2025MNRAS.536.2011V

Query : 2025MNRAS.536.2011V

2025MNRAS.536.2011V - Mon. Not. R. Astron. Soc., 536, 2011-2024 (2025/January-3)

NGTS-31b and NGTS-32b: two inflated hot jupiters orbiting subgiant stars.

VINES J.I., JENKINS J.S., ANDERSON D.R., ALVES D.R., MOYANO M., ACTON J.S., APERGIS I., BARKAOUI K., BAYLISS D., BOUCHY F., BRYANT E.M., BURLEIGH M.R., CASEWELL S.L., CHRISTIANSEN J.L., COLLINS K.A., EIGMULLER P., FALK B., GILL S., GILLEN E., GOAD M.R., GUNTHER M.N., HENDERSON B.A., KENDALL A., LENDL M., McCORMAC J., NIELSEN L.D., OSBORN A., RAMSAY G., RICKER G.R., ROWDEN P., RUDAT A., SAHA S., SEAGER S., SMITH A.M.S., TAN T.-G., TILBROOK R.H., UDRY S., WEST R., WHEATLEY P.J., WINN J.N. and ZIVAVE T.

Abstract (from CDS):

We present the discoveries of NGTS-31b(= TOI-2721), and NGTS-32b, two hot Jupiters from the Next Generation Transit Survey (NGTS) transiting slightly evolved stars. The orbital periods, radii, and masses are 4.16 and 3.31 d, 1.61 and 1.42 $R_{J}$, and 1.12 and 0.57 $M_{J}$, respectively. Both planets have an incident stellar flux significantly above the threshold where inflation occurs, with both planets showing signs of inflation. These planets have widely different equilibrium temperatures than other hot Jupiters of similar mass and radius, with NGTS-31b having a significantly lower temperature, and NGTS-32b being hotter. This dichotomy raises the question of how prevalent the roles of other inflation mechanisms are in the radius anomaly phenomena and will help further constrain different inflationary models.

Abstract Copyright: © 2024 The Author(s). Published by Oxford University Press on behalf of Royal Astronomical Society.

Journal keyword(s): techniques: photometric - planetary systems

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 * bet Hyi PM* 00 25 45.07036 -77 15 15.2860 3.52 3.41 2.79 2.28 1.94 G0V 631 0
2 NGTS-31 * 05 21 41.1055361960 -38 39 24.488044927   14.118 13.439 13.432   ~ 3 0
3 NGTS-31b Pl 05 21 41.1055361960 -38 39 24.488044927           ~ 2 0
4 HD 81809A PM* 09 27 46.784477 -06 04 16.37015   6.20 5.56     ~ 15 0
5 NGTS-32 * 14 55 25.8524658936 -18 25 56.316435729           ~ 1 0
6 NGTS-32b Pl 14 55 25.8524658936 -18 25 56.316435729           ~ 1 0

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