2024AJ....167..151H

Query : 2024AJ....167..151H

2024AJ....167..151H - Astron. J., 167, 151 (2024/April-0)

The TESS-Keck Survey. XIX. A Warm Transiting Sub-Saturn-mass Planet and a Nontransiting Saturn-mass Planet Orbiting a Solar Analog.

HILL M.L., KANE S.R., DALBA P.A., MacDOUGALL M., FETHEROLF T., LI Z., PIDHORODETSKA D., BATALHA N.M., CROSSFIELD I.J.M., DRESSING C., FULTON B., HOWARD A.W., HUBER D., ISAACSON H., PETIGURA E.A., ROBERTSON P., WEISS L.M., BEHMARD A., BEARD C., CHONTOS A., DAI F., GIACALONE S., HIRSCH L.A., HOLCOMB R., LUBIN J., MAYO A.W., MOCNIK T., MURPHY J.M.A., POLANSKI A.S., ROSENTHAL L.J., RUBENZAHL R.A., SCARSDALE N., TURTELBOOM E.V., VAN ZANDT J., BIERYLA A., CIARDI D.R., EASTMAN J.D., FALK B., HESSE K.M., LATHAM D.W., LIVINGSTON J., MATSON R.A., MATTHEWS E., RICKER G.R., RUDAT A., SCHLIEDER J.E., SEAGER S. and WINN J.N.

Abstract (from CDS):

The Transiting Exoplanet Survey Satellite (TESS) continues to increase dramatically the number of known transiting exoplanets, and is optimal for monitoring bright stars amenable to radial velocity (RV) and atmospheric follow-up observations. TOI-1386 is a solar-type (G5V) star that was detected via TESS photometry to exhibit transit signatures in three sectors with a period of 25.84 days. We conducted follow-up RV observations using Keck/High Resolution Echelle Spectrometer (HIRES) as part of the TESS-Keck Survey, collecting 64 RV measurements of TOI-1386 with the HIRES spectrograph over 2.5 yr. Our combined fit of the TOI-1386 photometry and RV data confirm the planetary nature of the detected TESS signal, and provide a mass and radius for planet b of 0.148 ± 0.019 MJ and 0.540 ± 0.017 RJ, respectively, marking TOI-1386 b as a warm sub-Saturn planet. Our RV data further reveal an additional outer companion, TOI-1386 c, with an estimated orbital period of 227.6 days and a minimum mass of 0.309 ± 0.038 MJ. The dynamical modeling of the system shows that the measured system architecture is long-term stable, although there may be substantial eccentricity oscillations of the inner planet due to the dynamical influence of the outer planet.

Abstract Copyright: © 2024. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Exoplanets - Exoplanet astronomy - Exoplanet detection methods - Radial velocity - Transit photometry - Photometry - Light curves - Spectral energy distribution - Spectroscopy

Simbad objects: 3

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Number of rows : 3
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-1386 MS* 22 18 00.8868538800 +54 19 08.400538236   11.34 10.61     G5V 15 0
2 TOI-1386b Pl 22 18 00.8868538800 +54 19 08.400538236           ~ 8 0
3 TOI-1386c Pl 22 18 00.8868538800 +54 19 08.400538236           ~ 2 0

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