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Discovery of two warm mini-Neptunes with contrasting densities orbiting the young K3V star TOI-815 by Psaridi, Angelica; Osborn, Hugh; Bouchy, François; Lendl, Monika; Parc, Léna; Billot, Nicolas; Broeg, Christopher; Sousa, Sérgio G.; Adibekyan, Vardan; Attia, Omar; Bonfanti, Andrea; Chakraborty, Hritam; Collins, Karen A.; Davoult, Jeanne; Delgado-Mena, Elisa; Grieves, Nolan; Guillot, Tristan; Heitzmann, Alexis; Helled, Ravit; Hellier, Coel; Jenkins, Jon M.; Knierim, Henrik; Krenn, Andreas; Lissauer, JackJ.; Luque, Rafael; Rapetti, David; Santos, Nuno C.; Suárez, Olga; Venturini, Julia; Wilkin, Francis P.; Wilson, Thomas G.; Winn, Joshua N.; Ziegler, Carl; Zingales, Tiziano; Alibert, Yann; Brandeker, Alexis; Egger, Jo Ann; Gandolfi, Davide; Hooton, Matthew J.; Tuson, Amy; Ulmer-Moll, Solène; Abe, Lyu; Allart, Romain; Alonso, Roi; Anderson, David R.; Anglada, Guillem; Bárczy, Tamas; Barrado, David; Barros, Susana C. C.; Baumjohann, Wolfgang; Beck, Mathias; Beck, Thomas; Benz, Willy; Bonfils, Xavier; Borsato, Luca; Bourrier, Vincent; Ciardi, David R.; Cameron, Andrew Collier; Charnoz, Sébastien; Cointepas, Marion; Csizmadia, Szilárd; Cubillos, Patricio; Curto, Gaspare Lo; Davies, Melvyn B.; Daylan, Tansu; Deleuil, Magali; Deline, Adrien; Delrez, Laetitia; Demangeon, Olivier D. S.; Demory, Brice-Olivier; Dorn, Caroline; Dumusque, Xavier; Ehrenreich, David; Erikson, Anders; Etangs, Alain Lecavelier des; Ferreras, Elena Diana de Miguel; Fortier, Andrea; Fossati, Luca; Frensch, Yolanda G. C.; Fridlund, Malcolm; Gillon, Michaël; Güdel, Manuel; Günther, Maximilian N.; Hagelberg, Janis; Helling, Christiane; Hoyer, Sergio; Isaak, Kate G.; Kiss, Laszlo L.; Lam, Kristine; Laskar, Jacques; Lavie, Baptiste; Lovis, Christophe; Magrin, Demetrio; Marafatto, Luca; Maxted, Pierre; McDermott, Scott; Mékarnia, Djamel; Mordasini, Christoph; Murgas, Felipe; Nascimbeni, Valerio; Nielsen, Louise D.; Olofsson, Göran; Ottensamer, Roland; Pagano, Isabella; Pallé, Enric; Peter, Gisbert; Piotto, Giampaolo; Pollacco, Don; Queloz, Didier; Ragazzoni, Roberto; Ramos, Devin; Rando, Nicola; Rauer, Heike; Reimers, Christian; Ribas, Ignasi; Seager, Sara; Ségransan, Damien; Scandariato, Gaetano; Simon, Attila; Smith, Alexis M. S.; Stalport, Manu; Steller, Manfred; Szabó, Gyula; Thomas, Nicolas; Pritchard, Tyler A.; Udry, Stéphane; Van Damme, Carlos Corral; Van Grootel, Valérie; Villaver, Eva; Walter, Ingo; Walton, Nicholas; Watkins, Cristilyn N.; West, Richard G. is a scholarly article available to read on EtoBox.

