CFHT UM2025 - Presentation Details
Abstract Details
Title: SPIRou velocimetry and magnetism of the class I protostar V347 Aur
Presenter: Evelyne Alecian
Abstract:
V347 Aur is a low-mass very young (<1 Myr) protostar that has recently been studied intensively for two reasons: its periodic photometric bursts, and its magnetic field. Dahm & Hillenbrand (2020) have analysed photometric time-series obtained over several years, report regular bursts with a period of about 155 d, and conclude that these bursts are most likely accretion bursts from the protoplanetary disk. At the same time Flores et al. (2019) analysed near-IR spectroscopic lines that are highly sensitive to the magnetic field, and report the presence of a total magnetic field intensity of about 1.3 kG, through the Zeeman broadening technique. Because the large-scale magnetic fields in protostars have (i) unknown properties, and (ii) are expected to play a decisive role in the star-disk interaction, and angular regulation at the protostellar age, we have conducted a dense monitoring of this object with SPIRou within the SLS and SPICE LPs. We obtained 83 observations of V347 Aur over more than 3 years. We have applied several state-of-the-art techniques of radial velocity measurements on the dataset, as well as the ZDI technique to map its magnetic field. In this poster, we will present the results of our analysis, how they can help to understand the periodic bursts observed in photometry, and how our velocimetry results affect the magnetic field mapping.