic Moving Group MGr 14 30 -42.0           ~ 894 0
22 K2-33b Pl 16 10 14.7377409264 -19 19 09.407629452           ~ 93 0
23 NAME Upper Sco Association As* 16 12 -23.4           ~ 1586 1
24 NAME Upper Sco-Cen As* 16 15 -24.2           ~ 1497 1
25 HD 197481 BY* 20 45 09.5324974119 -31 20 27.237889841   10.05 8.627 9.078 6.593 M1VeBa1 1344 0
26 HD 197481b Pl 20 45 09.5324974119 -31 20 27.237889841           ~ 158 0
27 HD 222259A RS* 23 39 39.4808078664 -69 11 44.707735104   9.161 8.226 9.28 7.352 G6V 190 0
28 NAME Carina Association As* ~ ~           ~ 188 1
29 NAME e Tau Association MGr ~ ~           ~ 20 0

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