Navegação Ciências Exatas e da Terra por Assunto "Planetary systems"

Resultados 1-4 de 4

    • Limits on planets around pulsating white dwarf stars 

      Mullally, Fergal; Winget, Donald Earl; DeGennaro, Steven; Jeffery, Elizabeth; Thompson, S. E.; Chandler, Dean W.; Kepler, Souza Oliveira (2008) [Artigo de periódico]
      We present limits on planetary companions to pulsating white dwarf stars. A subset of these stars exhibit extreme stability in the period and phase of some of their pulsation modes; a planet can be detected around such a ...

    • The Li–age correlation: the Sun is unusually Li deficient for its age 

      Carlos, Marília Gabriela Cardoso Corrêa; Meléndez, Jorge; Spina, Lorenzo; Santos, Leonardo Augusto Gonçalves dos; Bedell, Megan; Ramírez, Iván; Asplund, Martin; Bean, Jacob L.; Yong, David; Galarza, Jhon Joel Yana; Alves-Brito, Alan (2019) [Artigo de periódico]
      This work aims to examine in detail the depletion of lithium in solar twins to better constrain stellar evolution models and investigate its possible connection with exoplanets. We employ spectral synthesis in the region ...

    • The solar twin planet search I. Fundamental parameters of the stellar sample 

      Ramírez, Iván; Meléndez, Jorge; Bean, Jacob L.; Asplund, Martin; Bedell, Megan; Monroe, TalaWanda Rose; Casagrande, Luca; Schirbel, Lucas Alexandre; Dreizler, Stefan; Teske, Johanna K.; Maia, Marcelo Tucci; Alves-Brito, Alan; Baumann, P. (2014) [Artigo de periódico]
      Context. We are carrying out a search for planets around a sample of solar twin stars using the HARPS spectrograph. The goal of this project is to exploit the advantage offered by solar twins to obtain chemical abundances ...

    • The solar twin planet search : V. close-in, low-mass planet candidates and evidence of planet accretion in the solar twin HIP 68468 

      Meléndez, Jorge; Bedell, Megan; Bean, Jacob L.; Ramírez, Iván; Asplund, Martin; Dreizler, Stefan; Yan, Hong Liang; Shi, Jianrong; Lind, Karin; Ferraz-Mello, Sylvio; Galarza, Jhon Joel Yana; Santos, Leonardo Augusto Gonçalves dos; Spina, Lorenzo; Maia, Marcelo Tucci; Alves-Brito, Alan; Monroe, TalaWanda Rose; Casagrande, Luca (2017) [Artigo de periódico]
      Context. More than two thousand exoplanets have been discovered to date. Of these, only a small fraction have been detected around solar twins, which are key stars because we can obtain accurate elemental abundances ...