2026ApJ...996L..13E

Query : 2026ApJ...996L..13E

2026ApJ...996L..13E - Astrophys. J., 996, L13 (2026/January-1)

A Cold and Superpuffy Planet on a Prograde Orbit.

ESPINOZA-RETAMAL J.I., BRAHM R., PETROVICH C., JORDAN A., HENNING T., TRIFONOV T., WINN J.N., REA E., GUNTHER M.N., AGABI A., BENDJOYA P., BHASKAR H., BOUCHY F., CATELAN M., CHARALAMBOUS C., DELOUPY V., DRANSFIELD G., EBERHARDT J., ESPINOZA N., FRECKELTON A.V., GUILLOT T., HOBSON M.J., JONES M.I., LENDL M., MEKARNIA D., MUNOZ D.J., NIELSEN D.L., ROJAS F.I., SCHMIDER F.-X., SEDAGHATI E., STEFANSSON G., STRIEGEL S., SUAREZ O., TALA PINTO M., TIMMERMANS M., TRIAUD A.H.M.J., UDRY S., ULMER-MOLL S. and ZIEGLER C.

Abstract (from CDS):

We report the discovery of TOI-4507 b, a transiting sub-Saturn with a density <0.2 g cm–3 on a 105 days prograde orbit around a 700 Myr old F star. The transits were detected using data from TESS as well as the Antarctic telescope ASTEP. A joint analysis of the light curves and radial velocities from HARPS, FEROS, and CORALIE confirmed the planetary nature of the signal, by limiting the mass to be below 20 M⊕ at 95% confidence. The radial velocities also exhibit the Rossiter-McLaughlin effect and imply that the planet orbits the star in a prograde orbit with a sky-projected obliquity $\lambda =-{15}_{-44}^{+50}$° (∣λ∣ < 80° at 3σ). With these characteristics, TOI-4507 is one of the longest-period systems for which the stellar obliquity has been measured, and the planet is among the longest-period and youngest “superpuff” planets yet discovered.

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

Journal keyword(s): Transit photometry - Exoplanets - Radial velocity - Cold Neptunes

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

Simbad objects: 16

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Number of rows : 16
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 CD-50 714b Pl 02 27 06.0975766704 -50 17 04.310799828           ~ 46 0
2 NAME V1298 Tau c Pl 04 05 19.5909996648 +20 09 25.563233736           ~ 64 0
3 OGLE LMC-CEP-1705 cC* 05 21 46.9162508976 -69 59 48.936779160   17.024 16.503   15.773 ~ 14 0
4 TOI-4507b Pl 05 21 48.2618182248 -69 59 17.644283916           ~ 1 0
5 HD 269434 * 05 21 48.2618182248 -69 59 17.644283916   11.52 10.81     G0 24 0
6 NAME TIC 241249530 b Pl? 06 21 14.1226982304 +53 17 42.316926612           ~ 13 0
7 BD+10 1799f Pl 08 26 27.8490900672 +10 04 49.334175156           ~ 50 0
8 BD+10 1799d Pl 08 26 27.8490900672 +10 04 49.334175156           ~ 27 0
9 HD 80606b Pl 09 22 37.5768032712 +50 36 13.435326684           ~ 369 1
10 BD+37 2118b Pl 10 47 31.0919176416 +36 19 45.855664428           ~ 13 0
11 BD+01 2494b Pl 10 52 07.7793551088 +00 29 36.081504852           ~ 26 0
12 WASP-193b Pl 10 57 23.8521672360 -29 59 49.665809724           ~ 8 0
13 WASP-39b Pl 14 29 18.4151689656 -03 26 40.204480380           ~ 345 1
14 HD 197481c Pl 20 45 09.5324974119 -31 20 27.237889841           ~ 82 0
15 BD-05 5432b Pl 21 00 06.1968214728 -05 05 40.034944176           ~ 219 1
16 WASP-21b Pl 23 09 58.2534443016 +18 23 45.885822792           ~ 71 1

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