Discovery of two warm mini-Neptunes with contrasting densities orbiting the young K3V star TOI-815

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Psaridi, A.Université de Genève,University of Geneva (author)

Discovery of two warm mini-Neptunes with contrasting densities orbiting the young K3V star TOI-815

Article/chapterEnglish2024

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2024
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LIBRIS-ID:oai:research.chalmers.se:288ab240-79b9-427e-920f-00b4b75cf7a2
https://research.chalmers.se/publication/541140URI
https://doi.org/10.1051/0004-6361/202348678DOI

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Summary in:English

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We present the discovery and characterization of two warm mini-Neptunes transiting the K3V star TOI-815 in a K–M binary system. Analysis of its spectra and rotation period reveal the star to be young, with an age of 200+−400200 Myr. TOI-815b has a 11.2-day period and a radius of 2.94 ± 0.05 R+ with transits observed by TESS, CHEOPS, ASTEP, and LCOGT. The outer planet, TOI-815c, has a radius of 2.62 ± 0.10 R+, based on observations of three nonconsecutive transits with TESS; targeted CHEOPS photometry and radial velocity follow-up with ESPRESSO were required to confirm the 35-day period. ESPRESSO confirmed the planetary nature of both planets and measured masses of 7.6 ± 1.5 M+ (ρP = 1.64+−003331 g cm−3) and 23.5 ± 2.4 M+ (ρP = 7.2+−1110 g cm−3), respectively. Thus, the planets have very different masses, which is unusual for compact multi-planet systems. Moreover, our statistical analysis of mini-Neptunes orbiting FGK stars suggests that weakly irradiated planets tend to have higher bulk densities compared to those undergoing strong irradiation. This could be ascribed to their cooler atmospheres, which are more compressed and denser. Internal structure modeling of TOI-815b suggests it likely has a H-He atmosphere that constitutes a few percent of the total planet mass, or higher if the planet is assumed to have no water. In contrast, the measured mass and radius of TOI-815c can be explained without invoking any atmosphere, challenging planetary formation theories. Finally, we infer from our measurements that the star is viewed close to pole-on, which implies a spin-orbit misalignment at the 3σ level. This emphasizes the peculiarity of the system’s orbital architecture, and probably hints at an eventful dynamical history.

Subject headings and genre

NATURVETENSKAP Geovetenskap och miljövetenskap Meteorologi och atmosfärforskning hsv//swe
NATURAL SCIENCES Earth and Related Environmental Sciences Meteorology and Atmospheric Sciences hsv//eng
NATURVETENSKAP Fysik Astronomi, astrofysik och kosmologi hsv//swe
NATURAL SCIENCES Physical Sciences Astronomy, Astrophysics and Cosmology hsv//eng
techniques: radial velocities
techniques: photometric
planets and satellites: composition
stars: individual: TOI-815
planets and satellites: detection
planets and satellites: formation

Added entries (persons, corporate bodies, meetings, titles ...)

