Kinematic structures found with Gaia DR1/TGAS and RAVE in the Solar neighbourhood

TL;DR

This study uses Gaia DR1 TGAS and RAVE data to identify 19 stellar kinematic structures in the Solar neighbourhood, including known and new groups, revealing a more complex velocity distribution than previously known.

Contribution

It introduces a wavelet analysis approach to detect multiple kinematic structures in a large stellar sample, including new groups not previously identified.

Findings

Detected 19 kinematic structures at 3-sigma confidence

Confirmed known stellar groups such as Hercules and Sirius

Reported a new kinematic structure at (U,V)=(37, 8) km/s

Abstract

With the much enlarged stellar sample of 55831 stars and much increased precision in distances, proper motions, provided by Gaia DR1 TGAS we have shown with the help of the wavelet analysis that the velocity distribution of stars in the Solar neighbourhood contains more kinematic structures than previously known. We detect 19 kinematic structures between scales 3-16 km/s at the 3sigma confidence level. Among them we identified well-known groups (such as Hercules, Sirius, Coma Berenices, Pleiades, and Wolf 630). We confirmed recently detected groups (such as Antoja12 and Bobylev16). In addition we report here about a new kinematic structure at (U,V)=(37, 8) km/s. Another three new groups are tentatively detected, but require confirmation.