2025A&A...704A.174L

Query : 2025A&A...704A.174L

2025A&A...704A.174L - Astronomy and Astrophysics, volume 704A174 (2025/12-1)

Improved characterization of the TOI-2141 system: A dense sub-Neptune with non-transiting inner and outer companions.

LUQUE R., LAM K.W.F., CABRERA J., BONFANTI A., ESCHEN Y., OLOFSSON G., BENZ W., BILLOT N., BRANDEKER A., CORREIA A.C.M., FOSSATI L., GANDOLFI D., OSBORN H.P., PEZZOTTI C., SOUSA S.G., WILSON T.G., WOLF S., ALIBERT Y., ALONSO R., ASQUIER J., BARCZY T., BARRADO D., BARROS S.C.C., BAUMJOHANN W., BIONDI F., BORSATO L., BROEG C., COLLIER CAMERON A., CSIZMADIA S., CUBILLOS P.E., DAVIES M.B., DELEUIL M., DELINE A., DEMANGEON O.D.S., DEMORY B.-O., DEREKAS A., EDWARDS B., EGGER J.A., EHRENREICH D., ERIKSON A., FORTIER A., FRIDLUND M., GAZEAS K., GILLON M., GUDEL M., GUNTHER M.N., HEITZMANN A., HELLING C., ISAAK K.G., KELLER T., KISS L.L., KORTH J., LASKAR J., LECAVELIER DES ETANGS A., LELEU A., LENDL M., MAGRIN D., MANTOVAN G., MAXTED P.F.L., MERIN B., MORDASINI C., NASCIMBENI V., OTTENSAMER R., PAGANO I., PALLE E., PETER G., PIAZZA D., PIOTTO G., POLLACCO D., QUELOZ D., RAGAZZONI R., RANDO N., RAUER H., RIBAS I., SANTOS N.C., SCANDARIATO G., SEGRANSAN D., SIMON A.E., SMITH A.M.S., STALPORT M., SULIS S., SZABO G.M., UDRY S., ULMER B., ULMER-MOLL S., VAN GROOTEL V., VENTURINI J., VILLAVER E., WALTON N.A. and WOLTER D.

Abstract (from CDS):

Aims. We aim to refine the fundamental parameters of the TOI-2141 planetary system, which includes a transiting sub-Neptune orbiting a Sun-like star on a relatively long orbit of 18.26 days, by combining new photometric and spectroscopic observations.
Methods. We analyzed new space-based photometry from TESS and CHEOPS, as well as 61 radial velocity measurements from HARPS-N. We performed individual and joint photometric and RV analyses using several modeling tools within a Bayesian model comparison framework.
Results. We refined the radius and mass of the transiting planet TOI-2141 b to 3.15 ± 0.04 R⊕ and 20.1 ± 1.6 M⊕ to levels that are five and two times more precise, respectively, than the previously reported values. Our radial velocity analysis reveals two additional non-transiting companions with orbital periods of 5.46 and 60.45 days. Despite the innermost planet's high geometric transit probability, we found no evidence of transits in the photometric data.
Conclusions. The bulk properties of TOI-2141 b suggest a significant volatile envelope atop an Earth-like core. The modeling indicates a hydrogen-rich atmosphere that could have experienced mild photoevaporation over the system's history. Planets b and c are believed to exhibit a modest mutual inclination of at least ∼2.4°.

Abstract Copyright: © The Authors 2025

Journal keyword(s): techniques: photometric - techniques: radial velocities - planets and satellites: detection - planets and satellites: individual: TOI-2141b - stars: solar-type

Simbad objects: 4

goto Full paper

goto View the references in ADS

Number of rows : 4
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 BD+18 3330 PM* 17 15 02.9060957472 +18 20 26.764729476   10.13 9.46     G5 11 0
2 BD+18 3330b Pl 17 15 02.9060957472 +18 20 26.764729476           ~ 4 0
3 TOI-2141c Pl 17 15 02.9060957472 +18 20 26.764729476           ~ 1 0
4 TOI-2141d Pl 17 15 02.9060957472 +18 20 26.764729476           ~ 1 0

To bookmark this query, right click on this link: simbad:objects in 2025A&A...704A.174L and select 'bookmark this link' or equivalent in the popup menu