2022MNRAS.510.5464K

Query : 2022MNRAS.510.5464K

2022MNRAS.510.5464K - Mon. Not. R. Astron. Soc., 510, 5464-5485 (2022/March-2)

Transit timings variations in the three-planet system: TOI-270.

KAYE L., VISSAPRAGADA S., GUNTHER M.N., AIGRAIN S., MIKAL-EVANS T., JENSEN E.L.N., PARVIAINEN H., POZUELOS F.J., ABE L., ACTON J.S., AGABI A., ALVES D.R., ANDERSON D.R., ARMSTRONG D.J., BARKAOUI K., BARRAGAN O., BENNEKE B., BOYD P.T., BRAHM R., BRUNI I., BRYANT E.M., BURLEIGH M.R., CASEWELL S.L., CIARDI D., CLOUTIER R., COLLINS K.A., COLLINS K.I., CONTI D.M., CROSSFIELD I.J.M., CROUZET N., DAYLAN T., DRAGOMIR D., DRANSFIELD G., FABRYCKY D., FAUSNAUGH M., FUURESZ G., GAN T., GILL S., GILLON M., GOAD M.R., GORJIAN V., GREKLEK-MCKEON M., GUERRERO N., GUILLOT T., JEHIN E., JENKINS J.S., LENDL M., KAMLER J., KANE S.R., KIELKOPF J.F., KUNIMOTO M., MARIE-SAINTE W., McCORMAC J., MEKARNIA D., MORALES F.Y., MOYANO M., PALLE E., PARMENTIER V., RELLES H.M., SCHMIDER F.-X., SCHWARZ R.P., SEAGER S., SMITH A.M.S., TAN T.-G., TAYLOR J., TRIAUD A.H.M.J., TWICKEN J.D., UDRY S., VINES J.I., WANG G., WHEATLEY P.J. and WINN J.N.

Abstract (from CDS):

We present ground- and space-based photometric observations of TOI-270 (L231-32), a system of three transiting planets consisting of one super-Earth and two sub-Neptunes discovered by TESS around a bright (K-mag = 8.25) M3V dwarf. The planets orbit near low-order mean-motion resonances (5:3 and 2:1) and are thus expected to exhibit large transit timing variations (TTVs). Following an extensive observing campaign using eight different observatories between 2018 and 2020, we now report a clear detection of TTVs for planets c and d, with amplitudes of ∼10 min and a super-period of ∼3 yr, as well as significantly refined estimates of the radii and mean orbital periods of all three planets. Dynamical modelling of the TTVs alone puts strong constraints on the mass ratio of planets c and d and on their eccentricities. When incorporating recently published constraints from radial velocity observations, we obtain masses of Mb=1.48±0.18 M_⊕, Mc=6.20±0.31 M_⊕, and Md=4.20±0.16 M_⊕for planets b, c, and d, respectively. We also detect small but significant eccentricities for all three planets : eb = 0.0167 ± 0.0084, ec = 0.0044 ± 0.0006, and ed = 0.0066 ± 0.0020. Our findings imply an Earth-like rocky composition for the inner planet, and Earth-like cores with an additional He/H2O atmosphere for the outer two. TOI-270 is now one of the best constrained systems of small transiting planets, and it remains an excellent target for atmospheric characterization.

Abstract Copyright: © 2021 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society

Journal keyword(s): planets and satellites: composition - planets and satellites: formation - planets and satellites: fundamental parameters

Simbad objects: 15

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Number of rows : 15
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 L 231-32d Pl 04 33 39.7200127728 -51 57 22.435373160           ~ 128 0
2 NAME L 231-32b Pl 04 33 39.7200127728 -51 57 22.435373160           ~ 49 0
3 NAME L 231-32c Pl 04 33 39.7200127728 -51 57 22.435373160           ~ 45 0
4 L 231-32 PM* 04 33 39.7200127728 -51 57 22.435373160     12.617 12.147   M3.0V 83 0
5 TOI-216 PM* 04 55 55.2548838048 -63 15 36.313162056           ~ 58 0
6 BD+73 323b Pl 06 19 10.3709236992 +73 49 39.587215008           ~ 33 0
7 K2-19 * 11 39 50.4803341248 +00 36 12.875047920   13.80 13.00 12.88   G7 75 0
8 CD-24 12581 PM* 16 10 17.6976776832 -24 59 25.260709632   12.22 11.28     ~ 58 0
9 NAME G 139-21b Pl 17 15 18.9339850845 +04 57 50.066612336           ~ 845 1
10 Kepler-9 Er* 19 02 17.7544327200 +38 24 03.176851896     13.9 13.791   G2 223 1
11 Kepler-19 Er* 19 21 40.9995019176 +37 51 06.437281140   12.88 12.04 11.888   F9 112 1
12 Kepler-51 Er* 19 45 55.1428629456 +49 56 15.650520684       14.829   G4 165 1
13 Kepler-223 Er* 19 53 16.4202435936 +47 16 46.308434088   16.209 15.570 15.78   ~ 192 1
14 WASP-47 * 22 04 48.7261549272 -12 01 07.998743676     11.99 11.82   ~ 217 1
15 TRAPPIST-1 LM* 23 06 29.3684948589 -05 02 29.037301866     18.798 16.466 14.024 M7.5e 1306 0

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