000135745 001__ 135745
000135745 005__ 20260112133248.0
000135745 0247_ $$2doi$$a10.1051/0004-6361/202349133
000135745 0248_ $$2sideral$$a138761
000135745 037__ $$aART-2024-138761
000135745 041__ $$aeng
000135745 100__ $$aGoffo, E.
000135745 245__ $$aTOI-4438 b: a transiting mini-Neptune amenable to atmospheric characterization
000135745 260__ $$c2024
000135745 5060_ $$aAccess copy available to the general public$$fUnrestricted
000135745 5203_ $$aWe report the confirmation and mass determination of a mini-Neptune transiting the M3.5 V star TOI-4438 (G 182-34) every 7.44 days. A transit signal was detected with NASA’s TESS space mission in the sectors 40, 52, and 53. In order to validate the planet TOI-4438 b and to determine the system properties, we combined TESS data with high-precision radial velocity measurements from the CARMENES spectrograph, spanning almost one year, and ground-based transit photometry. We found that TOI-4438 b has a radius of Rb = 2.52 ± 0.13 R⊕ (5% precision), which together with a mass of Mb = 5.4 ± 1.1 M⊕ (20% precision), results in a bulk density of ρb = 1.85−0.44+0.51 g cm−3 (~28% precision), aligning the discovery with a volatile-rich planet. Our interior structure retrieval with a pure water envelope yields aminimum water mass fraction of 46% (1σ). TOI-4438 b is a volatile-rich mini-Neptune with likely H/He mixed with molecules, such as water, CO2, and CH4. The primary star has a J-band magnitude of 9.7, and the planet has a high transmission spectroscopy metric (TSM) of 136 ± 13. Taking into account the relatively warm equilibrium temperature of Teq = 435 ± 15 K, and the low activity level of its host star, TOI-4438 b is one of the most promising mini-Neptunes around an M dwarf for transmission spectroscopy studies.
000135745 536__ $$9info:eu-repo/grantAgreement/ES/AEI/CEX2020-001058-M$$9info:eu-repo/grantAgreement/ES/AEI/PID2019-109522GB-C5$$9info:eu-repo/grantAgreement/ES/AEI/PID2021-125627OB-C31$$9info:eu-repo/grantAgreement/ES/AEI/PID2022-137241NB-C4$$9info:eu-repo/grantAgreement/ES/MICINN/CEX2019-000920-S$$9info:eu-repo/grantAgreement/ES/MICINN/CEX2021-001131-S$$9info:eu-repo/grantAgreement/ES/MICINN/PID2020-117404GB-C21$$9info:eu-repo/grantAgreement/ES/MICINN PRE2020-095421
000135745 540__ $$9info:eu-repo/semantics/openAccess$$aby$$uhttps://creativecommons.org/licenses/by/4.0/deed.es
000135745 590__ $$a5.8$$b2024
000135745 592__ $$a1.968$$b2024
000135745 591__ $$aASTRONOMY & ASTROPHYSICS$$b16 / 84 = 0.19$$c2024$$dQ1$$eT1
000135745 593__ $$aSpace and Planetary Science$$c2024$$dQ1
000135745 593__ $$aAstronomy and Astrophysics$$c2024$$dQ1
000135745 594__ $$a8.9$$b2024
000135745 655_4 $$ainfo:eu-repo/semantics/article$$vinfo:eu-repo/semantics/publishedVersion
000135745 700__ $$aChaturvedi, P.
000135745 700__ $$aMurgas, F.
000135745 700__ $$aMorello, G.
000135745 700__ $$aOrell-Miquel, J.
000135745 700__ $$aAcuña, L.
000135745 700__ $$aPeña-Moñino, L.
000135745 700__ $$aPallé, E.
000135745 700__ $$aHatzes, A. P.
000135745 700__ $$aGeraldía-González, S.
000135745 700__ $$aPozuelos, F. J.
000135745 700__ $$aLanza, A. F.
000135745 700__ $$aGandolfi, D.
000135745 700__ $$aCaballero, J. A.
000135745 700__ $$aSchlecker, M.
000135745 700__ $$0(orcid)0000-0001-5654-0266$$aPérez-Torres, M.
000135745 700__ $$aLodieu, N.
000135745 700__ $$aSchweitzer, A.
000135745 700__ $$aHellier, C.
000135745 700__ $$aJeffers, S. V.
000135745 700__ $$aDuque-Arribas, C.
000135745 700__ $$aCifuentes, C.
000135745 700__ $$aBéjar, V. J. S.
000135745 700__ $$aDaspute, M.
000135745 700__ $$aDubois, F.
000135745 700__ $$aDufoer, S.
000135745 700__ $$aEsparza-Borges, E.
000135745 700__ $$aFukui, A.
000135745 700__ $$aHayashi, Y.
000135745 700__ $$aHerrero, E.
000135745 700__ $$aMori, M.
000135745 700__ $$aNarita, N.
000135745 700__ $$aParviainen, H.
000135745 700__ $$aTal-Or, L.
000135745 700__ $$aVanaverbeke, S.
000135745 700__ $$aHermelo, I.
000135745 700__ $$aAmado, P. J.
000135745 700__ $$aDreizler, S.
000135745 700__ $$aHenning, Th.
000135745 700__ $$aLillo-Box, J.
000135745 700__ $$aLuque, R.
000135745 700__ $$aMallorquín, M.
000135745 700__ $$aNagel, E.
000135745 700__ $$aQuirrenbach, A.
000135745 700__ $$aReffert, S.
000135745 700__ $$aReiners, A.
000135745 700__ $$aRibas, I.
000135745 700__ $$aSchöfer, P.
000135745 700__ $$aTabernero, H. M.
000135745 700__ $$aZechmeister, M.
000135745 773__ $$g685, A147 (2024), 20$$pAstron. astrophys.$$tAstronomy and Astrophysics$$x0004-6361
000135745 8564_ $$s9560611$$uhttps://zaguan.unizar.es/record/135745/files/texto_completo.pdf$$yVersión publicada
000135745 8564_ $$s3397846$$uhttps://zaguan.unizar.es/record/135745/files/texto_completo.jpg?subformat=icon$$xicon$$yVersión publicada
000135745 909CO $$ooai:zaguan.unizar.es:135745$$particulos$$pdriver
000135745 951__ $$a2026-01-12-12:53:23
000135745 980__ $$aARTICLE