2021AJ....162..167F

Query : 2021AJ....162..167F

2021AJ....162..167F - Astron. J., 162, 167-167 (2021/October-0)

TOI-1749: an M dwarf with a trio of planets including a near-resonant pair.

FUKUI A., KORTH J., LIVINGSTON J.H., TWICKEN J.D., ZAPATERO OSORIO M.R., JENKINS J.M., MORI M., MURGAS F., OGIHARA M., NARITA N., PALLE E., STASSUN K.G., NOWAK G., CIARDI D.R., ALVAREZ-HERNANDEZ L., BEJAR V.J.S., CASASAYAS-BARRIS N., CROUZET N., DE LEON J.P., ESPARZA-BORGES E., SOTO D.H., ISOGAI K., KAWAUCHI K., KLAGYIVIK P., KODAMA T., KURITA S., KUSAKABE N., LUQUE R., MADRIGAL-AGUADO A., MONTANES RODRIGUEZ P., MORELLO G., NISHIUMI T., ORELL-MIQUEL J., OSHAGH M., PARVIAINEN H., SANCHEZ-BENAVENTE M., STANGRET M., TERADA Y., WATANABE N., CHEN G., TAMURA M., BOSCH-CABOT P., BOWEN M., EASTRIDGE K., FREOUR L., GONZALES E., GUERRA P., JUNDIYEH Y., KIM T.K., KROER L.V., LEVINE A.M., MORGAN E.H., REEFE M., TRONSGAARD R., WEDDERKOPP C.K., WITTROCK J., COLLINS K.A., HESSE K., LATHAM D.W., RICKER G.R., SEAGER S., VANDERSPEK R., WINN J., BACHELET E., BOWMAN M., McCULLY C., DAILY M., HARBECK D. and VOLGENAU N.H.

Abstract (from CDS):

We report the discovery of one super-Earth- (TOI-1749b) and two sub-Neptune-sized planets (TOI-1749c and TOI-1749d) transiting an early M dwarf at a distance of 100 pc, which were first identified as planetary candidates using data from the TESS photometric survey. We have followed up this system from the ground by means of multiband transit photometry, adaptive optics imaging, and low-resolution spectroscopy, from which we have validated the planetary nature of the candidates. We find that TOI-1749b, c, and d have orbital periods of 2.39, 4.49, and 9.05 days, and radii of 1.4, 2.1, and 2.5 R⊕, respectively. We also place 95% confidence upper limits on the masses of 57, 14, and 15 M⊕ for TOI-1749b, c, and d, respectively, from transit timing variations. The periods, sizes, and tentative masses of these planets are in line with a scenario in which all three planets initially had a hydrogen envelope on top of a rocky core, and only the envelope of the innermost planet has been stripped away by photoevaporation and/or core-powered mass-loss mechanisms. These planets are similar to other planetary trios found around M dwarfs, such as TOI-175b,c,d and TOI-270b,c,d, in the sense that the outer pair has a period ratio within 1% of 2. Such a characteristic orbital configuration, in which an additional planet is located interior to a near 2:1 period-ratio pair, is relatively rare around FGK dwarfs.

Abstract Copyright: © 2021. The American Astronomical Society. All rights reserved.

Journal keyword(s): Transits - Exoplanet detection methods - Transit duration variation method - Super Earths - Mini Neptunes - M dwarf stars

VizieR on-line data: <Available at CDS (J/AJ/162/167): table5.dat>

Simbad objects: 19

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Number of rows : 19
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 WT 2353 PM* 00 29 12.3029193648 -30 27 13.466857032   13.05 11.95     ~ 102 0
3 TOI-178b Pl 00 29 12.3029193648 -30 27 13.466857032           ~ 29 0
4 TOI-178c Pl 00 29 12.3029193648 -30 27 13.466857032           ~ 29 0
5 Cl Melotte 22 OpC 03 46 38.0 +24 10 41           ~ 3679 0
6 NAME L 231-32c Pl 04 33 39.7200127728 -51 57 22.435373160           ~ 45 0
7 NAME L 231-32d Pl 04 33 39.7200127728 -51 57 22.435373160           ~ 128 0
8 NAME L 231-32b Pl 04 33 39.7200127728 -51 57 22.435373160           ~ 49 0
9 L 231-32 PM* 04 33 39.7200127728 -51 57 22.435373160     12.617 12.147   M3.0V 83 0
10 BD+52 913 WD* 05 05 30.6180977592 +52 49 51.919301604 10.25 11.44 11.69 11.93 12.108 DA.8 1153 0
11 L 98-59 PM* 08 18 07.6214406393 -68 18 46.805365587   13.22 11.685 11.294 9.25 M3V 135 0
12 NAME L 98-59 c Pl 08 18 07.6214406393 -68 18 46.805365587           ~ 86 0
13 NAME L 98-59 d Pl 08 18 07.6214406393 -68 18 46.805365587           ~ 98 0
14 NAME L 98-59 b Pl 08 18 07.6214406393 -68 18 46.805365587           ~ 67 0
15 NAME beta Pic Moving Group MGr 14 30 -42.0           ~ 894 0
16 TOI-1749d Pl 18 50 57.0647942175 +64 25 09.119009331           ~ 5 0
17 TOI-1749c Pl 18 50 57.0647942175 +64 25 09.119009331           ~ 6 0
18 TOI-1749b Pl 18 50 57.0647942175 +64 25 09.119009331           ~ 4 0
19 TOI-1749 PM* 18 50 57.0647942175 +64 25 09.119009331   15.126 13.809 13.352   ~ 23 0

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