2023A&A...674A.117G

Query : 2023A&A...674A.117G

2023A&A...674A.117G - Astronomy and Astrophysics, volume 674A117 (2023/6-1)

TOI-733 b: A planet in the small-planet radius valley orbiting a Sun-like star.

GEORGIEVA I.Y., PERSSON C.M., GOFFO E., ACUNA L., AGUICHINE A., SERRANO L.M., LAM K.W.F., GANDOLFI D., COLLINS K.A., HOWELL S.B., DAI F., FRIDLUND M., KORTH J., DELEUIL M., BARRAGAN O., COCHRAN W.D., CSIZMADIA S., DEEG H.J., GUENTHER E., HATZES A.P., JENKINS J.M., LIVINGSTON J., LUQUE R., MOUSIS O., OSBORNE H.L.M., PALLE E., REDFIELD S., VAN EYLEN V., TWICKEN J.D., WINN J.N., ALQASIM A., COLLINS K.I., GNILKA C.L., LATHAM D.W., LEWIS H.M., RELLES H.M., RICKER G.R., ROWDEN P., SEAGER S., SHPORER A., TAN T.-G., VANDERBURG A. and VANDERSPEK R.

Abstract (from CDS):

We report the discovery of a hot (Teq ≈ 1055 K) planet in the small-planet radius valley that transits the Sun-like star TOI-733. It was discovered as part of the KESPRINT follow-up program of TESS planets carried out with the HARPS spectrograph. TESS photometry from sectors 9 and 36 yields an orbital period of ${P_{{\rm{orb}}}} = 4.884765_{ - 2.4e - 5}^{ + 1.9e - 5}$ days and a radius of ${R_{\rm{p}}} = 1.992_{ - 0.090}^{ + 0.085}$R⊕. Multi-dimensional Gaussian process modelling of the radial velocity measurements from HARPS and activity indicators gives a semi-amplitude of K = 2.23 ± 0.26 m s–1, translating into a planet mass of ${M_{\rm{p}}} = 5.72_{ - 0.68}^{ + 0.70}$M⊕. These parameters imply that the planet is of moderate density (${\rho _{\rm{p}}} = 3.98_{ - 0.66}^{ + 0.77}$ g cm–3) and place it in the transition region between rocky and volatile-rich planets with H/He-dominated envelopes on the mass-radius diagram. Combining these with stellar parameters and abundances, we calculated planet interior and atmosphere models, which in turn suggest that TOI-733 b has a volatile-enriched, most likely secondary outer envelope, and may represent a highly irradiated ocean world. This is one of only a few such planets around G-type stars that are well characterised.

Abstract Copyright: © The Authors 2023

Journal keyword(s): planets and satellites: detection - planets and satellites: composition - planets and satellites: individual: TOI-733 - techniques: photometric - techniques: radial velocities

VizieR on-line data: <Available at CDS (J/A+A/674/A117): tablea1.dat>

Simbad objects: 8

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Number of rows : 8
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 PM J01276+7217 PM* 01 27 40.9728637224 +72 17 47.186355408     12.989 12.687   ~ 24 0
2 * pi. Men c Pl 05 37 09.8868446714 -80 28 08.834553264           ~ 117 0
3 2MASS J10373753-4053045 * 10 37 37.5190194848 -40 53 04.500586522           ~ 1 0
4 CD-40 6169 * 10 37 38.1987657696 -40 53 18.034931040   10.18 9.44 9.738   ~ 14 0
5 CD-40 6169b Pl 10 37 38.1987657696 -40 53 18.034931040           ~ 5 0
6 Gaia DR3 5392409372314670976 * 10 37 38.4821124157 -40 53 15.934791463           ~ 1 0
7 K2-3 PM* 11 29 20.3917077216 -01 27 17.281697868   13.52 12.17 11.88   M1V 99 0
8 Kepler-138 Er* 19 21 31.5679755816 +43 17 34.680970608   14.621 13.168 12.680   M1V 145 0

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