TESS Reveals a Short-period Sub-Neptune Sibling (HD 86226c) to a Known Long-period Giant Planet

The Transiting Exoplanet Survey Satellite mission was designed to find transiting planets around bright, nearby stars. Here, we present the detection and mass measurement of a small, short-period (≈4 days) transiting planet around the bright (V = 7.9), solar-type star HD 86226 (TOI-652, TIC 22221375), previously known to host a long-period (~1600 days) giant planet. HD 86226c (TOI-652.01) has a radius of 2.16 ± 0.08 R ⊕ and a mass of ${7.25}_{-1.12}^{+1.19}$ M ⊕, based on archival and new radial velocity data. We also update the parameters of the longer-period, not-known-to-transit planet, and find it to be less eccentric and less massive than previously reported. The density of the transiting planet is 3.97 g cm−3, which is low enough to suggest that the planet has at least a small volatile envelope, but the mass fractions of rock, iron, and water are not well-constrained. Given the host star brightness, planet period, and location of the planet near both the "radius gap" and the "hot Neptune desert," HD 86226c is an interesting candidate for transmission spectroscopy to further refine its composition

Euskal jokoa eta jolasa : transmitiendo una herencia vasca a partir del juego

Resumen tomado de la publicaciónSe presenta el programa Gaztamendu que persigue dar a conocer a los jóvenes de los centros vascos la realidad actual de Euskadi e integrar a las nuevas generaciones en la vida activa de las casas centrales (euskal etxeak). Se divide en doce capítulos, cuyo objetivo es el de difundir la cultura vasca a través del juego. Se trata de dar a conocer el mundo cultural lúdico de los niños y jóvenes en el País Vasco. Está dirigido a todos aquellos miembros de las euskal etxeak que se muestran especialmente interesados en favorecer e impulsar la participación de los niños y los jóvenes en la dinámica de sus comunidades. Se intenta crear un puente de unión entre el País Vasco y el resto de comunidades vascas dispersas por el mundo para generar nuevas ideas que permitan aumentar el protagonismo de los jóvenes vascos. Se muestran juegos, bailes, música y el juego de pelota vasca, como elementos distintivos de la cultura de Euskadi, así como los herri kirolak, las traineras, las actividades de montaña o los juegos de fiestas infantiles. Se presentan sus reglas, sus características y sus formas de jugar. Su práctica permite reflexionar sobre lo que esas modalidades de jokoa y jolasa pueden ofrecer en las comunidades de fuera del País Vasco.MadridBiblioteca de Educación del Ministerio de Educación, Cultura y Deporte; Calle San Agustín 5 -3 Planta; 28014 Madrid; Tel. +34917748000; [email protected]

TESS Reveals a Short-period Sub-Neptune Sibling (HD 86226c) to a Known Long-period Giant Planet

The Transiting Exoplanet Survey Satellite mission was designed to find transiting planets around bright, nearby stars. Here we present the detection and mass measurement of a small, short-period ($\approx\,4$\,days) transiting planet around the bright ($V=7.9$), solar-type star HD 86226 (TOI-652, TIC 22221375), previously known to host a long-period ($\sim$1600 days) giant planet. HD 86226c (TOI-652.01) has a radius of $2.16\pm0.08$ $R_{\oplus}$ and a mass of 7.25$^{+1.19}_{-1.12}$ $M_{\oplus}$ based on archival and new radial velocity data. We also update the parameters of the longer-period, not-known-to-transit planet, and find it to be less eccentric and less massive than previously reported. The density of the transiting planet is $3.97$ g cm$^{-3}$, which is low enough to suggest that the planet has at least a small volatile envelope, but the mass fractions of rock, iron, and water are not well-constrained. Given the host star brightness, planet period, and location of the planet near both the ``radius gap'' and the ``hot Neptune desert'', HD 86226c is an interesting candidate for transmission spectroscopy to further refine its composition.Comment: Accepted in AJ on 22 June 202