New binaries from the SHINE survey

نویسندگان

چکیده

We present the multiple stellar systems observed within SpHere INfrared survey for Exoplanet (SHINE). SHINE searched substellar companions to young stars using high contrast imaging. Although with known SPHERE field of view (<5.5 arcsec) were removed from original target list, we detected additional 78 463 targets so far. 27% have three or more components. Given heterogeneity sample in terms observing conditions and strategy, tailored routines used data reduction analysis, some which specifically designed these sets. then combined literature archival ones, TESS light curves Gaia parallaxes proper motions, characterise as completely possible. Combining all data, able constrain orbits 25 systems. carefully assessed completeness our separation range 50-500 mas (period a few years - tens years), taking into account initial selection biases recovering part excluded list due their multiplicity. This allowed us compare binary frequency previous studies highlight interesting trends mass ratio period distribution. also found that, objects such estimate was possible, values masses derived dynamical arguments good agreement model predictions. Stellar orbital spins appear fairly well aligned 12 having enough favour disk fragmentation origin. Our results importance combining different techniques when tackling complex problems formation binaries show how large samples can be useful than one purpose.

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ژورنال

عنوان ژورنال: Astronomy and Astrophysics

سال: 2022

ISSN: ['0004-6361', '1432-0746']

DOI: https://doi.org/10.1051/0004-6361/202140510