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

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 the spectra and rotation period reveal it to be a young star with an age of $200^{+400}_{-200}$Myr. TOI-815b has a 11.2-day period and a radius of 2.94$\pm$0.05$\it{R_{\rm\mathrm{\oplus}}}$ with transits observed by TESS, CHEOPS, ASTEP, and LCOGT. The outer planet, TOI-815c, has a radius of 2.62$\pm$0.10$\it{R_{\rm\mathrm{\oplus}}}$, based on observations of three non-consecutive transits with TESS, while targeted CHEOPS photometry and radial velocity follow-up with ESPRESSO were required to confirm the 35-day period. ESPRESSO confirmed the planetary nature of both planets and measured masses of 7.6$\pm$1.5 $\it{M_{\rm \mathrm{\oplus}}}$ ($\rho_\mathrm{P}$=1.64$^{+0.33}_{-0.31}$gcm$^{-3}$) and 23.5$\pm$2.4$\it{M_{\rm\mathrm{\oplus}}}$ ($\rho_\mathrm{P}$=7.2$^{+1.1}_{-1.0}$gcm$^{-3}$) respectively. Thus, the planets have very different masses, unlike the usual similarity of masses in compact multi-planet systems. Moreover, our statistical analysis of mini-Neptunes orbiting FGK stars suggests that weakly irradiated planets tend to have higher bul

Author
Psaridi, Angelica; Osborn, Hugh; Bouchy, François; Lendl, Monika; Parc, Léna; Billot, Nicolas; Broeg, Christopher; Sousa, Sérgio G.; Adibekyan, Vardan; Attia, Omar; Bonfanti, Andrea; Chakraborty, Hritam; Collins, Karen A.; Davoult, Jeanne; Delgado-Mena, Elisa; Grieves, Nolan; Guillot, Tristan; Heitzmann, Alexis; Helled, Ravit; Hellier, Coel; Jenkins, Jon M.; Knierim, Henrik; Krenn, Andreas; Lissauer, JackJ.; Luque, Rafael; Rapetti, David; Santos, Nuno C.; Suárez, Olga; Venturini, Julia; Wilkin, Francis P.; Wilson, Thomas G.; Winn, Joshua N.; Ziegler, Carl; Zingales, Tiziano; Alibert, Yann; Brandeker, Alexis; Egger, Jo Ann; Gandolfi, Davide; Hooton, Matthew J.; Tuson, Amy; Ulmer-Moll, Solène; Abe, Lyu; Allart, Romain; Alonso, Roi; Anderson, David R.; Anglada, Guillem; Bárczy, Tamas; Barrado, David; Barros, Susana C. C.; Baumjohann, Wolfgang; Beck, Mathias; Beck, Thomas; Benz, Willy; Bonfils, Xavier; Borsato, Luca; Bourrier, Vincent; Ciardi, David R.; Cameron, Andrew Collier; Charnoz, Sébastien; Cointepas, Marion; Csizmadia, Szilárd; Cubillos, Patricio; Curto, Gaspare Lo; Davies, Melvyn B.; Daylan, Tansu; Deleuil, Magali; Deline, Adrien; Delrez, Laetitia; Demangeon, Olivier D. S.; Demory, Brice-Olivier; Dorn, Caroline; Dumusque, Xavier; Ehrenreich, David; Erikson, Anders; Etangs, Alain Lecavelier des; Ferreras, Elena Diana de Miguel; Fortier, Andrea; Fossati, Luca; Frensch, Yolanda G. C.; Fridlund, Malcolm; Gillon, Michaël; Güdel, Manuel; Günther, Maximilian N.; Hagelberg, Janis; Helling, Christiane; Hoyer, Sergio; Isaak, Kate G.; Kiss, Laszlo L.; Lam, Kristine; Laskar, Jacques; Lavie, Baptiste; Lovis, Christophe; Magrin, Demetrio; Marafatto, Luca; Maxted, Pierre; McDermott, Scott; Mékarnia, Djamel; Mordasini, Christoph; Murgas, Felipe; Nascimbeni, Valerio; Nielsen, Louise D.; Olofsson, Göran; Ottensamer, Roland; Pagano, Isabella; Pallé, Enric; Peter, Gisbert; Piotto, Giampaolo; Pollacco, Don; Queloz, Didier; Ragazzoni, Roberto; Ramos, Devin; Rando, Nicola; Rauer, Heike; Reimers, Christian; Ribas, Ignasi; Seager, Sara; Ségransan, Damien; Scandariato, Gaetano; Simon, Attila; Smith, Alexis M. S.; Stalport, Manu; Steller, Manfred; Szabó, Gyula; Thomas, Nicolas; Pritchard, Tyler A.; Udry, Stéphane; Van Damme, Carlos Corral; Van Grootel, Valérie; Villaver, Eva; Walter, Ingo; Walton, Nicholas; Watkins, Cristilyn N.; West, Richard G.
Published
2024
Language
EN

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