2020MNRAS.498.4503F

Query : 2020MNRAS.498.4503F

2020MNRAS.498.4503F - Mon. Not. R. Astron. Soc., 498, 4503-4517 (2020/November-1)

The TOI-763 system: sub-Neptunes orbiting a Sun-like star.

FRIDLUND M., LIVINGSTON J., GANDOLFI D., PERSSON C.M., LAM K.W.F., STASSUN K.G., HELLIER C., KORTH J., HATZES A.P., MALAVOLTA L., LUQUE R., REDFIELD S., GUENTHER E.W., ALBRECHT S., BARRAGAN O., BENATTI S., BOUMA L., CABRERA J., COCHRAN W.D., CSIZMADIA S., DAI F., DEEG H.J., ESPOSITO M., GEORGIEVA I., GRZIWA S., GONZALEZ CUESTA L., HIRANO T., JENKINS J.M., KABATH P., KNUDSTRUP E., LATHAM D.W., MATHUR S., MULLALLY S.E., NARITA N., NOWAK G., OLOFSSON A.O.H., PALLE E., PATZOLD M., POMPEI E., RAUER H., RICKER G., RODLER F., SEAGER S., SERRANO L.M., SMITH A.M.S., SPINA L., SUBJAK J., TENENBAUM P., TING E.B., VANDERBURG A., VANDERSPEK R., VAN EYLEN V., VILLANUEVA S. and WINN J.N.

Abstract (from CDS):

We report the discovery of a planetary system orbiting TOI-763(aka CD-39 7945), a V = 10.2, high proper motion G-type dwarf star that was photometrically monitored by the TESS space mission in Sector 10. We obtain and model the stellar spectrum and find an object slightly smaller than the Sun, and somewhat older, but with a similar metallicity. Two planet candidates were found in the light curve to be transiting the star. Combining TESS transit photometry with HARPS high-precision radial velocity (RV) follow-up measurements confirm the planetary nature of these transit signals. We determine masses, radii, and bulk densities of these two planets. A third planet candidate was discovered serendipitously in the RV data. The inner transiting planet, TOI-763 b, has an orbital period of Pb = 5.6 d, a mass of Mb = 9.8 ± 0.8 M⊕, and a radius of Rb = 2.37 ± 0.10 R⊕. The second transiting planet, TOI-763 c, has an orbital period of Pc = 12.3 d, a mass of Mc = 9.3 ± 1.0 M⊕, and a radius of Rc = 2.87 ± 0.11 R⊕. We find the outermost planet candidate to orbit the star with a period of ∼48 d. If confirmed as a planet, it would have a minimum mass of Md = 9.5 ± 1.6 M⊕. We investigated the TESS light curve in order to search for a mono transit by planet d without success. We discuss the importance and implications of this planetary system in terms of the geometrical arrangements of planets orbiting G-type stars.

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

Journal keyword(s): planets and satellites: detection - planets and satellites: individual: TOI-763 - planets and satellites: individual: TIC 178819686

Status at CDS : Large table(s) will be appraised for possible ingestion in VizieR.

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 NGC 4832 GiG 12 57 47.5125966696 -39 45 42.114116844   13.17   11.53   ~ 40 0
2 CD-39 7945b Pl 12 57 52.4466594744 -39 45 27.707568552           ~ 10 0
3 CD-39 7945c Pl 12 57 52.4466594744 -39 45 27.707568552           ~ 9 0
4 CD-39 7945 PM* 12 57 52.4466594744 -39 45 27.707568552   10.85 10.28 10.14   ~ 19 0
5 CD-39 7945d Pl 12 57 52.4466594744 -39 45 27.707568552           ~ 1 0
6 Kepler-396c Pl 19 44 31.8711622728 +48 58 38.563365252           ~ 41 0

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