2024A&A...684A.201B

Query : 2024A&A...684A.201B

2024A&A...684A.201B - Astronomy and Astrophysics, volume 684A201 (2024/4-1)

NGTS discovery of a highly inflated Saturn-mass planet and a highly irradiated hot Jupiter NGTS-26 b and NGTS-27 b.

BOUCHY F., GILLEN E., TURNER O., GILL S., NIELSEN L.D., LENDL M., VINES J.I., ALVES D.R., ANDERSON D.R., ARMSTRONG D.J., BAYLISS D., JENKINS J.S., ACTON J.S., BELARDI C., BRYANT E.M., BURLEIGH M.R., CASEWELL S.L., COSTES J.C., CHAUSHEV A., COOKE B.F., EIGMULLER P., ERIKSON A., GUNTHER M.N., GOAD M.R., GRIEVES N., McCORMAC J., MOYANO M., RAYNARD L., SMITH A.M.S., TILBROOK R.H., UDRY S., WATSON C.A., WEST R.G. and WHEATLEY P.J.

Abstract (from CDS):

We report the discovery of two new transiting giant exoplanets NGTS-26 b and NGTS-27 b by the Next Generation Transit Survey (NGTS). NGTS-26 b orbits around a G6-type main sequence star every 4.52 days. It has a mass of $0.29_{ - 0.06}^{ + 0.07}$MJup and a radius of $1.33_{ - 0.05}^{ + 0.06}$RJup making it a Saturn-mass planet with a highly inflated radius. NGTS-27 b orbits around a slightly evolved G3-type star every 3.37 days. It has a mass of $0.59_{ - 0.07}^{ + 0.10}$MJup and a radius of 1.40±0.04 RJup, making it a relatively standard hot Jupiter. The transits of these two planetary systems were re-observed and confirmed in photometry by the SAAO 1.0-m telescope, 1.2-m Euler Swiss telescope as well as the TESS spacecraft, and their masses were derived spectroscopically by the CORALIE, FEROS and HARPS spectrographs. Both giant exoplanets are highly irradiated by their host stars and present an anomalously inflated radius, especially NGTS-26 b which is one of the largest objects among peers of similar mass.

Abstract Copyright: © The Authors 2024

Journal keyword(s): techniques: photometric - planets and satellites: detection - planets and satellites: individual: NGTS-26 b - planets and satellites: individual: NGTS-27 b - planetary systems

VizieR on-line data: <Available at CDS (J/A+A/684/A201): table1.dat table3.dat>

Simbad objects: 19

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Number of rows : 19
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 HD 1397 PM* 00 17 47.1523790112 -66 21 32.062984452   8.56 7.78     G5III/IV 45 0
2 CD-24 102b Pl 00 20 38.5350433008 -23 56 08.602809216           ~ 39 1
3 NGTS-11b Pl 01 34 05.1360759912 -14 25 09.152486616           ~ 15 0
4 HAT-P-58b Pl? 04 35 23.1828078765 +56 52 05.584776453           ~ 8 0
5 NGTS-6b Pl 05 03 10.9028401320 -30 23 57.718858488           ~ 19 0
6 NGTS-1b Pl 05 30 51.4522649760 -36 37 50.895680268           ~ 60 0
7 NGTS-4b Pl 05 58 23.7549496011 -30 48 42.363268864           ~ 47 0
8 NGTS-10b Pl 06 07 29.337600 -25 35 41.67600           ~ 20 0
9 CD-38 2551b Pl 06 17 20.7484979472 -38 19 23.754062640           ~ 61 1
10 NGTS-13 * 11 44 57.6836869200 -38 08 22.963041924   13.419 12.704 12.635   ~ 10 0
11 NGTS-13b Pl 11 44 57.6836869200 -38 08 22.963041924           ~ 4 0
12 TOI-3218 * 13 44 06.3913885266 -32 31 22.733502847           ~ 4 0
13 NGTS-27b Pl 13 44 06.3913885266 -32 31 22.733502847           ~ 2 0
14 WASP-39b Pl 14 29 18.4151689656 -03 26 40.204480380           ~ 345 1
15 2MASS J14304401-3143566 * 14 30 44.0047926023 -31 43 56.696590133           ~ 1 0
16 NGTS-26b Pl 14 30 44.0047926023 -31 43 56.696590133           ~ 1 0
17 WASP-153b Pl 18 37 02.9816122296 +40 01 07.281954084           G0 24 0
18 NGTS-14B * 21 54 03.9205040376 -38 22 38.653484952           M3V 2 0
19 HD 221416 PM* 23 32 08.0723503368 -21 48 05.114065284   9.03 8.15     K0IV/V 50 0

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