Revisiting the common envelope evolution in binary stars: a new semianalytic model for N -body and population synthesis codes

Stars and planetary system

LHS 1815b: The First Thick-disk Planet Detected by TESS

We report the first discovery of a thick-disk planet, LHS 1815b (TOI-704b, TIC 260004324), detected in the Transiting Exoplanet Survey Satellite (TESS) survey. LHS 1815b transits a bright (V = 12.19 mag, K = 7.99 mag) and quiet M dwarf located 29.87 ± 0.02 pc away with a mass of 0.502 ± 0.015 M o˙ and a radius of 0.501 ± 0.030 R o˙. We validate the planet by combining space- and ground-based photometry, spectroscopy, and imaging. The planet has a radius of 1.088 ± 0.064 R ⊕ with a 3σ mass upper limit of 8.7 M ⊕. We analyze the galactic kinematics and orbit of the host star LHS 1815 and find that it has a large probability (P thick/P thin = 6482) to be in the thick disk with a much higher expected maximal height (Z max = 1.8 kpc) above the Galactic plane compared with other TESS planet host stars. Future studies of the interior structure and atmospheric properties of planets in such systems using, for example, the upcoming James Webb Space Telescope, can investigate the differences in formation efficiency and evolution for planetary systems between different Galactic components (thick disks, thin disks, and halo)

Revisiting the common envelope evolution in binary stars: a new semianalytic model for N -body and population synthesis codes

Stars and planetary system

Avaliação do número e posição de frutos de melancia produzidos em ambiente protegido Evaluation of the number and position of watermelon fruits cultivated in a greenhouse

Estudou-se a produção de melancia, cultivar New Kodama, avaliando 1 ou 2 frutos por planta fixados nos ramos entre o 8º e 11º nó e 1 ou 2 frutos por planta fixados nos ramos entre o 13º e 16º nó, no sistema tutorado em ambiente protegido. O experimento foi conduzido na UNESP, em Botucatu (SP), de outubro a dezembro de 2000. Avaliou-se a produção total de frutos por planta, peso médio de frutos e teor em sólidos solúveis totais (ºbrix). A produção foi menor (2,04 kg/planta) quando manteve-se apenas um fruto fixado do 8º ao 11º nó, do que quando manteve-se dois frutos (2,57 kg/planta), mas não houve diferença significativa quando manteve-se um ou dois frutos fixados do 13º ao 16º nó, produzindo cerca de 2 kg por planta. Observou-se também maior peso médio de frutos (2,05 kg/fruto) e maior teor de sólidos solúveis totais (8,78ºbrix) quando mantidos apenas um fruto por planta e maior teor de sólidos solúveis totais (8,21ºbrix) nos frutos mantidos do 8º ao 11º nó.<br>The fruit production of watermelon, cultivar New Kodama, grown in two positions along the stem (8th-11th node and 13th-16th node), with one or two fruits per position was evaluated, under protected cultivation. The experiment was performed in Botucatu, São Paulo State, Brazil, from October to December, 2000. The total fruit production (kg/plant), the average fruit weight (kg/fruit) and the total soluble solids were evaluated. When only one fruit was allowed to grow between the 8th and 11th node, total fruit production was lower (2,04 kg/plant) than keeping two fruits (2,57 kg/fruit). However, the fruit production was similar (2,0 kg/plant) to one or two fruits when they were allowed to grow between the 13th and 16th node. The average fruit weight (2,05 kg/fruit) and total soluble solids (8,78ºbrix) were higher in fruits grown from plants with only one fruit, than two fruits per plant. Total soluble solids were also higher in fruits grown from 8th to 11th (8,21ºbrix) node position