2024A&A...688A.211L

Query : 2024A&A...688A.211L

2024A&A...688A.211L - Astronomy and Astrophysics, volume 688A211 (2024/8-1)

Photo-dynamical characterisation of the TOI-178 resonant chain Exploring the robustness of transit-timing variations and radial velocity mass characterisations.

LELEU A., DELISLE J.-B., DELREZ L., BRYANT E.M., BRANDEKER A., OSBORN H.P., HARA N., WILSON T.G., BILLOT N., LENDL M., EHRENREICH D., CHAKRABORTY H., GUNTHER M.N., HOOTON M.J., ALIBERT Y., ALONSO R., ALVES D.R., ANDERSON D.R., APERGIS I., ARMSTRONG D., BARCZY T., BARRADO NAVASCUES D., BARROS S.C.C., BATTLEY M.P., BAUMJOHANN W., BAYLISS D., BECK T., BENZ W., BORSATO L., BROEG C., BURLEIGH M.R., CASEWELL S.L., COLLIER CAMERON A., CORREIA A.C.M., CSIZMADIA S., CUBILLOS P.E., DAVIES M.B., DELEUIL M., DELINE A., DEMANGEON O.D.S., DEMORY B.-O., DEREKAS A., EDWARDS B., ERIKSON A., FORTIER A., FOSSATI L., FRIDLUND M., GANDOLFI D., GAZEAS K., GILLEN E., GILLON M., GOAD M.R., GUDEL M., HAWTHORN F., HEITZMANN A., HELLING C., ISAAK K.G., JENKINS J.S., JENKINS J.M., KENDALL A., KISS L.L., KORTH J., LAM K.W.F., LASKAR J., LATHAM D.W., LECAVELIER DES ETANGS A., MAGRIN D., MAXTED P.F.L., McCORMAC J., MORDASINI C., MOYANO M., NASCIMBENI V., OLOFSSON G., OSBORN A., OTTENSAMER R., PAGANO I., PALLE E., PETER G., PIOTTO G., POLLACCO D., QUELOZ D., RAGAZZONI R., RANDO N., RAUER H., RIBAS I., RICKER G., SAHA S., SANTOS N.C., SCANDARIATO G., SEAGER S., SEGRANSAN D., SIMON A.E., SMITH A.M.S., SOUSA S.G., STALPORT M., SULIS S., SZABO G.M., UDRY S., ULMER-MOLL S., VAN GROOTEL V., VANDERSPEK R., VENTURINI J., VILLAVER E., VINES J.I., WALTON N.A., WEST R.G., WHEATLEY P.J., WINN J. and ZIVAVE T.

Abstract (from CDS):

Context. The TOI-178 system consists of a nearby, late-K-dwarf with six transiting planets in the super-Earth to mini-Neptune regime, with radii ranging from to 2.9 R⊕ and orbital periods between 1.9 and 20.7 days. All the planets, but the innermost one, form a chain of Laplace resonances. The fine-tuning and fragility of such orbital configurations ensure that no significant scattering or collision event has taken place since the formation and migration of the planets in the protoplanetary disc, thereby providing important anchors for planet formation models.
Aims. We aim to improve the characterisation of the architecture of this key system and, in particular, the masses and radii of its planets. In addition, since this system is one of the few resonant chains that can be characterised by both photometry and radial velocities, we propose to use it as a test bench for the robustness of the planetary mass determination with each technique.
Methods. We performed a global analysis of all the available photometry from CHEOPS, TESS and NGTS, and radial velocity from ESPRESSO, using a photo-dynamical modelling of the light curve. We also tried different sets of priors on the masses and eccentricity, as well as different stellar activity models, to study their effects on the masses estimated by transit-timing variations (TTVs) and radial velocities (RVs).
Results. We demonstrate how stellar activity prevents a robust mass estimation for the three outer planets using radial velocity data alone. We also show that our joint photo-dynamical and radial velocity analysis has resulted in a robust mass determination for planets c to Н`'', with precision of ∼ 12% for the mass of planet c, and better than 10% for planets d to Н`''. The new precisions on the radii range from 2 to 3%. The understanding of this synergy between photometric and radial velocity measurements will be valuable for the PLATO mission. We also show that TOI-178 is indeed currently locked in the resonant configuration, librating around an equilibrium of the chain.

Abstract Copyright: © The Authors 2024

Journal keyword(s): methods: data analysis - techniques: photometric - techniques: radial velocities - planets and satellites: detection - planets and satellites: gaseous planets

VizieR on-line data: <Available at CDS (J/A+A/688/A211): eulerd.dat samples.dat timings.dat cheopspr.dat cheopsd.dat ngtsd.dat tessd.dat ngtsr.dat>

Simbad objects: 16

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Number of rows : 16
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 TOI-178c Pl 00 29 12.3029193648 -30 27 13.466857032           ~ 29 0
2 TOI-178f Pl 00 29 12.3029193648 -30 27 13.466857032           ~ 15 0
3 WT 2353 PM* 00 29 12.3029193648 -30 27 13.466857032   13.05 11.95     ~ 102 0
4 TOI-178b Pl 00 29 12.3029193648 -30 27 13.466857032           ~ 29 0
5 TOI-178e Pl 00 29 12.3029193648 -30 27 13.466857032           ~ 13 0
6 TOI-178g Pl 00 29 12.3029193648 -30 27 13.466857032           ~ 17 0
7 TOI-178d Pl 00 29 12.3029193648 -30 27 13.466857032           ~ 20 0
8 HD 110067 PM* 12 39 21.5036859792 +20 01 40.035976644   9.22 8.43     K0V 54 0
9 BD+65 902 MS* 12 48 44.3726123832 +64 51 19.147528800   10.16 9.53     G5 50 0
10 Kepler-60 Er* 19 15 50.6983640712 +42 15 54.050260968   14.477 14.083 13.934   G2 132 1
11 Kepler-80 Er* 19 44 27.0200680656 +39 58 43.594100688   16.303 15.201 14.866   M0V 177 1
12 Kepler-223 Er* 19 53 16.4202435936 +47 16 46.308434088   16.209 15.570 15.78   ~ 192 1
13 BD-15 6290 BY* 22 53 16.7325836486 -14 15 49.304052185 12.928 11.749 10.192 9.013 7.462 M3.5V 1106 1
14 TRAPPIST-1 LM* 23 06 29.3684948589 -05 02 29.037301866     18.798 16.466 14.024 M7.5e 1306 0
15 K2-138f Pl 23 15 47.7686067840 -10 50 58.895461284           ~ 22 0
16 K2-138 * 23 15 47.7686067840 -10 50 58.895461284   13.01 12.21 12.12 11.40 ~ 75 0

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