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First spectroscopic investigation of a microlensing event: what's going wrong?

Isabelle Boisse
Laboratoire d'Astrophysique de Marseille

We attempted a pioneer radial velocity and spectroscopic follow-up of the bright (V~18) microlensing event OGLE-2011-BLG-0417 for which the lens was predicted to be a pair of M dwarfs. Our radial velocity data, obtained with the UVES spectrograph at the ESO-VLT, exhibit no variation with a RMS at the level of 100m/s. This is significantly lower than the predicted ~6km/s variation for the eccentric binary. Moreover, we also derived, for the first time, the spectroscopic parameters of the lens which turns out to be a G dwarf. Both spectroscopic investigation of this system show the difficulties to interpret microlensing events and the needs for follow-up observations.

Cookie seminar co-presented by Alexandre Santerne (IA)

2015 December 17, 13:30

Centro de Astrofísica da Universidade do Porto (Classroom)
Rua das Estrelas, 4150-762 Porto

Faculdade de Ciências da Universidade de Lisboa Universidade do Porto Faculdade de Ciências e Tecnologia da Universidade de Coimbra
Fundação para a Ciência e a Tecnologia COMPETE 2020 PORTUGAL 2020 União Europeia