2024MNRAS.533....1A

Query : 2024MNRAS.533....1A

2024MNRAS.533....1A - Mon. Not. R. Astron. Soc., 533, 1-26 (2024/September-1)

TOI-757 b: an eccentric transiting mini-Neptune on a 17.5-d orbit.

ALQASIM A., GRIEVES N., ROSARIO N.M., GANDOLFI D., LIVINGSTON J.H., SOUSA S., COLLINS K.A., TESKE J.K., FRIDLUND M., EGGER J.A., CABRERA J., HELLIER C., LANZA A.F., VAN EYLEN V., BOUCHY F., OELKERS R.J., SRDOC G., SHECTMAN S., GUNTHER M., GOFFO E., WILSON T., SERRANO L.M., BRANDEKER A., WANG S.X., HEITZMANN A., BONFANTI A., FOSSATI L., ALIBERT Y., DELREZ L., SEFAKO R., BARROS S., COLLINS K.I., DEMANGEON O.D.S., ALBRECHT S.H., ALONSO R., ASQUIER J., BARCZY T., BARRADO D., BAUMJOHANN W., BECK T., BENZ W., BILLOT N., BORSATO L., BROEG C., BRYANT E.M., BUTLER R.P., COCHRAN W.D., CAMERON A.C., CORREIA A.C.M., CRANE J.D., CSIZMADIA S., CUBILLOS P.E., DAVIES M.B., DAYLAN T., DELEUIL M., DELINE A., DEMORY B.-O., DEREKAS A., EDWARDS B., EHRENREICH D., ERIKSON A., ESSACK Z., FORTIER A., GAZEAS K., GILLON M., GUDEL M., HASIBA J., HATZES A.P., HELLING C., HIRANO T., HOWELL S.B., HOYER S., ISAAK K.G., JENKINS J.M., KANODIA S., KISS L.L., KORTH J., LAM K.W.F., LASKAR J., LECAVELIER DES ETANGS A., LENDL M., LUND M.B., LUQUE R., MANN A.W., MAGRIN D., MAXTED P.F.L., MORDASINI C., NARITA N., NASCIMBENI V., NOWAK G., OLOFSSON G., OSBORN H.P., OSBORNE H.L.M., OSIP D., OTTENSAMER R., PAGANO I., PALLE E., PETER G., PIOTTO G., POLLACCO D., QUELOZ D., RAGAZZONI R., RANDO N., RAUER H., REDFIELD S., RIBAS I., RICE M., RICKER G.R., RIEDER M., SALMON S., SANTOS N.C., SCANDARIATO G., SEAGER S., SEGRANSAN D., SHPORER A., SIMON A.E., SMITH A.M.S., STALPORT M., SZABO G.M., THOMPSON I., TWICKEN J.D., UDRY S., VANDERSPEK R., VAN GROOTEL V., VENTURINI J., VILLAVER E., VILLASENOR J., VIOTTO V., WALTER I., WALTON N.A., WINN J.N. and YEE S.W.

Abstract (from CDS):

We report the spectroscopic confirmation and fundamental properties of TOI$-$757 b, a mini$-$Neptune on a 17.5$-$d orbit transiting a bright star ($V\, =\, 9.7$ mag) discovered by the TESS mission. We acquired high$-$precision radial velocity measurements with the HARPS, ESPRESSO, and PFS spectrographs to confirm the planet detection and determine its mass. We also acquired space$-$borne transit photometry with the CHEOPS space telescope to place stronger constraints on the planet radius, supported with ground$-$based LCOGT photometry. WASP and KELT photometry were used to help constrain the stellar rotation period. We also determined the fundamental parameters of the host star. We find that TOI$-$757 b has a radius of $R_{\mathrm{p}} = 2.5 \pm 0.1 R_{\oplus }$ and a mass of $M_{\mathrm{p}} = 10.5^{+2.2}_{-2.1} M_{\oplus }$, implying a bulk density of $\rho _{\text{p}} = 3.6 \pm 0.8$ g cm$^{-3}$. Our internal composition modelling was unable to constrain the composition of TOI$-$757 b, highlighting the importance of atmospheric observations for the system. We also find the planet to be highly eccentric with e = 0.39$^{+0.08}_{-0.07}$, making it one of the very few highly eccentric planets among precisely characterized mini$-$Neptunes. Based on comparisons to other similar eccentric systems, we find a likely scenario for TOI$-$757 b's formation to be high eccentricity migration due to a distant outer companion. We additionally propose the possibility of a more intrinsic explanation for the high eccentricity due to star$-$star interactions during the earlier epoch of the Galactic disc formation, given the low metallicity and older age of TOI$-$757.

Abstract Copyright: © 2024 The Author(s). Published by Oxford University Press on behalf of Royal Astronomical Society.

Journal keyword(s): techniques: photometric - techniques: radial velocities - planets and satellites: composition - planets and satellites: interiors - stars: individual: TOI-757 (TIC 130924120)

VizieR on-line data: <Available at CDS (J/MNRAS/533/1): rv.dat photom.dat>

Simbad objects: 6

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Number of rows : 6
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-269b Pl 05 03 23.0610114456 -54 10 37.924879404           ~ 25 0
2 CD-34 8236 PM* 12 31 58.7013804600 -35 33 17.691260940   10.56 9.74     K1 11 0
3 CD-34 8236b Pl 12 31 58.7013804600 -35 33 17.691260940           ~ 3 0
4 BD-05 3763 PM* 13 47 23.4438244137 -06 08 12.729406281   11.30 10.28     K3.5V 73 0
5 BD-05 3763b Pl 13 47 23.4438244137 -06 08 12.729406281           ~ 22 0
6 K2-280b Pl 19 26 22.8813846576 -22 14 51.550486620           ~ 15 0

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