2019AJ....157..245H

Query : 2019AJ....157..245H

2019AJ....157..245H - Astron. J., 157, 245-245 (2019/June-0)

A hot Saturn orbiting an oscillating late subgiant discovered by TESS.

HUBER D., CHAPLIN W.J., CHONTOS A., KJELDSEN H., CHRISTENSEN-DALSGAARD J., BEDDING T.R., BALL W., BRAHM R., ESPINOZA N., HENNING T., JORDAN A., SARKIS P., KNUDSTRUP E., ALBRECHT S., GRUNDAHL F., ANDERSEN M.F., PALLE P.L., CROSSFIELD I., FULTON B., HOWARD A.W., ISAACSON H.T., WEISS L.M., HANDBERG R., LUND M.N., SERENELLI A.M., MOSUMGAARD J.R., STOKHOLM A., BIERYLA A., BUCHHAVE L.A., LATHAM D.W., QUINN S.N., GAIDOS E., HIRANO T., RICKER G.R., VANDERSPEK R.K., SEAGER S., JENKINS J.M., WINN J.N., ANTIA H.M., APPOURCHAUX T., BASU S., BELL K.J., BENOMAR O., BONANNO A., BUZASI D.L., CAMPANTE T.L., CELIK ORHAN Z., CORSARO E., CUNHA M.S., DAVIES G.R., DEHEUVELS S., GRUNBLATT S.K., HASANZADEH A., DI MAURO M.P., GARCIA R.A., GAULME P., GIRARDI L., GUZIK J.A., HON M., JIANG C., KALLINGER T., KAWALER S.D., KUSZLEWICZ J.S., LEBRETON Y., LI T., LUCAS M., LUNDKVIST M.S., MANN A.W., MATHIS S., MATHUR S., MAZUMDAR A., METCALFE T.S., MIGLIO A., MONTEIRO M.J.P.F.G., MOSSER B., NOLL A., NSAMBA B., ONG J.M.J., ORTEL S., PEREIRA F., RANADIVE P., REGULO C., RODRIGUES T.S., ROXBURGH I.W., SILVA AGUIRRE V., SMALLEY B., SCHOFIELD M., SOUSA S.G., STASSUN K.G., STELLO D., TAYAR J., WHITE T.R., VERMA K., VRARD M., YILDIZ M., BAKER D., BAZOT M., BEICHMANN C., BERGMANN C., BUGNET L., CALE B., CARLINO R., CARTWRIGHT S.M., CHRISTIANSEN J.L., CIARDI D.R., CREEVEY O., DITTMANN J.A., DO NASCIMENTO J.-D.Jr, VAN EYLEN V., FURESZ G., GAGNE J., GAO P., GAZEAS K., GIDDENS F., HALL O.J., HEKKER S., IRELAND M.J., LATOUF N., LEBRUN D., LEVINE A.M., MATZKO W., NATINSKY E., PAGE E., PLAVCHAN P., MANSOURI-SAMANI M., McCAULIFF S., MULLALLY S.E., ORENSTEIN B., SOTO A.G., PAEGERT M., VAN SADERS J.L., SCHNAIBLE C., SODERBLOM D.R., SZABO R., TANNER A., TINNEY C.G., TESKE J., THOMAS A., TRAMPEDACH R., WRIGHT D., YUAN T.T. and ZOHRABI F.

Abstract (from CDS):

We present the discovery of HD 221416 b, the first transiting planet identified by the Transiting Exoplanet Survey Satellite (TESS) for which asteroseismology of the host star is possible. HD 221416 b (HIP 116158, TOI-197) is a bright (V = 8.2 mag), spectroscopically classified subgiant that oscillates with an average frequency of about 430 µHz and displays a clear signature of mixed modes. The oscillation amplitude confirms that the redder TESS bandpass compared to Kepler has a small effect on the oscillations, supporting the expected yield of thousands of solar-like oscillators with TESS 2 minute cadence observations. Asteroseismic modeling yields a robust determination of the host star radius (R* = 2.943 ± 0.064 R☉), mass (M* = 1.212 ± 0.074 M☉), and age (4.9 ± 1.1 Gyr), and demonstrates that it has just started ascending the red-giant branch. Combining asteroseismology with transit modeling and radial-velocity observations, we show that the planet is a "hot Saturn" (Rp = 9.17 ± 0.33 R⊕) with an orbital period of ∼14.3 days, irradiance of F = 343 ± 24 F⊕, and moderate mass (Mp = 60.5 ± 5.7 M⊕) and density (ρp = 0.431 ± 0.062 g cm–3). The properties of HD 221416 b show that the host-star metallicity-planet mass correlation found in sub-Saturns (4-8 R⊕) does not extend to larger radii, indicating that planets in the transition between sub-Saturns and Jupiters follow a relatively narrow range of densities. With a density measured to ∼15%, HD 221416 b is one of the best characterized Saturn-size planets to date, augmenting the small number of known transiting planets around evolved stars and demonstrating the power of TESS to characterize exoplanets and their host stars using asteroseismology.

Abstract Copyright: © 2019. The American Astronomical Society. All rights reserved.

Journal keyword(s): asteroseismology - techniques: photometric - planets and satellites: individual HD 221416 b - stars: fundamental parameters - planets and satellites: fundamental parameters

VizieR on-line data: <Available at CDS (J/AJ/157/245): table3.dat>

Simbad objects: 7

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Number of rows : 7
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 K2-97 RG* 08 31 03.0821917608 +10 50 51.309573576           K2III 40 0
2 K2-132 * 12 08 39.9336686136 -08 44 49.851703500   12.934 11.897     ~ 29 0
3 Kepler-91 RG* 19 02 41.4978337152 +44 07 00.239709792           K1IV 114 1
4 Kepler-432 RG* 19 33 07.7290058280 +48 17 09.147604308   13.485 12.464 12.203   G5 98 0
5 Kepler-56 RG* 19 35 02.0011980936 +41 52 18.692360400   13.954 12.756 12.379   ~ 210 1
6 HD 221416b Pl 23 32 08.0723503368 -21 48 05.114065284           ~ 20 0
7 HD 221416 PM* 23 32 08.0723503368 -21 48 05.114065284   9.03 8.15     K0IV/V 50 0

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