Osborn, H. P.Universität Bern,University of Bern (author)
Bouchy, F.Université de Genève,University of Geneva (author)
Lendl, M.Université de Genève,University of Geneva (author)
Parc, LénaUniversité de Genève,University of Geneva (author)
Billot, N.Université de Genève,University of Geneva (author)
Broeg, C.Universität Bern,University of Bern (author)
Sousa, S.G.Universidade do Porto,University of Porto (author)
Adibekyan, V.Universidade do Porto,University of Porto (author)
Attia, OmarUniversité de Genève,University of Geneva (author)
Bonfanti, A. (author)
Chakraborty, HritamUniversité de Genève,University of Geneva (author)
Collins, Karen A.Harvard-Smithsonian Center for Astrophysics (author)
Davoult, JeanneUniversität Bern,University of Bern (author)
Delgado Mena, E.Universidade do Porto,University of Porto (author)
Grieves, N.Université de Genève,University of Geneva (author)
Guillot, T.Observatoire de la Cote d'Azur (author)
Heitzmann, A.Université de Genève,University of Geneva (author)
Helled, R.Universität Zürich,University of Zürich (author)
Hellier, CoelKeele University (author)
Jenkins, Jon M.NASA Ames Research Center (author)
Knierim, HenrikUniversität Zürich,University of Zürich (author)
Krenn, A. (author)
Lissauer, Jack J.NASA Ames Research Center (author)
Luque, R.University of Chicago (author)
Rapetti, D.NASA Ames Research Center (author)
Santos, N. C.Universidade do Porto,University of Porto (author)
Suárez, OlgaObservatoire de la Cote d'Azur (author)
Venturini, J.Université de Genève,University of Geneva (author)
Wilkin, Francis P. (author)
Wilson, T.G.The University of Warwick (author)
Winn, J. N.Princeton University (author)
Ziegler, C.Stephen F. Austin State University (author)
Zingales, TizianoUniversità Degli Studi di Padova,University of Padua (author)
Alibert, Y.Universität Bern,University of Bern (author)
Brandeker, A.Stockholms universitet,Stockholm University (author)
Egger, J. A.Universität Bern,University of Bern (author)
Gandolfi, D.Universita degli Studi di Torino,University of Turin (author)
Hooton, M.J.University Of Cambridge (author)
Tuson, A.University Of Cambridge (author)
Ulmer-Moll, S.Université de Genève,University of Geneva (author)
Abe, L.Observatoire de la Cote d'Azur (author)
Allart, R.Université de Montréal (author)
Alonso, R.Instituto de Astrofísica de Canarias (author)
Anderson, D.The University of Warwick (author)
Escudé, G. A.Institut de Ciències de l'Espai (ICE) - CSIC,Institute of Space Sciences (ICE) - CSIC (author)
Bárczy, T. (author)
Barrado, D.Centro de Astrobiologia (CAB) (author)
Barros, S.C.C.Universidade do Porto,University of Porto (author)
Baumjohann, W. (author)
Beck, M.Université de Genève,University of Geneva (author)
Beck, T.Universität Bern,University of Bern (author)
Benz, W.Universität Bern,University of Bern (author)
Bonfils, X. (author)
Borsato, L.Istituto nazionale di astrofisica (INAF) (author)
Bourrier, V.Université de Genève,University of Geneva (author)
Ciardi, D. R.California Institute of Technology (Caltech) (author)
Collier Cameron, A.University of St Andrews (author)
Charnoz, S.Institut de Physique du Globe de Paris (author)
Cointepas, M.Université de Genève,University of Geneva (author)
Csizmadia, SzilardDeutsches Zentrums für Luft- und Raumfahrt (DLR),German Aerospace Center (DLR) (author)
Cubillos, P. E. (author)
Curto, G. LoEuropean Southern Observatory Santiago (author)
Davies, M. B.Lunds universitet,Lund University (author)
Daylan, TansuWashington University in St. Louis (author)
Deleuil, M.Laboratoire d'Astrophysique de Marseille (author)
Deline, A.Université de Genève,University of Geneva (author)
Delrez, L.Universite de Liège,University of Liège (author)
Demangeon, O.Universidade do Porto,University of Porto (author)
Demory, B.O.Universität Bern,University of Bern (author)
Dorn, C.Eidgenössische Technische Hochschule Zürich (ETH),Swiss Federal Institute of Technology in Zürich (ETH) (author)
Dumusque, X.Université de Genève,University of Geneva (author)
Ehrenreich, D.Université de Genève,University of Geneva (author)
Erikson, AndersDeutsches Zentrums für Luft- und Raumfahrt (DLR),German Aerospace Center (DLR) (author)
des Etangs, A. L.Institut d 'Astrophysique de Paris (author)
de Miguel, D.Airbus Group,Airbus Group Ltd (author)
Fortier, A.Universität Bern,University of Bern (author)
Fossati, L. (author)
Frensch, Yolanda G.C.Université de Genève,University of Geneva (author)
Fridlund, Malcolm,1952Chalmers tekniska högskola,Chalmers University of Technology,Universiteit Leiden (UL),Leiden University (UL)(Swepub:cth)malfri (author)
Gillon, MichaëlUniversite de Liège,University of Liège (author)
Gudel, M.Universität Wien,University of Vienna (author)
Günther, Maximilian N.European Space Research and Technology Centre (ESA ESTEC) (author)
Hagelberg, J.Université de Genève,University of Geneva (author)
Helling, Ch. (author)
Hoyer, S.Laboratoire d'Astrophysique de Marseille (author)
Isaak, K.European Space Research and Technology Centre (ESA ESTEC) (author)
Kiss, L. L.Magyar Tudomanyos Akademia,Hungarian Academy of Sciences (author)
Lam, K. W.F.Deutsches Zentrums für Luft- und Raumfahrt (DLR),German Aerospace Center (DLR) (author)
Laskar, J.Observatoire de Paris,Paris Observatory (author)
Lavie, B.Université de Genève,University of Geneva (author)
Lovis, C.Université de Genève,University of Geneva (author)
Magrin, D.Istituto nazionale di astrofisica (INAF) (author)
Marafatto, L.Istituto nazionale di astrofisica (INAF) (author)
Maxted, P.Keele University (author)
McDermott, S. (author)
Mékarnia, DjamelObservatoire de la Cote d'Azur (author)
Mordasini, C.Universität Bern,University of Bern (author)
Murgas, F.Universidad de la Laguna,University of La Laguna (author)
Nascimbeni, ValerioIstituto nazionale di astrofisica (INAF) (author)
Nielsen, L. D.European Southern Observatory (ESO) (author)
Olofsson, G.Stockholms universitet,Stockholm University (author)
Ottensamer, R.Universität Wien,University of Vienna (author)
Pagano, I.Istituto nazionale di astrofisica (INAF) (author)
Palle, EnricInstituto de Astrofísica de Canarias (author)
Peter, G.Deutsches Zentrums für Luft- und Raumfahrt (DLR),German Aerospace Center (DLR) (author)
Piotto, Giampaolo P.Università Degli Studi di Padova,University of Padua (author)
Pollacco, Don L.The University of Warwick (author)
Queloz, D.University Of Cambridge (author)
Ragazzoni, RobertoUniversità Degli Studi di Padova,University of Padua (author)
Ramos, Devin (author)
Rando, N.European Space Research and Technology Centre (ESA ESTEC) (author)
Rauer, H.Deutsches Zentrums für Luft- und Raumfahrt (DLR),German Aerospace Center (DLR) (author)
Reimers, C.Universität Wien,University of Vienna (author)
Ribas, I.Institut de Ciències de l'Espai (ICE) - CSIC,Institute of Space Sciences (ICE) - CSIC (author)
Seager, S.Massachusetts Institute of Technology (MIT) (author)
Segransan, D.Université de Genève,University of Geneva (author)
Scandariato, GaetanoIstituto nazionale di astrofisica (INAF) (author)
Simon, A.E.Universität Bern,University of Bern (author)
Smith, A. M.S.Deutsches Zentrums für Luft- und Raumfahrt (DLR),German Aerospace Center (DLR) (author)
Stalport, M.Universite de Liège,University of Liège (author)
Steller, Manfred B. (author)
Szabó, G.M.Eötvös Loránd University (ELTE) (author)
Thomas, NicolasUniversität Bern,University of Bern (author)
Pritchard, T.NASA Goddard Space Flight Center (author)
Udry, S.Université de Genève,University of Geneva (author)
Van Damme, C. CorralEuropean Space Research and Technology Centre (ESA ESTEC) (author)
Van Grootel, V.Universite de Liège,University of Liège (author)
Villaver, E.Instituto de Astrofísica de Canarias (author)
Walter, I.Deutsches Zentrums für Luft- und Raumfahrt (DLR),German Aerospace Center (DLR) (author)
Walton, N. A.University Of Cambridge (author)
Watkins, Cristilyn N.Harvard-Smithsonian Center for Astrophysics (author)
West, Richard GThe University of Warwick (author)
Université de GenèveUniversität Bern (creator_code:org_t)

