2021MNRAS.502.3704A

Query : 2021MNRAS.502.3704A

2021MNRAS.502.3704A - Mon. Not. R. Astron. Soc., 502, 3704-3722 (2021/April-2)

TOI-257b (HD 19916b): a warm sub-saturn orbiting an evolved F-type star.

ADDISON B.C., WRIGHT D.J., NICHOLSON B.A., CALE B., MOCNIK T., HUBER D., PLAVCHAN P., WITTENMYER R.A., VANDERBURG A., CHAPLIN W.J., CHONTOS A., CLARK J.T., EASTMAN J.D., ZIEGLER C., BRAHM R., CARTER B.D., CLERTE M., ESPINOZA N., HORNER J., BENTLEY J., JORDAN A., KANE S.R., KIELKOPF J.F., LAYCHOCK E., MENGEL M.W., OKUMURA J., STASSUN K.G., BEDDING T.R., BOWLER B.P., BURNELIS A., BLANCO-CUARESMA S., COLLINS M., CROSSFIELD I., DAVIS A.B., EVENSBERGET D., HEITZMANN A., HOWELL S.B., LAW N., MANN A.W., MARSDEN S.C., MATSON R.A., O'CONNOR J.H., SHPORER A., STEVENS C., TINNEY C.G., TYLOR C., WANG S., ZHANG H., HENNING T., KOSSAKOWSKI D., RICKER G., SARKIS P., SCHLECKER M., TORRES P., VANDERSPEK R., LATHAM D.W., SEAGER S., WINN J.N., JENKINS J.M., MIRELES I., ROWDEN P., PEPPER J., DAYLAN T., SCHLIEDER J.E., COLLINS K.A., COLLINS K.I., TAN T.-G., BALL W.H., BASU S., BUZASI D.L., CAMPANTE T.L., CORSARO E., GONZALEZ-CUESTA L., DAVIES G.R., DE ALMEIDA L., DO NASCIMENTO J.-D., GARCIA R.A., GUO Z., HANDBERG R., HEKKER S., HEY D.R., KALLINGER T., KAWALER S.D., KAYHAN C., KUSZLEWICZ J.S., LUND M.N., LYTTLE A., MATHUR S., MIGLIO A., MOSSER B., NIELSEN M.B., SERENELLI A.M., SILVA AGUIRRE V. and THEMESSL N.

Abstract (from CDS):

We report the discovery of a warm sub-Saturn, TOI-257b (HD 19916b), based on data from NASA's Transiting Exoplanet Survey Satellite (TESS). The transit signal was detected by TESS and confirmed to be of planetary origin based on radial velocity observations. An analysis of the TESS photometry, the MINERVA-Australis, FEROS, and HARPS radial velocities, and the asteroseismic data of the stellar oscillations reveals that TOI-257b has a mass of MP = 0.138 ± 0.023 MJ (43.9 ± 7.3 M⊕), a radius of RP = 0.639 ± 0.013 RJ (7.16 ± 0.15 R⊕), bulk density of 0.65+0.12–0.11 (cgs), and period 18.38818+0.00085–0.00084 days. TOI-257b orbits a bright (V = 7.612 mag) somewhat evolved late F-type star with M* = 1.390 ± 0.046 Msun, R* = 1.888 ± 0.033 Rsun, Teff = 6075 ± 90 K, and vsin i = 11.3 ± 0.5 km s–1. Additionally, we find hints for a second non-transiting sub-Saturn mass planet on a ∼71 day orbit using the radial velocity data. This system joins the ranks of a small number of exoplanet host stars (∼100) that have been characterized with asteroseismology. Warm sub-Saturns are rare in the known sample of exoplanets, and thus the discovery of TOI-257b is important in the context of future work studying the formation and migration history of similar planetary systems.

Abstract Copyright: © 2020 The Author(s) Published by Oxford University Press on behalf of Royal Astronomical Society

Journal keyword(s): asteroseismology - techniques: photometric - techniques: radial velocities - techniques: spectroscopic - planetary systems - stars: individual: (TIC 200723869/TOI-257)

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 TOI-257c Pl 03 10 03.9822990984 -50 49 56.580324492           ~ 1 0
2 HD 19916b Pl 03 10 03.9822990984 -50 49 56.580324492           ~ 16 0
3 HD 19916 PM* 03 10 03.9822990984 -50 49 56.580324492   8.16 7.54     F8/G0V 56 0
4 * 51 Peg b Pl 22 57 27.9804852576 +20 46 07.797040104           ~ 744 1

To bookmark this query, right click on this link: simbad:objects in 2021MNRAS.502.3704A and select 'bookmark this link' or equivalent in the popup menu