Asensio-Torres, RubenRubenAsensio-TorresCurrie, ThayneThayneCurrieJanson, MarkusMarkusJansonDESIDERA, SilvanoSilvanoDESIDERAKuzuhara, MasayukiMasayukiKuzuharaHodapp, KlausKlausHodappBrandt, Timothy D.Timothy D.BrandtGuyon, OlivierOlivierGuyonLozi, JulienJulienLoziGroff, TylerTylerGroffKasdin, JeremyJeremyKasdinChilcote, JeffreyJeffreyChilcoteJovanovic, NemanjaNemanjaJovanovicMartinache, FrantzFrantzMartinacheSitko, MichaelMichaelSitkoSerabyn, EugeneEugeneSerabynWagner, KevinKevinWagnerAkiyama, EijiEijiAkiyamaKwon, JungmiJungmiKwonUyama, TaichiTaichiUyamaYang, YiYiYangNakagawa, TakaoTakaoNakagawaHayashi, MasahikoMasahikoHayashiMcElwain, MichaelMichaelMcElwainKudo, TomoyukiTomoyukiKudoHenning, ThomasThomasHenningTamura, MotohideMotohideTamura2021-01-042021-01-0420190004-6361http://hdl.handle.net/20.500.12386/29410We present SCExAO/CHARIS 1.1-2.4 μm integral field direct spectroscopy of the young HIP 79124 triple system. HIP 79124 is a member of the Scorpius-Centaurus association, consisting of an A0V primary with two low-mass companions at a projected separation of < 1″. Thanks to the high quality wavefront corrections provided by SCExAO, both companions are decisively detected without the employment of any PSF-subtraction algorithm to eliminate quasi-static noise. The spectrum of the outer C object is very well matched by Upper Scorpius M4 ± 0.5 standard spectra, with a T<SUB>eff</SUB> = 2945 ± 100 K and a mass of ∼350 M<SUB>Jup</SUB>. HIP 79124 B is detected at a separation of only 180 mas in a highly-correlated noise regime, and it falls in the spectral range M6 ± 0.5 with T<SUB>eff</SUB> = 2840 ± 190 K and ∼100 M<SUB>Jup</SUB>. Previous studies of stellar populations in Sco-Cen have highlighted a discrepancy in isochronal ages between the lower-mass and higher-mass populations. This could be explained either by an age spread in the region, or by conventional isochronal models failing to reproduce the evolution of low-mass stars. The HIP 79124 system should be coeval, and therefore it provides an ideal laboratory to test these scenarios. We place the three components in a color-magnitude diagram and find that the models predict a younger age for the two low-mass companions (∼3 Myr) than for the primary star (∼6 Myr). These results imply that the omission of magnetic effects in conventional isochronal models inhibit them from reproducing early low-mass stellar evolution, which is further supported by the fact that new models that include such effects provide more consistent ages in the HIP 79124 system.STAMPAenArticle10.1051/0004-6361/2018346882-s2.0-85060887361000456679300005https://www.aanda.org/articles/aa/full_html/2019/02/aa34688-18/aa34688-18.html2019A&A...622A..42AFIS/05 - ASTRONOMIA E ASTROFISICAERC sectors::Physical Sciences and Engineering::PE9 Universe sciences: astro-physics/chemistry/biology; solar systems; stellar, galactic and extragalactic astronomy, planetary systems, cosmology, space science, instrumentation