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By the author/editor: Psaridi, A.; Osborn, H. P.; Bouchy, F.; Lendl, M.; Parc, Léna; Billot, N.; show more...; Broeg, C.; Sousa, S.G.; Adibekyan, V.; Attia, Omar; Bonfanti, A.; Chakraborty, Hri ...; Collins, Karen A ...; Davoult, Jeanne; Delgado Mena, E.; Grieves, N.; Guillot, T.; Heitzmann, A.; Helled, R.; Hellier, Coel; Jenkins, Jon M.; Knierim, Henrik; Krenn, A.; Lissauer, Jack J ...; Luque, R.; Rapetti, D.; Santos, N. C.; Suárez, Olga; Venturini, J.; Wilkin, Francis ...; Wilson, T.G.; Winn, J. N.; Ziegler, C.; Zingales, Tizian ...; Alibert, Y.; Brandeker, A.; Egger, J. A.; Gandolfi, D.; Hooton, M.J.; Tuson, A.; Ulmer-Moll, S.; Abe, L.; Allart, R.; Alonso, R.; Anderson, D.; Escudé, G. A.; Bárczy, T.; Barrado, D.; Barros, S.C.C.; Baumjohann, W.; Beck, M.; Beck, T.; Benz, W.; Bonfils, X.; Borsato, L.; Bourrier, V.; Ciardi, D. R.; Collier Cameron, ...; Charnoz, S.; Cointepas, M.; Csizmadia, Szila ...; Cubillos, P. E.; Curto, G. Lo; Davies, M. B.; Daylan, Tansu; Deleuil, M.; Deline, A.; Delrez, L.; Demangeon, O.; Demory, B.O.; Dorn, C.; Dumusque, X.; Ehrenreich, D.; Erikson, Anders; des Etangs, A. L ...; de Miguel, D.; Fortier, A.; Fossati, L.; Frensch, Yolanda ...; Fridlund, Malcol ...; Gillon, Michaël; Gudel, M.; Günther, Maximil ...; Hagelberg, J.; Helling, Ch.; Hoyer, S.; Isaak, K.; Kiss, L. L.; Lam, K. W.F.; Laskar, J.; Lavie, B.; Lovis, C.; Magrin, D.; Marafatto, L.; Maxted, P.; McDermott, S.; Mékarnia, Djamel; Mordasini, C.; Murgas, F.; Nascimbeni, Vale ...; Nielsen, L. D.; Olofsson, G.; Ottensamer, R.; Pagano, I.; Palle, Enric; Peter, G.; Piotto, Giampaol ...; Pollacco, Don L.; Queloz, D.; Ragazzoni, Rober ...; Ramos, Devin; Rando, N.; Rauer, H.; Reimers, C.; Ribas, I.; Seager, S.; Segransan, D.; Scandariato, Gae ...; Simon, A.E.; Smith, A. M.S.; Stalport, M.; Steller, Manfred ...; Szabó, G.M.; Thomas, Nicolas; Pritchard, T.; Udry, S.; Van Damme, C. Co ...; Van Grootel, V.; Villaver, E.; Walter, I.; Walton, N. A.; Watkins, Cristil ...; West, Richard G; show less...

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