The Solar Twin Planet Search - V. Close-in, low-mass planet candidates and evidence of planet accretion in the solar twin HIP 68468 - Moreno, Jorge Luiz Meléndez; Bedell, Megan; Bean, Jacob L; Mello, Sylvio Ferras; Galarza, Jhon Yana; Santos, Leonardo dos; Spina, Lorenzo; Maia, Marcelo Tucci (Astronomy and Astrophysysics, 2017)