We present the results of a monitoring campaign of the Paschen β emission lines (1.28µm) of two accreting 10-30M Jup companions with the VLT/SINFONI integral field spectrograph : GQ Lup b and GSC 06214-00210 b. We evidence variability of line intensities and profiles on minutes to years timescales on both objects. These behaviors are reminiscent of rotation-modulated variability observed on CTTS and a signpost of magnetospheric accretion. The line properties are compared to predictions from a scaled-down version of the stellar magnetospheric accretion (MA) models and to the latest disk-driven accretion models of protoplanets nested within circumstellar disks. The line properties of GQ Lup b are reproduced by MA models while those of GSC 06214-00210 b are better fitted by disk-driven accretion models (protoplanets). New MA models with inclined dipoles and monitoring observations at higher spectral resolving powers over one rotation period (1h to several days) could help confirming the mechanisms at play on these two objects. We discuss the implication of our findings for the protoplanet detection based on their line emission (e.g., VLT/MUSE, Magelan/MagAO-X).

{"references": ["Aoyama, Y., Ikoma, M., & Tanigawa, T. 2018, ApJ, 866, 84", "Thanathibodee, T., Calvet, N., Bae, J., Muzerolle, J., & Hern\u00e1ndez, R. F. 2019, ApJ, 885, 94"]}