2020MNRAS.491.2834C

Query : 2020MNRAS.491.2834C

2020MNRAS.491.2834C - Mon. Not. R. Astron. Soc., 491, 2834-2844 (2020/January-2)

NGTS-8b and NGTS-9b: two non-inflated hot Jupiters.

COSTES J.C., WATSON C.A., BELARDI C., BRAKER I.P., BURLEIGH M.R., CASEWELL S.L., EIGMULLER P., GUNTHER M.N., JACKMAN J.A.G., NIELSEN L.D., SOTO M.G., TURNER O., ANDERSON D.R., BAYLISS D., BOUCHY F., BRIEGAL J.T., BRYANT E.M., CABRERA J., CHAUSHEV A., CSIZMADIA S., ERIKSON A., GILL S., GILLEN E., GOAD M.R., HODGKIN S., HOOTON M.J., JENKINS J.S., McCORMAC J., MOYANO M., QUELOZ D., RAUER H., RAYNARD L., SMITH A.M.S., THOMPSON A.P.G., TILBROOK R.H., UDRY S., VINES J.I., WEST R.G. and WHEATLEY P.J.

Abstract (from CDS):

We report the discovery, by the next generation transit survey (NGTS), of two hot Jupiters NGTS-8b and NGTS-9b. These orbit a V = 13.68 K0V star (Teff = 5241 ± 50 K) with a period of 2.49970 d, and a V = 12.80 F8V star (Teff = 6330 ± 130 K) in 4.43527 d, respectively. The transits were independently verified by follow-up photometric observations with the South African Astronomical Observatory 1.0-m and Euler telescopes, and we report on the planetary parameters using HARPS, FEROS, and CORALIE radial velocities. NGTS-8b has a mass, 0.93 ^{+0.04}_{-0.03} MJ and a radius, 1.09 ± 0.03 RJ similar to Jupiter, resulting in a density of 0.89 ^{+0.08}_{-0.07} g cm-3. This is in contrast to NGTS-9b, which has a mass of 2.90 ± 0.17 MJ and a radius of 1.07 ± 0.06 RJ, resulting in a much greater density of 2.93^{+0.53}_{-0.49} g cm-3. Statistically, the planetary parameters put both objects in the regime where they would be expected to exhibit larger than predicted radii. However, we find that their radii are in agreement with predictions by theoretical non-inflated models.

Abstract Copyright: © 2019 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society

Journal keyword(s): techniques: photometric - planets and satellites: detection - stars: individual: NGTS-8 and NGTS-9 - planetary systems

VizieR on-line data: <Available at CDS (J/MNRAS/491/2834): table1.dat table2.dat table4.dat-table11.dat>

Simbad objects: 15

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Number of rows : 15
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 NGTS-6b Pl 05 03 10.9028401320 -30 23 57.718858488           ~ 19 0
2 NGTS-1b Pl 05 30 51.4522649760 -36 37 50.895680268           ~ 60 0
3 NGTS-3Ab Pl 06 17 46.7534474544 -35 42 23.047980804           ~ 14 0
4 WASP-12 * 06 30 32.7966092352 +29 40 20.263502460   12.14 11.57     G0V 358 1
5 CD-38 3220b Pl 07 10 24.0604565856 -39 05 50.571250476           ~ 421 0
6 NGTS-9b Pl 09 27 40.9609498224 -19 20 51.559855800           ~ 8 0
7 NGTS-9 * 09 27 40.9609498224 -19 20 51.559855800   13.36 12.80 12.80   ~ 14 0
8 CD-30 11338b Pl 14 20 29.4891293064 -31 12 07.437166416           ~ 19 0
9 * alf Cen B PM* 14 39 35.06311 -60 50 15.0992 2.89 2.21 1.33     K1V 1092 2
10 CD-27 10695b Pl 15 59 50.9491505016 -28 03 42.312819096           ~ 313 1
11 HD 149026b Pl 16 30 29.6185771608 +38 20 50.308980864           ~ 388 1
12 Kepler-435b Pl 19 29 08.9490159624 +43 11 50.159878764           ~ 43 0
13 HD 189733b Pl 20 00 43.7129433648 +22 42 39.073143456           ~ 1610 1
14 NGTS-8b Pl 21 55 54.1982652672 -14 04 06.225474288           ~ 2 0
15 NGTS-8 * 21 55 54.1982652672 -14 04 06.225474288   14.58 13.72 13.53   ~ 5 0

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