2025AJ....170...41E

Query : 2025AJ....170...41E

2025AJ....170...41E - Astron. J., 170, 41 (2025/July-0)

Giant Outer Transiting Exoplanet Mass (GOT 'EM) Survey. VI. Confirmation of a Long-period Giant Planet Discovered with a Single TESS Transit.

ESSACK Z., DRAGOMIR D., DALBA P.A., BATTLEY M.P., CIARDI D.R., COLLINS K.A., HOWELL S.B., JONES M.I., KANE S.R., MAMAJEK E.E., MANN C.R., MIRELES I., ODDO D., SGRO L.A., STASSUN K.G., ULMER-MOLL S., WATKINS C.N., YEE S.W., ZIEGLER C., BIERYLA A., APERGIS I., BARKAOUI K., BRAHM R., BRYANT E.M., ESPOSITO T.M., FIGUEIRA P., FULTON B.J., GILL S., HOWARD A.W., ISAACSON H., KENDALL A., LAW N., LUND M.B., MANN A.W., MATSON R.A., MURGAS F., PALLE E., QUINN S.N., REVOL A., SAHA S., SCHWARZ R.P., SEFAKO R., SHPORER A., STRAKHOV I.A., VILLANUEVA S.Jr, RICKER G.R., VANDERSPEK R., LATHAM D.W., SEAGER S., WINN J.N., BOSCH-CABOT P., COLLINS K.I., FORES-TORIBIO R., FRUSTAGIA F.R., GIRARDIN E., HELM I.J., LEWIN P., MUNOZ J.A., NEWMAN P., PLAVCHAN P., SRDOC G., STOCKDALE C., WUNSCHE A., BILLIANI M., DAVY M., DOUVAS A., FUKUI K., GUILLET B., OSTREM C., RUSHTON M., SCHMIDT A., FINARDI A., GIRARD P., GOTO T., DE LAMBILLY J.S., LEROUX L., MORTECRETTE F., PICKERING J.W., PRIMM M., RIBOT M., TENG E., VERVEEN A., WILL S. and ZIEGLER M.

Abstract (from CDS):

We report the discovery and confirmation of TOI-4465 b, a 1.25RJ${}_{-0.07{R}_{{\rm{J}}}}^{+0.08{R}_{{\rm{J}}}}$, 5.89MJ ± 0.26MJ giant planet orbiting a G dwarf star at d ≃ 122 pc. The planet was detected as a single-transit event in data from Sector 40 of the Transiting Exoplanet Survey Satellite (TESS) mission. Radial velocity (RV) observations of TOI-4465 showed a planetary signal with an orbital period of ∼102 days and an orbital eccentricity of e = 0.24 ± 0.01. TESS reobserved TOI-4465 in Sector 53 and Sector 80 but did not detect another transit of TOI-4465 b, as the planet was not expected to transit during these observations based on the RV period. A global ground-based photometry campaign was initiated to observe another transit of TOI-4465 b after the RV period determination. The ∼12 hr long transit event was captured from multiple sites around the world and included observations from 24 citizen scientists, confirming the orbital period as ∼102 days. TOI-4465 b is a relatively dense (3.73 ± 0.53 g cm–3), temperate (375-478 K) giant planet. Based on giant planet structure models, TOI-4465 b appears to be enriched in heavy elements at a level consistent with late-stage accretion of icy planetesimals. Additionally, we explore TOI-4465 b's potential for atmospheric characterization and obliquity measurement. Increasing the number of long-period planets by confirming single-transit events is crucial for understanding the frequency and demographics of planet populations in the outer regions of planetary systems.

Abstract Copyright: © 2025. The Author(s). Published by the American Astronomical Society.

Journal keyword(s): Exoplanets - Radial velocity - Transit photometry - Planetary system formation

Simbad objects: 4

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Number of rows : 4
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 NAME TIC 241249530 b Pl? 06 21 14.1226982304 +53 17 42.316926612           ~ 13 0
2 HD 80606b Pl 09 22 37.5768032712 +50 36 13.435326684           ~ 369 1
3 BD+15 3457b Pl 18 24 32.2258054272 +15 50 30.110550072           ~ 1 0
4 BD+15 3457 Em* 18 24 32.2258054272 +15 50 30.110550072   11.28 10.43     F9 3 0

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