2024ApJ...971L..28K

Query : 2024ApJ...971L..28K

2024ApJ...971L..28K - Astrophys. J., 971, L28 (2024/August-3)

TOI-1408: Discovery and Photodynamical Modeling of a Small Inner Companion to a Hot Jupiter Revealed by Transit Timing Variations.

KORTH J., CHATURVEDI P., PARVIAINEN H., CARLEO I., ENDL M., GUENTHER E.W., NOWAK G., PERSSON C.M., MacQUEEN P.J., MUSTILL A.J., CABRERA J., COCHRAN W.D., LILLO-BOX J., HOBBS D., MURGAS F., GREKLEK-MCKEON M., KELLERMANN H., HEBRARD G., FUKUI A., PALLE E., JENKINS J.M., TWICKEN J.D., COLLINS K.A., QUINN S.N., SUBJAK J., BECK P.G., GANDOLFI D., MATHUR S., DEEG H.J., LATHAM D.W., ALBRECHT S., BARRADO D., BOISSE I., BOUY H., DELFOSSE X., DEMANGEON O., GARCIA R.A., HATZES A.P., HEIDARI N., IKUTA K., KABATH P., KNUTSON H.A., LIVINGSTON J., MARTIOLI E., MORALES-CALDERON M., MORELLO G., NARITA N., ORELL-MIQUEL J., OSBORNE H.L.M., PALAKKATHARAPPIL D.B., PINTER V., REDFIELD S., RELLES H.M., SCHWARZ R.P., SEAGER S., SHPORER A., SKARKA M., SRDOC G., STANGRET M., THOMAS L., VAN EYLEN V., WATANABE N. and WINN J.N.

Abstract (from CDS):

We report the discovery and characterization of a small planet, TOI-1408 c, on a 2.2 day orbit located interior to a previously known hot Jupiter, TOI-1408 b (P = 4.42 days, M = 1.86 ± 0.02 MJup, R = 2.4 ± 0.5 RJup) that exhibits grazing transits. The two planets are near 2:1 period commensurability, resulting in significant transit timing variations (TTVs) for both planets and transit duration variations for the inner planet. The TTV amplitude for TOI-1408 c is 15% of the planet's orbital period, marking the largest TTV amplitude relative to the orbital period measured to date. Photodynamical modeling of ground-based radial velocity (RV) observations and transit light curves obtained with the Transiting Exoplanet Survey Satellite and ground-based facilities leads to an inner planet radius of 2.22 ± 0.06 R⊕ and mass of 7.6 ± 0.2 M⊕ that locates the planet into the sub-Neptune regime. The proximity to the 2:1 period commensurability leads to the libration of the resonant argument of the inner planet. The RV measurements support the existence of a third body with an orbital period of several thousand days. This discovery places the system among the rare systems featuring a hot Jupiter accompanied by an inner low-mass planet.

Abstract Copyright: © 2024. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Exoplanet dynamics - Hot Jupiters - Hot Neptunes - Transit timing variation method - Transit photometry - Radial velocity

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

Simbad objects: 13

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Number of rows : 13
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 TOI-2202 * 03 24 54.8617645405 -73 57 27.263237472   13.902 12.988 12.818   ~ 25 0
2 WASP-126 PM* 04 13 29.7451475424 -69 13 36.561615996   11.904 11.203     G2 50 0
3 BD+02 2056 Em* 08 44 25.7031511896 +01 51 36.105474888   11.64 10.83     K1 58 0
4 CPD-66 1066 PM* 09 45 35.4863017320 -66 41 12.065943444   11.81 10.98     ~ 31 0
5 WASP-132 PM* 14 30 26.1896583264 -46 09 33.123352608   13.147   11.758   K4V 55 0
6 Kepler-730 Ro* 19 02 13.1572147800 +45 34 43.854430296           ~ 74 0
7 TOI-1130 * 19 05 30.2235431880 -41 26 15.077969016   12.42 11.59     ~ 60 0
8 Kepler-88 Er* 19 24 35.5430965488 +40 40 09.809893020   14.192 13.257 13.084   G8IV 101 1
9 BD+72 969c Pl 20 54 02.6103662208 +72 34 49.878396228           ~ 6 0
10 BD+72 969b Pl 20 54 02.6103662208 +72 34 49.878396228           ~ 7 0
11 BD+72 969 * 20 54 02.6103662208 +72 34 49.878396228   9.84 9.27     F8V 19 0
12 WASP-47 * 22 04 48.7261549272 -12 01 07.998743676     11.99 11.82   ~ 217 1
13 * 51 Peg b Pl 22 57 27.9804852576 +20 46 07.797040104           ~ 744 1

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